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Chen Y, Zhang G, Ji Q, Liu H, Qu J. Triggering of Low-Valence Molybdenum in Multiphasic MoS 2 for Effective Reactive Oxygen Species Output in Catalytic Fenton-like Reactions. ACS APPLIED MATERIALS & INTERFACES 2019; 11:26781-26788. [PMID: 31274282 DOI: 10.1021/acsami.9b05978] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Utilization of photocatalytic reactions to trigger persistent large-scale reactions could be an alternative path for practical solar energy conversion to relieve environmental pressure nowadays. We took the view that the photoinduction of transition states was critical for improving the activity of catalytic reactions. On the basis of theoretical predictions, the reaction Gibbs free energy of permonosulfate (PMS) activation can be rapidly reduced by molybdenum with low valence. We therefore constructed a multiphasic molybdenum dichalcogenide (MoS2) heterostructure-based photosystem that enabled generation of Mo transition states by visible light excitation. According to combination results of electron paramagnetic resonance, photoelectrochemical analysis, and X-ray photoelectron spectroscopy, we confirmed that the optimized 2H/1T heterojunction permitted the transport of excited interfacial electrons from the semiconductive 2H phase to the metallic 1T phase, and synchronously partially reduced Mo(IV) to Mo(III) at the interface. This intensified the charge transfer between the MoS2 and PMS-containing solution, thereby efficiently splitting the PMS molecules into •OH and SO4•- radicals. In this system, a type of refractory herbicide, 2,4-dichlorophenoxyacetic acid (2,4-D), can be degraded within 60 min at a rate constant of 6.20 × 10-2 min-1 using multiphasic MoS2 with a 1T/2H ratio of 1:1.
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Affiliation(s)
- Yu Chen
- Key Laboratory of Drinking Water Science and Technology Research Centre for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Gong Zhang
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Qinghua Ji
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Huijuan Liu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Jiuhui Qu
- Key Laboratory of Drinking Water Science and Technology Research Centre for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
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52
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Chen Y, Zhang G, Liu H, Qu J. Confining Free Radicals in Close Vicinity to Contaminants Enables Ultrafast Fenton‐like Processes in the Interspacing of MoS
2
Membranes. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201903531] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Yu Chen
- Key Laboratory of Drinking Water Science and Technology Research Centre for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China
- University of Chinese Academy of Sciences Beijing 100049 China
- Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China
| | - Gong Zhang
- Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China
| | - Huijuan Liu
- Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China
| | - Jiuhui Qu
- Key Laboratory of Drinking Water Science and Technology Research Centre for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China
- University of Chinese Academy of Sciences Beijing 100049 China
- Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China
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53
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Chen Y, Zhang G, Liu H, Qu J. Confining Free Radicals in Close Vicinity to Contaminants Enables Ultrafast Fenton-like Processes in the Interspacing of MoS 2 Membranes. Angew Chem Int Ed Engl 2019; 58:8134-8138. [PMID: 31020744 DOI: 10.1002/anie.201903531] [Citation(s) in RCA: 192] [Impact Index Per Article: 38.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Indexed: 11/10/2022]
Abstract
Heterogenous Fenton-like reactions are frequently proposed for treating persistent pollutants through the generation of reactive radicals. Despite great efforts to optimize catalyst activity, their broad application in practical settings has been restricted by the low efficiency of hydrogen peroxide or persulfate decomposition as well as ultrafast self-quenching of the activated radicals. Theoretical calculations predicted that two-dimensional (2D) metallic 1T phase MoS2 materials with exposed (001) surfaces and (100) edges should have remarkable affinity towards crucial intermediates in the peroxymonosulfate (PMS) activation process. X-ray photoelectron spectroscopy and in situ Raman spectroscopy were used to show that the exposed metallic Mo sites accelerate the rate-limiting step of electron transfer. A lamellar membrane made from a stack of 2D MoS2 with tunable interspacing was then designed as the catalyst. The non-linear transport between the MoS2 nanolayers leads to high water diffusivity so that the short-lived reactive radicals efficiently oxidize contaminants.
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Affiliation(s)
- Yu Chen
- Key Laboratory of Drinking Water Science and Technology Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.,University of Chinese Academy of Sciences, Beijing, 100049, China.,Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Gong Zhang
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Huijuan Liu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Jiuhui Qu
- Key Laboratory of Drinking Water Science and Technology Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.,University of Chinese Academy of Sciences, Beijing, 100049, China.,Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
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54
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Li J, Lan H, Liu H, Zhang G, An X, Liu R, Qu J. Intercalation of Nanosized Fe 3C in Iron/Carbon To Construct Multifunctional Interface with Reduction, Catalysis, Corrosion Resistance, and Immobilization Capabilities. ACS APPLIED MATERIALS & INTERFACES 2019; 11:15709-15717. [PMID: 30964255 DOI: 10.1021/acsami.9b03409] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
As a robust reducing system in industrial wastewater treatment, iron/carbon (Fe/C) microelectrolysis suffers from surface passivation and low utilization efficiency. Herein, we introduced Fe3C into the Fe/C system to develop a core-shell Fe0/Fe3C/C nanorod with a multifunctional interface (Fe3C/C) providing reduction, catalysis, adsorption, and corrosion resistance. The results proved that the fabricated Fe0/Fe3C/C possesses 5.6 times higher reduction capacity (220 mg/g) for Cr(VI) reduction but a relatively lower Fe leakage (2.7 mg/L) than Fe/C. On the basis of the results of electrochemical characterization (Tafel polarization curves and electrochemical impedance spectroscopy), the corrosion-resistant Fe3C/C shell can significantly prevent surface passivation of the Fe0 core, whereas Fe3C efficiently catalyzes electron transfer from the inner Fe0 to the external carbon surface. Moreover, the reductive species involved in Cr(VI) removal were identified as hydrogen atoms, adsorbed Fe(II) ions, and electrons tunneling from Fe0. STEM, XPS, and Mössbauer spectroscopies were further adopted to characterize the interface reaction of Fe0/Fe3C/C during the Cr(VI) removal process. Finally, the reaction mechanism for Cr(VI) reduction over Fe0/Fe3C/C was proposed, and the distribution of active sites was inferred.
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Affiliation(s)
- Jianfei Li
- State Key Laboratory of Drinking Water Science and Technology , Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100039 , China
| | - Huachun Lan
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Huijuan Liu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Gong Zhang
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Xiaoqiang An
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Ruiping Liu
- State Key Laboratory of Drinking Water Science and Technology , Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100039 , China
| | - Jiuhui Qu
- State Key Laboratory of Drinking Water Science and Technology , Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085 , China
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
- University of Chinese Academy of Sciences , Beijing 100039 , China
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55
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Li Q, Huang X, Su G, Zheng M, Huang C, Wang M, Ma C, Wei D. The Regular/Persistent Free Radicals and Associated Reaction Mechanism for the Degradation of 1,2,4-Trichlorobenzene over Different MnO 2 Polymorphs. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:13351-13360. [PMID: 30371067 DOI: 10.1021/acs.est.8b03789] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The role of regular/persistent free radicals on the catalytic activity of K+-tuned MnO2 tunnel structures is poorly understood to date. Herein, three MnO2 polymorphs (α-, β-, and δ-MnO2) were synthesized and examined toward the degradation of 1,2,4-trichlorobenzene (1,2,4-TrCBz) at 300 °C. δ-MnO2, with a two-dimensional-layered tunnel structure tuned by K+, exhibited the highest activity among the three MnO2 polymorphs. The electron spin resonance spectroscopy results confirmed that δ-MnO2 featured the most abundant reactive oxygen species (ROS: O2-•, •OH, and 1O2), followed by α-MnO2 (O2-• and 1O2), and β-MnO2 (O2-•), being supported by the calculated energy barrier. It was, intriguingly, noted that persistent organic free radicals, newly recognized as emerging surface-stabilized compound, were remarkably detected in α- and β-MnO2/1,2,4-TrCBz systems but not in more reactive δ-MnO2/1,2,4-TrCBz system. These might contribute to discrepant oxidative degradation process. During the oxidative process, intermediates, including benzoic acid and glycerol, formed via attack by ROS. Upon further attack, these intermediates fragmented into smaller molecules such as formic, acetic, propionic, and butyric acids. The present findings give deeper insights into the role of free radicals on the catalytic degradation of chlorinated aromatics.
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Affiliation(s)
- Qianqian Li
- Key Laboratory of Environmental Nanotechnology and Health Effects , Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Xinchen Huang
- Key Laboratory of Environmental Nanotechnology and Health Effects , Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Guijin Su
- Key Laboratory of Environmental Nanotechnology and Health Effects , Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Minghui Zheng
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Chunhua Huang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Mengjing Wang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
- School of Civil and Environmental Engineering , Nanyang Technological University , 50 Nanyang Avenue , Singapore 639789 , Singapore
| | - Chunyan Ma
- Key Laboratory of Environmental Nanotechnology and Health Effects , Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Da Wei
- Key Laboratory of Environmental Nanotechnology and Health Effects , Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , P.O. Box 2871 , Beijing 100085 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
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56
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Hülsey MJ, Zhang J, Yan N. Harnessing the Wisdom in Colloidal Chemistry to Make Stable Single-Atom Catalysts. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1802304. [PMID: 30051915 DOI: 10.1002/adma.201802304] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 05/14/2018] [Indexed: 05/06/2023]
Abstract
Research on single-atom catalysts (SACs), or atomically dispersed catalysts, has been quickly gaining momentum over the past few years. Although the unique electronic structure of singly dispersed atoms enables uncommon-sometimes exceptional-activities and selectivities for various catalytic applications, developing reliable and general procedures for preparing stable, active SACs in particular for applications under reductive conditions remains a major issue. Herein, the challenges associated with the synthesis of SACs are highlighted semiquantitatively and three stabilization techniques inspired by colloidal science including steric, ligand, and electrostatic stabilization are proposed. Some recent examples are discussed in detail to showcase the power of these strategies in the synthesis of stable SACs without compromising catalytic activity. The substantial further potential of steric, ligand, and electrostatic effects for developing SACs is emphasized. A perspective is given to point out opportunities and remaining obstacles, with special attention given to electrostatic stabilization where little is done so far. The stabilization strategies presented herein have a wide applicability in the synthesis of a series of new SACs with improved performances.
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Affiliation(s)
- Max J Hülsey
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore
| | - Jiaguang Zhang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore
| | - Ning Yan
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore
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57
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Yu L, Zhang G, Liu C, Lan H, Liu H, Qu J. Site-specific surface tailoring for metal ion selectivity via under-coordinated structure engineering. NANOSCALE HORIZONS 2018; 3:632-639. [PMID: 32254116 DOI: 10.1039/c8nh00094h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Coordinatively unsaturated atoms play an important role in structural and electronic tuning, while their effects on surface site tailoring for selective adsorption have not been well explored. We demonstrate a new concept based on elaborate tuning of the chemical states of lattice atoms to control the accessibility of different surface sites. The under-coordinated manganese structure developed herein not only benefits the formation of hydroxylated lateral edge sites for preferential complexation of lead (Pb) ions, but also favors a decrease in the proportions of metal-ion-nonspecific octahedral vacancy sites. On the basis of this strategy, a common core-shell structure was devised to further assemble highly exposed edge sites, achieving high selectivity coefficients (31.2-172.0) for Pb(ii) against various metal cations. Even when these metal cations coexist at higher concentrations, the general specificity is still maintained, with further pH-enabled switchable sorption-desorption for adsorbent recyclability. Different from frequently reported specific ligand-induced selective systems, intrinsic structure modification as described herein will lead to a new paradigm for surface site tailoring that enables a versatile and tunable platform in environmental remediation, resource recovery and analyte sensing.
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Affiliation(s)
- Li Yu
- State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, P. R. China.
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58
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Huang Y, Gao Y, Zhang Q, Zhang Y, Cao JJ, Ho W, Lee SC. Biocompatible FeOOH-Carbon quantum dots nanocomposites for gaseous NO x removal under visible light: Improved charge separation and High selectivity. JOURNAL OF HAZARDOUS MATERIALS 2018; 354:54-62. [PMID: 29727790 DOI: 10.1016/j.jhazmat.2018.04.071] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 04/21/2018] [Accepted: 04/26/2018] [Indexed: 06/08/2023]
Abstract
Development of biocompatible photocatalysts with improved charge separation and high selectivity is essential for effective removal of air pollutants. Iron-containing catalysts have attracted extensive attention due to their low-toxicity and high natural abundance. Here, carbon quantum dots (CQDs) modified FeOOH nanocomposites fabricated using a facile hydrothermal route showed enhanced NO removal efficiency (22%) compared to pure FeOOH. Moreover, generation of toxic NO2 intermediates was significantly inhibited using the nanocomposites, demonstrating high selectivity for final nitrate formation. Photo-electrochemical results showed that both charge separation and transfer efficiency were significantly improved by CQDs addition, and the lifetime of photo-generated carriers was increased eventually. Density functional theory calculations further elucidated that the suppressed recombination of photo-induced electron-hole pairs was due to enhanced electron migration from the FeOOH to CQDs. A NO degradation mechanism was proposed based on detection of the reactive oxygen species using electron paramagnetic spectroscopy. In addition, the nanocomposite showed good biocompatibility and low cytotoxity, ensuring minimal environmental impact for potential application in large-scale.
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Affiliation(s)
- Yu Huang
- Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; State Key Lab of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China.
| | - Yunxia Gao
- Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China
| | - Qian Zhang
- Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; State Key Lab of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China
| | - Yufei Zhang
- Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; State Key Lab of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China
| | - Jun-Ji Cao
- Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China; State Key Lab of Loess and Quaternary Geology (SKLLQG), Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China
| | - Wingkei Ho
- Department of Science and Environmental Studies, The Education University of Hong Kong, Hong Kong, China
| | - Shun Cheng Lee
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
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59
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Xie J, Wei Y, Song X, Chen Y, Zou Q, Wang M, Xu A, Li X. Controlled growth of γ-MnO 2 nanoflakes on OMS-2 for efficient decomposition of organic dyes in aqueous solution via peroxymonosulfate activation. J Colloid Interface Sci 2018; 529:476-485. [PMID: 29945018 DOI: 10.1016/j.jcis.2018.06.037] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 06/13/2018] [Accepted: 06/17/2018] [Indexed: 10/28/2022]
Abstract
The development of green and efficient catalysts for peroxymonosulfate (PMS) activation and abatement of organic pollutants in wastewater is of significant practical interest. In this paper, the three-dimensional mixed manganese oxides of OMS-2 and γ-MnO2 were fabricated through a simple refluxing method from KMnO4 and MnSO4. It was found that growth of γ-MnO2 nanoflakes on OMS-2 can be controlled by the concentration of MnSO4. The catalysts not only have many excellent structural properties such as interconnected network and highly exposed active sites, but also show the high ratio of low valent manganese species. In particular, the catalysts exhibited much higher efficiency for Acid Orange 7 degradation in the presence of PMS than pure OMS-2 or γ-MnO2. The oxidation of Mn(III) species by PMS occurs in the system with the formation of sulfate and hydroxyl radicals contributed to the dye degradation. Moreover, the catalysts showed good stability and reusability during four consecutive cycles. Thus, the environmental friendly mixed manganese oxides of γ-MnO2 and OMS-2 with low cost, facile synthesis process and high efficiency are very promising catalysts for PMS activation and pollutants degradation.
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Affiliation(s)
- Jinyan Xie
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, PR China
| | - Yi Wei
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, PR China
| | - Xiaojie Song
- School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, PR China
| | - Yamin Chen
- School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, PR China
| | - Qiancheng Zou
- School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, PR China
| | - Manye Wang
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, PR China
| | - Aihua Xu
- School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, PR China; Engineering Research Center for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan 430200, PR China
| | - Xiaoxia Li
- School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, PR China.
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