Materials and Catalysts for Pollutants and CO2 Capture and Transformation

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Catalysts catalysts	3.8	6.8	2011	13.9 Days	CHF 2200
ChemEngineering ChemEngineering	2.8	4.0	2017	32.8 Days	CHF 1600
Energies energies	3.0	6.2	2008	16.8 Days	CHF 2600
Materials materials	3.1	5.8	2008	13.9 Days	CHF 2600
Nanomaterials nanomaterials	4.4	8.5	2010	14.1 Days	CHF 2400

15 pages, 4565 KiB

Open AccessArticle

Synthesizing and Characterizing a Mesoporous Silica Adsorbent for Post-Combustion CO₂ Capture in a Fixed-Bed System

by Hind F. Hasan, Farah T. Al-Sudani, Talib M. Albayati, Issam K. Salih, Hamed N. Harharah, Hasan Sh. Majdi, Noori M. Cata Saady, Sohrab Zendehboudi and Abdelfattah Amari

Catalysts 2023, 13(9), 1267; https://doi.org/10.3390/catal13091267 - 2 Sep 2023

Cited by 6 | Viewed by 2063 | Correction

Abstract

MCM-41, a mesoporous silica with a high surface area and hexagonal structure, was synthesized, and commercial nano-silicon dioxide (SiO₂) was used as a solid adsorbed in post-combustion CO₂ capture. The CO₂ adsorption experiments were conducted in a fixed-bed adsorption [...] Read more.

MCM-41, a mesoporous silica with a high surface area and hexagonal structure, was synthesized, and commercial nano-silicon dioxide (SiO₂) was used as a solid adsorbed in post-combustion CO₂ capture. The CO₂ adsorption experiments were conducted in a fixed-bed adsorption system using 5–15 vol.% CO₂/N₂ at a flow rate of 100 mL/min at varying temperatures (20–80 °C) and atmospheric pressure. Analyses (X-ray diffraction, nitrogen adsorption-desorption isotherms, Fourier-transform infrared spectroscopy, and transmission electron microscopy (TEM)) revealed that the synthesized MCM-41 has mesoporous characteristics: a high surface area and large pore volumes. The CO₂ adsorption capacity of MCM-41 and commercial nano-SiO₂ increased considerably with increasing CO₂ concentration and temperature, peaking at 60 °C. Below 60 °C, dynamics rather than thermodynamics governed the adsorption. Increasing the temperature from 60 to 80 °C decreased the adsorption capacity, and the reaction became thermodynamically dominant. Additionally, compared with commercial nano-SiO₂, the MCM-41 sorbent demonstrated superior regenerability and thermal stability. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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23 pages, 4518 KiB

Open AccessArticle

Enhancement of Photocatalytic Activity and Microstructural Growth of Cobalt-Substituted Ba_1−xCo_xTiO₃ {x = 0, …, 1} Heterostructure

by Sana Jebali, Mahdi Meftah, Chadha Mejri, Abdesslem Ben Haj Amara and Walid Oueslati

ChemEngineering 2023, 7(3), 43; https://doi.org/10.3390/chemengineering7030043 - 1 May 2023

Cited by 4 | Viewed by 3340

Abstract

The photocatalytic degradation process and absorption kinetics of the aqueous solution of the Cibacron Brilliant Yellow 3G-P dye (Y) were investigated under UV-Vis light. Pure barium titanate BaTiO₃ (BT) and cobalt ion-substituted barium Ba_1−xCo_xTiO₃ (x = 0, [...] Read more.

The photocatalytic degradation process and absorption kinetics of the aqueous solution of the Cibacron Brilliant Yellow 3G-P dye (Y) were investigated under UV-Vis light. Pure barium titanate BaTiO₃ (BT) and cobalt ion-substituted barium Ba_1−xCo_xTiO₃ (x = 0, …, 1) nano-compound powders (BCT) were synthesized using the sol–gel method and colloidal solution destabilization, and utilized as photocatalysts. The powder X-ray diffraction (PXRD) crystal structure analysis of the BT nanoparticles (NPs) revealed a prominent reflection corresponding to the perovskite structure. However, impurities and secondary phase distributions were qualitatively identified in the PXRD patterns for x ≥ 0.2 of cobalt substitution rate. Rietveld refinements of the PXRD data showed that the BCT nano-compound series undergoes a transition from perovskite structure to isomorphous ilmenite-type rhombohedral CoTiO₃ (CT) ceramic. The nanoparticles produced displayed robust chemical interactions, according to a Fourier transform infrared spectroscopy (FTIR) analysis. The BT and BCT nanoparticles had secondary hexagonal phases that matched the PXRD results and small aggregated, more spherically shaped particles with sizes ranging from 30 to 114 nm, according to transmission electron microscopy (TEM). Following a thorough evaluation of BCT nano-compounds with (x = 0.6), energy-dispersive X-ray (EDX) compositional elemental analysis revealed random distributions of cobalt ions. Through optical analysis of the photoluminescence spectra (PL), the electronic structure, charge carriers, defects, and energy transfer mechanisms of the compounds were examined. Due to the cobalt ions being present in the BT lattice, the UV-visible absorption spectra of BCT showed a little red-shift in the absorption curves when compared to pure BT samples. The electrical and optical characteristics of materials, such as their photon absorption coefficient, can be gathered from their UV-visible spectra. The photocatalytic reaction is brought about by the electron–hole pairs produced by this absorption. The estimated band gap energies of the examined compounds, which are in the range of 3.79 to 2.89 eV, are intriguing and require more investigation into their potential as UV photocatalysts. These nano-ceramics might be able to handle issues with pollution and impurities, such as the breakdown of organic contaminants and the production of hydrogen from water. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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25 pages, 3973 KiB

Open AccessFeature PaperArticle

CO₂ Methanation over Nickel Catalysts: Support Effects Investigated through Specific Activity and Operando IR Spectroscopy Measurements

by Vigni V. González-Rangulan, Inés Reyero, Fernando Bimbela, Francisca Romero-Sarria, Marco Daturi and Luis M. Gandía

Catalysts 2023, 13(2), 448; https://doi.org/10.3390/catal13020448 - 20 Feb 2023

Cited by 26 | Viewed by 5490

Abstract

Renewed interest in CO₂ methanation is due to its role within the framework of the Power-to-Methane processes. While the use of nickel-based catalysts for CO₂ methanation is well stablished, the support is being subjected to thorough research due to its complex [...] Read more.

Renewed interest in CO₂ methanation is due to its role within the framework of the Power-to-Methane processes. While the use of nickel-based catalysts for CO₂ methanation is well stablished, the support is being subjected to thorough research due to its complex effects. The objective of this work was the study of the influence of the support with a series of catalysts supported on alumina, ceria, ceria–zirconia, and titania. Catalysts’ performance has been kinetically and spectroscopically evaluated over a wide range of temperatures (150–500 °C). The main results have shown remarkable differences among the catalysts as concerns Ni dispersion, metallic precursor reducibility, basic properties, and catalytic activity. Operando infrared spectroscopy measurements have evidenced the presence of almost the same type of adsorbed species during the course of the reaction, but with different relative intensities. The results indicate that using as support of Ni a reducible metal oxide that is capable of developing the basicity associated with medium-strength basic sites and a suitable balance between metallic sites and centers linked to the support leads to high CO₂ methanation activity. In addition, the results obtained by operando FTIR spectroscopy suggest that CO₂ methanation follows the formate pathway over the catalysts under consideration. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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13 pages, 5148 KiB

Open AccessArticle

Carbon Fibers Prepared via Solution Plasma-Generated Seeds

by Andres Eduardo Romero Valenzuela, Chayanaphat Chokradjaroen, Pongpol Choeichom, Xiaoyang Wang, Kyusung Kim and Nagahiro Saito

Materials 2023, 16(3), 906; https://doi.org/10.3390/ma16030906 - 17 Jan 2023

Cited by 3 | Viewed by 2593

Abstract

Carbon fibers are materials with potential applications for CO₂ capture due to their porous structure and high surface areas. Nevertheless, controlling their porosity at a microscale remains challenging. The solution plasma (SP) process provides a fast synthesis route for carbon materials when [...] Read more.

Carbon fibers are materials with potential applications for CO₂ capture due to their porous structure and high surface areas. Nevertheless, controlling their porosity at a microscale remains challenging. The solution plasma (SP) process provides a fast synthesis route for carbon materials when organic precursors are used. During the discharge and formation of carbon materials in solution, a soot product-denominated solution plasma-generated seeds (SPGS) is simultaneously produced at room temperature and atmospheric pressure. Here, we propose a preparation method for carbon fibers with different and distinctive morphologies. The control over the morphology is also demonstrated by the use of different formulations. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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13 pages, 4021 KiB

Open AccessArticle

Forced Mineral Carbonation of MgO Nanoparticles Synthesized by Aerosol Methods at Room Temperature

by Kyungil Cho, Yeryeong Kang, Sukbyung Chae and Changhyuk Kim

Nanomaterials 2023, 13(2), 281; https://doi.org/10.3390/nano13020281 - 9 Jan 2023

Cited by 1 | Viewed by 2273

Abstract

Magnesium oxide (MgO) has been investigated as a wet mineral carbonation adsorbent due to its relatively low adsorption and regeneration temperatures. The carbon dioxide (CO₂) capture efficiency can be enhanced by applying external force on the MgO slurry during wet carbonation. [...] Read more.

Magnesium oxide (MgO) has been investigated as a wet mineral carbonation adsorbent due to its relatively low adsorption and regeneration temperatures. The carbon dioxide (CO₂) capture efficiency can be enhanced by applying external force on the MgO slurry during wet carbonation. In this study, two aerosol-processed MgO nanoparticles were tested with a commercial MgO one to investigate the external force effect on the wet carbonation performance at room temperature. The MgO nano-adsorbents were carbonated and sampled every 2 h up to 12 h through forced and non-forced wet carbonations. Hydrated magnesium carbonates (nesquehonite, artinite and hydromagnesite) were formed with magnesite through both wet carbonations. The analyzed results for the time-dependent chemical compositions and physical shapes of the carbonation products consistently showed the enhancement of wet carbonation by the external force, which was at least 4 h faster than the non-forced carbonation. In addition, the CO₂ adsorption was enhanced by the forced carbonation, resulting in a higher amount of CO₂ being adsorbed by MgO nanoparticles than the non-forced carbonation, unless the carbonation processes were completed. The adsorbed amount of CO₂ was between the maximum theoretical amounts of CO₂ adsorbed by nesquehonite and hydromagnesite. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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22 pages, 11136 KiB

Open AccessArticle

Low Overpotential Electrochemical Reduction of CO₂ to Ethanol Enabled by Cu/Cu_xO Nanoparticles Embedded in Nitrogen-Doped Carbon Cuboids

by Monther Q. Alkoshab, Eleni Thomou, Ismail Abdulazeez, Munzir H. Suliman, Konstantinos Spyrou, Wissam Iali, Khalid Alhooshani and Turki N. Baroud

Nanomaterials 2023, 13(2), 230; https://doi.org/10.3390/nano13020230 - 4 Jan 2023

Cited by 4 | Viewed by 2936

Abstract

The electrochemical conversion of CO₂ into value-added chemicals is a promising approach for addressing environmental and energy supply problems. In this study, electrochemical CO₂ catalysis to ethanol is achieved using incorporated Cu/Cu_xO nanoparticles into nitrogenous porous carbon cuboids. Pyrolysis [...] Read more.

The electrochemical conversion of CO₂ into value-added chemicals is a promising approach for addressing environmental and energy supply problems. In this study, electrochemical CO₂ catalysis to ethanol is achieved using incorporated Cu/Cu_xO nanoparticles into nitrogenous porous carbon cuboids. Pyrolysis of the coordinated Cu cations with nitrogen heterocycles allowed Cu nanoparticles to detach from the coordination complex but remain dispersed throughout the porous carbon cuboids. The heterogeneous composite Cu/Cu_xO-PCC-0h electrocatalyst reduced CO₂ to ethanol at low overpotential in 0.5 M KHCO₃, exhibiting maximum ethanol faradaic efficiency of 50% at −0.5 V vs. reversible hydrogen electrode. Such electrochemical performance can be ascribed to the synergy between pyridinic nitrogen species, Cu/Cu_xO nanoparticles, and porous carbon morphology, together providing efficient CO₂ diffusion, activation, and intermediates stabilization. This was supported by the notably high electrochemically active surface area, rich porosity, and efficient charge transfer properties. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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18 pages, 10307 KiB

Open AccessReview

Research Progress in High-Throughput Screening of CO₂ Reduction Catalysts

by Qinglin Wu, Meidie Pan, Shikai Zhang, Dongpeng Sun, Yang Yang, Dong Chen, David A. Weitz and Xiang Gao

Energies 2022, 15(18), 6666; https://doi.org/10.3390/en15186666 - 13 Sep 2022

Cited by 18 | Viewed by 4216

Abstract

The conversion and utilization of carbon dioxide (CO₂) have dual significance for reducing carbon emissions and solving energy demand. Catalytic reduction of CO₂ is a promising way to convert and utilize CO₂. However, high-performance catalysts with excellent catalytic [...] Read more.

The conversion and utilization of carbon dioxide (CO₂) have dual significance for reducing carbon emissions and solving energy demand. Catalytic reduction of CO₂ is a promising way to convert and utilize CO₂. However, high-performance catalysts with excellent catalytic activity, selectivity and stability are currently lacking. High-throughput methods offer an effective way to screen high-performance CO₂ reduction catalysts. Here, recent advances in high-throughput screening of electrocatalysts for CO₂ reduction are reviewed. First, the mechanism of CO₂ reduction reaction by electrocatalysis and potential catalyst candidates are introduced. Second, high-throughput computational methods developed to accelerate catalyst screening are presented, such as density functional theory and machine learning. Then, high-throughput experimental methods are outlined, including experimental design, high-throughput synthesis, in situ characterization and high-throughput testing. Finally, future directions of high-throughput screening of CO₂ reduction electrocatalysts are outlooked. This review will be a valuable reference for future research on high-throughput screening of CO₂ electrocatalysts. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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11 pages, 2255 KiB

Open AccessArticle

Photo-Regeneration of Zeolite-Based Volatile Organic Compound Filters Enabled by TiO₂ Photocatalyst

by Taegyu Kim, Kunsang Yoo, Myung-Gil Kim and Yong-Hoon Kim

Nanomaterials 2022, 12(17), 2959; https://doi.org/10.3390/nano12172959 - 26 Aug 2022

Cited by 7 | Viewed by 2355

Abstract

Indoor air filtration received significant attention owing to the growing threat to the environment and human health caused by air pollutants such as volatile organic compound (VOC) gases. However, owing to the limited adsorption capacity of VOC adsorbents, such as activated carbon, a [...] Read more.

Indoor air filtration received significant attention owing to the growing threat to the environment and human health caused by air pollutants such as volatile organic compound (VOC) gases. However, owing to the limited adsorption capacity of VOC adsorbents, such as activated carbon, a rapid breakthrough can occur, reducing the service life of the filter. Therefore, TiO₂-coated zeolite (TiO₂/zeolite) was utilized as a photo-regenerative VOC adsorbent to increase the service life of VOC filters. In particular, with photoactive TiO₂ forms on zeolite, efficient and repetitive photo-regeneration is attainable through the dissociation of VOC molecules by the photocatalytic reaction. We optimized the TiO₂ coating amount to obtain TiO₂/zeolite particles with a high surface area (BET surface area > 500 m²/g) and high adsorption capacity. A VOC filter with an adsorption efficiency of 72.1% for formaldehyde was realized using TiO₂/zeolite as the adsorbent. Furthermore, the TiO₂/zeolite filter exhibits a photo-regeneration efficiency of >90% for the initial two regeneration cycles using ultraviolet illumination, and >60% up to five cycles. Based on these observations, we consider that TiO₂/zeolite is a potential adsorbent candidate for photo-regenerative VOC filters. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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11 pages, 3183 KiB

Open AccessArticle

Formic Acid Generation from CO₂ Reduction by MOF-253 Coordinated Transition Metal Complexes: A Computational Chemistry Perspective

by Meng-Chi Hsieh, Ranganathan Krishnan and Ming-Kang Tsai

Catalysts 2022, 12(8), 890; https://doi.org/10.3390/catal12080890 - 12 Aug 2022

Cited by 4 | Viewed by 3241

Abstract

The inclusion of transition metal elements within metal–organic frameworks (MOFs) is considered one of the most promising approaches for enhancing the catalytic capability of MOFs. In this study, MOF-253 containing bipyridine coordination sites is investigated for possible transition metal chelation, and a consequent [...] Read more.

The inclusion of transition metal elements within metal–organic frameworks (MOFs) is considered one of the most promising approaches for enhancing the catalytic capability of MOFs. In this study, MOF-253 containing bipyridine coordination sites is investigated for possible transition metal chelation, and a consequent possible CO₂ reduction mechanism in the formation of formic acid. All transition metal elements of the third, fourth and fifth periods except hafnium and the lanthanide series are considered using density functional theory calculations. Two distinct types of CO₂ reduction mechanisms are identified: (1) the five-coordination Pd center, which promotes formic acid generation via an intramolecular proton transfer pathway; (2) several four-coordination metal centers, including Mn, Pd, and Pt, which generate formic acid by means of heterolytic hydrogen activation. The MOF-253 environment is found to promote beneficial steric hindrance, and to constrain metal–ligand orientation, which consequently facilitates the formation of formic acid, particularly with the tetrahedral Mn center at high-spin electronic state. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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10 pages, 5949 KiB

Open AccessArticle

Efficient Photothermal Elimination of Formaldehyde under Visible Light at Room Temperature by a MnO_x-Modified Multi-Porous Carbon Sphere

by Wanpeng Liu, Liu Shi, Rongyang Yin, Pengfei Sun, Jinming Ren and Yongming Wang

Materials 2022, 15(13), 4484; https://doi.org/10.3390/ma15134484 - 25 Jun 2022

Cited by 8 | Viewed by 2007

Abstract

Volatile organic compounds (VOCs) exert a serious impact on the environment and human health. The development of new technologies for the elimination of VOCs, especially those from non-industrial emission sources, such as indoor air pollution and other low-concentration VOCs exhaust gases, is essential [...] Read more.

Volatile organic compounds (VOCs) exert a serious impact on the environment and human health. The development of new technologies for the elimination of VOCs, especially those from non-industrial emission sources, such as indoor air pollution and other low-concentration VOCs exhaust gases, is essential for improving environmental quality and human health. In this study, a monolithic photothermocatalyst was prepared by stabilizing manganese oxide on multi-porous carbon spheres to facilitate the elimination of formaldehyde (HCHO). This catalyst exhibited excellent photothermal synergistic performance. Therefore, by harvesting only visible light, the catalyst could spontaneously heat up its surface to achieve a thermal catalytic oxidation state suitable for eliminating HCHO. We found that the surface temperature of the catalyst could reach to up 93.8 °C under visible light, achieving an 87.5% HCHO removal efficiency when the initial concentration of HCHO was 160 ppm. The microporous structure on the surface of the carbon spheres not only increased the specific surface area and loading capacity of manganese oxide but also increased their photothermal efficiency, allowing them to reach a temperature high enough for MnO_x to overcome the activation energy required for HCHO oxidation. The relevant catalyst characteristics were analyzed using XRD, measurement of BET surface area, scanning electron microscopy, HR-TEM, XPS, and DRS. Results obtained from a cyclic performance test indicated high stability and potential application of the MnO_x-modified multi-porous carbon sphere. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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17 pages, 33373 KiB

Open AccessArticle

Mechanistic and Experimental Study of the Cu_xO@C Nanocomposite Derived from Cu₃(BTC)₂ for SO₂ Removal

by Rudi Duan, Weibin Chen, Ziwei Chen, Jialiang Gu, Zhaoqi Dong, Beini He, Lili Liu and Xidong Wang

Catalysts 2022, 12(7), 689; https://doi.org/10.3390/catal12070689 - 24 Jun 2022

Cited by 2 | Viewed by 2432

Abstract

A tunable and efficient strategy was adopted to synthesize highly porous nano-structured CuO−carbonized composites (Cu_xO@C) using Cu₃(BTC)₂ as a sacrificial template. The as-synthesized CuO nanocomposites exhibited hollow octahedral structures, a large surface area (89.837 m² g⁻¹ [...] Read more.

A tunable and efficient strategy was adopted to synthesize highly porous nano-structured CuO−carbonized composites (Cu_xO@C) using Cu₃(BTC)₂ as a sacrificial template. The as-synthesized CuO nanocomposites exhibited hollow octahedral structures, a large surface area (89.837 m² g⁻¹) and a high proportion of Cu₂O active sites distributed on a carbon frame. Based on DFT calculations, both the Cu atoms on the surface (Cu_S) and oxygen vacancy (O_V) exhibited strong chemical reactivity. On the perfect CuO (111), the Cu_S transferred charge to O atoms on the surface and SO₂ molecules. A strong adsorption energy (−1.41 eV) indicated the existence of the chemisorption process. On the oxygen-deficient CuO (111), the O₂ preferably adsorbed on O_V and then formed SO₃ by bonding with SO₂, followed by the cleavage of the O−O bond. Furthermore, the CuO nanocomposites exhibited an excellent ratio of S/Cu in SO₂ removal experiments compared with CuO nanoparticles produced by coprecipitation. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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18 pages, 11057 KiB

Open AccessArticle

One-Pot Synthesis of Rubber Seed Shell-Derived N-Doped Ultramicroporous Carbons for Efficient CO₂ Adsorption

by Xiaoxia Zhang, Meng Rong, Hui Cao and Tianwei Tan

Nanomaterials 2022, 12(11), 1889; https://doi.org/10.3390/nano12111889 - 31 May 2022

Cited by 5 | Viewed by 2504

Abstract

In this work, a series of novel rubber seed shell-derived N-doped ultramicroporous carbons (NPCs) were prepared by one-step high-temperature activation (500–1000 °C), using melamine as the nitrogen source and KOH as the activator. The effects of the melamine dosage and the activation temperatures [...] Read more.

In this work, a series of novel rubber seed shell-derived N-doped ultramicroporous carbons (NPCs) were prepared by one-step high-temperature activation (500–1000 °C), using melamine as the nitrogen source and KOH as the activator. The effects of the melamine dosage and the activation temperatures on the surface chemical properties (doped N contents and N species), textural properties (surface area, pore structure, and microporosity), CO₂ adsorption capacities, and CO₂/N₂ selectivity were thoroughly investigated and characterized. These as-prepared NPCs demonstrate controllable BET surface areas (398–2163 m²/g), ultramicroporosity, and doped nitrogen contents (0.82–7.52 wt%). It was found that the ultramicroporosity and the doped nitrogens significantly affected the CO₂ adsorption and the separation performance at low pressure. Among the NPCs, highly microporous NPC-600-4 demonstrates the largest CO₂ adsorption capacity of 5.81 mmol/g (273 K, 1.0 bar) and 3.82 mmol/g (298 K, 1.0 bar), as well as a high CO₂/N₂ selectivity of 36.6, surpassing a lot of reported biomass-based porous carbons. In addition, NPC-600-4 also shows excellent thermal stability and recycle performance, indicating the competitive application potential in practical CO₂ capture. This work also presents a facile one-pot synthesis method to prepare high-performance biomass-based NPCs. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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14 pages, 14544 KiB

Open AccessArticle

Silver Nanoparticle-Intercalated Cotton Fiber for Catalytic Degradation of Aqueous Organic Dyes for Water Pollution Mitigation

by Matthew Blake Hillyer, Jacobs H. Jordan, Sunghyun Nam, Michael W. Easson and Brian D. Condon

Nanomaterials 2022, 12(10), 1621; https://doi.org/10.3390/nano12101621 - 10 May 2022

Cited by 11 | Viewed by 2882

Abstract

Azo dyes are commonly used in textile color processing for their wide array of vibrant colors. However, in recent years these dyes have become of concern in wastewater management given their toxicity to humans and the environment. In the present work, researchers remediated [...] Read more.

Azo dyes are commonly used in textile color processing for their wide array of vibrant colors. However, in recent years these dyes have become of concern in wastewater management given their toxicity to humans and the environment. In the present work, researchers remediated water contaminated with azo dyes using silver nanoparticles (Ag NPs) intercalated within cotton fabric as a catalyst, for their enhanced durability and reusability, in a reductive degradation method. Three azo dyes—methyl orange (MO), Congo red (CR), and Chicago Sky Blue 6B (CSBB)—were investigated. The azo degradation was monitored by UV/vis spectroscopy, degradation capacity, and turnover frequency (TOF). The Ag NP–cotton catalyst exhibited excellent degradation capacity for the dyes, i.e., MO (96.4% in 30 min), CR (96.5% in 18.5 min), and CSBB (99.8% in 21 min), with TOFs of 0.046 min⁻¹, 0.082 min⁻¹, and 0.056 min⁻¹, respectively, using a 400 mg loading of catalyst for 100 mL of 25 mg L⁻¹ dye. To keep their high reusability while maintaining high catalytic efficiency of >95% degradation after 10 cycles, Ag NPs immobilized within cotton fabric have promising potential as eco-friendly bio-embedded catalysts. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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16 pages, 4520 KiB

Open AccessArticle

Silica-Supported Copper (II) Oxide Cluster via Ball Milling Method for Catalytic Combustion of Ethyl Acetate

by Yuhang Ye, Han Chen, Yuchuan Ye, Huiqiu Zhang, Jing Xu, Luhui Wang and Liuye Mo

Catalysts 2022, 12(5), 497; https://doi.org/10.3390/catal12050497 - 29 Apr 2022

Cited by 8 | Viewed by 3247

Abstract

Highly dispersed CuO/SiO₂ catalysts were successfully synthesized by a green process of ball milling (BM) under solvent-free and room temperature conditions. The structural evolution of CuO/SiO₂ catalysts prepared by BM was elucidated by TG-DSC, XRD, FT-IR, and XPS characterizations. We found [...] Read more.

Highly dispersed CuO/SiO₂ catalysts were successfully synthesized by a green process of ball milling (BM) under solvent-free and room temperature conditions. The structural evolution of CuO/SiO₂ catalysts prepared by BM was elucidated by TG-DSC, XRD, FT-IR, and XPS characterizations. We found that the copper acetate precursor was dispersed over the layer of copper phyllosilicate which was formed by reacting between the copper acetate precursor and the silica support during the BM process. The copper phyllosilicate layer over the support might play an important role in the stabilization of the CuO cluster (<2 nm) during thermal pretreatment. The 15% CuO/SiO₂ catalyst exhibited the best catalytic activity for the catalytic combustion of ethyl acetate as it owned a highest active surface area of CuO among the CuO/SiO₂ catalysts with different copper loadings. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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13 pages, 3028 KiB

Open AccessArticle

Oxide Derived Copper for Electrochemical Reduction of CO₂ to C₂₊ Products

by Anum Zahid, Afzal Shah and Iltaf Shah

Nanomaterials 2022, 12(8), 1380; https://doi.org/10.3390/nano12081380 - 18 Apr 2022

Cited by 30 | Viewed by 4522

Abstract

The electrochemical reduction of carbon dioxide (CO₂) on copper electrode derived from cupric oxide (CuO), named oxide derived copper (ODCu), was studied thoroughly in the potential range of −1.0 V to −1.5 V versus RHE. The CuO nanoparticles were prepared by [...] Read more.

The electrochemical reduction of carbon dioxide (CO₂) on copper electrode derived from cupric oxide (CuO), named oxide derived copper (ODCu), was studied thoroughly in the potential range of −1.0 V to −1.5 V versus RHE. The CuO nanoparticles were prepared by the hydrothermal method. The ODCu electrode was used for carbon dioxide reduction and the results revealed that this electrode is highly selective for C₂₊ products with enhanced current density at significantly less overpotential. This catalyst shifts the selectivity towards C₂₊ products with the highest Faradaic efficiency up to 58% at −0.95 V. In addition, C₂ product formation at the lowest onset potential of −0.1 V is achieved with the proposed catalyst. X-ray diffraction and scanning electron microscopy revealed the reduction of CuO to Cu (111) nanoparticles during the CO₂ RR. The intrinsic property of the synthesized catalyst and its surface reduction are suggested to induce sites or edges for facilitating the dimerization and coupling of intermediates to ethanol and ethylene. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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15 pages, 3567 KiB

Open AccessArticle

Efficient Adsorption-Assisted Photocatalysis Degradation of Congo Red through Loading ZIF-8 on KI-Doped TiO₂

by Zhechen Liu, Wanqi Zhang, Xilong Zhao, Xianliang Sheng, Zichu Hu, Qiang Wang, Zhangjing Chen, Sunguo Wang, Xiaotao Zhang and Ximing Wang

Materials 2022, 15(8), 2857; https://doi.org/10.3390/ma15082857 - 13 Apr 2022

Cited by 10 | Viewed by 2845

Abstract

Zeolitic imidazolate framework-8 (ZIF-8) was evenly loaded on the surface of TiO₂ doped with KI, using a solvent synthesis method, in order to produce a ZIF-8@TiO₂ (KI) adsorption photocatalyst with good adsorption and photocatalytic properties. The samples were characterized by XRD, [...] Read more.

Zeolitic imidazolate framework-8 (ZIF-8) was evenly loaded on the surface of TiO₂ doped with KI, using a solvent synthesis method, in order to produce a ZIF-8@TiO₂ (KI) adsorption photocatalyst with good adsorption and photocatalytic properties. The samples were characterized by XRD, SEM, EDX, XPS, BET and UV-Vis. The photocatalytic efficiency of the material was obtained by photocatalytic tests. The results indicate that the doping with I inhibited the grain growth and reduced the crystallite size of TiO₂, reduced the band gap width and improved the utilization rate for light. TiO₂ (KI) was a single crystal of anatase titanium dioxide. The combination of ZIF-8 and TiO₂ (KI) improved the specific surface area and increased the reaction site. The ZIF-8@TiO₂ (KI) for Congo red was investigated to validate its photocatalytic performance. The optimal concentration of Congo red solution was 30 mg/L, and the amount of catalyst was proportional to the degradation efficiency. The degradation efficiency of ZIF-8@TiO₂ (5%KI) was 76.42%, after being recycled four times. Full article

(This article belongs to the Topic Materials and Catalysts for Pollutants and CO₂ Capture and Transformation)

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