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Heterogeneous Catalysis in Environmental Application
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Heterogeneous Catalysis in Environmental Application

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Applied Chemistry".

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 3982

Special Issue Editors

Dr. Guangshan Zhang

E-Mail Website
Guest Editor
School of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China
Interests: water treatment; microbiological treatment; advanced oxidation; adsorption; environment functional material
Dr. Jianhua Qu

E-Mail Website
Guest Editor
School of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
Interests: water treatment; microbiological treatment; advanced oxidation; adsorption; environment functional material

Special Issue Information

Dear Colleagues,

Although industrial development has contributed to the prosperity of society, its production process has inevitably resulted in potential water pollution due to industrial sewage discharge. The biodegradability and toxicity of synthetic compounds limit conventional water treatments. There has been a massive surge in attempts to develop efficient and clean water treatment technologies to meet the global challenges of water contamination. The reactive groups produced by the advanced oxidation process can efficiently degrade organic pollutants in water, which has become one of the most promising water treatment technologies. Photocatalysis, plasma, electrochemical oxidation, and oxidizer activation are effective water treatment processes, and the addition of catalysts can release the potential of these technologies. Thus, this Special Issue is devoted to the science behind catalysts, including but not limited to their fabrication, characterization, function mechanism, and application in reactors. There is an avalanche of challenges regarding the further understanding of constructing highly efficient catalysts and the mechanisms behind high-efficiency catalysis. Specifically, the intrinsic relationship between the catalyst and oxidation system needs to be investigated in detail. This Special Issue will serve as a reliable resource and technical support for those working in heterogeneous catalytic oxidation technology.

Dr. Guangshan Zhang
Dr. Jianhua Qu
Guest Editors

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Keywords

  • catalytic support
  • catalyst
  • persulfate catalysis
  • Fenton-like
  • photocatalysis

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Published Papers (3 papers)

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Research

11 pages, 2215 KiB  
Article
Enhancing Performance of Organic Pollutant Degradation via Building Heterojunctions with ZnO Nanowires and Na Doped Conjugated 2,4,6-Triaminopyrimidin-g-C3N4
by Ziyi Liu, Zixin Ruan, Xiaojie Yang, Yaqiong Huang and Jun Xing
Molecules 2024, 29(13), 3240; https://doi.org/10.3390/molecules29133240 - 8 Jul 2024
Viewed by 826
Abstract
Organic pollutants were one of the main sources of environmental pollutants. The degradation of organic pollutants through photocatalytic technology was one of the effective solutions. By preparing zinc oxide(ZnO) nanowires modified with sodium-doped conjugated 2,4,6-triaminopyrimidin-g-C3N4 (NaTCN) heterojunction (ZnO/NaTCN), the photocatalytic [...] Read more.
Organic pollutants were one of the main sources of environmental pollutants. The degradation of organic pollutants through photocatalytic technology was one of the effective solutions. By preparing zinc oxide(ZnO) nanowires modified with sodium-doped conjugated 2,4,6-triaminopyrimidin-g-C3N4 (NaTCN) heterojunction (ZnO/NaTCN), the photocatalytic performance of NaTCN modified with different ratios of ZnO was systematically studied. The photocatalytic performance was studied through the degradation performance of methyl blue (MB) dye. The results showed that 22.5 wt% ZnO/NaTCN had the best degradation effect on MB dye. The degradation rate of MB reached 98.54% in 70 min. After three cycles, it shows good cycling stability (degradation rate is 96.99%) for dye degradation. It was found that there are two types of active species: ·OH and h+, of which h+ is the main active species produced by photocatalytic degradation of dyes. The excellent degradation performance was attributed to the fact that ZnO facilitated the extraction and transport of photogenerated carriers. The doping of sodium facilitated charge transfer. The NaTCN conjugated system promoted the extraction and transfer of photogenerated carriers. It provided guidance for designing efficient composite catalysts for use in other renewable energy fields. Full article
(This article belongs to the Special Issue Heterogeneous Catalysis in Environmental Application)
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15 pages, 6144 KiB  
Article
High-Efficiency Photo-Fenton-like Catalyst of FeOOH/g-C3N4 for the Degradation of PNP: Characterization, Catalytic Performance and Mechanism Exploration
by Rongjun Su, Junhao Wang, Hao Jiang, Lan Wei, Deying Mu and Chunyan Yang
Molecules 2024, 29(13), 3202; https://doi.org/10.3390/molecules29133202 - 5 Jul 2024
Viewed by 905
Abstract
The composite photocatalyst FeOOH/g-C3N4 was prepared through thermal polycondensation and co-precipitation methods, followed by XRD, SEM and UV-vis characterization. The stability of FeOOH/g-C3N4 was explored by the recycling test. The active species in the reaction system were [...] Read more.
The composite photocatalyst FeOOH/g-C3N4 was prepared through thermal polycondensation and co-precipitation methods, followed by XRD, SEM and UV-vis characterization. The stability of FeOOH/g-C3N4 was explored by the recycling test. The active species in the reaction system were investigated by the capture experiment. The results indicated that the optimal preparation condition for g-C3N4 involved calcination at 600 °C for 4 h. XRD analysis revealed that g-C3N4 exhibits a high-purity phase, and Fe in FeOOH/g-C3N4 exists in a highly dispersed amorphous state. SEM analysis showed that FeOOH/g-C3N4 has a rough surface with an irregular layered structure. Element composition analysis confirmed that the content of elements in the prepared catalyst is consistent with the theoretical calculation. FeOOH/g-C3N4 possesses the largest specific surface area of 143.2 m2/g and a suitable pore distribution. UV-vis DRS analysis showed that the absorption intensity of FeOOH/g-C3N4 is stronger than that of g-C3N4. When the catalyst dosage was 1.0 g/L, the H2O2 dosage was 4 mmol/L, the PNP initial concentration was 10 mg/L and the initial pH value was 5, the PNP removal could reach 92% in 120 min. Even after 5 cycles, the efficiency of PNP removal by FeOOH/g-C3N4 remains nearly 80%. The capture experiment indicated that both •OH and •O2− play roles in the photocatalytic degradation of PNP, with •OH being more significant. These findings affirm that FeOOH has been successfully incorporated into g-C3N4, resulting in a conspicuous catalytic effect on the degradation of PNP in the visible light-assisted Fenton-like reaction. Full article
(This article belongs to the Special Issue Heterogeneous Catalysis in Environmental Application)
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16 pages, 6352 KiB  
Article
Effect of Ag Modification on the Structure and Photocatalytic Performance of TiO2/Muscovite Composites
by Fengqiu Qin, Ling Zhang, Yuhao Luo, Lili He, Shiji Lu, Li Xu, Xiaodong Zhu and Wei Feng
Molecules 2023, 28(7), 3187; https://doi.org/10.3390/molecules28073187 - 3 Apr 2023
Cited by 3 | Viewed by 1905
Abstract
Ag/TiO2/muscovite (ATM) composites were prepared by the sol–gel method and the effects of Ag modification on the structure and photocatalytic performance were investigated. The photocatalysts were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller surface [...] Read more.
Ag/TiO2/muscovite (ATM) composites were prepared by the sol–gel method and the effects of Ag modification on the structure and photocatalytic performance were investigated. The photocatalysts were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller surface area (BET), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectra (FTIR), photoluminescence spectra (PL) and ultraviolet–visible diffuse reflectance spectra (DRS). The photocatalytic activity of the obtained composites was evaluated by taking 100 mL (10 mg/L) of Rhodamine B (RhB) aqueous solution as the target pollutant. The muscovite (Mus) loading releases the agglomeration of TiO2 particles and the specific surface area increases from 17.6 m2/g (pure TiO2) to 39.5 m2/g (TiO2/Mus). The first-order reaction rate constant increases from 0.0009 min−1 (pure TiO2) to 0.0074 min−1 (150%TiO2/Mus). Ag element exists in elemental silver. The specific surface area of 1-ATM further increases to 66.5 m2/g. Ag modification promotes the separation of photogenerated electrons and holes and increases the visible light absorption. 1%Ag-TiO2/Mus (1-ATM) exhibits the highest photocatalytic activity. After 100 min, the rhodamine B (RhB) degradation degrees of PT, 150%TiO2/Mus and 1-ATM are 10.4%, 48.6% and 90.6%, respectively. The first-order reaction rate constant of 1-ATM reaches 0.0225 min−1, which is 25 times higher than that of pure TiO2. Full article
(This article belongs to the Special Issue Heterogeneous Catalysis in Environmental Application)
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