1
|
Chen S, Zhang S, Fang L, Yang Y, Zhu C, Dai X, Gong Z, Dong F. Transforming the Poison Effects of Water Vapor into Benefits Over Adjustable Dual Acid Sites for Stable Plasma-Catalysis. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2025:e2502123. [PMID: 40285659 DOI: 10.1002/advs.202502123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2025] [Revised: 03/17/2025] [Indexed: 04/29/2025]
Abstract
Developing a new strategy to address water vapor poisoning is crucial for catalysts in real-working conditions. Except for the traditional thinking of resistance enhancement, a reverse idea is proposed herein of utilizing the inevitable H2O, converting it to active ·OH to enhance the overall performance, with the help of O3 and high energy electrons (e*) in plasma. Dual active sites of Lewis acid (Y3+) and Mn on YxMnyOx+2y catalyst promote the co-adsorption of H2O and O3, and the dissociation of H2O to surface hydroxyl species (*OH). A new OH-accompanied pathway for O3 decomposition is formed and a new intermediate species (*OOH) with a lower energy barrier (0.77 eV lower than traditional *O2 2-) is detected, in which e* in plasma can further accelerate its desorption. Thereafter, abundant active ·OH are generated and work for pollutants degradation, achieving 99.78% ethyl acetate (EA) degradation and 97.36% mineralization rate on the surface of YMO (1:2) under humid environment, with excellent long-term stability. The changed activation site of C─O bond in EA, different by-products, and reaction pathways are also analyzed. This active species regulation strategy transforms the traditional poison effects of water vapor into great benefits, paving the way for broader catalyst applications free of water vapor.
Collapse
Affiliation(s)
- Si Chen
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China
- Huzhou Key Laboratory of Smart and Clean Energy, Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313000, China
| | - Sibo Zhang
- Huzhou Key Laboratory of Smart and Clean Energy, Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313000, China
| | - Lu Fang
- Huzhou Key Laboratory of Smart and Clean Energy, Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313000, China
| | - Yan Yang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, China
| | - Chenyuan Zhu
- Huzhou Key Laboratory of Smart and Clean Energy, Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313000, China
| | - Xinyi Dai
- Huzhou Key Laboratory of Smart and Clean Energy, Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313000, China
| | - Zhengjun Gong
- School of Environmental Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China
| | - Fan Dong
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China
- Huzhou Key Laboratory of Smart and Clean Energy, Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313000, China
| |
Collapse
|
2
|
Fan Z, Zhang S, Cheng S, Feng Z, Lv H, Song H. Investigation into the Performance and Mechanism of BiOX Photocatalytic Degradation of Toluene under Sunlight. ACS OMEGA 2025; 10:15082-15095. [PMID: 40290998 PMCID: PMC12019429 DOI: 10.1021/acsomega.4c10658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2024] [Revised: 02/04/2025] [Accepted: 04/03/2025] [Indexed: 04/30/2025]
Abstract
The existence of indoor volatile organic compound pollution cannot be ignored. The main representative pollutant, toluene, poses a serious danger to human health. In this study, BiOX (X = Cl, Br, I) nanophotocatalytic materials were synthesized using a straightforward chemical precipitation process. The materials' fundamental structure and characteristics were examined, and it was investigated whether they can remove toluene gas pollutants when put them under sunlight. According to the results, within 120 min, the degradation rates of toluene are ranked as BiOCl > BiOI > BiOBr, with BiOBr achieving 16.16%, BiOI 28.13%, and BiOCl exhibiting the highest degradation efficiency at approximately 56.41%. Toluene was entirely broken down with fewer intermediates, according to the conversion rate of CO2, the degradation product. There was also extensive research on the photocatalytic mechanism of BiOCl under sunlight. The π-bonds within the toluene benzene ring were broken by the active radicals •OH and •O2 -. Furthermore, the oxygen vacancies and the holes (h+) worked in concert to enhance the toluene molecule's adsorption and activation, which accelerated the breakdown of toluene into short-chain molecules, and it became carbon dioxide and water, eventually. These reactions were considered to be environmentally and friendly. The study gives a practical way to lessen indoor VOC pollution and theoretical evidence for BiOCl photocatalytic degradation of toluene gas.
Collapse
Affiliation(s)
- Zhenlian Fan
- Institute of Resources and
Environmental Engineering; Shanxi Laboratory for Yellow River; Engineering
Research Center of Resource Efficiency Enhancing and Carbon Emission
Reduction in Yellow River Basin, Ministry of Education of People’s
Republic of China, Shanxi University, Taiyuan 030006, China
| | - Shirui Zhang
- Institute of Resources and
Environmental Engineering; Shanxi Laboratory for Yellow River; Engineering
Research Center of Resource Efficiency Enhancing and Carbon Emission
Reduction in Yellow River Basin, Ministry of Education of People’s
Republic of China, Shanxi University, Taiyuan 030006, China
| | - Shuyan Cheng
- Institute of Resources and
Environmental Engineering; Shanxi Laboratory for Yellow River; Engineering
Research Center of Resource Efficiency Enhancing and Carbon Emission
Reduction in Yellow River Basin, Ministry of Education of People’s
Republic of China, Shanxi University, Taiyuan 030006, China
| | - Zhengjun Feng
- Institute of Resources and
Environmental Engineering; Shanxi Laboratory for Yellow River; Engineering
Research Center of Resource Efficiency Enhancing and Carbon Emission
Reduction in Yellow River Basin, Ministry of Education of People’s
Republic of China, Shanxi University, Taiyuan 030006, China
| | - Hongzhou Lv
- Institute of Resources and
Environmental Engineering; Shanxi Laboratory for Yellow River; Engineering
Research Center of Resource Efficiency Enhancing and Carbon Emission
Reduction in Yellow River Basin, Ministry of Education of People’s
Republic of China, Shanxi University, Taiyuan 030006, China
| | - Huiping Song
- Institute of Resources and
Environmental Engineering; Shanxi Laboratory for Yellow River; Engineering
Research Center of Resource Efficiency Enhancing and Carbon Emission
Reduction in Yellow River Basin, Ministry of Education of People’s
Republic of China, Shanxi University, Taiyuan 030006, China
| |
Collapse
|
3
|
Li L, Jing Y, Zhang J, Guo J. Photocatalytic degradation of NO by MnO 2 catalyst: The decisive relationship between crystal phase, morphology and activity. JOURNAL OF HAZARDOUS MATERIALS 2025; 487:137228. [PMID: 39837031 DOI: 10.1016/j.jhazmat.2025.137228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2024] [Revised: 01/04/2025] [Accepted: 01/14/2025] [Indexed: 01/23/2025]
Abstract
This study investigates the critical relationship between the crystal phase, morphology, and photocatalytic activity of MnO2. The δ-MnO2 nanosheets, characterized by multiple exposed crystal planes forming junctions, exhibit optimized optical and electrical properties. Oxygen vacancy concentrations were observed in the order δ-MnO2 > γ-MnO2 > α-MnO2, with corresponding increases in band gap width from 1.38 eV (δ-MnO₂) to 1.68 eV (α-MnO₂). The δ-MnO2 nanosheets achieved over 80 % NO removal efficiency and effectively suppressed the production of NO2 byproducts, outperforming α-MnO2 nanorods and γ-MnO2 nanospheres. The adsorption energy of O₂ followed the trend δ-MnO2 > γ-MnO2 > α-MnO2, while the adsorption energy of NO was lowest on δ-MnO2, facilitating its interaction with reactive species such as •O2⁻ and •OH. For γ-MnO2, NO directly reacted with •O2⁻. The findings highlight the dependence of MnO2 photocatalytic performance on its crystal phase and morphology, with δ-MnO2 effectively inhibiting photogenerated electron-hole recombination due to its superior properties. This work presents a straightforward approach to designing high-performance transition metal photocatalysts through crystal phase and morphology control, offering valuable insights for future photocatalyst research.
Collapse
Affiliation(s)
- Lingtong Li
- School of Architecture and Environment, Sichuan University, Chengdu, Sichuan 610065, China
| | - Yue Jing
- School of Architecture and Environment, Sichuan University, Chengdu, Sichuan 610065, China
| | - Jianbei Zhang
- School of Architecture and Environment, Sichuan University, Chengdu, Sichuan 610065, China
| | - Jiaxiu Guo
- College of Carbon Neutrality Future Technology, Sichuan University, Chengdu, Sichuan 610065, China; National Engineering Research Center for Flue Gas Desulfurization, Chengdu, Sichuan 610065, China; Industrial Technology Research Institute, Sichuan University, Yibin 644004, China.
| |
Collapse
|
4
|
Zhang W, Ji Y, Zhang J, Zhang H, Chang C, Wang Z. Dual-course dielectric barrier discharge with a novel hollow micro-holes electrode to efficiently mitigate NO x. JOURNAL OF HAZARDOUS MATERIALS 2024; 473:134585. [PMID: 38795477 DOI: 10.1016/j.jhazmat.2024.134585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 04/17/2024] [Accepted: 05/09/2024] [Indexed: 05/28/2024]
Abstract
The effect of a novel hollow annular micro-hole electrode on the DBD de-NOx performance was investigated. The experimental results show that the hollow electrode allows the feed gas to take full advantage of the redundant heat of the electrode, thus reducing the energy consumption of the system. Subsequently, the micro-hole structure can improve the uniformity of feed gas in the plasma channel and prolong the residence time of the feed gas in the plasma channel. The reactor can also raise the temperature of the feed gas and enhance the plasma electric field. The optimum NOx removal efficiency of about 82.6% is achieved at 16 annular micro-holes. Compared to the rod electrode reactor, the novel electrode reactor shows 19.7% reduction in energy consumption and 13.2% enhancement in de-NOx efficiency. The calculations of de-NOx mechanism show that the NO2 concentration decays significantly as the feed gas residence time increases, accompanied by a slight increase in N2O concentration. The NO2 concentration marginally increases while N2O concentration slightly decreases as the increase of feed gas temperature. DBD de-NOx presents the mode of accelerated reduction of NO, essential removal of NO2, and gradual consumption of N2O with the reduced electric field increases.
Collapse
Affiliation(s)
- Wei Zhang
- Dalian Maritime University, Marine Engineering, Dalian, Liaoning 116026, China
| | - Yulong Ji
- Dalian Maritime University, Marine Engineering, Dalian, Liaoning 116026, China.
| | - Jifeng Zhang
- Yangtze Delta Region Institute of Tsinghua University Zhejiang, Jiaxing, Zhejiang 314006, China
| | - Hai Zhang
- Tsinghua University, Energy and Power Engineering, Beijing 100084, China
| | - Chao Chang
- Dalian Maritime University, Marine Engineering, Dalian, Liaoning 116026, China
| | - Zongyu Wang
- Yangtze Delta Region Institute of Tsinghua University Zhejiang, Jiaxing, Zhejiang 314006, China; Tsinghua University, Energy and Power Engineering, Beijing 100084, China.
| |
Collapse
|
5
|
Chen Y, Sun X, Zheng L, Liu Y, Zhao Y, Huang S, Li S. Synergistic catalysis induced by a multi-component system constructed by DBD plasma combined with α-Fe 2O 3/FeVO 4/HCP and peroxymonosulfate for gatifloxacin removal. CHEMOSPHERE 2023; 332:138838. [PMID: 37150453 DOI: 10.1016/j.chemosphere.2023.138838] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 04/30/2023] [Accepted: 05/01/2023] [Indexed: 05/09/2023]
Abstract
The dielectric barrier discharge (DBD) multi-component system containing plasma, α-Fe2O3/FeVO4, and peroxymonosulfate (PMS) with high catalytic activity was successfully constructed. Thereinto, α-Fe2O3/FeVO4 was loaded on the honeycomb ceramic plate (HCP) surface (α-Fe2O3/FeVO4/HCP) and placed under the water surface below the discharge area. The catalytic activity was evaluated by the removal rate of gatifloxacin (GAT), and the DBD+α-Fe2O3/FeVO4+PMS system exhibited the optimal catalytic activity. The enhanced catalytic activity can be attributed to the fact that the occurrence of synergistic catalysis that simultaneously includes plasma oxidation, photocatalysis, PMS oxidation, O3 catalysis, and Fenton reaction. The effect of various initial degradation parameters including input power, PMS dosage, pH, etc. On GAT removal was investigated. DBD+α-Fe2O3/FeVO4+PMS system has a significant increase in the concentration of H2O2 and O3, and the role played in the multi-component system was analyzed. The identification and analysis of organic matters during GAT degradation were visualized with the help of 3D EEMs. HPLC-MS and theoretical calculations identified the major intermediates and further deduced the possible GAT degradation pathways. Additionally, the acute toxicity of the major intermediates was predicted by the QSAR model. Finally, the possible mechanisms of synergistic catalysis to enhance catalytic activity were discussed based on the characteristics of several advanced oxidation processes (AOPs) and the results of experimental and characterization. This work provides a feasible technical route and theoretical basis for wastewater treatment by plasma combined with other AOPs.
Collapse
Affiliation(s)
- Yongyang Chen
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, PR China.
| | - Xiaomin Sun
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China.
| | - Lijiao Zheng
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, PR China.
| | - Yuan Liu
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, PR China.
| | - Yimo Zhao
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, PR China.
| | - Shimeng Huang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, PR China.
| | - Shanping Li
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, PR China.
| |
Collapse
|
6
|
Zhang S, Yi X, Hu G, Chen M, Shen H, Li B, Yang L, Dai W, Zou J, Luo S. Configuration regulation of active sites by accurate doping inducing self-adapting defect for enhanced photocatalytic applications: A review. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
7
|
Zhang Q, Li Y, Li H, Zhang Y, Zhang L, Zhong S, Shu X. Multi-catalysis of glow discharge plasma coupled with FeS 2 for synergistic removal of antibiotic. CHEMOSPHERE 2023; 312:137204. [PMID: 36368535 DOI: 10.1016/j.chemosphere.2022.137204] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Revised: 10/29/2022] [Accepted: 11/07/2022] [Indexed: 06/16/2023]
Abstract
Fe-based composites improved the energy utilization efficiency of plasma for removing contaminants through multi-catalysis have received much attention. However, the energy efficiency and catalytic activity are compromised by the slow transformation from Fe (Ⅲ) to Fe (Ⅱ). Here, given the electron-donating ability of reducing sulfur species, as well as the acidic environment generated by FeS2, single FeS2 was introduced into the glow discharge plasma (GDP) reactor for the removal of tylosin (TYL). The results showed that a significant synergistic effect between FeS2 and GDP improved the energy efficiency of plasma and the removal efficiency of TYL (99.7%). FeS2 boosted the generation of radicals (·OH, ·O2-) and nonradicals (h+, e-) rather than H2O2 and O3, which played an important role in TYL abatement. Moreover, the electrons donating sulfur and iron species from FeS2 can accelerate the conversion of Fe(III) to Fe(II), which was conducive to the generation of radicals. Besides, acid solution self-adjustment resulted from the oxidation of FeS2 improved heterogeneous Fenton reaction, the oxidation potential of ·OH and adsorption of positive charged TYL. The plausible degradation pathways of TYL were proposed in GDP/FeS2 system. In summary, enhanced removal of TYL was mainly attributed to the catalytic pathway altered by FeS2 through high-energy electrons, photocatalysis, heterogeneous Fenton and O3 catalysis in the GDP system simultaneously. The strategy of integrating GDP with FeS2 proposed in this work is expected to offer a feasible and potential technique for organic wastewater treatment.
Collapse
Affiliation(s)
- Qian Zhang
- School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin, Guangxi, 541000, China
| | - Yang Li
- School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin, Guangxi, 541000, China
| | - Hua Li
- School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin, Guangxi, 541000, China.
| | - Yuhan Zhang
- School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin, Guangxi, 541000, China
| | - Lishan Zhang
- School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin, Guangxi, 541000, China
| | - Shan Zhong
- School of Life and Environmental Science, Guilin University of Electronic Technology, Guilin, Guangxi, 541000, China
| | - Xiaohua Shu
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, Guangxi, 541000, China.
| |
Collapse
|
8
|
Boosted photocatalytic efficiency of GQDs sensitized (BiO)2CO3/β-Bi2O3 heterojunction via enhanced interfacial charge transfer. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.107967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
9
|
Guo H, Yang H, Huang J, Tong J, Liu X, Wang Y, Qiao W, Han J. Theoretical and experimental insight into plasma-catalytic degradation of aqueous p-nitrophenol with graphene-ZnO nanoparticles. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121362] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
10
|
He Y, Tan Y, Song M, Tu Q, Fu M, Long L, Wu J, Xu M, Liu X. Switching on photocatalytic NO oxidation and proton reduction of NH 2-MIL-125(Ti) by convenient linker defect engineering. JOURNAL OF HAZARDOUS MATERIALS 2022; 430:128468. [PMID: 35180523 DOI: 10.1016/j.jhazmat.2022.128468] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 02/08/2022] [Accepted: 02/08/2022] [Indexed: 06/14/2023]
Abstract
Photocatalysis technology has been widely adopted to abate typical air pollutants. Nevertheless, developing photocatalysts aimed at improving photocatalytic efficiency is a challenge. Herein, the linker-defect NH2-MIL-125(Ti) photocatalyst was synthesized through a convenient one-step heating-stirring method (just adjusting multiple temperatures) to firstly realize efficient photocatalytic performances of NO removal and hydrogen evolution. The optimal sample (named 65-NMIL) with a linker-defect content of 32.08% exhibited a NO removal ratio of 65.49%, which was 37.57% higher than that of pristine NH2-MIL-125(Ti), and displayed better H2-production activity. Through ESR, it was confirmed that 65-NMIL can generate more •O2- and •OH under visible light, and the radical trapping experiment further proved that •O2- played a more important role in photocatalytic activity. Moreover, the photocatalytic NO oxidation process was also monitored by in situ DRIFTS, it was found that the defective samples could promote the oxidation of NO and intermediates to the final product (NO3-). On the basis of the above-mentioned photocatalytic experimental results and characterization, a possible mechanism or pathway was proposed and illustrated. This work can provide a new strategy for the subsequent defect engineering for photocatalytic MOFs materials to further solve environmental and energy crises.
Collapse
Affiliation(s)
- Youzhou He
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Yuwei Tan
- School of Chemistry and Chemical Engineering, Sichuan University of Arts and Science, Dazhou 635000, Sichuan, China.
| | - Mengyu Song
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Qingli Tu
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Min Fu
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Liangjun Long
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Jie Wu
- National-local Joint Engineering Laboratory for Road Engineering and Disaster Prevention and Mitigation Technology in Mountainous Areas, China Merchants Chongqing Communications Technology Research & Design Institute CO., LTD., Chongqing 400067, China.
| | - Mengmeng Xu
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Xingyan Liu
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China.
| |
Collapse
|
11
|
Chen S, Wang H, Dong F. Activation and characterization of environmental catalysts in plasma-catalysis: Status and challenges. JOURNAL OF HAZARDOUS MATERIALS 2022; 427:128150. [PMID: 34979387 DOI: 10.1016/j.jhazmat.2021.128150] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 12/14/2021] [Accepted: 12/22/2021] [Indexed: 06/14/2023]
Abstract
Plasma-catalysis has attracted great attentions in environmental/energy-related fields, but the synergetic mechanism still suffers intractable defects. Key issues are that what kind of catalysts are applicable for plasma system, how are they activated in plasma, and how to characterize them in plasma. This review systematically gives a comprehensive summarization of the selection of catalysts and its activation mechanism in plasma, based on the character of plasma, including physical effects containing the enhancement of discharge intensity and adsorption of reactants, and the utilization of plasma-generated active species such as·O, heat, O3, ultraviolet light and e* . Focus is given to the illumination of the activation mechanisms of catalysts when placed in plasma zone. Subsequently, the novel characterization techniques for catalysts, which may associate properties to performance, are critically overviewed. The challenges and opportunities for the activation and characterizations of catalysts are proposed, and future perspectives are suggested about where the efforts should be made. It is expected that a bridge between catalysts design and character of plasma can be built to shed light on the synergetic mechanism for plasma-catalysis and design of new plasma-catalysis systems.
Collapse
Affiliation(s)
- Si Chen
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313000, China
| | - Haiqiang Wang
- College of Environmental and Resource Sciences, Zhejiang University, 310058 Hangzhou, China
| | - Fan Dong
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313000, China; Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
| |
Collapse
|
12
|
One-step calcination synthesis of accordion-like MXene-derived TiO2@C coupled with g-C3N4: Z-scheme heterojunction for enhanced photocatalytic NO removal. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.120329] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
13
|
Yang W, Ren Q, Zhong F, Wang Y, Wang J, Chen R, Li J, Dong F. Promotion mechanism of -OH group intercalation for NOx purification on BiOI photocatalyst. NANOSCALE 2021; 13:20601-20608. [PMID: 34874391 DOI: 10.1039/d1nr05363a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Bismuth oxyiodide (BiOI) is a traditional layered oxide photocatalyst that performs in a wide visible-light absorption band, owing to its appropriate band structure. Nevertheless, its photocatalytic efficiency is immensely inhibited due to the serious recombination of photogenerated charge carriers. Herein, this great challenge is addressed via a new strategy of intralayer modification by -OH groups in BiOI, which leads to enhancement of the reactants' activation capacity to promote photocatalytic activity and generate more active species. Furthermore, analysis via a combination of experimental and theoretical methods revealed that the -OH group-functionalized samples reduce the energy barriers for conversion of the main intermediate (NO2), which is easily transformed to NO2-, thus accelerating the oxidation of NO to the final product (NO3-). This study gives insight into NO oxidation, improving the photocatalytic efficiency, and mastering the photocatalysis reaction mechanism to curb air pollution.
Collapse
Affiliation(s)
- Weiping Yang
- Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Qin Ren
- Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Fengyi Zhong
- Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Yanxia Wang
- Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Jielin Wang
- Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Ruimin Chen
- Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Jieyuan Li
- Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313000, China
| | - Fan Dong
- Research Center for Environmental and Energy Catalysis, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou 313000, China
| |
Collapse
|
14
|
Yang L, Yu Y, Yang W, Li X, Zhang G, Shen Y, Dong F, Sun Y. Efficient visible light photocatalytic NO abatement over SrSn(OH) 6 nanowires loaded with Ag/Ag 2O cocatalyst. ENVIRONMENTAL RESEARCH 2021; 201:111521. [PMID: 34214565 DOI: 10.1016/j.envres.2021.111521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 05/17/2021] [Accepted: 06/08/2021] [Indexed: 06/13/2023]
Abstract
SrSn(OH)6 (SSOH) possesses a high oxidation potential in the valence band (VB), which is suitable for photocatalytic oxidation removal of pollutants. However, the electrons in the VB of these catalysts are difficult to transition to the conduction band (CB) under visible light, which makes it difficult to utilize sunlight effectively. In this work, Ag/Ag2O is loaded on the surface of SSOH nanowires, which stimulates the interfacial charge-transfer transition on SSOH. Compared with pure-phase SSOH, the NO abatement ratio of Ag/Ag2O-SSOH under visible light irradiation is increased to 45.10%. The e- in the VB of Ag2O are excited into the CB under visible light, and are further transferred to the Ag to react with O2 to produce superoxide radicals. The photo-excited e- in the VB of SSOH enter into the VB of Ag2O through interfacial charge-transfer transition to recombine with the photo-generated holes in the VB of Ag2O, thereby leaving photo-generated holes in the VB of SSOH. The holes in the VB of SSOH have sufficient oxidizing ability to oxidize the adsorbed hydroxyl groups into hydroxyl radicals. This work provides a new perspective for photocatalytic removal of pollutants by wide band gap photocatalyst under visible light.
Collapse
Affiliation(s)
- Lin Yang
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing, 400067, China
| | - Yangyang Yu
- Yangtze Delta Region Institute (Huzhou) & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Huzhou, 313001, China.
| | - Wenjia Yang
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing, 400067, China
| | - Xiaofang Li
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing, 400067, China
| | - Guo Zhang
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing, 400067, China
| | - Yu Shen
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing, 400067, China
| | - Fan Dong
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing, 400067, China; Yangtze Delta Region Institute (Huzhou) & Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Huzhou, 313001, China; State Centre for International Cooperation on Designer Low Carbon and Environmental Materials (CDLCEM), School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Yanjuan Sun
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing, 400067, China; Yangtze Delta Region Institute (Huzhou) & School of Resources and Environment, University of Electronic Science and Technology of China, Huzhou, 313001, China.
| |
Collapse
|
15
|
Yang X, Qu J, Wang L, Luo J. In-plasma-catalysis for NO x degradation by Ti 3+ self-doped TiO 2-x /γ-Al 2O 3 catalyst and nonthermal plasma. RSC Adv 2021; 11:24144-24155. [PMID: 35479043 PMCID: PMC9036666 DOI: 10.1039/d1ra02847b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 06/30/2021] [Indexed: 01/14/2023] Open
Abstract
In an attempt to realize the efficient treatment of NOx, a mixed catalyst of Ti3+ self-doped TiO2−x and γ-Al2O3 was constructed by reducing commercial TiO2. The degradation effect on NOx was evaluated by introducing the mixed catalyst into a coaxial dual-dielectric barrier reactor. It was found that the synthesized TiO2−x could achieve considerable degradation effects (84.84%, SIE = 401.27 J L−1) in a plasma catalytic system under oxygen-rich conditions, which were better than those of TiO2 (73.99%) or a single plasma degradation process (26.00%). The presence of Ti3+ and oxygen vacancies in TiO2−x resulted in a relatively narrow band gap, which contributed to catalyzing deeply the oxidation of NOx to NO2− and NO3− during the plasma-induced “pseudo-photocatalysis” process. Meanwhile, the TiO2−x showed an improved discharge current and promoted discharge efficiency, explaining its significant activation effect in the reaction. Reduced TiO2−x could achieve an impressive degradation effect in a long-time plasma-catalysis process, and still maintained its intrinsic crystal structure and morphology. This work provides a facile synthesis procedure for preparing Ti3+ self-doped TiO2−x with practical and scalable production potential; moreover, the novel combination with plasma also provides new insights into the low-temperature degradation of NOx. TiO2−x has a smaller forbidden band width, more abundant Ti3+ and oxygen vacancies, so as to obtain a better and more stable degradation effect of NOx in plasma-catalysis process.![]()
Collapse
Affiliation(s)
- Xingdong Yang
- Department of Chemical Engineering, Sichuan University Chengdu Sichuan 610065 P.R. China
| | - Jiyan Qu
- Department of Chemical Engineering, Sichuan University Chengdu Sichuan 610065 P.R. China
| | - Linxi Wang
- Department of Chemical Engineering, Sichuan University Chengdu Sichuan 610065 P.R. China
| | - Jianhong Luo
- Department of Chemical Engineering, Sichuan University Chengdu Sichuan 610065 P.R. China
| |
Collapse
|
16
|
Tan Y, Wei S, Liu X, Pan B, Liu S, Wu J, Fu M, Jia Y, He Y. Neodymium oxide (Nd 2O 3) coupled tubular g-C 3N 4, an efficient dual-function catalyst for photocatalytic hydrogen production and NO removal. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 773:145583. [PMID: 33582359 DOI: 10.1016/j.scitotenv.2021.145583] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 01/29/2021] [Accepted: 01/29/2021] [Indexed: 06/12/2023]
Abstract
Graphitic carbon nitride (g-C3N4) has emerged as a most promising photocatalyst, non-toxicity and low density, but it is plagued by low activity due to the small specific surface area and poor quantum efficiency. Morphological engineering and coupling with other materials to form hybrids have proven to be effective strategies for enabling high photocatalytic performances. Here, neodymium oxide (Nd2O3) coupled tubular g-C3N4 composites had been facilely synthesized by a solvent evaporation and high-temperature calcination method to realize efficient photocatalytic activity of hydrogen production and NO removal. A series of characterizations, such as XRD, ESR, in-situ DRIFTS, etc., were used to analyze the physical and chemical properties of the bifunctional photocatalyst, which demonstrated that the composite material had more active sites and a faster electron transfer rate. The optimal sample (1 wt% Nd2O3/CN-T) had a H2 generation rate of 4355.34 μmol·g-1·h-1, which was 9.46 times than that of original g-C3N4 obtained through heating melamine (CN-M). In addition, the NO removal rate was also 32.32% higher than that of original CN-M. On the basis of the above photocatalytic experimental results and characterizations, a possible mechanism or pathway was proposed and illustrated. This work could provide a feasible strategy to fabricate tubular g-C3N4-based composites with rare earth metal oxides (dual-factor regulation) to simultaneously enhance photocatalytic hydrogen production and NO removal efficiently (double application).
Collapse
Affiliation(s)
- Yuwei Tan
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Siping Wei
- Department of Medicinal Chemistry, School of Pharmacy, Southwest Medical University, Luzhou 646000, China
| | - Xingyan Liu
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China.
| | - Baoyu Pan
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Shike Liu
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Jie Wu
- National-local Joint Engineering Laboratory for Road Engineering and Disaster Prevention and Mitigation Technology in Mountainous Areas, China Merchants Chongqing Communications Technology Research & Design Institute CO., LTD., Chongqing 400067, China.
| | - Min Fu
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Yiming Jia
- Department of Chemistry "G. Ciamician", University of Bologna, Ravenna Campus, 48121 Ravenna, Italy
| | - Youzhou He
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China.
| |
Collapse
|
17
|
Cheng Z, Qu M, Chen D, Chen J, Yu J, Zhang S, Ye J, Hu J, Wang J. Mechanisms of Active Substances in a Dielectric Barrier Discharge Reactor: Species Determination, Interaction Analysis, and Contribution to Chlorobenzene Removal. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:3956-3966. [PMID: 33629580 DOI: 10.1021/acs.est.0c04914] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Several typical active substances (•NO, •NO2, H2O2, O3, •OH, and O2-•), directly or indirectly play dominant roles during dielectric barrier discharge (DBD) reaction. This study measured these active substances and removed them by using radical scavengers, such as catalase, superoxide dismutase, carboxy-PTIO (c-PTIO), tert-butanol (TBA), and MnO2 in different reaction atmospheres (air, N2, and O2). The mechanism for chlorobenzene (CB) removal by plasma in air atmosphere was also investigated. The production of O═NOO-• generated by •NO took around 75% of the total production of O═NOO-•. Removing •NO increased the O3 amount by about 80% likely because of the mutual inhibition between O3 and reactive nitrogen species in or out of the discharge area. The quantitative comparison of •OH and H2O2 revealed that the formation of •OH was 3.06-4.65 times that of H2O2 in these reaction atmospheres. Calculation results showed that approximately 1.61% of H2O was used for O3 generation. Ionization patterns affected the form of solid deposits during the removal of CB in N2 and O2 atmospheres caused by Penning ionization and thermal radiation tendencies, respectively. Correlation analysis results suggested the macroscopic synergistic or inhibitory effects happened among these active substances. A zero-dimensional reaction kinetics model was adopted to analyze the reactions during the formation of active substances in DBD, and the results showed good consistency with experiments. The interactions of each active substance were clarified. Finally, a response surface method model was developed to predict CB removal by the DBD plasma process. Stepwise regression analysis results showed that CB removal was affected by the contents of different active substances in air, N2 atmosphere, and O2 atmosphere, respectively: O2-•, •OH, and O3; H2O2, O═NOO-•, and O3; •OH and O3.
Collapse
Affiliation(s)
- Zhuowei Cheng
- College of Environment, Zhejiang University of Technology, Hangzhou 310009, China
| | - Miaomiao Qu
- College of Environment, Zhejiang University of Technology, Hangzhou 310009, China
| | - Dongzhi Chen
- School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan 316004, China
| | - Jianmeng Chen
- College of Environment, Zhejiang University of Technology, Hangzhou 310009, China
- School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan 316004, China
| | - Jianming Yu
- College of Environment, Zhejiang University of Technology, Hangzhou 310009, China
| | - Shihan Zhang
- College of Environment, Zhejiang University of Technology, Hangzhou 310009, China
| | - Jiexu Ye
- College of Environment, Zhejiang University of Technology, Hangzhou 310009, China
| | - Jun Hu
- College of Environment, Zhejiang University of Technology, Hangzhou 310009, China
| | - Jiade Wang
- College of Environment, Zhejiang University of Technology, Hangzhou 310009, China
| |
Collapse
|
18
|
Duan L, Rao S, Wang D, Zhang K, Cao H, Liu Z, Guo Q, Li W, Tao J, Gao Y. Understanding of TiO 2 catalysis mechanism in underwater pulsed discharge system: Charge carrier generation and interfacial charge-transfer processes. CHEMOSPHERE 2021; 267:129249. [PMID: 33352369 DOI: 10.1016/j.chemosphere.2020.129249] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 12/02/2020] [Accepted: 12/05/2020] [Indexed: 06/12/2023]
Abstract
Compared with traditional photocatalysis system, TiO2 charge carrier generation and interfacial charge-transfer process may be influenced by various chemical and physical effects in underwater pulsed discharge plasma system. Here, the role of high-energy electron, ozone in TiO2 charge carrier generation and transfer process has been investigated using phenol as the probe molecule. The introduction of electron-trapping agent (KH2PO4) have an inhibiting effect on TiO2 catalytic activity, indicating high-energy electrons played a significant role in TiO2 catalytic process. EPR analysis showed that TiO2 could be activated to initiate pairs of electron-hole by high-energy electrons from plasma, and the electrons on the conduction band (CB) could be trapped on the oxygen vacancies. XPS analysis showed that the Ti3+OH species formed during discharge process due to the capture of CB electrons by Ti4+OH groups located at the TiO2 surface. The CB electrons transfer processes on TiO2 surface was strongly dependent on the redox potential of electron acceptors, which adsorbed on the TiO2 surface. The CB electrons can be transferred to dissolved O3, resulting in more OH production. Meanwhile, the CB electron also transferred to benzoquinone adsorbed on TiO2, resulting in accumulation of hydroquinone.
Collapse
Affiliation(s)
- Lijuan Duan
- Guangdong Research Institute of Rare-Metal, Guangdong Academy of Science, Guangzhou, 510650, China; State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou, 510650, China; School of Electrical Engineering, Dalian University of Technology, Dalian, 116024, China.
| | - Shuai Rao
- Guangdong Research Institute of Rare-Metal, Guangdong Academy of Science, Guangzhou, 510650, China; State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou, 510650, China
| | - Dongxing Wang
- Guangdong Research Institute of Rare-Metal, Guangdong Academy of Science, Guangzhou, 510650, China; State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou, 510650, China
| | - Kuifang Zhang
- Guangdong Research Institute of Rare-Metal, Guangdong Academy of Science, Guangzhou, 510650, China; State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou, 510650, China
| | - Hongyang Cao
- Guangdong Research Institute of Rare-Metal, Guangdong Academy of Science, Guangzhou, 510650, China; State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou, 510650, China
| | - Zhiqiang Liu
- Guangdong Research Institute of Rare-Metal, Guangdong Academy of Science, Guangzhou, 510650, China; State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou, 510650, China
| | - Qiusong Guo
- Guangdong Research Institute of Rare-Metal, Guangdong Academy of Science, Guangzhou, 510650, China; State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou, 510650, China
| | - Wei Li
- Guangdong Research Institute of Rare-Metal, Guangdong Academy of Science, Guangzhou, 510650, China; State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou, 510650, China
| | - Jinzhang Tao
- Guangdong Research Institute of Rare-Metal, Guangdong Academy of Science, Guangzhou, 510650, China; State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou, 510650, China
| | - Yuan Gao
- Guangdong Research Institute of Rare-Metal, Guangdong Academy of Science, Guangzhou, 510650, China; State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals, Guangzhou, 510650, China
| |
Collapse
|
19
|
Guo H, Li Z, Xiang L, Jiang N, Zhang Y, Wang H, Li J. Efficient removal of antibiotic thiamphenicol by pulsed discharge plasma coupled with complex catalysis using graphene-WO 3-Fe 3O 4 nanocomposites. JOURNAL OF HAZARDOUS MATERIALS 2021; 403:123673. [PMID: 32829229 DOI: 10.1016/j.jhazmat.2020.123673] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/02/2020] [Accepted: 08/07/2020] [Indexed: 06/11/2023]
Abstract
Pulsed discharge plasma (PDP) induced complex catalysis for synergetic removal of thiamphenicol (TAP) was investigated using graphene-WO3-Fe3O4 nanocomposites. The prepared samples were characterized systematically in view of the structure and morphology, chemical bonding state, optical property, electrochemical property and magnetic property. Based on characterization and TAP degradation, the catalytic performance followed: graphene-WO3-Fe3O4>graphene-WO3>WO3, and the highest removal efficiency and kinetic constant could reached 99.3% and 0.070 min-1, respectively. With increase of catalyst dosage, the removal efficiency firstly enhanced and then declined. Lower pH value was beneficial for TAP degradation. The prepared graphene-WO3-Fe3O4 owed higher stability and lower dissolution rate of iron ion. The rGO-WO3-Fe3O4 could decompose O3 and H2O2 into more ·OH in PDP system. The degradation intermediates were characterized by fluorescence spectrograph, LC-MS and IC. Based on the detected intermediates and discrete Fourier transform (DFT) analysis, degradation pathway of TAP was proposed. Besides, the toxicity of intermediates was predicted. Finally, catalytic degradation mechanism of TAP by PDP with graphene-WO3-Fe3O4 was summarized.
Collapse
Affiliation(s)
- He Guo
- College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China.
| | - Zhen Li
- College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Liangrui Xiang
- College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
| | - Nan Jiang
- School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Ying Zhang
- College of Information Science and Technology, Nanjing Forestry University, Nanjing 210037, China
| | - Huijuan Wang
- School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Jie Li
- School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China.
| |
Collapse
|
20
|
Non-Thermal Plasma Coupled with Catalyst for the Degradation of Water Pollutants: A Review. Catalysts 2020. [DOI: 10.3390/catal10121438] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Non-thermal plasma is one of the most promising technologies used for the degradation of hazardous pollutants in wastewater. Recent studies evidenced that various operating parameters influence the yield of the Non-Thermal Plasma (NTP)-based processes. In particular, the presence of a catalyst, suitably placed in the NTP reactor, induces a significant increase in process performance with respect to NTP alone. For this purpose, several researchers have studied the ability of NTP coupled to catalysts for the removal of different kind of pollutants in aqueous solution. It is clear that it is still complicated to define an optimal condition that can be suitable for all types of contaminants as well as for the various types of catalysts used in this context. However, it was highlighted that the operational parameters play a fundamental role. However, it is often difficult to understand the effect that plasma can induce on the catalyst and on the production of the oxidizing species most responsible for the degradation of contaminants. For this reason, the aim of this review is to summarize catalytic formulations coupled with non-thermal plasma technology for water pollutants removal. In particular, the reactor configuration to be adopted when NTP was coupled with a catalyst was presented, as well as the position of the catalyst in the reactor and the role of the main oxidizing species. Furthermore, in this review, a comparison in terms of degradation and mineralization efficiency was made for the different cases studied.
Collapse
|
21
|
Chen S, Zhou Y, Li J, Hu Z, Dong F, Hu Y, Wang H, Wang L, Ostrikov KK, Wu Z. Single-Atom Ru-Implanted Metal–Organic Framework/MnO2 for the Highly Selective Oxidation of NOx by Plasma Activation. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02001] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Si Chen
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental & Resources Science, Zhejiang University, Hangzhou 310058, P. R. China
- Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310027, P. R. China
| | - Yi Zhou
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental & Resources Science, Zhejiang University, Hangzhou 310058, P. R. China
- Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310027, P. R. China
| | - Jieyuan Li
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
| | - Zhaodong Hu
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental & Resources Science, Zhejiang University, Hangzhou 310058, P. R. China
- Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310027, P. R. China
| | - Fan Dong
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
| | - Yuxiang Hu
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Haiqiang Wang
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental & Resources Science, Zhejiang University, Hangzhou 310058, P. R. China
- Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310027, P. R. China
| | - Lianzhou Wang
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Kostya Ken Ostrikov
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology (QUT), Brisbane, Queensland 4000, Australia
| | - Zhongbiao Wu
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental & Resources Science, Zhejiang University, Hangzhou 310058, P. R. China
- Zhejiang Provincial Engineering Research Center of Industrial Boiler & Furnace Flue Gas Pollution Control, Hangzhou 310027, P. R. China
| |
Collapse
|
22
|
Lei B, Cui W, Sheng J, Wang H, Chen P, Li J, Sun Y, Dong F. Synergistic effects of crystal structure and oxygen vacancy on Bi 2O 3 polymorphs: intermediates activation, photocatalytic reaction efficiency, and conversion pathway. Sci Bull (Beijing) 2020; 65:467-476. [PMID: 36747436 DOI: 10.1016/j.scib.2020.01.007] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 12/04/2019] [Accepted: 12/09/2019] [Indexed: 02/08/2023]
Abstract
This work unraveled the synergistic effects of crystal structure and oxygen vacancy on the photocatalytic activity of Bi2O3 polymorphs at an atomic level for the first time. The artificial oxygen vacancy is introduced into α-Bi2O3 and β-Bi2O3 via a facile method to engineer the band structures and transportation of carriers and redox reaction for highly enhanced photocatalysis. After the optimization, the photocatalytic NO removal ratio on defective β-Bi2O3 was increased from 25.2% to 52.0% under visible light irradiation. On defective α-Bi2O3, the NO removal ratio is just increased from 7.3% to 20.1%. The difference in the activity enhancement is associated with the different structure of crystal phase and oxygen vacancy. The density functional theory (DFT) calculation and experimental results confirm that the oxygen vacancy in α-Bi2O3 and β-Bi2O3 could promote the activation of reactants and intermediate as active centers. The crystal structure and oxygen vacancy could synergistically regulate the electrons transfer pathway. On defective β-Bi2O3 with tunnel structure, the reactants activation and charge transfer were more efficient than that on α-Bi2O3 with zigzag-type configuration because the defect structures on the surface of α-Bi2O3 and β-Bi2O3 were different. Moreover, the in situ FT-IR revealed the mechanisms of photocatalytic NO oxidation. The photocatalytic NO conversion pathway on α-Bi2O3 and β-Bi2O3 can be tuned by the different surface defect structures. This work could provide a novel strategy to regulate the photocatalytic activity and conversion pathway via the synergistic effects of crystal structure and oxygen vacancy.
Collapse
Affiliation(s)
- Ben Lei
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Wen Cui
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; The Center of New Energy Materials and Technology, School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China
| | - Jianping Sheng
- Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Hong Wang
- Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Peng Chen
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; The Center of New Energy Materials and Technology, School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China
| | - Jieyuan Li
- College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Yanjuan Sun
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Fan Dong
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China; Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
| |
Collapse
|
23
|
Wu H, Chen R, Wang H, Cui W, Li J, Wang J, Yuan C, Zhuo L, Zhang Y, Dong F. An atomic insight into BiOBr/La2Ti2O7 p–n heterojunctions: interfacial charge transfer pathway and photocatalysis mechanism. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02230a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Mechanisms of the enhancement photocatalytic activity of p–n heterojunction BiOBr/La2Ti2O7 and photocatalytic NO oxidation are proposed.
Collapse
|
24
|
Ran M, Wang H, Cui W, Li J, Chen P, Sun Y, Sheng J, Zhou Y, Zhang Y, Dong F. Light-Induced Generation and Regeneration of Oxygen Vacancies in BiSbO 4 for Sustainable Visible Light Photocatalysis. ACS APPLIED MATERIALS & INTERFACES 2019; 11:47984-47991. [PMID: 31802653 DOI: 10.1021/acsami.9b18154] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Oxygen vacancy (OV)-containing semiconductor photocatalysts have been extensively studied and applied in environmental and energy fields, but there are a few studies concerning the mechanisms of inactivation and regeneration of OVs to prevent the catalysts from deactivation. In this paper, we put forward a novel in situ method to introduce the OVs into BiSbO4 (BiSbO4-OV) via UV-light-induced breaking down of Bi-O and Sb-O bonds. The formation of OVs could broaden the photoresponse range and improve the charge carrier separation as confirmed by density functional theory calculation and UV and photoluminescence spectroscopy. The unique electronic structure of OVs endowed BiSbO4 with high visible light photocatalytic NO activity. It was significant to reveal that oxygen in the air could fill the OV sites during the photocatalytic reaction and the consumption of the OVs led to the direct deactivation of BiSbO4-OV. By re-irradiation of the deactivated photocatalysts, BiSbO4-OV could get back to its initial state, realizing the refreshment of OVs for sustainable photocatalysis. Additionally, the visible light photocatalytic NO conversion pathway on BiSbO4-OV was uncovered via in situ diffuse reflectance infrared Fourier transform spectroscopy based on the identification of the reaction intermediates and products. The light-induced generation and regeneration of OVs could also be extended to other semiconductors for sustainable visible light photocatalysis.
Collapse
Affiliation(s)
- Maoxi Ran
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources , Chongqing Technology and Business University , Chongqing 400067 , China
- Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences , University of Electronic Science and Technology of China , Chengdu 611731 , China
| | - Hong Wang
- Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences , University of Electronic Science and Technology of China , Chengdu 611731 , China
| | - Wen Cui
- Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences , University of Electronic Science and Technology of China , Chengdu 611731 , China
- The Center of New Energy Materials and Technology, School of Materials Science and Engineering , Southwest Petroleum University , Chengdu 610500 , China
| | - Jieyuan Li
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources , Chongqing Technology and Business University , Chongqing 400067 , China
| | - Peng Chen
- Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences , University of Electronic Science and Technology of China , Chengdu 611731 , China
- The Center of New Energy Materials and Technology, School of Materials Science and Engineering , Southwest Petroleum University , Chengdu 610500 , China
| | - Yanjuan Sun
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources , Chongqing Technology and Business University , Chongqing 400067 , China
- Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences , University of Electronic Science and Technology of China , Chengdu 611731 , China
| | - Jianping Sheng
- Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences , University of Electronic Science and Technology of China , Chengdu 611731 , China
| | - Ying Zhou
- The Center of New Energy Materials and Technology, School of Materials Science and Engineering , Southwest Petroleum University , Chengdu 610500 , China
| | - Yuxin Zhang
- College of Materials Science and Engineering , Chongqing University , Chongqing 400044 , China
| | - Fan Dong
- Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources , Chongqing Technology and Business University , Chongqing 400067 , China
- Research Center for Environmental Science & Technology, Institute of Fundamental and Frontier Sciences , University of Electronic Science and Technology of China , Chengdu 611731 , China
| |
Collapse
|
25
|
Xiao S, Wan Z, Zhou J, Li H, Zhang H, Su C, Chen W, Li G, Zhang D, Li H. Gas-Phase Photoelectrocatalysis for Breaking Down Nitric Oxide. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:7145-7154. [PMID: 31067039 DOI: 10.1021/acs.est.9b00986] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Photoelectrocatalysis (PEC) produces high-efficiency electron-hole separation by applying a bias voltage between semiconductor-based electrodes to achieve high photocatalytic reaction rates. However, using PEC to treat polluted gas in a gas-phase reaction is difficult because of the lack of a conductive medium. Herein, we report an efficient PEC system to oxidize NO gas by using parallel photoactive composites (TiO2 nanoribbons-carbon nanotubes) coated on stainless-steel mesh as photoanodes in a gas-phase chamber and Pt foil as the working electrode in a liquid-phase auxiliary cell. Carbon nanotubes (CNTs) were utilized as conductive scaffolds to enhance the interaction between TiO2 and stainless-steel skeletons for accelerated photogenerated electron transfer. Such a PEC system exhibited super-high performance for the treatment of indoor NO gas (550 ppb) with high selectivity for nitrate under UV-light irradiation owing to the conductive, intertwined network structure of the photoanode, fast photocarrier separation, and longer photogenerated hole lifetime. The photogenerated holes were proven to be the most important active sites for directly driving PEC oxidation of indoor NO gas, even in the absence of water vapor. This work created an efficient PEC air-purification filter for treating indoor polluted air under ambient conditions.
Collapse
Affiliation(s)
- Shuning Xiao
- International Joint Laboratory of Resource Chemistry SHNU-NUS-PU, Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials , Shanghai Normal University , Shanghai , 200234 PRC
- SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, College of Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 PRC
- Department of Chemistry and Physics , National University of Singapore , 3 Science Drive 3 , 117543 Singapore
| | - Zhe Wan
- International Joint Laboratory of Resource Chemistry SHNU-NUS-PU, Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials , Shanghai Normal University , Shanghai , 200234 PRC
| | - Jiachen Zhou
- International Joint Laboratory of Resource Chemistry SHNU-NUS-PU, Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials , Shanghai Normal University , Shanghai , 200234 PRC
| | - Han Li
- International Joint Laboratory of Resource Chemistry SHNU-NUS-PU, Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials , Shanghai Normal University , Shanghai , 200234 PRC
| | - Huiqiang Zhang
- International Joint Laboratory of Resource Chemistry SHNU-NUS-PU, Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials , Shanghai Normal University , Shanghai , 200234 PRC
| | - Chenliang Su
- SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, College of Optoelectronic Engineering , Shenzhen University , Shenzhen , 518060 PRC
| | - Wei Chen
- Department of Chemistry and Physics , National University of Singapore , 3 Science Drive 3 , 117543 Singapore
| | - Guisheng Li
- International Joint Laboratory of Resource Chemistry SHNU-NUS-PU, Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials , Shanghai Normal University , Shanghai , 200234 PRC
| | - Dieqing Zhang
- International Joint Laboratory of Resource Chemistry SHNU-NUS-PU, Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials , Shanghai Normal University , Shanghai , 200234 PRC
| | - Hexing Li
- International Joint Laboratory of Resource Chemistry SHNU-NUS-PU, Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials , Shanghai Normal University , Shanghai , 200234 PRC
- Shanghai University of Electric Power , 2588 Changyang Road , Shanghai , 200090 PRC
| |
Collapse
|
26
|
Guo H, Jiang N, Wang H, Lu N, Shang K, Li J, Wu Y. Degradation of antibiotic chloramphenicol in water by pulsed discharge plasma combined with TiO 2/WO 3 composites: mechanism and degradation pathway. JOURNAL OF HAZARDOUS MATERIALS 2019; 371:666-676. [PMID: 30889463 DOI: 10.1016/j.jhazmat.2019.03.051] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 03/04/2019] [Accepted: 03/11/2019] [Indexed: 06/09/2023]
Abstract
Pulsed discharge plasma (PDP) combined with TiO2/WO3 composites for chloramphenicol (CAP) degradation was investigated. The prepared TiO2/WO3 composites were characterized by scanning electron microscope, transmission electron microscope, nitrogen adsorption apparatus, zeta sizer, X-ray diffraction, Raman spectra, UV-Vis absorption spectroscopy, X-ray photoelectron spectroscopy, photocurrent and electrochemical impedance spectroscopy. The degradation performance showed that the addition of TiO2/WO3 composites significantly enhanced the removal efficiency of CAP in PDP system. At a peak voltage of 18 kV, the highest removal efficiency of CAP could reach 88.1% in PDP system with 4 wt% TiO2/WO3, which was 36.8% and 26.0% higher than that in sole PDP system and PDP/TiO2 system, respectively. The TiO2/WO3 composites significantly accelerated interfacial charge transfer process compared to the pure TiO2. Besides, the effect of catalyst dosage and peak voltage on CAP removal was evaluated. OH, O3O2-, h+ and high-energy electrons contributed to CAP degradation in PDP-TiO2/WO3 system. Addition of TiO2/WO3 composites can decompose O3 and produce more OH and H2O2. The degradation intermediates were measured by liquid chromatography-mass spectrometry (LC-MS) and ion chromatography (IC). The cycling degradation experiment showed that the TiO2/WO3 composites have good reusability as well as stability.
Collapse
Affiliation(s)
- He Guo
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Nan Jiang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China.
| | - Huijuan Wang
- School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Na Lu
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Kefeng Shang
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Jie Li
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Yan Wu
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian University of Technology, Dalian 116024, China; School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China; School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
| |
Collapse
|
27
|
Erme K, Jõgi I. Metal Oxides as Catalysts and Adsorbents in Ozone Oxidation of NO x. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:5266-5271. [PMID: 30964660 DOI: 10.1021/acs.est.8b07307] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
NO x represents an important group of pollutants that are formed in fuel combustion. As these pollutants cause significant environmental problems, removal of NO x from exhaust gases is necessary. The present study investigated the influence of metal oxide powders on the removal of NO x by oxidation with ozone. The aim of the study was to compare the catalytic effect of TiO2, Al2O3, and Fe2O3 and to investigate the dependence of the effective rate constant on temperature. NO (400 ppm) and a variable concentration of ozone in a mixture of N2 and O2 was directed through the catalyst chamber and heated to 60-140 °C. The addition of metal oxides resulted in a significant increase in the efficiency of the oxidation of NO to N2O5. Fe2O3 had the largest effect with a maximum of an approximately 3-fold increase in the effective rate constant at 100 °C. At the same time Fe2O3 had the lowest NO x adsorption capacity. In the case of all metal oxides, oxidation of NO to N2O5 caused an abrupt increase in adsorption of NO x.
Collapse
Affiliation(s)
- Kalev Erme
- Institute of Physics , University of Tartu , W. Ostwald Str. 1 , 50411 Tartu , Estonia
| | - Indrek Jõgi
- Institute of Physics , University of Tartu , W. Ostwald Str. 1 , 50411 Tartu , Estonia
| |
Collapse
|
28
|
Ye H, Liu Y, Chen S, Wang H, Liu Z, Wu Z. Synergetic effect between non-thermal plasma and photocatalytic oxidation on the degradation of gas-phase toluene: Role of ozone. CHINESE JOURNAL OF CATALYSIS 2019. [DOI: 10.1016/s1872-2067(18)63185-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|