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Xiong S, Zhang K, Xu Z, Ou H, Zheng Y, Li X, Peng Y, Luo X, Li J. Enhancing ozone catalytic decomposition through acid treatment of α-MnO 2 for improved activity and humidity resistance. J Environ Sci (China) 2025; 149:35-45. [PMID: 39181648 DOI: 10.1016/j.jes.2023.10.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 10/13/2023] [Accepted: 10/17/2023] [Indexed: 08/27/2024]
Abstract
Post-etching method using dilute acid solutions is an effective technology to modulate the surface compositions of metal-oxide catalysts. Here the α-MnO2 catalyst treated with 0.1 mol/L nitric acid exhibits higher ozone decomposition activity at high relative humidity than the counterpart treated with acetic acid. Besides the increases in surface area and lattice dislocation, the improved activity can be due to relatively higher Mn valence on the surface and newly-formed Brønsted acid sites adjacent to oxygen vacancies. The remnant nitro species deposited on the catalyst by nitric acid treatment is ideal hydrophobic groups at ambient conditions. The decomposition route is also proposed based on the DRIFTS and DFT calculations: ozone is facile to adsorb on the oxygen vacancy, and the protonic H of Brønsted acid sites bonds to the terminal oxygen of ozone to accelerate its cleavage to O2, reducing the reaction energy barrier of O2 desorption.
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Affiliation(s)
- Shangchao Xiong
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Kai Zhang
- School of Life Sciences, Jinggangshan University, Ji'an 343009, China
| | - Zhenghao Xu
- School of Life Sciences, Jinggangshan University, Ji'an 343009, China
| | - Hongjun Ou
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Yuanyuan Zheng
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Xi Li
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Yue Peng
- School of Life Sciences, Jinggangshan University, Ji'an 343009, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
| | - Xubiao Luo
- School of Life Sciences, Jinggangshan University, Ji'an 343009, China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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2
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Fan G, Guo Y, Chai S, Zhang L, Guan J, Ma G, Han N, Chen Y. Synthesis of δ-MnO 2 via ozonation routine for low temperature formaldehyde removal. J Environ Sci (China) 2025; 147:642-651. [PMID: 39003079 DOI: 10.1016/j.jes.2023.04.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 04/18/2023] [Accepted: 04/20/2023] [Indexed: 07/15/2024]
Abstract
Nowadays, it is still a challenge to prepared high efficiency and low cost formaldehyde (HCHO) removal catalysts in order to tackle the long-living indoor air pollution. Herein, δ-MnO2 is successfully synthesized by a facile ozonation strategy, where Mn2+ is oxidized by ozone (O3) bubble in an alkaline solution. It presents one of the best catalytic properties with a low 100% conversion temperature of 85°C for 50 ppm of HCHO under a GHSV of 48,000 mL/(g·hr). As a comparison, more than 6 times far longer oxidation time is needed if O3 is replaced by O2. Characterizations show that ozonation process generates a different intermediate of tetragonal β-HMnO2, which would favor the quick transformation into the final product δ-MnO2, as compared with the relatively more thermodynamically stable monoclinic γ-HMnO2 in the O2 process. Finally, HCHO is found to be decomposed into CO2 via formate, dioxymethylene and carbonate species as identified by room temperature in-situ diffuse reflectance infrared fourier transform spectroscopy. All these results show great potency of this facile ozonation routine for the highly active δ-MnO2 synthesis in order to remove the HCHO contamination.
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Affiliation(s)
- Guijun Fan
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; College of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science and Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 361021, China
| | - Yacong Guo
- Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
| | - Shaohua Chai
- School of Petrochemical Engineering & Environment, Zhejiang Ocean University, Zhoushan 316022, China
| | - Le Zhang
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; College of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science and Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 361021, China
| | - Jian Guan
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; College of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science and Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 361021, China
| | - Guojun Ma
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; College of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ning Han
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; College of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science and Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 361021, China.
| | - Yunfa Chen
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; College of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science and Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 361021, China.
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3
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Cao Z, Long Y, Yang P, Liu W, Xue C, Wu W, Liu D, Huang W. Catalytic ozonation of bisphenol A by Cu/Mn@γ-Al 2O 3: Performance evaluation and mechanism insight. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 349:119403. [PMID: 37890293 DOI: 10.1016/j.jenvman.2023.119403] [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: 07/24/2023] [Revised: 10/08/2023] [Accepted: 10/11/2023] [Indexed: 10/29/2023]
Abstract
Herein, an alumina-based bimetallic catalyst (Cu1Mn7@γ-Al2O3) was synthesized for bisphenol A (BPA) degradation in the catalytic ozonation process. The catalytic ozonation system could degrade 93.9% of BPA within 30 min under the conditions of pH = 7.0, 10 mg L-1 O3 concentration, and 24 g L-1 catalyst dosage compared to ozone alone (21.0%). The enhanced BPA degradation efficiency was attributed to the abundant catalytic sites and synergistic effects of Cu and Mn. The results revealed that the synergistic interaction between Cu and Mn effectively accelerated the electron transfer process on the catalyst surface, thus promoting the generation of reactive oxygen species (ROS). Further studies indicated that the BPA degradation in Cu1Mn7@γ-Al2O3/O3 system predominantly followed the ·OH and O2·- oxidation pathway. Based on the density functional theory (DFT) calculations and intermediates detected by LC-MS analysis, two pathways for BPA degradation in the Cu1Mn7@γ-Al2O3/O3 system were proposed. The toxicity estimation illustrated that the toxicity of BPA and its byproducts was effectively reduced in the Cu1Mn7@γ-Al2O3/O3 system. This work provides a new protocol for O3 activation and pollutant elimination through a novel bimetallic catalyst during water purification.
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Affiliation(s)
- Zhenhua Cao
- Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Yuhan Long
- Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Peizhen Yang
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Wenhao Liu
- Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Cheng Xue
- Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Weiran Wu
- Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Dongfang Liu
- Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
| | - Wenli Huang
- Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
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4
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Wen T, Wang J, Zhang J, Long C. Regulating oxygen vacancies and hydroxyl groups of α-MnO 2 nanorods for enhancing post-plasma catalytic removal of toluene. ENVIRONMENTAL RESEARCH 2023; 238:117176. [PMID: 37729962 DOI: 10.1016/j.envres.2023.117176] [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: 06/09/2023] [Revised: 09/05/2023] [Accepted: 09/17/2023] [Indexed: 09/22/2023]
Abstract
Although nonthermal plasma (NTP) technology has high removal efficiency for volatile organic compounds (VOCs), it has limited carbon dioxide (CO2) selectivity, which hinders its practical application. In this study, α-MnO2 nanorods with tunable oxygen vacancies and hydroxyl groups were synthesized by two-step hydrothermal process to enhance their activity for deep oxidation of toluene. Hydrochloric acid (HCl) was used to assist in synthesis of α-MnO2 nanorods with tunable oxygen vacancies, furtherly, more hydroxyl groups were introduced to HCl-assisted synthesized α-MnO2 by K+ supplement. The results showed that the as-synthesized nanorods exhibited superior activity, improved by nearly 30% removal efficiency of toluene compared to pristine MnO2 at SIE = 339 J/L, and reaching high COx selectivity of 72% at SIE = 483 J/L, successfully promoting the deep oxidation of toluene. It was affirmed that oxygen vacancies played an important role in toluene conversion, improving the conversion of ozone (O3) and resulting in higher mobility of surface lattice oxygen species. Besides, the enhancement of deep oxidation performance was caused by the increase of hydroxyl groups concentration. In-situ DRIFTS experiments revealed that the adsorbed toluene on catalyst surface was oxidized to benzyl alcohol by surface lattice oxygen, and hydroxyl groups were also found participating in toluene adsorption. Overall, this study provides a new approach to designing catalysts for deep oxidation of VOCs.
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Affiliation(s)
- Tiancheng Wen
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China
| | - Jing Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China
| | - Jian Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China; Shenzhen Research Institute of Nanjing University, Shenzhen, 518057, China
| | - Chao Long
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China.
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5
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Wang A, Zhang L, Guan J, Wang X, Ma G, Fan G, Wang H, Han N, Chen Y. Highly efficient ozone elimination by metal doped ultra-fine Cu 2O nanoparticles. J Environ Sci (China) 2023; 134:108-116. [PMID: 37673525 DOI: 10.1016/j.jes.2022.06.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 06/05/2022] [Accepted: 06/07/2022] [Indexed: 09/08/2023]
Abstract
Nowadays, ozone contamination becomes dominant in air and thus challenges the research and development of cost-effective catalyst. In this study, metal doped Cu2O catalysts are synthesized via reduction of Cu2+ by ascorbic acid in base solutions containing doping metal ions. The results show that compared with pure Cu2O, the Mg2+ and Fe2+ dopants enhance the O3 removal efficiency while Ni2+ depresses the activity. In specific, Mg-Cu2O shows high O3 removal efficiency of 88.4% in harsh environment of 600,000 mL/(g·hr) space velocity and 1500 ppmV O3, which is one of the highest in the literature. Photoluminescence and electron paramagnetic spectroscopy characterization shows higher concentration of crystal defects induced by the Mg2+ dopants, favoring the O3 degradation. The in-situ diffuse reflectance Fourier transform infrared spectroscopy shows the intermediate species in the O3 degradation process change from O22- dominant of pure Cu2O to O2- dominant of Mg-Cu2O, which would contribute to the high activity. All these results show the promising prospect of the Mg-Cu2O for highly efficiency O3 removal.
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Affiliation(s)
- Anqi Wang
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science & Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Le Zhang
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science & Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Jian Guan
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science & Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiaoze Wang
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science & Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Guojun Ma
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science & Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Guijun Fan
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science & Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Hang Wang
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Ning Han
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science & Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
| | - Yunfa Chen
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China; Key Laboratory of Science & Technology on Particle Materials, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
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6
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Xie M, Gao R, Li K, Kuang S, Wang X, Wen X, Lin X, Wan Y, Han C. O 2-Generating Fluorescent Carbon Dot-Decorated MnO 2 Nanosheets for "Off/On" MR/Fluorescence Imaging and Enhanced Photodynamic Therapy. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 38037417 DOI: 10.1021/acsami.3c12155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2023]
Abstract
Imaging-guided photodynamic therapy (PDT) has emerged as a promising protocol for cancer theragnostic. However, facile preparation of such a theranostic system for simultaneously achieving tumor location, real-time monitoring, and high-performance reactive oxygen species generation is highly desirable but remains challenging. Herein, we developed a reasonable tumor-targeting strategy based on carbon dots (CDs)-decorated MnO2 nanosheets (HA-MnO2-CDs) with an active magnetic resonance (MR)/fluorescence imaging and enhanced PDT effect. Under light irradiation, the addition of HA-MnO2-CDs increased the production of 1O2 by 2.5 times compared with CDs, providing favorable conditions for the PDT treatment effect on breast cancer. Moreover, HA-MnO2-CDs exhibited excellent performance in producing O2 in the presence of endogenous H2O2, which alleviated hypoxia in tumors and improved the therapeutic effect of PDT. In the presence of glutathione (GSH), the degraded MnO2 nanosheets released CDs and Mn2+ from HA-MnO2-CDs, restoring their fluorescence imaging function and increasing T1 relaxivity (r1) by 23 times. In vivo fluorescence and MR imaging suggested the excellent tumor-targeting property of HA-MnO2-CDs. By combining the complementary properties of nanoprobes and tumor microenvironments, the in vivo PDT therapeutic effect was significantly improved under the action of HA-MnO2-CDs. Overall, our reasonably designed HA-MnO2-CDs may inspire the future development of the next generation of high-performance tumor-responsive diagnostic and therapeutic agents to further enhance the targeted therapy effect of tumors.
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Affiliation(s)
- Manman Xie
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, China
| | - Ruochen Gao
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, China
| | - Ke Li
- Department of Radiology, Xuzhou Central Hospital, Xuzhou, Jiangsu 221009, China
| | - Siying Kuang
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, China
| | - Xiuzhi Wang
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, China
| | - Xin Wen
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, China
| | - Xiaowen Lin
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, China
| | - Yuxin Wan
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, China
| | - Cuiping Han
- School of Medical Imaging, Xuzhou Medical University, Xuzhou 221004, China
- Department of Radiology, Affiliated Hospital of Xuzhou Medical University, Xuzhou 221004, China
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7
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Wang C, Chen J, Li Q, Su S, Jia H, He H. Unveiling the Position Effect of Ce within Layered MnO 2 to Prolong the Ambient Removal of Indoor HCHO. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:4598-4607. [PMID: 36881634 DOI: 10.1021/acs.est.3c00420] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The position of Ce doping has a significant effect on ambient HCHO storage and catalytic oxidation on layered MnO2. By associating structure and performance, it is unveiled that doping Ce into the in-layered lattice of MnO2 is favorable to the generation of high-valence Mn cations, enhancing the oxidizing ability and capacity, but an opposite influence is displayed by interlayered Ce doping. From the aspect of energy minimization calculated by DFT, in-layered Ce doping is also recommended due to the decreased energies for molecule adsorption and oxygen vacancy formation. As a result, in-layered Ce-doped MnO2 displays exceptional activity in catalyzing the deep oxidation of HCHO and a fourfold higher capacity of ambient HCHO storage than pristine MnO2. The optimal oxide is combined with electromagnetic induction heating to complete the "storage-oxidation" cycle as a promising approach absolutely depending on non-noble oxides and household appliances to realize the long-acting removal of indoor HCHO at room temperature.
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Affiliation(s)
- Chunqi Wang
- Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- CAS 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
- College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Jin Chen
- Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- CAS 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
| | - Qiang Li
- Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- CAS 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
| | - Shuangyong Su
- Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- CAS 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
- College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Hongpeng Jia
- Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- CAS 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
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- CAS 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
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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8
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Lu Y, Deng H, Pan T, Liao X, Zhang C, He H. Effective Toluene Ozonation over δ-MnO 2: Oxygen Vacancy-Induced Reactive Oxygen Species. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:2918-2927. [PMID: 36691294 DOI: 10.1021/acs.est.2c07661] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
To improve the reactivity and lifetime of catalysts in the catalytic ozonation of toluene, a simple strategy was provided to regulate the morphology and microstructure of δ-MnO2 via the hydrothermal reaction temperature. The effects of the reaction temperature and the ozone to toluene concentration ratio on the catalyst performance were investigated. The optimized MnO2-260 catalyst prepared at the limiting hydrothermal temperature (260 °C) showed high catalytic activity (XTol = 95%) and excellent stability (1200 min) at the approximately ambient temperature of 40 °C, which was superior to the results in previous studies. The structure and morphology of δ-MnO2 were characterized by extended X-ray absorption fine structure, X-ray diffraction, scanning electron microscopy, positron annihilation lifetime spectroscopy, electron spin resonance, and other techniques. Experimental results and density functional theory calculations were in agreement that surface oxygen vacancy clusters, especially surface oxygen dimer vacancies, are critical in ozone activation. Oxygen vacancies can facilitate the adsorption and activation of O3 to generate reactive oxygen species (ROS, including 1O2, O2-, and •OH), leading to superior ozonation activity to degrade toluene and intermediates. Meanwhile, free radical detection and scavenger tests indicated that •OH is the primary ROS during toluene ozonation rather than 1O2 or O2-.
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Affiliation(s)
- Yuqin Lu
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hua Deng
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tingting Pan
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xu Liao
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Changbin Zhang
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Hong He
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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9
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Lu Y, Deng H, Pan T, Zhang C, He H. Thermal Annealing Induced Surface Oxygen Vacancy Clusters in α-MnO 2 Nanowires for Catalytic Ozonation of VOCs at Ambient Temperature. ACS APPLIED MATERIALS & INTERFACES 2023; 15:9362-9372. [PMID: 36754841 DOI: 10.1021/acsami.2c21120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Catalytic ozonation has gained considerable interest in volatile organic compound (VOC) elimination due to its mild reaction conditions. However, the low activity and mineralization rate of VOCs over catalysts hinder its practical application. Herein, a series of α-MnO2 nanowire catalysts were prepared via thermal annealing treatment at various temperatures to tailor defect species. Numerous characterization techniques were used and combined to investigate the relationship between activity and microstructure. PALS and XAFS indicated that more unsaturated manganese and oxygen vacancies, especially surface oxygen vacancy clusters, were produced in α-MnO2 under the optimal high calcination temperature. As a result, MnO2-600 was found to exhibit the best-ever performance in toluene conversion (95%) and mineralization rate (89.5%) at 20 °C, making it a promising candidate for practical use. The roles of these defects in manipulating the reactive oxygen species of α-MnO2 were clarified by quantifying the amounts of reactive oxygen species by quenching experiments and density functional theory calculations. 1O2 and ·OH species generated in the vicinity of oxygen vacancy clusters, especially the dimer oxygen vacancy cluster, were identified as key oxygen species in the abatement of toluene. This study provides a facile method to engineer the microstructure of MnO2 by means of the manipulation of oxygen vacancies and an in-depth understanding of their roles in the catalytic ozonation of VOC.
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Affiliation(s)
- Yuqin Lu
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hua Deng
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tingting Pan
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Changbin Zhang
- University of Chinese Academy of Sciences, Beijing 100049, China
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Hong He
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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10
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Comparative study of manganese oxides with different oxidation states for catalytic carbonylation of n-butylamine by CO2. J CO2 UTIL 2023. [DOI: 10.1016/j.jcou.2022.102382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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11
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Li R, Rao Y, Huang Y. Advances in catalytic elimination of atmospheric pollutants by two-dimensional transition metal oxides. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.108000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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12
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Zhai LF, Chen YY, Hu Y, Pan YX, Sun M, Yu J, Wang Y, Kong W. MOF-derived MnO@C with high activity for electric field-assisted catalytic oxidation of aqueous pollutants. JOURNAL OF HAZARDOUS MATERIALS 2022; 439:129670. [PMID: 35908403 DOI: 10.1016/j.jhazmat.2022.129670] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 07/02/2022] [Accepted: 07/21/2022] [Indexed: 06/15/2023]
Abstract
The activation of oxygen (O2) under room condition is important for the utilization of air to perform oxidation. Here, we report a porous carbon-encapsulated MnO (MnO@C) derived from Mn metal-organic framework (MOF)grown in-situ on a graphite felt (GF) support. The MnO@C exhibits superior catalytic activity in an electric field-assisted catalytic oxidation system for the degradation of organic pollutants under room condition. The catalytic oxidation reaction applies a surface reaction pathway in which the surface-bound chemisorbed oxygen species are electro-oxidized and then involved in the oxidation of co-adsorbed organic pollutants. The abundant oxygen vacancies and oxygenated functional groups in MnO@C provide active sites for the chemisorption of O2, and its conductive mesoporous structure allows facile electrons and mass transfer. As a result, the MnO@C/GF catalyst displays quite high turnover frequency (TOF) value as 0.038 mg-TOC mg-MnO-1 min-1, which is 6.66 times higher than that of the MnO/GF catalyst prepared by impregnation method as a comparison. With the aid of + 1.0 V of positive electric field, the catalytic oxidation system exhibits extensive effectiveness in mineralizing a variety of dyes, pharmaceuticals, personal care products, and phenolic compounds under room condition with significantly enhanced biodegradability.
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Affiliation(s)
- Lin-Feng Zhai
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, East China Engineering Science & Technology Co., Ltd., Hefei 230088, China.
| | - Yue-Yue Chen
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
| | - Yi Hu
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
| | - Yi-Xiao Pan
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
| | - Min Sun
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China.
| | - Jun Yu
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, East China Engineering Science & Technology Co., Ltd., Hefei 230088, China
| | - Yan Wang
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, East China Engineering Science & Technology Co., Ltd., Hefei 230088, China
| | - Wei Kong
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, East China Engineering Science & Technology Co., Ltd., Hefei 230088, China
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13
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Sun W, Xie S, Sun Y, Qiu X, Zhou J. Preparation of Mn/Zn@PG Catalyst for Catalytic Oxidation Treatment of Coal Chemical Wastewater. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:10812. [PMID: 36078522 PMCID: PMC9518122 DOI: 10.3390/ijerph191710812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 08/24/2022] [Accepted: 08/27/2022] [Indexed: 06/15/2023]
Abstract
In this study, Mn/Zn@palygorskite (PG) catalysts with developed pores and good salt tolerance were prepared and applied to the treatment of coal chemical wastewater. A doping ratio of metal elements, calcination temperature, and calcination time was used to optimize the preparation conditions and determine the optimal preparation conditions of the Mn/Zn@PG catalysts. The catalysts, obtained under various preparation conditions, were characterized and analyzed by XRD, SEM, EDS, BET, XRF, XPS, and other techniques. Results showed that the Zn and Mn elements in the Mn/Zn@PG catalyst existed as ZnO and MnO2, respectively. The optimal working conditions of the Mn/Zn@PG catalyst for catalytic oxidation treatment of coal chemical wastewater, obtained through the optimization of working conditions, are the following: reaction time 60 min, wastewater pH = 9.28, ozone ventilation rate 0.2 L/min, catalyst filling ratio 20%. The height-to-diameter ratio of the tower was 6:1. The abrasion resistance and catalytic performance of the Mn/Zn@PG catalyst after repeated use were investigated, and the mechanism of the loss of active components of the Mn/Zn@PG catalyst was explored. The coal chemical wastewater, before and after treatment, was analyzed by UV-vis spectroscopy and 3D fluorescence spectroscopy. The hierarchical-principal component comprehensive evaluation system (AHP-PCA) was established to evaluate the catalytic ozonation process of coal chemical wastewater, so that the overall evaluation of the process performance can be achieved.
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14
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Yu Y, Wang H, Li H, Tao P, Sun T. Influence of water molecule on active sites of manganese oxide-based catalysts for ozone decomposition. CHEMOSPHERE 2022; 298:134187. [PMID: 35271905 DOI: 10.1016/j.chemosphere.2022.134187] [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: 01/06/2022] [Revised: 02/19/2022] [Accepted: 03/01/2022] [Indexed: 06/14/2023]
Abstract
Developing an efficient approach to decompose ground-level O3 in humidity is crucial for preventing O3 pollution in practical application scenes. In this study, MnOx, CuO, and Cu/MnOx were synthesized to investigate the influence of H2O on the variation of active sites during O3 decomposition. The structural characterizations of the as-synthetic catalysts were measured by N2 physisorption, XRD, SEM, O2-TPD, H2-TPR, TG, and FT-IR analyses. In dry conditions, the elimination rate of O3 followed the sequence of MnOx > Cu/MnOx > CuO. The introduction of Cu to MnOx enhanced the surface area and pore volume of Cu/MnOx, accordingly diminishing the amounts of surface defects and the participation of sub-surface lattice oxygen for catalytic cycle, indicating that surface defects and oxygen vacancies (VO) determined the catalytic activity for O3 decomposition. In humid conditions, the elimination rate of O3 changed to the sequence of Cu/MnOx > MnOx > CuO, with a variation rate compared to dry conditions of -62.9% for MnOx, 14.2% for CuO, and 27.7% for Cu/MnOx. The decrease of participant sub-surface lattice oxygen and the accumulation of intermediates in humidity diminished the decomposition of O3 on MnOx, while the active species such as superoxide radicals generating from the reaction of H2O and Cu/MnOx facilitated the participation of VO and the desorption of O2 from the occupied active sites, accelerating the catalytic cycle on Cu/MnOx. This work developed a deeper understanding of the influence of H2O on catalytic activity, promoting the performance of MnOx-based catalysts for practical O3 decomposition.
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Affiliation(s)
- Yixuan Yu
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Haonan Wang
- Environmental Science and Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Hao Li
- Environmental Science and Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Ping Tao
- Environmental Science and Engineering College, Dalian Maritime University, Dalian, 116026, China
| | - Tianjun Sun
- Marine Engineering College, Dalian Maritime University, Dalian, 116026, China.
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15
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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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16
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Jothinathan L, Cai QQ, Ong SL, Hu JY. Fe-Mn doped powdered activated carbon pellet as ozone catalyst for cost-effective phenolic wastewater treatment: Mechanism studies and phenol by-products elimination. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127483. [PMID: 34673392 DOI: 10.1016/j.jhazmat.2021.127483] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Revised: 09/09/2021] [Accepted: 09/18/2021] [Indexed: 06/13/2023]
Abstract
A novel bimetallic doped PAC (Fe-Mn/PAC) pellet was prepared with a facile sol-gel method and used as an ozone catalyst for phenolic wastewater (PWW) treatment. Adoption of Fe-Mn/PAC pellet in microbubble ozonation enhanced the 1-h chemical oxygen demand (COD) and phenol removal in PWW to 79% and 95%, respectively. With ozone dosage of 10 mg/L, 1 g/L Fe-Mn/PAC pellet exhibited ozone conversion of 92%. In comparison to microbubble ozonation process, Fe-Mn/PAC induced microbubble-catalytic ozonation process promoted ozone decomposition rate by 1.9 times. In terms of •OH production, Fe-Mn/PAC pellet enhanced •OH exposure by 10 times, with a Rct value of 2.92 × 10 -8. Rct kinetic model also suggested that Fe-Mn/PAC pellet obtained higher kinetic rate constants for initiating and promoting •OH generation. Usage of Fe-Mn/PAC pellet in microbubble ozonation for phenolic wastewater treatment also reduced the total ozone consumption by 70%. In Fe-Mn/PAC induced microbubble-catalytic ozonation process, the ratio between ozone consumption and COD removal (ΔO3/ΔCOD) was 0.91. Fe-Mn/PAC pellet characterization with X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FT-IR) and X-ray powder diffraction (XRD) analysis revealed successful doping of Fe-Mn on PAC substrate and larger numbers of carbon-oxygen/hydroxyl surface groups, which played key roles in ozone decomposition and •OH production.
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Affiliation(s)
- L Jothinathan
- Sembcorp-NUS Corporate Laboratory, National University of Singapore, Sembcorp-NUS Corporate Laboratory c/o FoE, Block E1A, #04-01, 1 Engineering Drive 2, 117576, Singapore.; Department of Civil & Environmental Engineering, Faculty of Engineering, National University of Singapore, Block E1A, #07-01, 1 Engineering Drive 2, 117576, Singapore
| | - Q Q Cai
- Sembcorp-NUS Corporate Laboratory, National University of Singapore, Sembcorp-NUS Corporate Laboratory c/o FoE, Block E1A, #04-01, 1 Engineering Drive 2, 117576, Singapore.; Department of Civil & Environmental Engineering, Faculty of Engineering, National University of Singapore, Block E1A, #07-01, 1 Engineering Drive 2, 117576, Singapore
| | - S L Ong
- Sembcorp-NUS Corporate Laboratory, National University of Singapore, Sembcorp-NUS Corporate Laboratory c/o FoE, Block E1A, #04-01, 1 Engineering Drive 2, 117576, Singapore.; Department of Civil & Environmental Engineering, Faculty of Engineering, National University of Singapore, Block E1A, #07-01, 1 Engineering Drive 2, 117576, Singapore
| | - J Y Hu
- Sembcorp-NUS Corporate Laboratory, National University of Singapore, Sembcorp-NUS Corporate Laboratory c/o FoE, Block E1A, #04-01, 1 Engineering Drive 2, 117576, Singapore.; Department of Civil & Environmental Engineering, Faculty of Engineering, National University of Singapore, Block E1A, #07-01, 1 Engineering Drive 2, 117576, Singapore..
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17
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Khuntia S, Mohan G. A comparative study of the catalytic and non-catalytic ozone based processes for simultaneous of SO2 and NOX removal. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2021.10.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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18
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Liang X, Wang L, Wen T, Liu H, Zhang J, Liu Z, Zhu C, Long C. Mesoporous poorly crystalline α-Fe 2O 3 with abundant oxygen vacancies and acid sites for ozone decomposition. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 804:150161. [PMID: 34517313 DOI: 10.1016/j.scitotenv.2021.150161] [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: 06/19/2021] [Revised: 08/27/2021] [Accepted: 09/02/2021] [Indexed: 06/13/2023]
Abstract
In this work, mesoporous poorly crystalline hematite (α-Fe2O3) was prepared using mesoporous silica (KIT-6) functionalized with 3-[(2-aminoethyl)amino]propyltrimethoxysilane as a hard template (SMPC-α-Fe2O3). The disordered atomic arrangement structure of SMPC-α-Fe2O3 promoted the formation of oxygen vacancies, which was confirmed using X-ray photoelectron spectroscopy (XPS), O2-temperature-programmed desorption (TPD), H2-temperature-programmed reduction (TPR), and in situ diffuse reflectance infrared Fourier transform (DRIFT) analyses. Density functional theory calculations (DFT) also proved that reducing the crystallinity of α-Fe2O3 decreased the formation energy of oxygen vacancies. TPD and in situ DRIFT analyses of NH3 adsorption suggested that the surface acidity of SMPC-α-Fe2O3 was considerably higher than those of mesoporous poorly crystalline α-Fe2O3 (MPC-α-Fe2O3) and highly crystalline α-Fe2O3 (HC-α-Fe2O3). The oxygen vacancies and acid sites formed on α-Fe2O3 surface are beneficial for ozone (O3) decomposition. Compared with MPC-α-Fe2O3 and HC-α-Fe2O3, SMPC-α-Fe2O3 exhibited a higher removal efficiency for 200-ppm O3 at a space velocity of 720 L g-1 h-1 at 25 ± 2 °C under dry conditions. Additionally, in situ DRIFT and XPS results suggested that the accumulation of peroxide (O22-) and the conversion of O22- to lattice oxygen over the oxygen vacancies caused catalyst deactivation. However, O22- could be desorbed completely by continuous N2 purging at approximately 350 °C. This study provides significant insights for developing highly active α-Fe2O3 catalysts for O3 decomposition.
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Affiliation(s)
- Xiaoshan Liang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Lisha Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Tiancheng Wen
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Huijuan Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Jian Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Zhu Liu
- Department of Chemistry, Washington State University, Pullman, WA 99164, USA
| | - Chengzhang Zhu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China
| | - Chao Long
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China; Quanzhou Institute for Environmental Protection Industry, Nanjing University, Beifeng Road, Quanzhou 362000, China.
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19
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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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20
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Song H, Xu L, Chen M, Cui Y, Wu CE, Qiu J, Xu L, Cheng G, Hu X. Recent progresses in the synthesis of MnO 2 nanowire and its application in environmental catalysis. RSC Adv 2021; 11:35494-35513. [PMID: 35493136 PMCID: PMC9043261 DOI: 10.1039/d1ra06497e] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Accepted: 10/27/2021] [Indexed: 12/27/2022] Open
Abstract
Nanostructured MnO2 with various morphologies exhibits excellent performance in environmental catalysis owing to its large specific surface area, low density, and adjustable chemical properties. The one-dimensional MnO2 nanowire has been proved to be the dominant morphology among various nanostructures, such as nanorods, nanofibers, nanoflowers, etc. The syntheses and applications of MnO2-based nanowires also have become a research hotspot in environmental catalytic materials over the last two decades. With the continuous deepening of the research, the control of morphology and crystal facet exposure in the synthesis of MnO2 nanowire materials have gradually matured, and the catalytic performance also has been greatly improved. Differences in the crystalline phase structure, preferably exposed crystal facets, and even the length of the MnO2 nanowires will evidently affect the final catalytic performances. Besides, the modifications by doping or loading will also significantly affect their catalytic performances. This review carefully summarizes the synthesis strategies of MnO2 nanowires developed in recent years as well as the influences of the phase structure, crystal facet, morphology, dopant, and loading amount on the catalytic performance. Besides, the cutting-edge applications of MnO2 nanowires in the field of environmental catalysis, such as CO oxidation, the removal of VOCs, denitrification, etc., have been also summarized. The application of MnO2 nanowire in environmental catalysis is still in the early exploratory stage. The gigantic gap between theoretical investigation and industrial application is still a great challenge. Compared with noble metal based traditional environmental catalytic materials, the lower cost of MnO2 has injected new momentum and promising potential into this research field.
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Affiliation(s)
- Huikang Song
- Collaborative Innovation Centre of the Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing 210044 P. R. China
| | - Leilei Xu
- Collaborative Innovation Centre of the Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing 210044 P. R. China
| | - Mindong Chen
- Collaborative Innovation Centre of the Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing 210044 P. R. China
| | - Yan Cui
- Collaborative Innovation Centre of the Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing 210044 P. R. China
| | - Cai-E Wu
- College of Light Industry and Food Engineering, Nanjing Forestry University Nanjing 210037 P. R. China
| | - Jian Qiu
- Jiangsu ShuangLiang Environmental Technology Co., Ltd Jiangyin 214400 P. R. China
| | - Liang Xu
- Jiangsu ShuangLiang Environmental Technology Co., Ltd Jiangyin 214400 P. R. China
| | - Ge Cheng
- Collaborative Innovation Centre of the Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing 210044 P. R. China
| | - Xun Hu
- School of Material Science and Engineering, University of Jinan Jinan 250022 P. R. China
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21
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Ma J, Cao R, Dang Y, Wang J. A recent progress of room–temperature airborne ozone decomposition catalysts. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2021.03.031] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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22
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Post-Plasma Catalysis for Trichloroethylene Abatement with Ce-Doped Birnessite Downstream DC Corona Discharge Reactor. Catalysts 2021. [DOI: 10.3390/catal11080946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Trichloroethylene (TCE) removal was investigated in a post-plasma catalysis (PPC) configuration in nearly dry air (RH = 0.7%) and moist air (RH = 15%), using, for non-thermal plasma (NTP), a 10-pin-to-plate negative DC corona discharge and, for PPC, Ce0.01Mn as a catalyst, calcined at 400 °C (Ce0.01Mn-400) or treated with nitric acid (Ce0.01Mn-AT). One of the key points was to take advantage of the ozone emitted from NTP as a potential source of active oxygen species for further oxidation, at a very low temperature (100 °C), of untreated TCE and of potential gaseous hazardous by-products from the NTP. The plasma-assisted Ce0.01Mn-AT catalyst presented the best CO2 yield in dry air, with minimization of the formation of gaseous chlorinated by-products. This result was attributed to the high level of oxygen vacancies with a higher amount of Mn3+, improved specific surface area and strong surface acidity. These features also allow the promotion of ozone decomposition efficiency. Both catalysts exhibited good stability towards chlorine. Ce0.01Mn-AT tested in moist air (RH = 15%) showed good stability as a function of time, indicating good water tolerance also.
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23
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Jiang H, Zhang R, Hao J, Xu X, Chen J, Zhang Y, Yang F. Design, preparation, characterization, and application of Mn xCu 1-xO y/γ-Al 2O 3 catalysts in ozonation to achieve simultaneous organic carbon and nitrogen removal in pyridine wastewater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 774:145189. [PMID: 33610982 DOI: 10.1016/j.scitotenv.2021.145189] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 12/20/2020] [Accepted: 01/12/2021] [Indexed: 06/12/2023]
Abstract
In the process of treating high-concentration pyridine wastewater, problems such as low treatment efficiency and total nitrogen (TN) residues are always encountered. Catalytic ozonation can degrade pyridine wastewater well, and it also has the potential to remove TN. However, limited research has been conducted on the development of ozonation catalysts that can simultaneously remove the total organic carbon (TOC) and TN. Density functional theory (DFT) technology can determine the number of active components on the catalyst based on its composition; therefore, it can be used to guide the research and development of such catalysts. Here, we presented a strategy to guide the preparation of two-component Mn and Cu catalysts using DFT technology. By characterising and applying the prepared MnxCu1-xOy/γ-Al2O3 catalysts, it was confirmed that the DFT accurately predicted the changes in the active site content. The selected catalyst also achieved strong TOC and TN removal rates during the catalytic ozonation of high-concentration pyridine wastewater. A Box-Behnken design and response surface methodology was used to optimise the process conditions of catalytic ozonation and verify its stability. Under the optimal reaction conditions, the TOC and TN removal efficiencies from a 500 mg/L pyridine solution were 99.8% and 45.8%, respectively. This work indicated that the use of DFT for the design of catalytic materials was an effective method, which can provide a theoretical basis for material design and reduce the time for material screening.
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Affiliation(s)
- Hongbin Jiang
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2#, Dalian 116024, China
| | - Rao Zhang
- Research Institute of No.240, CNNC, Shenyang 110032, China
| | - Jialiang Hao
- JUSCO (DaLian) Environmental Science and Technology Co. Ltd, China
| | - Xiaochen Xu
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2#, Dalian 116024, China.
| | - Jie Chen
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2#, Dalian 116024, China
| | - Yun Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2#, Dalian 116024, China
| | - Fenglin Yang
- Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2#, Dalian 116024, China
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24
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Visible-Light Photocatalyst to Remove Indoor Ozone under Ambient Condition. Catalysts 2021. [DOI: 10.3390/catal11030383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Ozone is a kind of hazardous gas in indoor areas and needs to be removed in order to protect the human respiratory system. Previous methods include physical adsorption, thermal treatment, electromagnetic radiation removal, catalysis and photocatalysis. However, they all have limited effects. This research introduced a novel milestone to remove indoor ozone by utilizing visible light photocatalysis technique under ambient condition. The modified sol–gel method was applied to prepare photocatalysts, strontium titanate (SrTiO3) and rhodium-doped strontium titanate (SrTiO3:Rh). In addition, the SrTiO3:Rh was further immersed in N3 dye to improve its photocatalytic performance. Batch system and continuous-flow system were used to quantify the removal rate of ozone and to measure the conversions of ozone, respectively. The results showed that SrTiO3:Rh possessed a higher ozone removal rate under a visible light condition compared with a commercial P25 TiO2 catalyst. In addition, SrTiO3:Rh based catalysts can also successfully perform visible light ozone photodecomposition in the continuous ozone flow system. Note that current ozone converters in aircraft utilize thermal-catalysts, which can only be operated at high temperature. This research reveals a promising catalysts and photo process, which can possibly replace the current aircraft ozone converters with visible-light driven converters, and boast higher performance under ambient condition.
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Yang R, Fan Y, Ye R, Tang Y, Cao X, Yin Z, Zeng Z. MnO 2 -Based Materials for Environmental Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2004862. [PMID: 33448089 DOI: 10.1002/adma.202004862] [Citation(s) in RCA: 129] [Impact Index Per Article: 43.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 08/31/2020] [Indexed: 06/12/2023]
Abstract
Manganese dioxide (MnO2 ) is a promising photo-thermo-electric-responsive semiconductor material for environmental applications, owing to its various favorable properties. However, the unsatisfactory environmental purification efficiency of this material has limited its further applications. Fortunately, in the last few years, significant efforts have been undertaken for improving the environmental purification efficiency of this material and understanding its underlying mechanism. Here, the aim is to summarize the recent experimental and computational research progress in the modification of MnO2 single species by morphology control, structure construction, facet engineering, and element doping. Moreover, the design and fabrication of MnO2 -based composites via the construction of homojunctions and MnO2 /semiconductor/conductor binary/ternary heterojunctions is discussed. Their applications in environmental purification systems, either as an adsorbent material for removing heavy metals, dyes, and microwave (MW) pollution, or as a thermal catalyst, photocatalyst, and electrocatalyst for the degradation of pollutants (water and gas, organic and inorganic) are also highlighted. Finally, the research gaps are summarized and a perspective on the challenges and the direction of future research in nanostructured MnO2 -based materials in the field of environmental applications is presented. Therefore, basic guidance for rational design and fabrication of high-efficiency MnO2 -based materials for comprehensive environmental applications is provided.
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Affiliation(s)
- Ruijie Yang
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China
| | - Yingying Fan
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China
| | - Ruquan Ye
- Department of Chemistry, State Key Lab of Marine Pollution, City University of Hong Kong, Hong Kong, 999077, P. R. China
| | - Yuxin Tang
- College of Chemical Engineering, Fuzhou University, Fuzhou, 350116, P. R. China
| | - Xiehong Cao
- College of Materials Science and Engineering, Zhejiang University of Technology, 18 Chaowang Road, Hangzhou, Zhejiang, 310014, P. R. China
| | - Zongyou Yin
- Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
| | - Zhiyuan Zeng
- Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China
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Luo X, Su T, Xie X, Qin Z, Ji H. The Adsorption of Ozone on the Solid Catalyst Surface and the Catalytic Reaction Mechanism for Organic Components. ChemistrySelect 2020. [DOI: 10.1002/slct.202003805] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Xuan Luo
- School of Chemistry and Chemical Engineering Guangxi University 100 Daxue Rd. Nanning Guangxi P. R. China 530004
| | - Tongming Su
- School of Chemistry and Chemical Engineering Guangxi University 100 Daxue Rd. Nanning Guangxi P. R. China 530004
| | - Xinling Xie
- School of Chemistry and Chemical Engineering Guangxi University 100 Daxue Rd. Nanning Guangxi P. R. China 530004
| | - Zuzeng Qin
- School of Chemistry and Chemical Engineering Guangxi University 100 Daxue Rd. Nanning Guangxi P. R. China 530004
| | - Hongbing Ji
- School of Chemistry and Chemical Engineering Guangxi University 100 Daxue Rd. Nanning Guangxi P. R. China 530004
- School of Chemistry Sun Yat-sen University 135 Xingang Xi Rd. Guangzhou P. R. China 510275
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27
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Yusuf A, Sun Y, Snape C, He J, Wang C, Ren Y, Jia H. Low-temperature formaldehyde oxidation over manganese oxide catalysts: Potassium mediated lattice oxygen mobility. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.111204] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Li X, Ma J, He H. Tuning the Chemical State of Silver on Ag-Mn Catalysts to Enhance the Ozone Decomposition Performance. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:11566-11575. [PMID: 32786590 DOI: 10.1021/acs.est.0c02510] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Ag-Mn catalysts with excellent water resistance and ozone decomposition activity were successfully synthesized by simple precipitation and impregnation methods. Under a relative humidity of 65% and space velocity of 840,000 h-1, the 6%Ag/α-Mn2O3-I catalyst showed 99% conversion of 40 ppm O3 after 6 h, which was far superior to the performance of the 6%AgMnOx-C (49%), 6%Ag/MnCO3-I (32%), and α-Mn2O3 (5%) catalysts. Physicochemical characterization indicated that the chemical state of Ag on the Ag-Mn catalysts determined the O3 decomposition activity of the catalysts. The Ag species on the 6%Ag/α-Mn2O3-I catalyst were mainly metallic silver nanoparticles (Agn0), which exhibited much better ozone decomposition performance than the Ag1.8Mn8O16 and oxidized silver clusters (Agnδ+) existing on the 6%Ag/MnCO3-I and 6%AgMnOx-C catalysts. The 6%Ag/α-Mn2O3-I catalyst still had above 85% ozone conversion after 60 h under a relative humidity of 65% and space velocity of 840,000 h-1. The slight deactivation of the catalyst was ascribed to the oxidation of Agn0, and its activity could be completely recovered by treatment at 350 °C under an N2 atmosphere, which indicated that it is a promising catalyst for ozone decomposition. This research provides guidance for the subsequent development of Ag-Mn catalysts for ozone decomposition with high activity.
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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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Yu Y, Ji J, Li K, Huang H, Shrestha RP, Kim Oanh NT, Winijkul E, Deng J. Activated carbon supported MnO nanoparticles for efficient ozone decomposition at room temperature. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.05.063] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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30
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Wang Y, Liu K, Wu J, Hu Z, Huang L, Zhou J, Ishihara T, Guo L. Unveiling the Effects of Alkali Metal Ions Intercalated in Layered MnO2 for Formaldehyde Catalytic Oxidation. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02310] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yu Wang
- School of Environmental Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
- College of Resources and Environment Engineering, Wuhan University of Science and Technology, Wuhan 430081, P. R. China
| | - Kaisi Liu
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Ji Wu
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
- International Institute for Carbon-Neutral Energy Research, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan
| | - Zhimi Hu
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Liang Huang
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Jun Zhou
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Tatsumi Ishihara
- International Institute for Carbon-Neutral Energy Research, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan
- Department of Applied Chemistry, Faculty of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 8190395, Japan
| | - Limin Guo
- School of Environmental Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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31
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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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32
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CuO/MnOx composites obtained from Mn-MIL-100 precursors as efficient catalysts for the catalytic combustion of chlorobenzene. REACTION KINETICS MECHANISMS AND CATALYSIS 2020. [DOI: 10.1007/s11144-020-01816-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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33
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Yang R, Han P, Fan Y, Guo Z, Zhao Q, Wang Y, Che S, Lin S, Zhu R. The performance and reaction pathway of δ-MnO 2/USY for catalytic oxidation of toluene in the presence of ozone at room temperature. CHEMOSPHERE 2020; 247:125864. [PMID: 31931318 DOI: 10.1016/j.chemosphere.2020.125864] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 12/26/2019] [Accepted: 01/05/2020] [Indexed: 06/10/2023]
Abstract
In this work, a series of δ-MnO2/USY with different contents of δ-MnO2 (0.3 wt%, 1.5 wt%, 3.0 wt%, 10.0 wt%, and 15.0 wt%) were prepared. In addition, their performances of the adsorption of toluene, degradation and mineralization of toluene, and removal of ozone (O3) were investigated. The results showed that, among all the samples, 3.0 wt% δ-MnO2/USY displayed the best performance of toluene adsorption, degradation and mineralization. Furthermore, according to the in situ DRIFTS and GC-MS analysis, the intermediate by-products during the toluene degradation progress were ascertained and the possible pathway of catalytic oxidation toluene by δ-MnO2/USY in the presence of O3 was proposed.
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Affiliation(s)
- Ruijie Yang
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China; International Joint Research Center for Persistent Toxic Substances, Harbin Institute of Technology(Shenzhen), Shenzhen, 518055, PR China
| | - Pingping Han
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China; International Joint Research Center for Persistent Toxic Substances, Harbin Institute of Technology(Shenzhen), Shenzhen, 518055, PR China
| | - Yingying Fan
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China; International Joint Research Center for Persistent Toxic Substances, Harbin Institute of Technology(Shenzhen), Shenzhen, 518055, PR China
| | - Zhongjie Guo
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China; International Joint Research Center for Persistent Toxic Substances, Harbin Institute of Technology(Shenzhen), Shenzhen, 518055, PR China
| | - Qitong Zhao
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China; International Joint Research Center for Persistent Toxic Substances, Harbin Institute of Technology(Shenzhen), Shenzhen, 518055, PR China
| | - Yang Wang
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China; International Joint Research Center for Persistent Toxic Substances, Harbin Institute of Technology(Shenzhen), Shenzhen, 518055, PR China
| | - Sainan Che
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China; International Joint Research Center for Persistent Toxic Substances, Harbin Institute of Technology(Shenzhen), Shenzhen, 518055, PR China
| | - Songxue Lin
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China; International Joint Research Center for Persistent Toxic Substances, Harbin Institute of Technology(Shenzhen), Shenzhen, 518055, PR China
| | - Rongshu Zhu
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China; International Joint Research Center for Persistent Toxic Substances, Harbin Institute of Technology(Shenzhen), Shenzhen, 518055, PR China.
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Li X, Ma J, Zhang C, Zhang R, He H. Detrimental role of residual surface acid ions on ozone decomposition over Ce-modified γ-MnO 2 under humid conditions. J Environ Sci (China) 2020; 91:43-53. [PMID: 32172981 DOI: 10.1016/j.jes.2019.12.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Revised: 11/28/2019] [Accepted: 12/02/2019] [Indexed: 06/10/2023]
Abstract
In the study, the catalyst precursors of Ce-modified γ-MnO2 were washed with deionized water until the pH value of the supernatant was 1, 2, 4 and 7, and the obtained catalysts were named accordingly. Under space velocity of 300,000 hr-1, the ozone conversion over the pH = 7 catalyst under dry conditions and relative humidity of 65% over a period of 6 hr was 100% and 96%, respectively. However, the ozone decomposition activity of the pH = 2 and 4 catalysts distinctly decreased under relative humidity of 65% compared to that under dry conditions. Detailed physical and chemical characterization demonstrated that the residual sulfate ions on the pH = 2 and 4 catalysts decreased their hydrophobicity and then restrained humid ozone decomposition activity. The pH = 2 and 4 catalysts had inferior resistance to high space velocity under dry conditions, because the residual sulfate ion on their surface reduced their adsorption capacity for ozone molecules and increased their apparent activation energies, which was proved by temperature programmed desorption of O2 and kinetic experiments. Long-term activity testing, X-ray photoelectron spectroscopy and density functional theory calculations revealed that there were two kinds of oxygen vacancies on the manganese dioxide catalysts, one of which more easily adsorbed oxygen species and then became deactivated. This study revealed the detrimental effect of surface acid ions on the activity of catalysts under humid and dry atmospheres, and provided guidance for the development of highly efficient catalysts for ozone decomposition.
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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.
| | - Changbin Zhang
- 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
| | - Runduo Zhang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, 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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Bo Z, Yang S, Kong J, Zhu J, Wang Y, Yang H, Li X, Yan J, Cen K, Tu X. Solar-Enhanced Plasma-Catalytic Oxidation of Toluene over a Bifunctional Graphene Fin Foam Decorated with Nanofin-like MnO 2. ACS Catal 2020; 10:4420-4432. [PMID: 32296596 PMCID: PMC7147263 DOI: 10.1021/acscatal.9b04844] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 02/27/2020] [Indexed: 12/20/2022]
Abstract
In this work, we propose a hybrid and unique process combining solar irradiation and post-plasma catalysis (PPC) for the effective oxidation of toluene over a highly active and stable MnO2/GFF (bifunctional graphene fin foam) catalyst. The bifunctional GFF, serving as both the catalyst support and light absorber, is decorated with MnO2 nanofins, forming a hierarchical fin-on-fin structure. The results show that the MnO2/GFF catalyst can effectively capture and convert renewable solar energy into heat (absorption of >95%), leading to a temperature rise (55.6 °C) of the catalyst bed under solar irradiation (1 sun, light intensity 1000 W m-2). The catalyst weight (9.8 mg) used in this work was significantly lower (10-100 times lower) than that used in previous studies (usually 100-1000 mg). Introducing solar energy into the typical PPC process via solar thermal conversion significantly enhances the conversion of toluene and CO2 selectivity by 36-63%, reaching ∼93% for toluene conversion and ∼83% for CO2 selectivity at a specific input energy of ∼350 J L-1, thus remarkably reducing the energy consumption of the plasma-catalytic gas cleaning process. The energy efficiency for toluene conversion in the solar-enhanced post-plasma catalytic (SEPPC) process reaches up to 12.7 g kWh-1, ∼57% higher than that using the PPC process without solar irradiation (8.1 g kWh-1), whereas the energy consumption of the SEPPC process is reduced by 35-52%. Moreover, the MnO2/GFF catalyst exhibits an excellent self-cleaning capability induced by solar irradiation, demonstrating a superior long-term catalytic stability of 72 h at 1 sun, significantly better than that reported in previous works. The prominent synergistic effect of solar irradiation and PPC with a synergistic capacity of ∼42% can be mainly attributed to the solar-induced thermal effect on the catalyst bed, boosting ozone decomposition (an almost triple enhancement from ∼0.18 gO3 g-1 h-1 for PPC to ∼0.52 gO3 g-1 h-1 for SEPPC) to generate more oxidative species (e.g., O radicals) and enhancing the catalytic oxidation on the catalyst surfaces, as well as the self-cleaning capacity of the catalyst at elevated temperatures driven by solar irradiation. This work opens a rational route to use abundant, renewable solar power to achieve high-performance and energy-efficient removal of volatile organic compounds.
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Affiliation(s)
- Zheng Bo
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Shiling Yang
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Jing Kong
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Jinhui Zhu
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Yaolin Wang
- Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, U.K
| | - Huachao Yang
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Xiaodong Li
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Jianhua Yan
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Kefa Cen
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Xin Tu
- Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, U.K
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Gong S, Wang A, Zhang J, Guan J, Han N, Chen Y. Gram-scale synthesis of ultra-fine Cu2O for highly efficient ozone decomposition. RSC Adv 2020; 10:5212-5219. [PMID: 35498308 PMCID: PMC9049045 DOI: 10.1039/c9ra09873a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 01/10/2020] [Indexed: 12/22/2022] Open
Abstract
Dozens of grams of ultra-fine Cu2O with efficient ozone decomposition was prepared by a facile liquid phase reduction method at room temperature.
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Affiliation(s)
- Shuyan Gong
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Anqi Wang
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Jilai Zhang
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Jian Guan
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Ning Han
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
| | - Yunfa Chen
- State Key Laboratory of Multiphase Complex Systems
- Institute of Process Engineering
- Chinese Academy of Sciences
- Beijing 100190
- PR China
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37
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Li L, Zhang P, Cao R. Porous manganese oxides synthesized with natural products at room temperature: a superior humidity-tolerant catalyst for ozone decomposition. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00196a] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Porous cerium-doped manganese oxides have been facilely synthesized with dopamine and exhibit prominent activity and humidity tolerance for O3 decomposition.
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Affiliation(s)
- Lianxin Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- School of Environment
- Tsinghua University
- Beijing 100084
- China
| | - Pengyi Zhang
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- School of Environment
- Tsinghua University
- Beijing 100084
- China
| | - Ranran Cao
- State Key Joint Laboratory of Environment Simulation and Pollution Control
- School of Environment
- Tsinghua University
- Beijing 100084
- China
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38
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Jiang H, Xu X, Zhang R, Zhang Y, Chen J, Yang F. Nano ferrites (AFe2O4, A = Zn, Co, Mn, Cu) as efficient catalysts for catalytic ozonation of toluene. RSC Adv 2020; 10:5116-5128. [PMID: 35498325 PMCID: PMC9049537 DOI: 10.1039/c9ra10601d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 01/21/2020] [Indexed: 11/21/2022] Open
Abstract
Nano ferrites (AFe2O4, A = Zn, Co, Mn, Cu) were supported on the surface of γ-Al2O3 by hydrothermal synthesis to prepare a series of novel catalysts (AFe2O4/γ-Al2O3) for catalytic ozonation of high concentration toluene at ambient temperature.
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Affiliation(s)
- Hongbin Jiang
- Key Laboratory of Industrial Ecology and Environmental Engineering
- Ministry of Education
- School of Environmental Science and Technology
- Dalian University of Technology
- Dalian 116024
| | - Xiaochen Xu
- Key Laboratory of Industrial Ecology and Environmental Engineering
- Ministry of Education
- School of Environmental Science and Technology
- Dalian University of Technology
- Dalian 116024
| | - Rao Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering
- Ministry of Education
- School of Environmental Science and Technology
- Dalian University of Technology
- Dalian 116024
| | - Yun Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering
- Ministry of Education
- School of Environmental Science and Technology
- Dalian University of Technology
- Dalian 116024
| | - Jie Chen
- Key Laboratory of Industrial Ecology and Environmental Engineering
- Ministry of Education
- School of Environmental Science and Technology
- Dalian University of Technology
- Dalian 116024
| | - Fenglin Yang
- Key Laboratory of Industrial Ecology and Environmental Engineering
- Ministry of Education
- School of Environmental Science and Technology
- Dalian University of Technology
- Dalian 116024
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39
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Huang J, Zhang H. Mn-based catalysts for sulfate radical-based advanced oxidation processes: A review. ENVIRONMENT INTERNATIONAL 2019; 133:105141. [PMID: 31520961 DOI: 10.1016/j.envint.2019.105141] [Citation(s) in RCA: 102] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 08/08/2019] [Accepted: 08/28/2019] [Indexed: 06/10/2023]
Abstract
Sulfate radical-based advanced oxidation processes (AOPs) have drawn increasing attention during the past two decades, and Mn-based materials have been proven to be effective catalysts for activating peroxymonosulfate (PMS) and peroxydisulfate (PDS) to degrade many contaminants. This article presents a comprehensive review of various Mn-based materials to activate PMS and PDS. The activation mechanisms of different Mn-based catalysts (i.e., Mn oxides MnOx, MnOx hybrids, and MnOx‑carbonaceous material composites) were first summarized and discussed in detail. Besides the commonly reported free radicals (SO4-• and •OH), non-radical mechanisms such as singlet oxygen and direct electron transfer have also been discovered for selected materials. The effects of pH, inorganic ions, natural organic matter (NOM), dissolved oxygen content, temperature, and the crystallinity of the materials on the catalytic reactivity were also discussed. Then, important instrumentations and technologies employed to characterize Mn-based materials and to understand the reaction mechanisms were concisely summarized. Three common overlooks in the experimental designs for examining the PMS/PDS-MnOx systems were also discussed. Finally, future research directions were suggested to further improve the technology and to provide a guidance to develop cost-effective Mn-based materials to activate PMS/PDS.
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Affiliation(s)
- Jianzhi Huang
- Department of Civil Engineering, Case Western Reserve University, Cleveland, OH 44106, United States
| | - Huichun Zhang
- Department of Civil Engineering, Case Western Reserve University, Cleveland, OH 44106, United States.
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40
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Sun M, Fang LM, Liu JQ, Zhang F, Zhai LF. Electro-activation of O 2 on MnO 2/graphite felt for efficient oxidation of water contaminants under room condition. CHEMOSPHERE 2019; 234:269-276. [PMID: 31220660 DOI: 10.1016/j.chemosphere.2019.06.083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 05/25/2019] [Accepted: 06/11/2019] [Indexed: 05/12/2023]
Abstract
The activation of oxygen (O2) under room condition is highly desirable for oxidative removal of organic pollutants in water. Herein, we report a graphite felt (GF)-supported α-MnO2 catalyst which is active for activating O2 with assistance of an anodic electric field. The electro-assisted catalytic wet air oxidation (ECWAO) process on MnO2/GF is able to rapidly degrade a variety of dyes, pharmaceutics and personal care products (PPCPs) under room condition. The congo red, basic fuchsin, neutral red and methylene blue are completely mineralized in 160 min, and the bisphenol A, triclosan and ciprofloxacin are mineralized by 89.9%, 81.5% and 65.4%, respectively, in 300 min. Mechanistic study indicates a surface-catalyzed non-free radical pathway for the oxidation of organic pollutants by O2 in the ECWAO process. The oxygen vacancies on MnO2 are identified as the catalytically active sites, at which oxygen atom is transferred from O2 to organic molecule through chemisorbed oxygen species. The anodic electric field assists such an oxygen transfer pathway by activating the complex of chemisorbed oxygen species and organic molecule through electro-oxidation reaction. The ECWAO process on MnO2/GF electrode exhibits a great potential for practical wastewater treatment under room condition.
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Affiliation(s)
- Min Sun
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Li-Ming Fang
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Jia-Qin Liu
- Institute of Industry & Equipment Technology, Hefei University of Technology, Hefei, 230009, China
| | - Feng Zhang
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Lin-Feng Zhai
- Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, China.
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41
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Hasanpour F, Saien J. Incorporating Pb 2+ Templates into the Crystalline Structure of MnO 2 Catalyst Supported on Monolith : Applications in H 2O 2 Decomposition. ACS OMEGA 2019; 4:16638-16650. [PMID: 31616846 PMCID: PMC6788044 DOI: 10.1021/acsomega.9b02565] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Accepted: 09/10/2019] [Indexed: 05/16/2023]
Abstract
Several MnO2 catalysts, promoted with Pb2+ ions and supported on a wash-coated monolith (WMon), briefly, xPbyMn-WMon (x = 0, 0.5, 1.0, 1.5, 2, and 2.5 and y = 8 wt %), were prepared. The presence of Pb2+ affects the manganese oxidation state, crystalline phase, thermal resistance, metal dispersion, and catalytic performance. According to XPS spectra, XRD patterns and HRTEM images, manganese was dispersed on the monolith surface as Mn3+ and Mn4+ species in both α and β crystalline phases. The ratios of Mn4+/Mn3+ states and α/β phases were highly enhanced, and the desired Pb x Mn8O16 phase (coronadite) was formed. Concentrations of the defect oxygen (Mn-O-H) and oxygen vacancies, which improve the catalyst reducibility and the MnO2 reduction temperature, were also increased. Further, based on the H2 chemisorption analysis, the Pb2+ template would increase the manganese dispersion and the reaction sites. Meanwhile, the average MnO2 crystallite size was decreased from 13.26 to 8.15 nm. The optimum catalyst 1.5Pb8Mn-WMon exhibited an activity 149% more than the manganese-only catalyst in decomposition of H2O2. Evaluation of catalyst stability in the presence of Pb2+ after 10 recycles showed only a 6.8% decrease. The catalytic reaction was evaluated based on different criteria.
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Shao J, Xu C, Wang Z, Zhang J, Wang R, He Y, Cen K. NOx Reduction in a 130 t/h Biomass-Fired Circulating Fluid Bed Boiler Using Coupled Ozonation and Wet Absorption Technology. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b03355] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jiaming Shao
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, P. R. China
| | - Chaoqun Xu
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, P. R. China
| | - Zhihua Wang
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, P. R. China
| | - Jianping Zhang
- China Everbright Greentech Limited, Shenzhen 518040, P. R. China
| | - Rongtao Wang
- China Everbright Greentech Limited, Shenzhen 518040, P. R. China
| | - Yong He
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, P. R. China
| | - Kefa Cen
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, P. R. China
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43
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Fang R, Feng Q, Huang H, Ji J, He M, Zhan Y, Liu B, Leung DY. Effect of K+ ions on efficient room-temperature degradation of formaldehyde over MnO2 catalysts. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.05.019] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tao L, Zhao G, Chen P, Zhang Z, Liu Y, Lu Y. High-Performance Co-MnOx
Composite Oxide Catalyst Structured onto Al-Fiber Felt for High-Throughput O3
Decomposition. ChemCatChem 2019. [DOI: 10.1002/cctc.201801401] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Longgang Tao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; Shanghai 200062 P.R. China
| | - Guofeng Zhao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; Shanghai 200062 P.R. China
| | - Pengjing Chen
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; Shanghai 200062 P.R. China
| | - Zhiqiang Zhang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; Shanghai 200062 P.R. China
| | - Ye Liu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; Shanghai 200062 P.R. China
| | - Yong Lu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes; School of Chemistry and Molecular Engineering; East China Normal University; Shanghai 200062 P.R. China
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45
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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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46
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Yang S, Bo Z, Yang H, Shuai X, Qi H, Li X, Yan J, Cen K. Hierarchical Petal-on-Petal MnO2/Vertical Graphene Foam for Postplasma Catalytic Decomposition of Toluene with High Efficiency and Ultralow Pressure Drop. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b03387] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shiling Yang
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Zheng Bo
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Huachao Yang
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Xiaorui Shuai
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Hualei Qi
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Xiaodong Li
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Jianhua Yan
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
| | - Kefa Cen
- State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, College of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
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47
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Zhu G, Zhu J, Li W, Yao W, Zong R, Zhu Y, Zhang Q. Tuning the K + Concentration in the Tunnels of α-MnO 2 To Increase the Content of Oxygen Vacancy for Ozone Elimination. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:8684-8692. [PMID: 29968461 DOI: 10.1021/acs.est.8b01594] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
α-MnO2 is a promising material for ozone catalytic decomposition and the oxygen vacancy is often regarded as the active site for ozone adsorption and decomposition. Here, α-MnO2 nanowire with tunable K+ concentration was prepared through a hydrothermal process in KOH solution. High concentration K+ in the tunnel can expand crystal cell and break the charge balance, leading to a lower average oxidation state (AOS) of Mn, which means abundant oxygen vacancy. DFT calculation has also proven that the samples with higher K+ concentration exhibit lower formation energy for oxygen vacancy. Due to the enormous active oxygen vacancies existing in the α-MnO2 nanowire, the lifetime of the catalyst (corresponding to 100% ozone removal rate, 25 °C) is increased from 3 to 15 h. The FT-IR results confirmed that the accumulation of intermediate oxygen species on the catalyst surface is the main reason why it is deactivated after long time reaction. In this work, the performance of the catalyst has been improved because the abundant active oxygen vacancies are fabricated by the electrostatic interaction between oxygen atoms inside the tunnels and the introduced K+, which offers us a new perspective to design a high efficiency catalyst and may promote manganese oxide for practical ozone elimination.
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Affiliation(s)
- Guoxiang Zhu
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Jinguo Zhu
- School of Materials Science and Engineering , Beihang University , Beijing 100191 , China
| | - Wenlu Li
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Wenqing Yao
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Ruilong Zong
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Yongfa Zhu
- Department of Chemistry , Tsinghua University , Beijing 100084 , China
| | - Qianfan Zhang
- School of Materials Science and Engineering , Beihang University , Beijing 100191 , China
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48
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The Combination of Amorphous Manganese Oxide and Hollow Fiber with Enhanced Activity and Stable Reusability as Heterogeneous Catalyst for Dye Oxidation. J Inorg Organomet Polym Mater 2018. [DOI: 10.1007/s10904-018-0928-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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49
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Liu S, Ji J, Yu Y, Huang H. Facile synthesis of amorphous mesoporous manganese oxides for efficient catalytic decomposition of ozone. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01111g] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Amorphous mesoporous manganese oxides (MnOx) with different microstructures were synthesized via a facile redox method between manganese acetate and potassium permanganate by modulating the addition sequence of the precursors and directly used for catalytic decomposition of ozone.
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Affiliation(s)
- 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
| | - Yi Yu
- 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
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