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Dai W, Zhang B, Ji J, Zhu T, Liu B, Gan Y, Xiao F, Zhang J, Huang H. Efficient Ozone Elimination Over MnO 2 via Double Moisture-Resistance Protection of Active Carbon and CeO 2. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:12091-12100. [PMID: 38916160 DOI: 10.1021/acs.est.4c02482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
The widespread ozone (O3) pollution is extremely hazardous to human health and ecosystems. Catalytic decomposition into O2 is the most promising method to eliminate ambient O3, while the fast deactivation of catalysts under humid conditions remains the primary challenge for their application. Herein, we elaborately developed a splendidly active and stable Mn-based catalyst with double hydrophobic protection of active carbon (AC) and CeO2 (CeMn@AC), which possessed abundant interfacial oxygen vacancies and excellent desorption of peroxide intermediates (O22-). Under extremely humid (RH = 90%) conditions and a high space velocity of 1200 L h-1 g-1, the optimized CeMn@AC achieved nearly 100% O3 conversion (140 h) at 5 ppm, showing unprecedented catalytic activity and moisture resistance toward O3 decomposition. In situ DRIFTS and theory calculations confirmed that the exceptional moisture resistance of CeMn@AC was ascribed to the double protection effect of AC and CeO2, which cooperatively prevented the competitive adsorption of H2O molecules and their accumulation on the active sites of MnO2. AC provided a hydrophobic reaction environment, and CeO2 further alleviated moisture deterioration of the MnO2 particles exposed on the catalyst surface via the moisture-resistant oxygen vacancies of MnO2-CeO2 crystal boundaries. This work offers a simple and efficient strategy for designing moisture-resistant materials and facilitates the practical application of the O3 decomposition catalysts in various environments.
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Affiliation(s)
- Wenjing Dai
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Boge Zhang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Jian Ji
- Institute of Chemical Engineering, Guangdong Academy of Sciences, Guangzhou 510665, China
| | - Tianle Zhu
- School of Space and Environment, Beihang Universtiy, Beijing 100191, China
| | - Biyuan Liu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Yanling Gan
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Fei Xiao
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Jiarui Zhang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
| | - Haibao Huang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
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2
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Song Y, Shin MJ, Kwon BC, So J, Kim YJ, Kang D, Park NK, Kim M. Synergistic effects of copper and oxygen vacancies in enhancing the efficacy of partially crystalline CuMnxOy catalyst for ozone decomposition. J Chem Phys 2024; 160:234706. [PMID: 38888374 DOI: 10.1063/5.0212226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2024] [Accepted: 06/03/2024] [Indexed: 06/20/2024] Open
Abstract
To tackle the challenge of ground-level ozone pollution, this study proposed a potential catalytic design approach for ozone decomposition using Cu-Mn bimetallic oxide. This approach is grounded in an understanding of the intrinsic reactivity for catalyst and incorporates a novel potassium-driven low-temperature oxidation process for catalyst synthesis. The research highlights the creation of a highly reactive Cu-Mn oxide phase with extensive defect coverage, leading to significantly increased reaction rates. It also identifies the MnO2(100) facet as a crucial active phase, where oxygen vacancies simultaneously enhance O3 adsorption and decomposition, albeit with a concurrent risk of O2 poisoning due to the stabilization of adsorbed O2. Crucially, the incorporation of Cu offsets the effects of oxygen vacancies, influencing conversion rates and lessening O2 poisoning. The synergistic interplay between Cu and oxygen vacancies elevates the performance of the defect-rich Cu-Mn oxide catalyst. By combining computational and experimental methods, this study not only advances the understanding of the Cu-Mn oxide system for ozone decomposition but also contributes valuable insights into developing more efficient catalysts to mitigate ozone pollution.
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Affiliation(s)
- Yuna Song
- School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, South Korea
| | - Min Jae Shin
- School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, South Korea
| | - Byung Chan Kwon
- Institute of Clean Technology, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, South Korea
| | - Jungseob So
- Environment and Sustainable Resources Research Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea
| | - Young Jin Kim
- Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Daegu 41566, Republic of Korea
| | - Dohyung Kang
- Department of Future Energy Convergence, Seoul National University of Science and Technology, 232 Gongneung-Ro, Nowon-Gu, Seoul 01811, Republic of Korea
| | - No-Kuk Park
- Institute of Clean Technology, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, South Korea
| | - Minkyu Kim
- School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, South Korea
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Chen H, Chen Q, Hu X, Ding C, Huang L, Wang N. Mullite-like SmMn 2O 5-Derived Composite Oxide-Supported Ni-Based Catalysts for Hydrogen Production by Auto-Thermal Reforming of Acetic Acid. MATERIALS (BASEL, SWITZERLAND) 2024; 17:2490. [PMID: 38893754 PMCID: PMC11173235 DOI: 10.3390/ma17112490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2024] [Revised: 05/17/2024] [Accepted: 05/18/2024] [Indexed: 06/21/2024]
Abstract
The x%Ni/Sm2O3-MnO (x = 0, 10, 15, 20) catalysts derived from SmMn2O5 mullite were prepared by solution combustion and impregnation method; auto-thermal reforming (ATR) of acetic acid (HAc) for hydrogen production was used to explore the metal-support effect induced by Ni loadings on the catalytic reforming activity and product distribution. The 15%Ni/Sm2O3-MnO catalyst exhibited optimal catalytic performance, which can be due to the appropriate Ni loading inducing a strong metal-support interaction to form a stable Ni/Sm2O3-MnO active center, while side reactions, such as methanation and ketonization, were well suppressed. According to characterizations, Sm2O3-MnO mixed oxides derived from SmMn2O5 mullite were formed with oxygen vacancies; nevertheless, loading of Ni metal further promoted the formation of oxygen vacancies, thus enhancing adsorption and activation of oxygen-containing intermediate species and resulting in higher reactivity with HAc conversion near 100% and hydrogen yield at 2.62 mol-H2/mol-HAc.
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Affiliation(s)
- Hui Chen
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
| | - Qi Chen
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
| | - Xiaomin Hu
- College of Environmental Science and Engineering, Beijing University of Technology, Beijing 100124, China
| | - Chenyu Ding
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
| | - Lihong Huang
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China
| | - Ning Wang
- College of Environmental Science and Engineering, Beijing University of Technology, Beijing 100124, China
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4
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Qing Q, Zhu S, Jin H, Mei T, Liu W, Zhao S. Efficient ozone decomposition in high humidity environments using novel iron-doped OMS-2-loaded activated carbon material. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:35678-35687. [PMID: 38740682 DOI: 10.1007/s11356-024-33623-0] [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: 02/21/2024] [Accepted: 05/06/2024] [Indexed: 05/16/2024]
Abstract
This study effectively addresses the rapid deactivation of manganese-based catalysts in humid environments during ozone decomposition by introducing iron-doped manganese oxide octahedral molecular sieve (Fe-OMS-2) catalysts supported on activated carbon (AC). By optimizing the doping ratio of Fe-OMS-2, the Fe-OMS-20.5/AC catalyst achieves nearly 100% ozone decomposition efficiency across a wide range of relative humidity levels (0 to 60%), even at elevated air flow rates of 800 L·g-1·h-1, outperforming standalone AC, Fe-OMS-2, or a simple mixture of OMS-2 and AC. The Fe-OMS-20.5/AC catalyst features a porous surface and a mesoporous structure, providing a substantial specific surface area that facilitates the uniform distribution of the Fe-OMS-2 active phase on the AC surface. The incorporation of Fe3+ ions enhances electron transfer between valence state transitions of Mn, thereby improving the catalyst's efficiency in ozone decomposition. Additionally, the AC component protects catalytic sites and enhances the catalyst's humidity resistance. In conclusion, this research presents a novel strategy for developing highly efficient and cost-effective ozone decomposition catalysts that enhance dehumidification, significantly contributing to industrial ozone treatment technologies and advancing environmental protection.
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Affiliation(s)
- Qishun Qing
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou, Jiangsu, 213001, People's Republic of China
| | - Shouwang Zhu
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou, Jiangsu, 213001, People's Republic of China
| | - Hongyang Jin
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou, Jiangsu, 213001, People's Republic of China
| | - Tianhong Mei
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou, Jiangsu, 213001, People's Republic of China
| | - Wei Liu
- Jiangsu Environmental Engineering Technology Co., Ltd., Nanjing, Jiangsu, 213001, People's Republic of China
| | - Songjian Zhao
- School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou, Jiangsu, 213001, People's Republic of China.
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Li Y, Li H, Zhao B, Ma Y, Liang P, Sun T. Synthetic effect of supports in Cu-Mn-doped oxide catalysts for promoting ozone decomposition under humid environment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:102880-102893. [PMID: 37670093 DOI: 10.1007/s11356-023-29642-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Accepted: 08/29/2023] [Indexed: 09/07/2023]
Abstract
The escalating levels of surface ozone concentration pose detrimental effects on public health and the environment. Catalytic decomposition presents an optimal solution for surface ozone removal. Nevertheless, catalyst still encounters challenges such as poisoning and deactivation in the high humidity environment. The influence of support on catalytic ozone decomposition was examined at a gas hourly space velocity of 300 L·g-1·h-1 and 85% relative humidity under ambient temperature using Cu-Mn-doped oxide catalysts synthesized via a straightforward coprecipitation method. Notably, the Cu-Mn/SiO2 catalyst exhibited remarkable performance on ozone decomposition, achieving 98% ozone conversion and stability for 10 h. Further characterization analysis indicated that the catalyst's enhanced water resistance and activity could be attributed to factors such as an increased number of active sites, a large surface area, abundant active oxygen species, and a lower Mn oxidation state. The catalytic environment created by mixed oxides can offer a clearer understanding of their synergistic effects on catalytic ozone decomposition, providing significant insights into the development of water-resistant catalysts with superior performance.
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Affiliation(s)
- Yunhe Li
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Hao Li
- Environmental Science and Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Baogang Zhao
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China.
| | - Yanming Ma
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Peiyuan Liang
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Tianjun Sun
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China
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Zhu Y, Yang L, Ma J, Fang Y, Yang J, Chen X, Zheng J, Zhang S, Chen W, Pan C, Zhang B, Qiu X, Luo Z, Wang J, Guo Y. Rapid Ozone Decomposition over Water-activated Monolithic MoO 3 /Graphdiyne Nanowalls under High Humidity. Angew Chem Int Ed Engl 2023; 62:e202309158. [PMID: 37496398 DOI: 10.1002/anie.202309158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/25/2023] [Accepted: 07/26/2023] [Indexed: 07/28/2023]
Abstract
Catalytic ozone (O3 ) decomposition at high relative humidity (RH) remains a great challenge due to the catalysts poison and deactivation under high humidity. Here, we firstly elaborate the role of water activation and the corresponding mechanism of the promoted O3 decomposition over the three-dimensional monolithic molybdenum oxide/graphdiyne (MoO3 /GDY) catalyst. The O3 decomposition over MoO3 /GDY reaches up to 100 % under high humid condition (75 % RH) at room temperature, which is 4.0 times as high as that of dry conditions, significantly surpasses other carbon-based MoO3 materials(≤7.1 %). The sp-hybridized carbon in GDY donates electrons to MoO3 along the C-O-Mo bond, facilitating water activation to form hydroxyl species. As a result, hydroxyl species dissociated from water act as new active sites, promoting the adsorption of O3 and the generation of new intermediate species (hydroxyl ⋅OH and superoxo ⋅O2 - ), which significantly lowers the energy barriers of O3 decomposition (0.57 eV lower than dry conditions).
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Affiliation(s)
- Yuhua Zhu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
| | - Leyi Yang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
| | - Jiami Ma
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Yarong Fang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
| | - Ji Yang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
| | - Xiaoping Chen
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
| | - Juan Zheng
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
| | - Shuhong Zhang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
| | - Wei Chen
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
| | - Chuanqi Pan
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
| | - Baojian Zhang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
| | - Xiaofeng Qiu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
| | - Zhu Luo
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
- Wuhan Institute of Photochemistry and Technology, 7 North Bingang Road, Wuhan, Hubei, 430082, P. R. China
| | - Jinlong Wang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
- Wuhan Institute of Photochemistry and Technology, 7 North Bingang Road, Wuhan, Hubei, 430082, P. R. China
| | - Yanbing Guo
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, Hubei, 430082, P. R. China
- Wuhan Institute of Photochemistry and Technology, 7 North Bingang Road, Wuhan, Hubei, 430082, P. R. China
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Facile Synthesis of Metal-Impregnated Sugarcane-Derived Catalytic Biochar for Ozone Removal at Ambient Temperature. Catalysts 2023. [DOI: 10.3390/catal13020388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
This study presents the first attempt at employing catalytic biochar to remove ground-level ozone at ambient temperature. With the increase in human activity, ozone has become a critical inorganic pollutant that needs to be addressed, using more sustainable methods. Fe- and Mn-impregnated catalytic biochars were prepared from a sugarcane feedstock via the wet impregnation method and pyrolysis at various temperatures, where the optimum value was determined to be 550 °C. The metal-impregnated biochar samples demonstrated enhanced surface areas and pore volumes compared with the pristine biochar (SCB550), resulting in improved ozone-adsorption capacity. SCB550-Fe exhibited an ozone-adsorption capacity of 52.1 mg/g at 20 ppm, which was approximately four times higher than that of SCB550. SCB550-Fe demonstrated superior ozone-removal performance compared to SCB550-Mn; 122 mg/g capacity as opposed to 116.2 mg/g at 80 ppm, respectively. Isothermal and kinetic modeling are also presented to suggest a plausible mechanism of ozone removal by catalytic biochar. This includes physical adsorption, complexation, electrostatic interaction, and electron transfer during the redox reaction between ozone and metals. Overall, this study should provide preliminary insights into ozone removal using biochar and promote further research regarding material optimization and kinetic studies.
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Hu W, Chen Y, Xia L, Hu Y, Li G. Flexible membrane composite based on sepiolite/chitosan/(silver nanoparticles) for enrichment and surface-enhanced Raman scattering determination of sulfamethoxazole in animal-derived food. Mikrochim Acta 2022; 189:199. [PMID: 35469076 DOI: 10.1007/s00604-022-05265-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Accepted: 03/07/2022] [Indexed: 11/29/2022]
Abstract
A sepiolite/chitosan/silver nanoparticles (Sep/CTs/AgNPs) membrane substrate has been developed for the fast separation, enrichment, and surface-enhanced Raman scattering (SERS) determination of sulfamethoxazole all-in-one. The Sep/CTs/AgNPs membrane substrate possessed the ability of rapid separation and enrichment to simplify the process for pretreatment and improve the efficiency of analysis. The grown AgNPs can provide abundant hot spots and plasmonic areas to amplify the Raman signals of target molecules effectively. The membrane substrate exhibited good stability with relative standard deviations of 5.8% and 7.1% to same batch and different batches membrane substrate, respectively, by detecting sulfamethoxazole. The SERS method based on Sep/CTs/AgNPs membrane substrate was used for the determination of sulfamethoxazole with a linear range of 0.05-2.0 mg/L, and the limit of detection was 0.020 mg/L. The established SERS method was finally applied to the quantification of sulfamethoxazole in animal-derived food samples. Sulfamethoxazole was actually found in crucian sample with 12.4 μg/kg, and the result was confirmed by a high-performance liquid chromatography method with relative error of 5.3%. The whole process of analysis can be finished within 25 min with recoveries of 89.3-102.2%. The SERS method based on Sep/CTs/AgNPs membrane substrate provided an integrated strategy for rapid and accurate SERS analysis in food safety issues.
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Affiliation(s)
- Wenyao Hu
- School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, China
| | - Yanlong Chen
- School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, China
| | - Ling Xia
- School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, China
| | - Yufei Hu
- School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, China.
| | - Gongke Li
- School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, China.
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Abstract
In aircraft and spacecraft, outside air is not directly fed to the passenger because it contains ozone at elevated altitudes. The decomposition of low concentration ozone in the air was carried out at 25 °C by catalytic oxidation on Pd-based catalysts supported on a high surface area hybrid TiO2. The use of these hybrid catalysts has shown a beneficial effect, both on the catalytic activity and on the catalyst stability. Kinetic studies showed that the most promising catalytic phase (Pd/TiO2_100) was the one obtained from the TiO2 support containing the lowest content of citrate ligands and leading to small Pd particles (around 4 nm). The effect of catalyst synthesis on the decomposition of O3 gas (15 ppm) in a dry and humid (HR = 10%) stream in a closed environment such as aircraft or spacecraft was also investigated in this study and further elucidated by detailed characterizations. It was shown that the system could be used as an effective treatment for air coming from outside.
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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: 0.5] [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.
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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.
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11
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Li X, Shao X, Wang Z, Ma J, He H. Regulating the chemical state of silver via surface hydroxyl groups to enhance ozone decomposition performance of Ag/Fe2O3 catalyst. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.04.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Liu B, Ji J, Zhang B, Huang W, Gan Y, Leung DYC, Huang H. Catalytic ozonation of VOCs at low temperature: A comprehensive review. JOURNAL OF HAZARDOUS MATERIALS 2022; 422:126847. [PMID: 34416698 DOI: 10.1016/j.jhazmat.2021.126847] [Citation(s) in RCA: 71] [Impact Index Per Article: 35.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2021] [Revised: 07/31/2021] [Accepted: 08/04/2021] [Indexed: 06/13/2023]
Abstract
VOCs abatement has attracted increasing interest because of the detrimental effects on both atmospheric environment and human beings of VOCs. The assistance of ozone has enabled efficient VOCs removal at low temperature. Thereby, catalytic ozonation is considered as one of the most feasible and effective methods for VOCs elimination. This work systematically reviews the emerging advances of catalytic ozonation of different VOCs (i.e., aromatic hydrocarbons, oxygenated VOCs, chlorinated VOCs, sulfur-containing VOCs, and saturated alkanes) over various functional catalysts. General reaction mechanism of catalytic ozonation including both Langmuir-Hinshelwood and Mars-van-Krevelen mechanisms was proposed depending on the reactive oxygen species involving the reactions. The influence of reaction conditions (water vapor and temperature) is fully discussed. This review also introduces the enhanced VOCs oxidation via catalytic ozonation in the ozone-generating systems including plasma and vacuum ultraviolet. Lastly, the existing challenges of VOCs catalytic ozonation are presented, and the perspective of this technology is envisioned.
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Affiliation(s)
- Biyuan Liu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Jian Ji
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Boge Zhang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Wenjun Huang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Yanling Gan
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Dennis Y C Leung
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
| | - Haibao Huang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China; Guangdong Indoor Air Pollution Control Engineering Research Center, Guangzhou 510006, China.
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13
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Xu Z, Mo S, Li Y, Zhang Y, Wu J, Fu M, Niu X, Hu Y, Ye D. Pt/MnO x for toluene mineralization via ozonation catalysis at low temperature: SMSI optimization of surface oxygen species. CHEMOSPHERE 2022; 286:131754. [PMID: 34399263 DOI: 10.1016/j.chemosphere.2021.131754] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 06/23/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
The problem of deep oxidation of low concentrations of VOCs in industrial tail gas is exceptionally urgent. The preparation of VOCs ozonation catalyst with a high mineralization rate is still a challenge. In this paper, manganese oxide carriers with different morphologies were synthesized by simple methods and used to catalyze ozone mineralization of toluene after loading Pt nanoparticles efficiently. The conversion of toluene over Pt/MnOx-T catalyst was more than 98 % at ambient temperature, and the mineralization rate of toluene was close to 100 % at 70 °C. Through a variety of characterization methods, the strong metal-support interaction (SMSI) between Pt nanoparticles and carriers was successfully constructed. It was found that SMSI successfully optimized the surface oxygen species and oxygen migration ability of the catalyst, and then realized the high degree of mineralization of toluene at low temperature. This paper guides the subsequent development of Pt-Mn catalysts for catalytic organic pollutants ozonation with high activity.
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Affiliation(s)
- Ziyang Xu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Shengpeng Mo
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Yanxia Li
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Yuchen Zhang
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Junliang Wu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Mingli Fu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou, 510006, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangzhou, 510006, China.
| | - Xiaojun Niu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Yun Hu
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Daiqi Ye
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou, 510006, China; National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, Guangzhou, 510006, China
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14
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Ding J, Cheng F, Meng Z, Cao Y, Han F, Chen D, Cao M, Zhang G, Kang J, Xu S, Xu Q. Core-Shell-Like Structured Co 3O 4@SiO 2 Catalyst for Highly Efficient Catalytic Elimination of Ozone. Front Chem 2021; 9:803464. [PMID: 34957055 PMCID: PMC8695612 DOI: 10.3389/fchem.2021.803464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 11/17/2021] [Indexed: 11/29/2022] Open
Abstract
Co3O4 is an environmental catalyst that can effectively decompose ozone, but is strongly affected by water vapor. In this study, Co3O4@SiO2 catalysts with a core-shell-like structure were synthesized following the hydrothermal method. At 60% relative humidity and a space velocity of 720,000 h−1, the prepared Co3O4@SiO2 obtained 95% ozone decomposition for 40 ppm ozone after 6 h, which far outperformed that of the 25wt% Co3O4/SiO2 catalysts. The superiority of Co3O4@SiO2 is ascribed to its core@shell structure, in which Co3O4 is wrapped inside the SiO2 shell structure to avoid air exposure. This research provides important guidance for the high humidity resistance of catalysts for ozone decomposition.
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Affiliation(s)
- Jingya Ding
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, China
| | - Feng Cheng
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng, China
| | - Zhen Meng
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, China
| | - Yan Cao
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, China
| | - Fennv Han
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, China
| | - Dongbin Chen
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, China
| | - Mingxiang Cao
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, China
| | - Guolin Zhang
- School of Mechanical Engineering, Yancheng Institute of Technology, Yancheng, China
| | - Jiahao Kang
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, China
| | - Shuxiang Xu
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, China
| | - Qi Xu
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, China
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15
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Ji J, Yu Y, Cao S, Huang H. Enhanced activity and water tolerance promoted by Ce on MnO/ZSM-5 for ozone decomposition. CHEMOSPHERE 2021; 280:130664. [PMID: 34162073 DOI: 10.1016/j.chemosphere.2021.130664] [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: 02/05/2021] [Revised: 03/24/2021] [Accepted: 04/22/2021] [Indexed: 06/13/2023]
Abstract
Catalytic decomposition is a promising way to eliminate ozone using manganese oxides. However, water-induced deactivation of the catalysts remains a challenge for further application. In this work, a series of Ce-promoted MnO supported on ZSM-5 (Mn-xCe/ZSM-5) were developed for ozone decomposition, which exhibited superior catalytic performance. The catalysts were characterized by multiple techniques. It is indicated that MnO was highly dispersed on ZSM-5 (Mn/ZSM-5), accounting for the high performance of ozone decomposition. Addition of Ce in Mn/ZSM-5 formed abundant redox pairs that promoted electron transfer, and thus exhibited superior ozone decomposition activity. Mn-3Ce/ZSM-5 with medium Ce loading showed the maximum activity by exposing the most active sites. Furthermore, Mn-3Ce/ZSM-5 was highly water-resistant in comparison with Mn/ZSM-5 by modulating the surface acidic property to be beneficial for the water desorption. This work provides an efficient and facile way to fabricate Ce-promoted Mn with low valence for effective and stable decomposition of ozone at room temperature.
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Affiliation(s)
- Jian Ji
- School of Environmental Science and Engineering, China.
| | - Yi Yu
- School of Environmental Science and Engineering, China
| | - Shuo Cao
- School of Environmental Science and Engineering, China
| | - Haibao Huang
- School of Environmental Science and Engineering, China; Guangdong Indoor Air Pollution Control Engineering Research Center, Sun Yat-sen University, 132 East Waihuan Road, Guangzhou, 510006, China.
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16
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Preparation, Performances and Mechanisms of Co@AC Composite for Herbicide Atrazine Removal in Water. WATER 2021. [DOI: 10.3390/w13020240] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In this study, a high-performance adsorbent Co@AC was prepared by loading cobalt ions (Co2+) on activated carbon (AC) via solution impregnation and high-temperature calcination technology, and was used to remove atrazine in water. The preparation factors on the adsorbent properties were studied, and the characteristics were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and Fourier transform infrared spectrometer (FTIR). The results showed that Co@AC possessed the best performance when the factors were 7.0% of Co2+ (w/v), 7.0 h of immersing time, 500 °C of calcination temperature and 4.0 h of calcination time. The adsorption conditions and mechanisms for atrazine removal by Co@AC were also studied scientifically. As the conditions were pH 4.0, reaction time 90 min and temperature 25 °C, Co@AC had the largest adsorption capacity, which was 92.95 mg/g, and the maximum removal rate reached 94.79%. The correlation coefficient of the Freundlich isotherm was better than that of the Langmuir isotherm, and the adsorption process followed the pseudo-second-order kinetic model. Cycle experiments showed that the removal efficiency of atrazine by Co@AC remained above 85% after five repeated experiments, indicating that Co@AC showed a strong stable performance and is a promising material for pesticides removal.
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17
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Fang C, Li D, Wang X, Wang Y, Chen J, Luo M. Exploring an efficient manganese oxide catalyst for ozone decomposition and its deactivation induced by water vapor. NEW J CHEM 2021. [DOI: 10.1039/d1nj01381e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A series of MnOx catalysts supported by carbon spheres were prepared by calcining mixtures of manganese acetate and carbon spheres under a nitrogen atmosphere, and their performance for ozone decomposition under high humidity conditions (RH = 90%) was evaluated.
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Affiliation(s)
- Chentao Fang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Dandan Li
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Xufang Wang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Yuejuan Wang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Jian Chen
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Mengfei Luo
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
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18
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Li D, Cen B, Fang C, Leng X, Wang W, Wang Y, Chen J, Luo M. High performance cobalt nanoparticle catalysts supported by carbon for ozone decomposition: the effects of the cobalt particle size and hydrophobic carbon support. NEW J CHEM 2021. [DOI: 10.1039/d0nj04876c] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Catalytic gaseous ozone decomposition under high humidity is not only an urgent need but also a significant challenge because of the low stability over the available catalysts.
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Affiliation(s)
- Dandan Li
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Bingheng Cen
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Chentao Fang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Xingyue Leng
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Weiyue Wang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Yuejuan Wang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Jian Chen
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
| | - Mengfei Luo
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
- Jinhua 321004
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19
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Preparation of organic-inorganic chitosan@silver/sepiolite composites with high synergistic antibacterial activity and stability. Carbohydr Polym 2020; 249:116858. [DOI: 10.1016/j.carbpol.2020.116858] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 07/17/2020] [Accepted: 07/29/2020] [Indexed: 12/18/2022]
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20
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Li X, Ma J, He H. Recent advances in catalytic decomposition of ozone. J Environ Sci (China) 2020; 94:14-31. [PMID: 32563478 DOI: 10.1016/j.jes.2020.03.058] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 03/31/2020] [Accepted: 03/31/2020] [Indexed: 06/11/2023]
Abstract
Ozone (O3), as a harmful air pollutant, has been of wide concern. Safe, efficient, and economical O3 removal methods urgently need to be developed. Catalytic decomposition is the most promising method for O3 removal, especially at room temperature or even subzero temperatures. Great efforts have been made to develop high-efficiency catalysts for O3 decomposition that can operate at low temperatures, high space velocity and high humidity. First, this review describes the general reaction mechanism of O3 decomposition on noble metal and transition metal oxide catalysts. Then, progress on the O3 decomposition performance of various catalysts in the past 30 years is summarized in detail. The main focus is the O3 decomposition performance of manganese oxides, which are divided into supported manganese oxides and non-supported manganese oxides. Methods to improve the activity, stability, and humidity resistance of manganese oxide catalysts for O3 decomposition are also summarized. The deactivation mechanisms of manganese oxides under dry and humid conditions are discussed. The O3 decomposition performance of monolithic catalysts is also summarized from the perspective of industrial applications. Finally, the future development directions and prospects of O3 catalytic decomposition technology are put forward.
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Affiliation(s)
- Xiaotong Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jinzhu Ma
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China
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21
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The Preparation and Properties of the Brown Film by Micro-arc Oxidized on In-Situ TiB2/7050Al Matrix Composites. COATINGS 2020. [DOI: 10.3390/coatings10070615] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The brown or grayish-white color films were prepared by the micro-arc oxidation (MAO) method on in-situ TiB2/7050Al composites using these alkaline electrolytes with/without KMnO4 as an additive. The microstructure, elemental composition, chemical state and corrosion behavior have been investigated by the microstructure characterizations and electrochemistry measurements on the MAO films comparatively. The results indicated that a brown film was obtained via adding KMnO4 into the alkaline electrolyte. The coloration mechanism of the brown color can be ascribed to the existence of MnO inside the film. Furthermore, the initiation of corrosion to the Al composite was intensively hindered by the brown MAO film. Compared with the Al substrate and grayish-white film, the brown MAO film exhibited the elevated corrosion potential and reduced corrosion current. Therefore, the brown film has presented an optimized corrosion resistance for the composite.
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22
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Fang C, Hu C, Li D, Chen J, Luo M. Unravelling the efficient catalytic performance of ozone decomposition over nitrogen-doped manganese oxide catalysts under high humidity. NEW J CHEM 2020. [DOI: 10.1039/d0nj04393a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Nitrogen-doped Mn species, coated with a carbon layer of several nanometers in thickness, for enhanced water vapor resistance.
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Affiliation(s)
- Chentao Fang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang
- Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
| | - Caihong Hu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang
- Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
| | - Dandan Li
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang
- Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
| | - Jian Chen
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang
- Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
| | - Mengfei Luo
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang
- Key Laboratory for Reactive Chemistry on Solid Surfaces
- Institute of Physical Chemistry
- Zhejiang Normal University
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23
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Yu Y, Liu S, Ji J, Huang H. Amorphous MnO2 surviving calcination: an efficient catalyst for ozone decomposition. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01426h] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Calcination at 300 °C of amorphous MnO2 maintains the structure and results in superior stability owing to the enhanced water-resistant ability.
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Affiliation(s)
- Yi Yu
- School of Environmental Science and Engineering
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Shuilian Liu
- School of Environmental Science and Engineering
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Jian Ji
- School of Environmental Science and Engineering
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Haibao Huang
- School of Environmental Science and Engineering
- Sun Yat-sen University
- Guangzhou 510006
- China
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology
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