Heterogeneous Catalysis and Advanced Oxidation Processes (AOP) for Environmental Protection (VOCs Oxidation, Air and Water Purification), 2nd Edition

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Environmental Catalysis".

Deadline for manuscript submissions: 5 July 2024 | Viewed by 7705

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Guest Editor
Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
Interests: heterogeneous catalysis; photocatalysis; TiO2-based materials; air purification; water treatment; H2 economy; VOC oxidation; H2 production and purification; CO2 valorization
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Special Issue Information

Dear Colleagues,

The quality of air and water is a crucial contemporary problem. The globalization economy and the rapid growth of new economic powers have given rise to new problems related to environmental protection. The catalysis science has always given smart, green, and scale-up eco-friendly solutions. In the last year, together with the traditional and efficient catalytic thermal treatments, new and emerging techniques such as photothermal treatments or advanced oxidation processes (photocatalysis, Fenton and PhotoFenton, Ozonation, etc.) have provided good results both in air and water purification.

Based on the above considerations, submissions to this Special Issue on “Heterogeneous Catalysis and Advanced Oxidation Processes (AOP) for Environmental Protection (VOCs Oxidation, Air and Water Purification)” are welcome in the form of original research papers, reviews or communications that highlight the state of research in the VOCs oxidation (catalytic oxidation, photocatalytic oxidation or photothermal catalytic oxidation); air purification; wastewater treatments (adsorption, membrane filtration, AOP, photocatalysis, Fenton and PhotoFenton, ozonation, etc.); development of new catalysts for environmental protection; correlation structure–activity of new catalysts applied for green solutions; new environmentally friendly materials; characterization in “situ” of the oxidation processes; and supported and unsupported catalysts (metal oxide, MOF, zeolite, nanocatalyst, noble metal-based catalysts, mono and bimetallic catalysts, etc.) for environmental applications.

Dr. Roberto Fiorenza
Guest Editor

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Keywords

  • VOC
  • water treatment
  • air purification
  • AOP (advanced oxidation process)
  • photothermal conversion
  • photocatalysis
  • Fenton and PhotoFenton treatment
  • thermal catalytic treatment
  • supported and unsupported catalysts (metal oxide, MOF, zeolite, nanocatalyst, noble metal-based catalysts, mono and bimetallic catalysts, and others)

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Published Papers (5 papers)

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Research

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13 pages, 1937 KiB  
Article
Direct Conversion of Ethanol to Propylene over Zn-Modified HBeta Zeolite: Influence of Zinc Precursors
by Ting Bai, Xiaohui Li, Liang Ding, Jin Wang, Yong-Shan Xiao and Bin Cao
Catalysts 2024, 14(4), 276; https://doi.org/10.3390/catal14040276 - 19 Apr 2024
Viewed by 247
Abstract
A series of Zn-modified HBeta (Zn/HBeta) catalysts were prepared via the wetness impregnation method with different zinc precursors such as ZnSO4·7H2O, ZnCl2, C4H6O4Zn·2H2O and Zn(NO3)2·6H [...] Read more.
A series of Zn-modified HBeta (Zn/HBeta) catalysts were prepared via the wetness impregnation method with different zinc precursors such as ZnSO4·7H2O, ZnCl2, C4H6O4Zn·2H2O and Zn(NO3)2·6H2O, and their catalytic performance in the conversion of ethanol to propylene reaction was evaluated. Results indicate that the amount and strength distribution of the acid sites of the Zn/HBeta catalysts were easily tuned by employing different types of zinc precursors. More importantly, when the zinc species were introduced to the HBeta, the propylene yield was significantly enhanced, whereas the yields of ethylene and C2–C4 alkanes were remarkably suppressed. For the catalyst prepared by using the ZnCl2 precursor, a higher propylene yield of up to 43.4% for Zn/HBeta-C was achieved as a result of the moderate amount and strength distribution of acid sites. The average coking rate of the used Zn/HBeta catalysts strongly depended on the amount of total acid sites, especially the strong acid sites, i.e., the higher the amount of total acid sites of the catalyst, the greater the average coking rate. For the catalyst prepared by using the ZnSO4·7H2O precursor, Zn/HBeta-S exhibited a better stability even after depositing more coke, which was due to the higher amount of strong acid sites. Full article
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16 pages, 8106 KiB  
Article
Laser-Induced Nitrogen-Doped Graphene Composite Iron–Cobalt Hydroxide for Methylene Blue Degradation via Electrocatalytic Activation of Peroxymonosulfate
by Liqin Chen, Jianjun Liao, Chen Li, Yandong Xu, Chengjun Ge, Wen Xu, Xiong He and Wenyu Liu
Catalysts 2023, 13(6), 922; https://doi.org/10.3390/catal13060922 - 23 May 2023
Viewed by 1233
Abstract
With the acceleration of industrialization, the removal of refractory organic dyes from water and how to promote its practical application remains a challenge. Herein, we synthesized an FeCo-LDH/LI-NDG composite electrode material by a simple laser-induced technique on polyimide films, which could electrocatalytically activate [...] Read more.
With the acceleration of industrialization, the removal of refractory organic dyes from water and how to promote its practical application remains a challenge. Herein, we synthesized an FeCo-LDH/LI-NDG composite electrode material by a simple laser-induced technique on polyimide films, which could electrocatalytically activate peroxymonosulfate (PMS) to completely degrade MB in about 6 min. The reaction rate constant (kobs) was 0.461 min−1. It was faster than most of the currently reported electrocatalysts. The reaction system demonstrated good interference resistance and catalytic effectiveness in the pH range of 3 to 9. According to the chemical quenching and electron paramagnetic resonance (EPR) experiments, the non-radical pathway of 1O2 and the radical pathways of SO4·−, ·OH and O2·− were involved in the reaction synergistically, with 1O2 playing the dominant role. 1O2 was produced through the dual pathway of PMS electron loss at the anode and O2·− intermediate transformation at the cathode. The two activation methods of electro-activation and catalytic activation of PMS had synergistic effects to achieve high efficiency in the whole process of production, reaction and recovery, providing new ideas to advance practical applications. Full article
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19 pages, 4572 KiB  
Article
Influence of Y Doping on Catalytic Activity of CeO2, MnOx, and CeMnOx Catalysts for Selective Catalytic Reduction of NO by NH3
by Eleonora La Greca, Tamara S. Kharlamova, Maria V. Grabchenko, Valery A. Svetlichnyi, Giuseppe Pantaleo, Luca Consentino, Olga A. Stonkus, Olga V. Vodyankina and Leonarda Francesca Liotta
Catalysts 2023, 13(5), 901; https://doi.org/10.3390/catal13050901 - 17 May 2023
Cited by 1 | Viewed by 1275
Abstract
Novel yttrium-doped CeO2, MnOx, and CeMnOx composites are investigated as catalysts for low-temperature NH3-SCR. The study involves the preparation of unmodified oxide supports using a citrate method followed by modification with Y (2 wt.%) using two [...] Read more.
Novel yttrium-doped CeO2, MnOx, and CeMnOx composites are investigated as catalysts for low-temperature NH3-SCR. The study involves the preparation of unmodified oxide supports using a citrate method followed by modification with Y (2 wt.%) using two approaches, including the one-pot citrate method and incipient wetness impregnation of undoped oxides. The NH3-SCR reaction is studied in a fixed-bed quartz reactor to test the ability of the prepared catalysts in NO reduction. The gas reaction mixture consists of 800 ppm NO, 800 ppm NH3, 10 vol.% O2, and He as a balance gas at a WHSV of 25,000 mL g−1 h−1. The results indicate that undoped CeMnOx mixed oxide exhibits significantly higher deNOx performance compared with undoped and Y-doped MnOx and CeO2 catalysts. Indeed, yttrium presence in CeMnOx promotes the competitive NH3-SCO reaction, reducing the amount of NH3 available for NO reduction and lowering the catalyst activity. Furthermore, the physical-chemical properties of the prepared catalysts are studied using nitrogen adsorption/desorption, XRD, Raman spectroscopy, temperature-programmed reduction with hydrogen, and temperature-programmed desorption of ammonia. This study presents a promising approach to enhancing the performance of NH3-SCR catalysts at low temperatures that can have significant implications for reducing NO emissions. Full article
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12 pages, 2152 KiB  
Article
Ofloxacin Degradation over Nanosized Fe3O4 Catalyst viaThermal Activation of Persulfate Ions
by Sergio Fernández-Velayos, Nieves Menéndez, Pilar Herrasti and Eva Mazarío
Catalysts 2023, 13(2), 256; https://doi.org/10.3390/catal13020256 - 22 Jan 2023
Cited by 2 | Viewed by 1345
Abstract
In this work, an Fe3O4 catalyst was synthetized in a single step via electrochemical synthesis. The Fe3O4 catalyst was used to evaluate the degradation of Ofloxacin (OFX) using a heterogeneous advanced oxidation process with sodium persulfate (PS). [...] Read more.
In this work, an Fe3O4 catalyst was synthetized in a single step via electrochemical synthesis. The Fe3O4 catalyst was used to evaluate the degradation of Ofloxacin (OFX) using a heterogeneous advanced oxidation process with sodium persulfate (PS). PS activation was successfully achieved via thermal conventional heating directly and subsequently applied for the degradation of OFX. The degradation kinetics were studied under different conditions, such as catalyst and oxidant concentration and temperature. The results show that a higher reaction temperature, catalyst and initial PS dose strongly influence the degradation efficiency. Thermal activation of persulfate was tested at 20, 40 and 60 °C. At 60 °C, the half-time of OFX was 23 times greater than at 20 °C, confirming the activation of persulfate. Mineralization studies also showed that under optimized conditions (20 mM of persulfate, 1 g/L catalyst and 100 mg/L OFX), a 66% reduction in organic matter was observed, in contrast to that obtained at 40 °C and 20 °C, which was null. The reusability, as tested through the fourth reuse cycle, resulted in a 38% reduced degradation efficiency when comparing the first and last cycle. Furthermore, the electrosynthesized catalyst presented similar degradation efficiencies in both real water and MilliQ, mainly because of the Cl2 generation at high Cl concentrations that takes place in Cl contaminated water. Full article
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Review

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20 pages, 3518 KiB  
Review
Recent Advances in Vehicle Exhaust Treatment with Photocatalytic Technology
by Jianyong Zhao, Jianpeng Sun, Xiangchao Meng and Zizhen Li
Catalysts 2022, 12(9), 1051; https://doi.org/10.3390/catal12091051 - 15 Sep 2022
Cited by 6 | Viewed by 2930
Abstract
Vehicle exhaust has been acknowledged as an essential factor affecting human health due to the extensive use of cars. Its main components include volatile organic compounds (VOCs) and nitrogen oxides (NOx), which can cause acute irritation and chronic diseases, and significant [...] Read more.
Vehicle exhaust has been acknowledged as an essential factor affecting human health due to the extensive use of cars. Its main components include volatile organic compounds (VOCs) and nitrogen oxides (NOx), which can cause acute irritation and chronic diseases, and significant research on the treatment of vehicle exhaust has received increasing attention in recent decades. Recently, photocatalytic technology has been considered a practical approach for eliminating vehicle emissions. This review highlights the crucial role of photocatalytic technology in eliminating vehicle emissions using semiconductor catalysts. A particular emphasis has been placed on various photocatalytic materials, such as TiO2-based materials, Bi-based materials, and Metal–Organic Frameworks (MOFs), and their recent advances in the performance of VOC and NOx photodegradation. In addition, the applications of photocatalytic technology for the elimination of vehicle exhaust are presented (including photocatalysts combined with pavement surfaces, making photocatalysts into architectural coatings and photoreactors), which will offer a promising strategy for photocatalytic technology to remove vehicle exhaust. Full article
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