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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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In situ IR spectroscopy study of NO removal over CuCe catalyst for CO-SCR reaction at different temperature. Catal Today 2023. [DOI: 10.1016/j.cattod.2023.114082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
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Jiang G, Jin L, Pan Q, Peng N, Meng Y, Huang L, Wang H. Structural modification of aluminum oxides for removing fluoride in water: crystal forms and metal ion doping. ENVIRONMENTAL TECHNOLOGY 2022; 43:3248-3261. [PMID: 33945450 DOI: 10.1080/09593330.2021.1921044] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 04/16/2021] [Indexed: 06/12/2023]
Abstract
In this paper, the effect of different crystal forms of Al2O3 on fluoride removal was studied. All crystal forms of Al2O3 were based on the same boehmite precursor and were obtained using a hydrothermal and calcination method. γ-Al2O3 had higher fluoride removal performance (52.15 mg/g) compared with θ-Al2O3 and α-Al2O3. Density functional theory (DFT) calculations confirmed that fluoride removal was greatest for γ-Al2O3, followed by θ-Al2O3 and α-Al2O3, and γ-Al2O3 possessed the strongest fluoride binding energy (-3.93 eV). The typical adsorption behaviour was consistent with the Langmuir model and pseudo-second-order model, indicating chemical and monolayer adsorption. Different metal ions were used to modify γ-Al2O3, and lanthanum had the best effect. Lanthanum oxide was shown to play an important role in fluoride removal. The best La/Al doping ratio was 20 At%. The adsorption process of the composite was also consistent with chemical and monolayer adsorption. When the La/Al doping rate was 20%, the adsorption capacity reached 94.64 mg/g. Compared with γ-Al2O3 (1.39 × 10-7 m/s), the adsorption rate of 20La-Al2O3 was 3.93 × 10-7 m/s according to the mass transfer model. Furthermore, DFT was used to provide insight into the adsorption mechanism, which was mainly driven by electrostatic attraction and ion exchange.
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Affiliation(s)
- Guomin Jiang
- School of Material Science and Engineering, Central South University, Changsha, People's Republic of China
| | - Linfeng Jin
- School of Material Science and Engineering, Central South University, Changsha, People's Republic of China
- School of Metallurgy and Environment, Central South University, Changsha, People's Republic of China
- Chinese National Engineering Research Center for Control and Treatment of Heavy Metals Pollution, Changsha, People's Republic of China
| | - Qinglin Pan
- School of Material Science and Engineering, Central South University, Changsha, People's Republic of China
| | - Ning Peng
- School of Material Science and Engineering, Central South University, Changsha, People's Republic of China
- School of Metallurgy and Environment, Central South University, Changsha, People's Republic of China
- Chinese National Engineering Research Center for Control and Treatment of Heavy Metals Pollution, Changsha, People's Republic of China
| | - Yun Meng
- School of Metallurgy and Environment, Central South University, Changsha, People's Republic of China
- Chinese National Engineering Research Center for Control and Treatment of Heavy Metals Pollution, Changsha, People's Republic of China
| | - Lei Huang
- School of Metallurgy and Environment, Central South University, Changsha, People's Republic of China
- Chinese National Engineering Research Center for Control and Treatment of Heavy Metals Pollution, Changsha, People's Republic of China
| | - Haiying Wang
- School of Metallurgy and Environment, Central South University, Changsha, People's Republic of China
- Chinese National Engineering Research Center for Control and Treatment of Heavy Metals Pollution, Changsha, People's Republic of China
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Abstract
Selective catalytic reduction of NO with CO (CO-SCR) has been suggested as an attractive and promising technology for removing NO and CO simultaneously from flue gas. Manganese-copper spinels are a promising CO−SCR material because of the high stability and redox properties of the spinel structure. Here, we synthesized CuxMn3-xO4 spinel by a citrate-based modified pechini method combining CuO and MnOx, controlling the molar Cu/Mn concentrations. All the samples were characterized by SEM, EDX, XRD, TEM, H2−TPR, XPS and nitrogen adsorption measurements. The Cu1.5Mn1.5O4 catalyst exhibits 100% NO conversion and 53.3% CO conversion at 200 °C. The CuxMn3-xO4 catalyst with Cu-O-Mn structure has a high content of high valence Mn, and the high mass transfer characteristics of the foam-like structure together promoted the reaction performance. The CO-SCR catalytic performance of Cu was related to the spinel structure with the high ratio of Mn4+/Mn, the synergistic effect between the two kinds of metal oxides and the multistage porous structure.
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Yadav VK, Das T. Vapor-phase oxidation of cyclohexane over supported Fe-Mn catalysts: in situ DRIFTS studies. Phys Chem Chem Phys 2021; 23:13612-13622. [PMID: 34114585 DOI: 10.1039/d1cp01009c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Alumina-supported Fe-Mn oxide catalysts were synthesized by the incipient wetness impregnation method. The catalysts were characterized using various characterization techniques such as surface area, XRD, H2-TPR, and Raman spectral analysis. The adsorption (Cy-H, CO2) and oxidation of cyclohexane (Cy-H) were conducted by considering the in situ DRIFTS studies. The iron-impregnated catalyst possessed a higher surface area than the manganese-impregnated catalyst. The manganese-oxides remained dispersed in the support and the iron oxides remained in the crystalline phase in the catalyst 20Fe50Mn50/Al2O3. The reduction temperature of the catalyst decreased due to the synergistic effects of the iron-manganese oxides. The catalyst 20Fe50Mn50/Al2O3 was the most active for the vapor-phase oxidation of cyclohexane at 220 °C and 1 atm pressure. The cyclohexanolate, phenolate, and unidentate carbonate species were observed during the study. The lattice oxygen of the catalyst activates the C-H bond of cyclohexane for the formation of reactive-cyclohexanol, further decomposed by dehydration and dehydrogenation.
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Affiliation(s)
- Vijendra Kumar Yadav
- Heterogeneous Catalysis Laboratory (Reaction Engineering), Department of Chemical Engineering, Indian Institute of Technology Roorkee, Haridwar, UK 247667, India.
| | - Taraknath Das
- Heterogeneous Catalysis Laboratory (Reaction Engineering), Department of Chemical Engineering, Indian Institute of Technology Roorkee, Haridwar, UK 247667, India.
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Abstract
Removal of nitrogen oxides during coal combustion is a subject of great concerns. The present study reviews the state-of-art catalysts for NO reduction by CO, CH4, and H2. In terms of NO reduction by CO and CH4, it focuses on the preparation methodologies and catalytic properties of noble metal catalysts and non-noble metal catalysts. In the technology of NO removal by H2, the NO removal performance of the noble metal catalyst is mainly discussed from the traditional carrier and the new carrier, such as Al2O3, ZSM-5, OMS-2, MOFs, perovskite oxide, etc. By adopting new preparation methodologies and introducing the secondary metal component, the catalysts supported by a traditional carrier could achieve a much higher activity. New carrier for catalyst design seems a promising aspect for improving the catalyst performance, i.e., catalytic activity and stability, in future. Moreover, mechanisms of catalytic NO reduction by these three agents are discussed in-depth. Through the critical review, it is found that the adsorption of NOx and the decomposition of NO are key steps in NO removal by CO, and the activation of the C-H bond in CH4 and H-H bonds in H2 serves as a rate determining step of the reaction of NO removal by CH4 and H2, respectively.
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Surface configuration modulation for FeO -CeO2/γ-Al2O3 catalysts and its influence in CO oxidation. J Catal 2020. [DOI: 10.1016/j.jcat.2020.04.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Wang X, Wang J, Liu A, Yu Y, Ji J, Guo K, Wan H, Tang C, Dong L. Unravelling the structure sensitivity of CuO/SiO 2 catalysts in the NO + CO reaction. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00191k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
CuO/SiO2 catalysts with vast difference in copper dispersion were prepared by impregnation and ammonia-evaporation methods and used for exploring the structure sensitivity of CuO/SiO2 catalysts in the NO + CO reaction.
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Affiliation(s)
- Xiuwen Wang
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Jin Wang
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Annai Liu
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Yaxin Yu
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Jiawei Ji
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Kai Guo
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Haiqin Wan
- Jiangsu Key Laboratory of Vehicle Emissions Control
- Nanjing 210023
- China
- School of Environment
- Nanjing University
| | - Changjin Tang
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
- Jiangsu Key Laboratory of Vehicle Emissions Control
| | - Lin Dong
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
- Jiangsu Key Laboratory of Vehicle Emissions Control
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