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Sun W, Cheng Y, Xiao Z, Zhou J, Shah KJ, Sun Y. Catalytic ozonation of reverse osmosis membrane concentrates by catalytic ozonation: Properties and mechanisms. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2024; 96:e11058. [PMID: 38831682 DOI: 10.1002/wer.11058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Revised: 05/06/2024] [Accepted: 05/13/2024] [Indexed: 06/05/2024]
Abstract
Ni-Mn@KL ozone catalyst was prepared for the efficient treatment of reverse osmosis membrane concentrates. The working conditions and reaction mechanism of the ozone-catalyzed oxidation by Ni-Mn@KL were systematically studied. Then, a comprehensive CRITIC weighting-coupling coordination evaluation model was established. Ni-Mn@KL was characterized by scanning electron microscopy, BET, X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive spectrometry, and X-ray fluorescence spectrometry and found to have large specific surface area and homogeneous surface dispersion of striped particles. Under the optimum working conditions with an initial pH of 7.9 (raw water), a reaction height-to-diameter ratio of 10:1, an ozone-aeration intensity of 0.3 L/min, and a catalyst filling rate of 10%, the maximum COD removal rate was 60.5%. Free-radical quenching experiments showed that OH oxidation played a dominant role in the Ni-Mn@KL-catalyzed ozone-oxidation system, and the reaction system conformed to the second-order reaction kinetics law. Ni-Mn@KL catalysts were further confirmed to have good catalytic performance and mechanical performance after repeated utilization. PRACTITIONER POINTS: Ni-Mn@KL catalyst can achieve effective treatment of RO film concentrated liquid. High COD removal rate of RO membrane concentrated liquid was obtained at low cost. Ni-Mn@KL catalyst promotes ozone decomposition to produce ·OH and O2 -· oxidized organic matter. The Ni-Mn@KL catalyst can maintain good stability after repeated use. A CRITIC weight-coupling coordination model was established to evaluate the catalytic ozonation.
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Affiliation(s)
- Wenquan Sun
- College of Urban Construction, Nanjing Tech University, Nanjing, China
| | - Yueqian Cheng
- College of Urban Construction, Nanjing Tech University, Nanjing, China
| | - Zhiqiang Xiao
- College of Urban Construction, Nanjing Tech University, Nanjing, China
| | - Jun Zhou
- College of Urban Construction, Nanjing Tech University, Nanjing, China
| | - Kinjal J Shah
- College of Urban Construction, Nanjing Tech University, Nanjing, China
| | - Yongjun Sun
- College of Urban Construction, Nanjing Tech University, Nanjing, China
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Wang HJ, Yang HH, Li Z, Shen X, Chen TY, Zhan J, Zhou H, Yi X, Zhang SY, Liu Y. Surficial engineering of active hydroxyls for ambient formaldehyde oxidation via enhanced Lewis acidity over Zr-doped cryptomelane materials. ENVIRONMENTAL RESEARCH 2024; 247:118255. [PMID: 38266890 DOI: 10.1016/j.envres.2024.118255] [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: 09/27/2023] [Revised: 11/21/2023] [Accepted: 12/11/2023] [Indexed: 01/26/2024]
Abstract
Lewis acids of solid catalysts have been featured for a pivotal role in promoting various reactions. Regarding the oxidation protocol to remove formaldehyde, the inherent drawback of the best-studied MnO2 materials in acidic sites has eventually caused deficiency of active hydroxyls to sustain low-temperature activity. Herein, the cryptomelane-type MnO2 was targeted and it was tuned via incorporation of Zr metal, exhibiting great advances in not only the complete HCHO-to-CO2 degradation but also cycling performance. Zr species were existent in doping state in the MnO2 lattice, rendering lower crystallinity and breaking the regular growth of MnO2 crystallites, which thereby tripled surface area and created larger volume of smaller mesopores. Meantime, the local electronic properties of Mn atoms were also changed by Zr doping, i.e., more low-valence Mn species were formed due to the electron transfer from Zr to Mn. The results of infrared studies demonstrate the higher possession of Lewis acid sites on ZrMn, and this high degree of electrophilic agents favored the production of hydroxyl species. Furthermore, the reactivity of surface hydroxyls, as investigated by CO temperature programmed reduction and temperature programmed desorption of adsorbed O2, was obviously improved as well after Zr modification. It is speculated jointly with the characterizations of the post-reaction catalysts that the accelerated production of active hydroxyls helped rapidly convert formaldehyde into key intermediate-formate, which was then degraded into CO2, avoiding the side reaction path with undesired intermediate-hydrocarbonate-over the pristine MnO2, where active sites were blocked and formaldehyde oxidation was inhibited. Additionally, Zr decoration could stabilize Lewis acidity to be more resistant to heat degeneration, and this merit brought about advantageous thermal recyclability for cycled application.
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Affiliation(s)
- Hui-Jun Wang
- School of Ocean Science and Technology, Dalian University of Technology, Panjin, 124221, China.
| | - Huan-Huan Yang
- School of Ocean Science and Technology, Dalian University of Technology, Panjin, 124221, China.
| | - Zhonghong Li
- Yingkou Enhancement and Experiment Station, Chinese Academy of Fishery Sciences, Yingkou, 115004, China.
| | - Xudong Shen
- Yingkou Enhancement and Experiment Station, Chinese Academy of Fishery Sciences, Yingkou, 115004, China.
| | - Tian-Yun Chen
- School of Ocean Science and Technology, Dalian University of Technology, Panjin, 124221, China.
| | - Jingjing Zhan
- School of Ocean Science and Technology, Dalian University of Technology, Panjin, 124221, China.
| | - Hao Zhou
- School of Ocean Science and Technology, Dalian University of Technology, Panjin, 124221, China.
| | - Xianliang Yi
- School of Ocean Science and Technology, Dalian University of Technology, Panjin, 124221, China.
| | - Shi-Yu Zhang
- School of Ocean Science and Technology, Dalian University of Technology, Panjin, 124221, China.
| | - Yang Liu
- School of Ocean Science and Technology, Dalian University of Technology, Panjin, 124221, China.
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Hu Y, Wang P, Yu Y, Li M, Xi H, Fu L, Wu C. Aluminum-based ozone catalysts prepared by mixing method: Characteristics, performance and carbon emissions. CHEMOSPHERE 2024; 349:140842. [PMID: 38048834 DOI: 10.1016/j.chemosphere.2023.140842] [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: 06/19/2023] [Revised: 10/15/2023] [Accepted: 11/27/2023] [Indexed: 12/06/2023]
Abstract
Green and low carbon is an essential direction for the development of water treatment technology. Ozone catalysts prepared by the mixing method have advantages in terms of energy consumption and CO2 emissions, but are considered to be insufficient in catalytic efficiency and stability. In this paper, an Mn-Cu-Ce/Al2O3 (MCCA) catalyst was prepared by optimizing the preparation conditions of the mixing method and the types and ratios of active components. Taking petrochemical secondary effluent (PCSE) as the treatment object, the performance of the catalyst and the carbon emission in the preparation process were studied; and compared with the impregnation method. Results showed that compared with catalysts loaded with other components, the MCCA had a higher removal efficiency for TOC (43.04%) and COD (53.18%), which was basically equivalent to the impregnation method, and the treated effluent reached the expected concentration. MCCA promoted the decomposition rate of O3 by ten times, and the main active species generated were found to be •OH and 1O. Similar to the catalytic ozonation by the catalyst prepared by the impregnation method, the adsorption sites and surface hydroxyl groups on the MCCA surface play a significant role in the degradation of pollutants. However, the carbon emission in the catalyst preparation process of the mixing method was 418.68 kg/ton, which was only 44% of the impregnation method (949.67 kg/ton). Under the global low-carbon transition, this study shows that the mixing method aligns more with the concept of green, clean, and efficient ozone catalyst preparation.
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Affiliation(s)
- Yingming Hu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; Research Center of Environmental Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; Environmental Technology Engineering Co Ltd., Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Panxin Wang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; Research Center of Environmental Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Yin Yu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; Research Center of Environmental Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Min Li
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; Research Center of Environmental Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Hongbo Xi
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; Research Center of Environmental Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Liya Fu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; Research Center of Environmental Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Changyong Wu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China; Research Center of Environmental Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
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Li M, Fu L, Deng L, Hu Y, Yuan Y, Wu C. A tailored and rapid approach for ozonation catalyst design. ENVIRONMENTAL SCIENCE AND ECOTECHNOLOGY 2023; 15:100244. [PMID: 36820151 PMCID: PMC9938169 DOI: 10.1016/j.ese.2023.100244] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 02/02/2023] [Accepted: 02/03/2023] [Indexed: 06/18/2023]
Abstract
Catalytic ozonation is widely employed in advanced wastewater treatment owing to its high mineralization of refractory organics. The key to high mineralization is the compatibility between catalyst formulation and wastewater quality. Machine learning can greatly improve experimental efficiency, while fluorescence data can provide additional wastewater quality information on the composition and concentration of organics, which is conducive to optimizing catalyst formulation. In this study, machine learning combined with fluorescence spectroscopy was applied to develop ozonation catalysts (Mn/γ-Al2O3 catalyst was used as an example). Based on the data collected from 52 different catalysts, a machine-learning model was established to predict catalyst performance. The correlation coefficient between the experimental and model-predicted values was 0.9659, demonstrating the robustness and good generalization ability of the model. The range of the catalyst formulations was preliminarily screened by fluorescence spectroscopy. When the wastewater was dominated by tryptophan-like and soluble microbial products, the impregnation concentration and time of Mn(NO3)2 were less than 0.3 mol L-1 and 10 h, respectively. Furthermore, the optimized Mn/γ-Al2O3 formulation obtained by the model was impregnation with 0.155 mol L-1 Mn(NO3)2 solution for 8.5 h and calcination at 600 °C for 3.5 h. The model-predicted and experimental values for total organic carbon removal were 54.48% and 53.96%, respectively. Finally, the improved catalytic performance was attributed to the synergistic effect of oxidation (•OH and 1O2) and the Mn/γ-Al2O3 catalyst. This study provides a rapid approach to catalyst design based on the characteristics of wastewater quality using machine learning combined with fluorescence spectroscopy.
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Affiliation(s)
- Min Li
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
- Research Center of Water Pollution Control Technology, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
| | - Liya Fu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
- Research Center of Water Pollution Control Technology, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
| | - Liyan Deng
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
- Research Center of Water Pollution Control Technology, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
| | - Yingming Hu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
- Research Center of Water Pollution Control Technology, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
- College of Urban and Environment Science, Northwest University, Xi'an, 710127, China
| | - Yue Yuan
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
- Research Center of Water Pollution Control Technology, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
| | - Changyong Wu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
- Research Center of Water Pollution Control Technology, Chinese Research Academy of Environment Sciences, Beijing, 100012, China
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Dong J, Song X, Zhang S, Tan M, Zhao H, Wu D. Performance of alkali and Cu-modified ZSM-5 during catalytic ozonation of polyvinyl alcohol in aqueous solution. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023:10.1007/s11356-023-27874-6. [PMID: 37278895 DOI: 10.1007/s11356-023-27874-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 05/19/2023] [Indexed: 06/07/2023]
Abstract
A novel hierarchical Cu/ZSM-5 was prepared over alkaline treatment and incipient wet impregnation method for the catalytic ozonation of polyvinyl alcohol (PVA). Under the optimum preparation conditions, hierarchical Cu/ZSM-5 exhibited an excellent mineralization performance during the PVA degradation process, and the removal rate of TOC after 60 min of reaction was 47.86%, much higher than that of ozonation alone (5.40%). Its high catalytic activity could attribute to the large pore volume (0.27 cm3/g) and pore size (6.51 nm) which are beneficial for the distribution of loaded copper and adsorption performance for PVA. Compared to ·OH, 1O2 (2.66 times in 10 min) contributed more to the removal of PVA. The degradation of PVA was a combined process of direct ozone oxidation, catalytic ozonation and adsorption. With its high catalytic performance and stability, hierarchical Cu/ZSM-5 has a very broad application prospect in the process of catalytic ozonation of refractory pollutants.
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Affiliation(s)
- Jiayu Dong
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xianni Song
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Shuchi Zhang
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Mengyu Tan
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Haiyan Zhao
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Donglei Wu
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.
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Yuan Y, Garg S, Ma J, Waite TD. Kinetic Modeling-Assisted Mechanistic Understanding of the Catalytic Ozonation Process Using Cu-Al Layered Double Hydroxides and Copper Oxide Catalysts. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:13274-13285. [PMID: 34525801 DOI: 10.1021/acs.est.1c03718] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In this study, copper aluminum layered hydroxides (Cu-Al LDHs) and copper oxide (CuO) were utilized as catalysts for heterogeneous catalytic ozonation (HCO). Target compounds oxalate and formate were used with removal by adsorption and oxidation quantified to elucidate the role of the catalyst in contaminant removal. Oxidation of oxalate mostly occurred on the catalyst surface via interaction of surface oxalate complexes with surface-located oxidants. In contrast, the oxidation of formate occurred in the bulk solution as well as on the surface of the catalyst. Measurement of O3 decay kinetics coupled with fluorescence microscopy image analysis corresponding to 7-hydroxycoumarin formation indicates that while surface hydroxyl groups in Cu-Al LDHs facilitate slow decay of O3 resulting in the formation of hydroxyl radicals on the surface, CuO rapidly transforms O3 into surface-located hydroxyl radicals and/or other oxidants. Futile consumption of surface-located oxidants via interaction with the catalyst surface was minimal for Cu-Al-LDHs; however, it becomes significant in the presence of higher CuO dosages. A mechanistic kinetic model has been developed which adequately describes the experimental results obtained and can be used to optimize the process conditions for the application of HCO.
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Affiliation(s)
- Yuting Yuan
- UNSW Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Shikha Garg
- UNSW Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Jinxing Ma
- UNSW Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - T David Waite
- UNSW Water Research Centre, School of Civil and Environmental Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
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Xu S, Yang J, Hussein R, Liu G, Su B. Heterogeneous ozonation of ofloxacin using MnO x -CeO x /γ-Al 2 O 3 as a catalyst: Performances, degradation kinetics and possible degradation pathways. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2021; 93:1361-1369. [PMID: 33524187 DOI: 10.1002/wer.1524] [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: 08/07/2020] [Revised: 01/05/2021] [Accepted: 01/19/2021] [Indexed: 06/12/2023]
Abstract
In this study, the performance of ofloxacin (OFX) degradation in synthetic wastewater using synthesized MnOx -CeOx /γ-Al2 O3 as a heterogeneous ozonation catalyst was evaluated. The removal rates of OFX and chemical oxygen demand (COD) during 15-day continuous-flow experiments were 98.2% and 76.7% on average, respectively. An ozone index (mgCOD/mgO3 ) of 1.09 with a high ozone utilization efficiency of 91.39% was achieved. The pseudo-first-order rate constant of ofloxacin degradation reached 15.216 × 10-2 min-1 , which was five times that (3.085 × 10-2 min-1 ) without catalysts. The results of gas chromatography-mass spectrometry (GC-MS) demonstrated that a variety of small-molecule organics occurred in the final oxidation products, such as 4-hydroxyl-4-methyl-2-pentanone and 2-oxoadipic acid in addition to homologs of OFX. The results of this study suggested that hydroxyl radicals played critical roles in the degradation and mineralization of OFX via four main pathways: (a) electrophilic addition of nitrogen; (b) breakdown of carbon-carbon double bonds; (c) hydrolysis of ether rings; and (d) halodecarboxylation of carboxyl groups. The biodegradability (BOD5 /COD) of OFX after catalytic ozonation reached 0.54. PRACTITIONER POINTS: Ofloxacin wastewater was treated using catalytic ozonation in a 15-day continuous experiment with MnOx -CeOx /γ-Al2 O3 as a catalyst. The ozone index reached 1.09 mgCOD/mgO3 during ozonation of ofloxacin. The presence of the catalyst increased the reaction rate constant by a factor of five. 4-hydroxy-4-methyl-2-pentanone was the primary ofloxacin oxidation product.
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Affiliation(s)
- Shengkai Xu
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, China
| | - Jiaxin Yang
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, China
| | - Rafaat Hussein
- College of Environment Science and Forest, State University of New York, Syracuse, NY, USA
| | - Guangqing Liu
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, China
| | - Bensheng Su
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, China
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Zhao Y, He D, Chen D, Lu J, Yu J, Liu J, Cao X, Han C, Luo Y. Investigating the Support Effect for Catalytic Elimination of Methyl Mercaptan: Role of Hydroxyl Groups over Cr-based Catalysts. Catal Letters 2020. [DOI: 10.1007/s10562-020-03178-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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