Synthesis of Nanocomposites and Catalysis Applications II

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: closed (31 July 2023) | Viewed by 35024

Special Issue Editor


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Guest Editor
1. Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
2. Physical Department, Novosibirsk State University, Novosibirsk 630090, Russia
Interests: should be transmission electron microscopy (TEM); X-ray diffraction; nanostructured catalysts; perovskites; ceramics; oxidation reactions; crystal structure; high temperature reactions; morphotropic phase transitions
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Special Issue Information

Dear Colleagues,

This Special Issue is a continuation of the previous one "Synthesis of Nanocomposites and Catalysis Applications", which was successfully concluded in the last year. This second part will be devoted to the development of nanocomposite synthesis methods and their application in various catalytic reactions. Many successful strategies for nanocomposites depend on the type of synthesis method used and predicting how its components will affect the entire future course of the process. Currently, many restrictions are imposed on the modern researcher in the form of environmental and technical safety, the cost of materials and processes, and the speed and simplicity of synthesis and catalytic reactions.

Determining the most optimal system often comes at the expense of significant time and costs. One of the successful strategies is to break the whole process into several stages and consider each stage separately. For this, as a rule, scientists select and use different physico-chemical research methods. The information obtained by X-ray analysis, electron microscopy, spectral methods, etc., can elucidate further steps for synthesis or catalytic processes. The resulting products are then subjected to detailed research, yielding valuable information about the reaction mechanisms and the catalyst behaviour. To further improve these stages of work, standardization of measurements, greater accuracy, and analysis of the data obtained in certain steps are necessary, constituting a time-consuming process.

This Special Issue of Nanomaterials, "Synthesis of Nanocomposites and Catalysis Applications II", will focus not only on the process of nanocomposite synthesis, but also on the stages to obtain individual components, establishing the relationship between the initial state of reagents and final products and their influence on the course of catalytic reactions.

Dr. Evgeny Gerasimov
Guest Editor

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Keywords

  • catalysts
  • nanocomposite
  • reaction
  • material characterisation
  • decomposition
  • synthesis

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Published Papers (13 papers)

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Editorial

Jump to: Research, Review

2 pages, 186 KiB  
Editorial
Synthesis of Nanocomposites and Catalysis Applications II
by Evgeny Gerasimov
Nanomaterials 2023, 13(23), 3054; https://doi.org/10.3390/nano13233054 - 30 Nov 2023
Cited by 1 | Viewed by 1452
Abstract
Nanocomposites, which refer to materials composed of nanoparticles dispersed in a matrix, have gained significant attention in various fields due to their unique properties and potential applications [...] Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)

Research

Jump to: Editorial, Review

13 pages, 2564 KiB  
Article
Escalating Catalytic Activity for Hydrogen Evolution Reaction on MoSe2@Graphene Functionalization
by Hoa Thi Bui, Nguyen Duc Lam, Do Chi Linh, Nguyen Thi Mai, HyungIl Chang, Sung-Hwan Han, Vu Thi Kim Oanh, Anh Tuan Pham, Supriya A. Patil, Nguyen Thanh Tung and Nabeen K. Shrestha
Nanomaterials 2023, 13(14), 2139; https://doi.org/10.3390/nano13142139 - 23 Jul 2023
Cited by 24 | Viewed by 2658
Abstract
Developing highly efficient and durable hydrogen evolution reaction (HER) electrocatalysts is crucial for addressing the energy and environmental challenges. Among the 2D-layered chalcogenides, MoSe2 possesses superior features for HER catalysis. The van der Waals attractions and high surface energy, however, stack the [...] Read more.
Developing highly efficient and durable hydrogen evolution reaction (HER) electrocatalysts is crucial for addressing the energy and environmental challenges. Among the 2D-layered chalcogenides, MoSe2 possesses superior features for HER catalysis. The van der Waals attractions and high surface energy, however, stack the MoSe2 layers, resulting in a loss of edge active catalytic sites. In addition, MoSe2 suffers from low intrinsic conductivity and weak electrical contact with active sites. To overcome the issues, this work presents a novel approach, wherein the in situ incorporated diethylene glycol solvent into the interlayers of MoSe2 during synthesis when treated thermally in an inert atmosphere at 600 °C transformed into graphene (Gr). This widened the interlayer spacing of MoSe2, thereby exposing more HER active edge sites with high conductivity offered by the incorporated Gr. The resulting MoSe2-Gr composite exhibited a significantly enhanced HER catalytic activity compared to the pristine MoSe2 in an acidic medium and demonstrated a superior HER catalytic activity compared to the state-of-the-art Pt/C catalyst, particularly at a high current density beyond ca. 55 mA cm−2. Additionally, the MoSe2-Gr catalyst demonstrated long-term electrochemical stability during HER. This work, thus, presents a facile and novel approach for obtaining an efficient MoSe2 electrocatalyst applicable in green hydrogen production. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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17 pages, 5911 KiB  
Article
Boosting the Catalytic Performance of AuAg Alloyed Nanoparticles Grafted on MoS2 Nanoflowers through NIR-Induced Light-to-Thermal Energy Conversion
by Sara Rodríguez-da-Silva, Abdel Ghafour El-Hachimi, José M. López-de-Luzuriaga, María Rodríguez-Castillo and Miguel Monge
Nanomaterials 2023, 13(6), 1074; https://doi.org/10.3390/nano13061074 - 16 Mar 2023
Cited by 4 | Viewed by 2314
Abstract
MoS2 nanoflowers (NFs) obtained through a hydrothermal approach were used as the substrate for the deposition of tiny spherical bimetallic AuAg or monometallic Au nanoparticles (NPs), leading to novel photothermal-assisted catalysts with different hybrid nanostructures and showing improved catalytic performance under NIR [...] Read more.
MoS2 nanoflowers (NFs) obtained through a hydrothermal approach were used as the substrate for the deposition of tiny spherical bimetallic AuAg or monometallic Au nanoparticles (NPs), leading to novel photothermal-assisted catalysts with different hybrid nanostructures and showing improved catalytic performance under NIR laser irradiation. The catalytic reduction of pollutant 4-nitrophenol (4-NF) to the valuable product 4-aminophenol (4-AF) was evaluated. The hydrothermal synthesis of MoS2 NFs provides a material with a broad absorption in the Vis-NIR region of the electromagnetic spectrum. The in situ grafting of alloyed AuAg and Au NPs of very small size (2.0–2.5 nm) was possible through the decomposition of organometallic complexes [Au2Ag2(C6F5)4(OEt2)2]n and [Au(C6F5)(tht)] (tht = tetrahydrothiophene) using triisopropilsilane as reducing agent, leading to nanohybrids 14. The new nanohybrid materials display photothermal properties arising from NIR light absorption of the MoS2 NFs component. The AuAg-MoS2 nanohybrid 2 showed excellent photothermal-assisted catalytic activity for the reduction of 4-NF, which is better than that of the monometallic Au-MoS2 nanohybrid 4. The obtained nanohybrids were characterised by transmission electron microscopy (TEM), High Angle Annular Dark Field—Scanning Transmission Electron Microscopy—Energy Dispersive X-ray Spectroscopy (HAADF-STEM-EDS), X-ray photoelectron spectroscopy and UV-Vis-NIR spectroscopy. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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14 pages, 3841 KiB  
Article
Methanol and Ethanol Electrooxidation on ZrO2/NiO/rGO
by Mohammad Bagher Askari, Hadi Beitollahi and Antonio Di Bartolomeo
Nanomaterials 2023, 13(4), 679; https://doi.org/10.3390/nano13040679 - 9 Feb 2023
Cited by 17 | Viewed by 2513
Abstract
Recently, transition metal oxides have been considered for various applications due to their unique properties. We present the synthesis of a three-component catalyst consisting of zirconium oxide (ZrO2), nickel oxide (NiO), and reduced graphene oxide (rGO) in the form of ZrO [...] Read more.
Recently, transition metal oxides have been considered for various applications due to their unique properties. We present the synthesis of a three-component catalyst consisting of zirconium oxide (ZrO2), nickel oxide (NiO), and reduced graphene oxide (rGO) in the form of ZrO2/NiO/rGO by a simple one-step hydrothermal method. X-ray powder diffraction (XRD), scanning electron microscope (SEM), and bright-field transmission electron microscopy (BF-TEM) analyses were performed to accurately characterize the catalysts. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and linear sweep voltammetry (LSV) analyses were also carried out to investigate the methanol and ethanol alcohol electrooxidation ability of the synthesized nanocatalysts. Inspired by the good potential of metal oxides in the field of catalysts, especially in fuel-cell anodes, we investigated the capability of this catalyst in the methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR). After proving the successful synthesis and examining the surface morphology of these materials, detailed electrochemical tests were performed to show the outstanding capability of this new nanocatalyst for use in the anode of alcohol fuel cells. ZrO2/NiO/rGO indicated a current density of 26.6 mA/cm2 at a peak potential of 0.52 V and 99.5% cyclic stability in the MOR and a current density of 17.3 mA/cm2 at a peak potential of 0.52 V and 98.5% cyclic stability in the EOR (at optimal concentration/scan rate 20 mV/s), representing an attractive option for use in the anode of alcoholic fuel cells. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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14 pages, 3407 KiB  
Article
Fabrication of Novel Heterostructure-Functionalized Graphene-Based TiO2-Sr-Hexaferrite Photocatalyst for Environmental Remediation
by Kefayat Ullah and Won-Chun Oh
Nanomaterials 2023, 13(1), 55; https://doi.org/10.3390/nano13010055 - 22 Dec 2022
Cited by 4 | Viewed by 1857
Abstract
Novel visible-light photocatalyst (titanium-dioxide-functionalized graphene/strontium-hexaferrites) TiO2-FG/Sr-hexaferrite nanocomposites were fabricated using a simple hydrothermal technique. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), Raman spectroscopic analysis, and atomic force microscopy were used to [...] Read more.
Novel visible-light photocatalyst (titanium-dioxide-functionalized graphene/strontium-hexaferrites) TiO2-FG/Sr-hexaferrite nanocomposites were fabricated using a simple hydrothermal technique. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), Raman spectroscopic analysis, and atomic force microscopy were used to analyze the composites as prepared. The unique TiO2-FG/Sr-hexaferrite-based composite catalyst reveals superior photocatalytic properties for the disintegration of organic dyes methylene blue (MB) and rhodamine B (Rh. B) under visible-light irradiation. The result showed that the functionalized graphene with ternary structure improved the catalytic behavior of the composite due to the synergistic effect of the TiO2-FG boosted by the graphene surface to provide a fast conducting path to the photogenerated charge carrier. The markedly high photocatalytic behavior has been ascribed to the formation of the ternary structure between TiO2, FG, and Sr-hexaferrites through interface interaction. The prepared photocatalyst composite exhibited better recyclability, which further confirms its future uses as a photocatalyst in industrial waste products. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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15 pages, 2385 KiB  
Article
Synthesis of Co-Ni Alloy Particles with the Structure of a Solid Substitution Solution by Precipitation in a Supercritical Carbon Dioxide
by Nikolay Nesterov, Vera Pakharukova, Svetlana Cherepanova, Stanislav Yakushkin, Evgeniy Gerasimov, Dmitry Balaev, Sergei Semenov, Andrey Dubrovskii and Oleg Martyanov
Nanomaterials 2022, 12(24), 4366; https://doi.org/10.3390/nano12244366 - 7 Dec 2022
Cited by 5 | Viewed by 1689
Abstract
Mixed Co-Ni bimetallic systems with the structure of a solid substitution solution have been synthesized using the supercritical antisolvent precipitation (SAS) method, which uses supercritical CO2 as an antisolvent. The systems obtained have been characterized in detail using X-ray diffraction (XRD), high-resolution [...] Read more.
Mixed Co-Ni bimetallic systems with the structure of a solid substitution solution have been synthesized using the supercritical antisolvent precipitation (SAS) method, which uses supercritical CO2 as an antisolvent. The systems obtained have been characterized in detail using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Fourier-transform infrared (FTIR) spectroscopy, and magnetostatic measurements. It has been found that Co-enriched systems have a defective hexagonal close-packed (hcp) structure, which was described by a model which embedded cubic fragments of packaging into a hexagonal close-packed (hcp) structure. It has been shown that an increase in water content at the precipitation stage leads to a decrease in the size of cubic fragments and a more uniform distribution of them in Co-enriched systems. It has also been shown that mixed systems have the greatest coercivity in the line of samples. Ni-enriched bimetallic systems have a cubic close-packed (ccp) structure with modified crystal lattice parameters. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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23 pages, 5090 KiB  
Article
Visible-Light-Active N-Doped TiO2 Photocatalysts: Synthesis from TiOSO4, Characterization, and Enhancement of Stability Via Surface Modification
by Nikita Kovalevskiy, Dmitry Svintsitskiy, Svetlana Cherepanova, Stanislav Yakushkin, Oleg Martyanov, Svetlana Selishcheva, Evgeny Gribov, Denis Kozlov and Dmitry Selishchev
Nanomaterials 2022, 12(23), 4146; https://doi.org/10.3390/nano12234146 - 23 Nov 2022
Cited by 19 | Viewed by 2790
Abstract
This paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO2. The synthesis is performed using titanium oxysulfate as a low-cost inorganic precursor and ammonia as a precipitating agent, as well [...] Read more.
This paper describes the chemical engineering aspects for the preparation of highly active and stable nanocomposite photocatalysts based on N-doped TiO2. The synthesis is performed using titanium oxysulfate as a low-cost inorganic precursor and ammonia as a precipitating agent, as well as a source of nitrogen. Mixing the reagents under a control of pH leads to an amorphous titanium oxide hydrate, which can be further successfully converted to nanocrystalline anatase TiO2 through calcination in air at an increased temperature. The as-prepared N-doped TiO2 provides the complete oxidation of volatile organic compounds both under UV and visible light, and the action spectrum of N-doped TiO2 correlates to its absorption spectrum. The key role of paramagnetic nitrogen species in the absorption of visible light and in the visible-light-activity of N-doped TiO2 is shown using the EPR technique. Surface modification of N-doped TiO2 with copper species prevents its intense deactivation under highly powerful radiation and results in a nanocomposite photocatalyst with enhanced activity and stability. The photocatalysts prepared under different conditions are discussed regarding the effects of their characteristics on photocatalytic activity under UV and visible light. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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12 pages, 3346 KiB  
Article
MnCo2O4/NiCo2O4/rGO as a Catalyst Based on Binary Transition Metal Oxide for the Methanol Oxidation Reaction
by Mohammad Bagher Askari, Sadegh Azizi, Mohammad Taghi Tourchi Moghadam, Majid Seifi, Seyed Mohammad Rozati and Antonio Di Bartolomeo
Nanomaterials 2022, 12(22), 4072; https://doi.org/10.3390/nano12224072 - 18 Nov 2022
Cited by 35 | Viewed by 2593
Abstract
The demands for alternative energy have led researchers to find effective electrocatalysts in fuel cells and increase the efficiency of existing materials. This study presents new nanocatalysts based on two binary transition metal oxides (BTMOs) and their hybrid with reduced graphene oxide for [...] Read more.
The demands for alternative energy have led researchers to find effective electrocatalysts in fuel cells and increase the efficiency of existing materials. This study presents new nanocatalysts based on two binary transition metal oxides (BTMOs) and their hybrid with reduced graphene oxide for methanol oxidation. Characterization of the introduced three-component composite, including cobalt manganese oxide (MnCo2O4), nickel cobalt oxide (NiCo2O4), and reduced graphene oxide (rGO) in the form of MnCo2O4/NiCo2O4/rGO (MNR), was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), and energy-dispersive X-ray (EDX) analyses. The alcohol oxidation capability of MnCo2O4/NiCo2O4 (MN) and MNR was evaluated in the methanol oxidation reaction (MOR) process. The crucial role of rGO in improving the electrocatalytic properties of catalysts stems from its large active surface area and high electrical conductivity. The alcohol oxidation tests of MN and MNR showed an adequate ability to oxidize methanol. The better performance of MNR was due to the synergistic effect of MnCo2O4/NiCo2O4 and rGO. MN and MNR nanocatalysts, with a maximum current density of 14.58 and 24.76 mA/cm2 and overvoltage of 0.6 and 0.58 V, as well as cyclic stability of 98.3% and 99.7% (at optimal methanol concentration/scan rate of 20 mV/S), respectively, can be promising and inexpensive options in the field of efficient nanocatalysts for use in methanol fuel cell anodes. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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23 pages, 3435 KiB  
Article
Carbon Formation during Methane Dry Reforming over Ni-Containing Ceria-Zirconia Catalysts
by Ekaterina Smal, Yulia Bespalko, Marina Arapova, Valeria Fedorova, Konstantin Valeev, Nikita Eremeev, Ekaterina Sadovskaya, Tamara Krieger, Tatiana Glazneva, Vladislav Sadykov and Mikhail Simonov
Nanomaterials 2022, 12(20), 3676; https://doi.org/10.3390/nano12203676 - 19 Oct 2022
Cited by 20 | Viewed by 2552
Abstract
Two series of Ni/Ce(Ti/Nb)ZrO2 catalysts were prepared using citrate route and original solvothermal continuous flow synthesis in supercritical isopropanol and studied in dry reforming of methane (DRM). TEM, XPS and FTIRS of adsorbed CO confirm influence of support composition and preparation method [...] Read more.
Two series of Ni/Ce(Ti/Nb)ZrO2 catalysts were prepared using citrate route and original solvothermal continuous flow synthesis in supercritical isopropanol and studied in dry reforming of methane (DRM). TEM, XPS and FTIRS of adsorbed CO confirm influence of support composition and preparation method on the catalysts’ morphology and surface features. The oxygen mobility was studied by isotope heteroexchange with C18O2. After testing in DRM, carbon deposits after catalysts’ testing in DRM were investigated by temperature-programmed oxidation with thermo-gravimetric analysis. The lowest amounts of carbon deposits were obtained for unmodified Ni-CeZr and Ni-CeNbZr compositions. Ti addition lead to an increased amount of carbon, which was removed at higher temperatures. The use of supercritical supports also resulted in the formation of a higher amount of coke. Catalysts prepared by the supercritical synthesis were tested in DRM for 25 h. The highest activity drop was observed in the first three hours. For all compositions, close values of carbon deposits were revealed. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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16 pages, 5929 KiB  
Article
Effect of Ce/Zr Composition on Structure and Properties of Ce1−xZrxO2 Oxides and Related Ni/Ce1−xZrxO2 Catalysts for CO2 Methanation
by Vera P. Pakharukova, Dmitriy I. Potemkin, Vladimir N. Rogozhnikov, Olga A. Stonkus, Anna M. Gorlova, Nadezhda A. Nikitina, Evgeniy A. Suprun, Andrey S. Brayko, Vladimir A. Rogov and Pavel V. Snytnikov
Nanomaterials 2022, 12(18), 3207; https://doi.org/10.3390/nano12183207 - 15 Sep 2022
Cited by 8 | Viewed by 2377
Abstract
Ce1−xZrxO2 oxides (x = 0.1, 0.25, 0.5) prepared via the Pechini route were investigated using XRD analysis, N2 physisorption, TEM, and TPR in combination with density functional theory calculations. The Ni/Ce1−xZrxO2 catalysts [...] Read more.
Ce1−xZrxO2 oxides (x = 0.1, 0.25, 0.5) prepared via the Pechini route were investigated using XRD analysis, N2 physisorption, TEM, and TPR in combination with density functional theory calculations. The Ni/Ce1−xZrxO2 catalysts were characterized via XRD analysis, SEM-EDX, TEM-EDX, and CO chemisorption and tested in carbon dioxide methanation. The obtained Ce1−xZrxO2 materials were single-phase solid solutions. The increase in Zr content intensified crystal structure strains and favored the reducibility of the Ce1−xZrxO2 oxides but strongly affected their microstructure. The catalytic activity of the Ni/Ce1−xZrxO2 catalysts was found to depend on the composition of the Ce1−xZrxO2 supports. The detected negative effect of Zr content on the catalytic activity was attributed to the decrease in the dispersion of the Ni0 nanoparticles and the length of metal–support contacts due to the worsening microstructure of Ce1−xZrxO2 oxides. The improvement of the redox properties of the Ce1−xZrxO2 oxide supports through cation modification can be negated by changes in their microstructure and textural characteristics. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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16 pages, 3876 KiB  
Article
Copper-Modified Titania-Based Photocatalysts for the Efficient Hydrogen Production under UV and Visible Light from Aqueous Solutions of Glycerol
by Anna Yu. Kurenkova, Anastasiya Yu. Yakovleva, Andrey A. Saraev, Evgeny Yu. Gerasimov, Ekaterina A. Kozlova and Vasily V. Kaichev
Nanomaterials 2022, 12(18), 3106; https://doi.org/10.3390/nano12183106 - 7 Sep 2022
Cited by 14 | Viewed by 2030
Abstract
In this study, we have proposed titania-based photocatalysts modified with copper compounds for hydrogen evolution. Thermal pre-treatment of commercial TiO2 Degussa P25 (DTiO2) and Hombifine N (HTiO2) in the range from 600 to 800 °C was carried out [...] Read more.
In this study, we have proposed titania-based photocatalysts modified with copper compounds for hydrogen evolution. Thermal pre-treatment of commercial TiO2 Degussa P25 (DTiO2) and Hombifine N (HTiO2) in the range from 600 to 800 °C was carried out followed by the deposition of copper oxides (1–10 wt. % of Cu). The morphology and chemical state of synthesized photocatalysts were studied using X-ray diffraction, UV–Vis diffuse reflectance spectroscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and XANES/EXAFS X-ray absorption spectroscopy. Photocatalytic activity was tested in the hydrogen evolution from aqueous solutions of glycerol under ultraviolet (λ = 381 nm) and visible (λ = 427 nm) light. The photocatalysts 2% CuOx/DTiO2 T750 and 5% CuOx/DTiO2 T700 showed the highest activity under UV irradiation (λ = 380 nm), with the rate of H2 evolution at the level of 2.5 mmol (H2) g−1 h−1. Under the visible light irradiation (λ = 427 nm), the highest activity of 0.6 mmol (H2) g−1 h−1 was achieved with the 5% CuOx/DTiO2 T700 photocatalyst. The activity of these photocatalysts is 50% higher than that of the platinized 1% Pt/DTiO2 sample. Thus, it was shown for the first time that a simple heat treatment of a commercial titanium dioxide in combination with a deposition of non-noble metal particles led to a significant increase in the activity of photocatalysts and made it possible to obtain materials that were active in hydrogen production under visible light irradiation. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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11 pages, 3037 KiB  
Article
Strainer-Separable TiO2 on Halloysite Nanocomposite-Embedded Alginate Capsules with Enhanced Photocatalytic Activity for Degradation of Organic Dyes
by Jewon Lee, Sicheon Seong, Soyeong Jin, Jaeyong Kim, Youngdo Jeong and Jaegeun Noh
Nanomaterials 2022, 12(14), 2361; https://doi.org/10.3390/nano12142361 - 10 Jul 2022
Cited by 8 | Viewed by 2287
Abstract
Photocatalysis driven by natural sunlight is an attractive approach to removing pollutants from wastewater. Although TiO2–based photocatalysts using various support nano-materials with high catalytic activity and reusability have been developed for purifying wastewater, the centrifugal separation methods used for the nanocatalysts [...] Read more.
Photocatalysis driven by natural sunlight is an attractive approach to removing pollutants from wastewater. Although TiO2–based photocatalysts using various support nano-materials with high catalytic activity and reusability have been developed for purifying wastewater, the centrifugal separation methods used for the nanocatalysts limit their use for treating large amounts of water. Here, we prepared a TiO2 nano-catalyst supported on a halloysite nanotube (HNT)-encapsulated alginate capsule (TiO2@HNT/Alcap) to recapture the catalysts rapidly without centrifugation. The structure of TiO2@HNT/Alcap was characterized by X-ray diffraction, SEM, and TGA. In our system, the combination of HNTs and alginate capsules (Alcaps) improved the efficiency of adsorption of organic pollutants to TiO2, and their milli = meter scale structure allowed ultra-fast filtering using a strainer. The TiO2@HNT/Alcaps showed ~1.7 times higher adsorption of rhodamine B compared to empty alginate capsules and also showed ~10 and ~6 times higher degradation rate compared to the HNT/Alcaps and TiO2/Alcaps, respectively. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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Review

Jump to: Editorial, Research

25 pages, 2339 KiB  
Review
Advancements in Nanoparticle Deposition Techniques for Diverse Substrates: A Review
by Daniel Escorcia-Díaz, Sebastián García-Mora, Leidy Rendón-Castrillón, Margarita Ramírez-Carmona and Carlos Ocampo-López
Nanomaterials 2023, 13(18), 2586; https://doi.org/10.3390/nano13182586 - 19 Sep 2023
Cited by 47 | Viewed by 6977
Abstract
Nanoparticle deposition on various substrates has gained significant attention due to the potential applications of nanoparticles in various fields. This review paper comprehensively analyzes different nanoparticle deposition techniques on ceramic, polymeric, and metallic substrates. The deposition techniques covered include electron gun evaporation, physical [...] Read more.
Nanoparticle deposition on various substrates has gained significant attention due to the potential applications of nanoparticles in various fields. This review paper comprehensively analyzes different nanoparticle deposition techniques on ceramic, polymeric, and metallic substrates. The deposition techniques covered include electron gun evaporation, physical vapor deposition, plasma enriched chemical vapor deposition (PECVD), electrochemical deposition, chemical vapor deposition, electrophoretic deposition, laser metal deposition, and atomic layer deposition (ALD), thermophoretic deposition, supercritical deposition, spin coating, and dip coating. Additionally, the sustainability aspects of these deposition techniques are discussed, along with their potential applications in anti-icing, antibacterial power, and filtration systems. Finally, the review explores the importance of deposition purities in achieving optimal nanomaterial performance. This comprehensive review aims to provide valuable insights into state-of-the-art techniques and applications in the field of nanomaterial deposition. Full article
(This article belongs to the Special Issue Synthesis of Nanocomposites and Catalysis Applications II)
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