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Zhou Y, Wang J. Electro-Fenton degradation of pefloxacin using MOFs derived Cu, N co-doped carbon as a nanocomposite catalyst. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 355:124198. [PMID: 38782161 DOI: 10.1016/j.envpol.2024.124198] [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: 03/26/2024] [Revised: 05/11/2024] [Accepted: 05/21/2024] [Indexed: 05/25/2024]
Abstract
Electro-Fenton (EF) can in-situ produce H2O2 and effectively activate H2O2 to generate powerful reactive species for the destruction of contaminants under acidic conditions, however, the production of iron-containing sludge and requirement of low working pH significantly hinder its practical application. Herein, a novel Cu, N co-doped carbon (Cu-N@C) with metal organic framework (MOF) as a precursor was constructed and adopted for the elimination of pefloxacin (PEF) in the heterogeneous electro-Fenton (HEF) process. PEF could be almost completely removed within 1 h and total organic carbon (TOC) removal efficiency was 48.57% within 6 h. Meanwhile, Cu-N@C had good repeatability and environmental adaptability, it can still maintain excellent catalytic performance after 10 cycles, and it exhibited satisfactory remediation performance in simulated water matrix. In addition, the HEF process catalyzed by Cu-N@C also showed satisfactory degradation effect on other organic pollutants including atrazine, methylene blue, and chlorotetracycline. Under the action of impressed current, the HEF system could generate H2O2 in-situ, and the active species could be generated in the redox cycle of Cu0/Cu1+/Cu2+. Electron paramagnetic resonance and quenching experiments confirmed that •OH was the dominant active species in the degradation of organic compounds. The degradation process of PEF was studied by mass spectrometry analysis of intermediate products. This study provided a simple method to prepare MOF-based electrocatalyst, which exhibits promising application potential for treatment wastewater.
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Affiliation(s)
- Yaoyu Zhou
- College of Environment and Ecology, Hunan Agricultural University, Changsha, 410128, PR China; Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, PR China
| | - Jianlong Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, PR China; Beijing Key Laboratory of Radioactive Waste Treatment, INET, Tsinghua University, Beijing, 100084, PR China.
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2
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He Y, Zhong D, Xu Y, Jiang R, Zhang J, Liao P. Preparation of Ti/SnO 2-Sb 2O 4-La Electrode with TiO 2 Nanotubes Intermediate Layer and the Electrochemical Oxidation Performance of Rhodamine B. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:7569-7580. [PMID: 38544311 DOI: 10.1021/acs.langmuir.4c00177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/10/2024]
Abstract
A La-doped Ti/SnO2-Sb2O4 electrode with TiO2-NTs intermediate layer (Ti/TiO2-NTs/SnO2-Sb2O4-La) was created via the electrodeposition technique. The physicochemical and electrochemical properties of the electrode were analyzed through FESEM, XRD, XPS, CV, and LSV electrochemical tests. The results showed that TiO2-NTs were tightly packed on the surface of Ti substrate, thus improving the binding force of the SnO2-Sb2O4-La coating, offering greater specific surface area, more active spots, higher current response, and longer lifespan for the degradation of rhodamine B. The lifespan of the Ti/TiO2-NTs/SnO2-Sb2O4-La electrode reached 200 min (1000 mA cm-2, 1 M H2SO4), while the actual service life was up to 3699 h. Under the conditions of initial pH 3.0, Na2SO4 concentration of 0.1 M, current density of 30 mA cm-2, and initial rhodamine B concentration of 20 mg L-1, the color and TOC removal rate of rhodamine B reached 100% and 86.13% within 15 and 30 min, respectively. Rhodamine B was decomposed into acids, esters, and other molecular compounds under the action of •OH and SO4•- free radicals and electrocatalysis, and finally completely mineralized into CO2 and H2O. It is anticipated that this work will yield a novel research concept for producing DSA electrodes with superior catalytic efficacy and elevated stability.
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Affiliation(s)
- Yuanzhen He
- School of Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
| | - Dengjie Zhong
- School of Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
| | - Yunlan Xu
- School of Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
| | - Ran Jiang
- School of Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
| | - Jiayou Zhang
- School of Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
| | - Pengfei Liao
- School of Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
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Wu L, Garg S, Waite TD. Electrochemical treatment of wastewaters containing metal-organic complexes: A one-step approach for efficient metal complex decomposition and selective metal recovery. JOURNAL OF HAZARDOUS MATERIALS 2024; 466:133526. [PMID: 38278072 DOI: 10.1016/j.jhazmat.2024.133526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 12/13/2023] [Accepted: 01/11/2024] [Indexed: 01/28/2024]
Abstract
Metal-organic complexes, especially those of ethylenediaminetetraacetic acid (EDTA) with metals such as copper (Cu) and nickel (Ni) (denoted here as Cu-EDTA and Ni-EDTA), are common contaminants in wastewaters from chemical and plating industries. In this study, a multi-electrode (ME) system using a two-chamber reactor and two pairs of electrodes is proposed for simultaneous electrochemical oxidation of a wastewater containing both Cu-EDTA and Ni-EDTA complexes as well as separation and selective recovery of Cu and Ni onto two different cathodes via electrodeposition. Our results demonstrate that the ME system successfully achieved 90% EDTA removal, 99% solid Cu recovery at the Cu recovery cathode and 56% Ni recovery (33.3% on the Ni recovery cathode and 22.6% in the solution) after a four-hour operation. The system further achieved 85.5% Ni recovery after consecutive five cycles of operation for 20 h. While Cu removal was mainly driven by the direct reduction of EDTA-complexed Cu(II) at the cathode, oxidation of EDTA within the Ni-EDTA complex at the anode was a prerequisite for Ni removal. The oxidation of metal-bound EDTA and free EDTA was driven by •OH and direct electron transfer on the PbO2 anode surface and graphite anode, respectively. We further show that ME system performs well for all pH conditions, treatment of real wastewaters as well as wastewaters containing other metals ions (Cr and Zn) along with Cu/Ni. The separation efficiency of Cu and Ni is dependent on applied electrode potential as well as nature and concentration of binding ligand present with comparatively lower separation efficiency achieved in the presence of weaker binding capacity and/or at lower ligand concentration and lower applied electrode potential. As such, some optimization of electrode potential is required depending on the nature/concentration of ligands in the wastewaters. Overall, this study provides new insights into the design and operation of EAOP technology for effective organic abatement and metal recovery from wastewaters containing mixtures of various metal-organic complexes.
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Affiliation(s)
- Lei Wu
- UNSW Centre for Transformational Environmental Technologies, Yixing, Jiangsu 214206, PR China; UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - Shikha Garg
- UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia
| | - T David Waite
- UNSW Centre for Transformational Environmental Technologies, Yixing, Jiangsu 214206, PR China; UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
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4
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Li Y, Ma H, Li Q, Yan G, Guo S. One-step synthesis of Pt-Nd co-doped Ti/SnO 2-Sb nanosphere electrodes used to degrade nitrobenzene. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:4528-4538. [PMID: 38102431 DOI: 10.1007/s11356-023-31406-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Accepted: 12/03/2023] [Indexed: 12/17/2023]
Abstract
Ti/SnO2-Sb electrodes possess high catalytic activity and efficiently degrade nitrobenzene (NB); however, their low service life limits their wide application. In this study, we used one-step hydrothermal synthesis to successfully prepare Pt-Nd co-doped Ti/SnO2-Sb nanosphere electrodes. Scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were applied to characterize the surface morphology, microstructure, and chemical composition of the electrodes, respectively. The electrochemical activity and stability of the electrodes were characterized via linear sweep and cyclic voltammetry, electrochemical impedance spectroscopy, and an accelerated service life test; their performance for NB degradation was also studied. An appropriate amount of Pt-Nd co-doping refined the average grain size of SnO2 and formed a uniform and compact coating on the electrode surface. The oxygen evolution potential, total voltammetric charge, and electron transfer resistance of the Ti/SnO2-Sb-Nd-Pt electrodes were 1.88 V, 3.77 mC/cm2, and 11.50 Ω, respectively. Hydroxy radical was the main active radical species during the electrolytic degradation of nitrobenzene with Ti/SnO2-Sb-Nd-Pt. After Pt-Nd co-doping, the accelerated service life of the electrodes was extended from 8.0 min to 78.2 h (500 mA/cm2); although the NB degradation rate decreased from 94.1 to 80.6%, the total amount of theoretical catalytic degradation of NB in the effective working time increased from 17.4 to 8754.1 mg/cm2. These findings reveal good application potential for the electrodes and provide a reference for developing efficient and stable electrode materials.
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Affiliation(s)
- Yang Li
- State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing, 102249, China
| | - Hairun Ma
- College of Chemical Engineering and Environment, China University of Petroleum-Beijing, Beijing, 102249, China
| | - Qianwei Li
- College of Chemical Engineering and Environment, China University of Petroleum-Beijing, Beijing, 102249, China
| | - Guangxu Yan
- College of Chemical Engineering and Environment, China University of Petroleum-Beijing, Beijing, 102249, China
| | - Shaohui Guo
- State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing, 102249, China.
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Wenelska K, Dymerska A, Mijowska E. Oxygen evolution reaction on MoS 2/C rods-robust and highly active electrocatalyst. NANOTECHNOLOGY 2023; 34:465403. [PMID: 37567163 DOI: 10.1088/1361-6528/acef2f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 08/11/2023] [Indexed: 08/13/2023]
Abstract
Recently, water oxidation or oxygen evolution reaction (OER) in electrocatalysis has attracted huge attention due to its prime role in water splitting, rechargeable metal-air batteries, and fuel cells. Here, we demonstrate a facile and scalable fabrication method of a rod-like structure composed of molybdenum disulfide and carbon (MoS2/C) from parent 2D MoS2. This novel composite, induced via the chemical vapor deposition (CVD) process, exhibits superior oxygen evolution performance (overpotential = 132 mV at 10 mA cm-2and Tafel slope = 55.6 mV dec-1) in an alkaline medium. Additionally, stability tests of the obtained structures at 10 mA cm-2during 10 h followed by 20 mA cm-2during 5 h and 50 mA cm-2during 2.5 h have been performed and clearly prove that MoS2/C can be successfully used as robust noble-metal-free electrocatalysts. The promoted activity of the rods is ascribed to the abundance of active surface (ECSA) of the catalyst induced due to the curvature effect during the reshaping of the composite from 2D precursor (MoS2) in the CVD process. Moreover, the presence of Fe species contributes to the observed excellent OER performance. FeOOH, Fe2O3, and Fe3O4are known to possess favorable electrocatalytic properties, including high catalytic activity and stability, which facilitate the electrocatalytic reaction. Additionally, Fe-based species like Fe7C3and FeMo2S5offer synergistic effects with MoS2, leading to improved catalytic activity and durability due to their unique electronic structure and surface properties. Additionally, turnover frequency (TOF) (58 1/s at the current density of 10 mA cm-2), as a direct indicator of intrinsic activity, indicates the efficiency of this catalyst in OER. Based onex situanalyzes (XPS, XRD, Raman) of the electrocatalyst the possible reaction mechanism is explored and discussed in great detail showing that MoS2, carbon, and iron oxide are the main active species of the reaction.
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Affiliation(s)
- Karolina Wenelska
- West Pomeranian University of Technology, Szczecin Faculty of Chemical Technology and Engineering, Department of Nanomaterials Physicochemistry, Piastow Ave. 42, 71-065 Szczecin, Poland
| | - Anna Dymerska
- West Pomeranian University of Technology, Szczecin Faculty of Chemical Technology and Engineering, Department of Nanomaterials Physicochemistry, Piastow Ave. 42, 71-065 Szczecin, Poland
| | - Ewa Mijowska
- West Pomeranian University of Technology, Szczecin Faculty of Chemical Technology and Engineering, Department of Nanomaterials Physicochemistry, Piastow Ave. 42, 71-065 Szczecin, Poland
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6
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Nguyen Tien H, Mwazighe F. Preparation of Ti/SnO 2-Sb/La-βPbO 2 electrode and its application in the degradation of some pollutants including prednisolone and 8-Hydroxyquinoline. CHEMOSPHERE 2023; 333:138933. [PMID: 37187380 DOI: 10.1016/j.chemosphere.2023.138933] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 03/31/2023] [Accepted: 05/11/2023] [Indexed: 05/17/2023]
Abstract
In this work, a novel La-doped βPbO2 (Ti/SnO2-Sb/La-βPbO2) was prepared using electrodeposition method and applied to the degradation of prednisolone (PRD), 8-Hydroxyquinoline (8-HQ), and other typical organic pollutants. Compared with the conventional electrode Ti/SnO2-Sb/βPbO2, La2O3 doping enhanced oxygen evolution potential (OEP), reactive surface area, stability and repeatability of the electrode. The 10 g L-1 of La2O3 doping exhibited the highest electrochemical oxidation capability of the electrode with [•OH]ss being determined at 5.6 × 10-13 M. The quenching experiments were conducted to confirm the main oxidizing species (here: •OH) in the electrochemical process. The study showed that the pollutants were removed in the electrochemical (EC) process with different degradation rates and indicated that the second-order rate constant of organic pollutants towards •OH (kOP,•OH) has a linear relationship with the degradation rate of organic pollutants (kOP) in the electrochemical process. Another new finding in this work is that a regression line of kOP,•OH and kOP can be used to estimate kOP,•OH of an organic chemical, which cannot be determined using the competition method. kPRD,•OH and k8-HQ,•OH were determined to be 7.4 × 109 M-1 s-1 and (4.6-5.5) × 109 M-1 s-1, respectively. Compared with conventional supporting electrolyte (like SO42-), H2PO4- and HPO42- improved kPRD and k8-HQ by 1.3-1.6-fold, while SO32- and HCO3- inhibited kPRD and k8-HQ significantly, down to 80%. Additionally, the degradation pathway of 8-HQ was proposed based on the detection of intermediates from GC-MS.
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Affiliation(s)
- Hoang Nguyen Tien
- The University of Da Nang, University of Science and Education, 459 Ton Duc Thang st., Lien Chieu, Da Nang, 550000, Viet Nam; The University of Da Nang, Environmental Protection and Research Center, 54 Nguyen Luong Bang st., Da Nang, 550000, Viet Nam.
| | - Fredrick Mwazighe
- Department of Chemistry, Faculty of Science and Technology, University of Nairobi, P. O. Box 30197, 00100, Nairobi, Kenya
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Zhang J, Li Y, Xie T, Cui Y, Mao R, Zhao X. Enhanced photoelectrocatalytic oxidation of hypophosphite and simultaneous recovery of metallic nickel via carbon aerogel cathode. JOURNAL OF HAZARDOUS MATERIALS 2023; 448:130601. [PMID: 36746082 DOI: 10.1016/j.jhazmat.2022.130601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 11/30/2022] [Accepted: 12/11/2022] [Indexed: 06/18/2023]
Abstract
Carbon aerogel (CA) cathode was adopted to an undivided-chamber photoelectrocatalytic system with TiO2 nanotube arrays (TNA) photoanode to enhance the oxidation of hypophosphite (H2PO2-) and simultaneous recovery of metallic nickel (Ni). Both the efficiencies of H2PO2- oxidation and Ni recovery were significantly enhanced after replacing Ti or carbon fiber paper cathode with CA cathode. With 1.0 mM H2PO2- and 1.0 mM Ni2+, the ratio of PO43- production increased from ∼41% or ∼54% to ∼100%, and the ratio of Ni recovery increased from ∼20% or ∼ 37% to ∼93% within 180 min at 3.0 V. H2PO2- was finally oxidized to PO43- by •OH radicals, which was speculated to be generated from UV/H2O2 and bound on TNA photoanode. Meanwhile, Ni2+ was eventually electro-reduced to metallic Ni by a two-electron reduction reaction. The efficiencies of H2PO2- oxidation and Ni recovery were favored at higher cell voltage, faintly acid conditions and larger H2PO2- concentration. The stability of this system exhibited that the ratio of PO43- production increased significantly in each cycle, which was attributed to the increase of H2O2 in-situ-generation via CA cathode caused by deposition of metallic Ni. Finally, the treatment of actual electroless nickel plating effluents was demonstrated.
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Affiliation(s)
- Juanjuan Zhang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yibing Li
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, PR China
| | - Tengfei Xie
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, PR China
| | - Yuexin Cui
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Ran Mao
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China
| | - Xu Zhao
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
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Zhang J, Luo J, Zhao X, Wang K, Xie T, Xu T, Qiao M. Enhanced photoelectrocatalytic decomplexation of Ni-EDTA and simultaneous recovery of metallic nickel via TiO 2/Ni-Sb-SnO 2 bifunctional photoanode and activated carbon fiber cathode. J Environ Sci (China) 2023; 126:198-210. [PMID: 36503749 DOI: 10.1016/j.jes.2022.05.023] [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: 03/19/2022] [Revised: 05/15/2022] [Accepted: 05/15/2022] [Indexed: 06/17/2023]
Abstract
In order to enhance Ni-EDTA decomplexation and Ni recovery via photoelectrocatalytic (PEC) process, TiO2/Ni-Sb-SnO2 bifunctional electrode was fabricated as the photoanode and activated carbon fiber (ACF) was introduced as the cathode. At a cell voltage of 3.5 V and initial solution pH of 6.3, the TiO2/Ni-Sb-SnO2 bifunctional photoanode exhibited a synergetic effect on the decomplexation of Ni-EDTA with the pseudo-first-order rate constant of 0.01068 min-1 with 180 min by using stainless steel (SS) cathode, which was 1.5 and 2.4 times higher than that of TiO2 photoanode and Ni-Sb-SnO2 anode, respectively. Moreover, both the efficiencies of Ni-EDTA decomplexation and Ni recovery were improved to 98% from 86% and 73% from 41% after replacing SS cathode with ACF cathode, respectively. Influencing factors on Ni-EDTA decomplexation and Ni recovery were investigated and the efficiencies were favored at acidic condition, higher cell voltage and lower initial Ni-EDTA concentration. Ni-EDTA was mainly decomposed via ·OH radicals which generated via the interaction of O3, H2O2, and UV irradiation in the contrasted PEC system. Then, the liberated Ni2+ ions which liberated from Ni-EDTA decomplexation were eventually reduced to metallic Ni on the ACF cathode surface. Finally, the stability of the constructed PEC system on Ni-EDTA decomplexation and Ni recovery was exhibited.
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Affiliation(s)
- Juanjuan Zhang
- 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 100049, China
| | - Jing Luo
- 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 100049, China; Beijing Drainage Group Co., Ltd., Beijing 100044, China; Beijing Engineering Research Center of Wastewater Resource, Beijing 100124, China
| | - Xu Zhao
- 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 100049, China
| | - Kaifeng Wang
- 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 100049, China
| | - Tengfei Xie
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Tongguang Xu
- Beijing Third Class Tobacco Supervision Station, Beijing 101121, China
| | - Meng Qiao
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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Zhuo Q, Xu X, Xie S, Ren X, Chen Z, Yang B, Li Y, Niu J. Electro-oxidation of Ni (II)-citrate complexes at BDD electrode and simultaneous recovery of metallic nickel by electrodeposition. J Environ Sci (China) 2022; 116:103-113. [PMID: 35219408 DOI: 10.1016/j.jes.2021.05.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 05/19/2021] [Accepted: 05/21/2021] [Indexed: 06/14/2023]
Abstract
The simultaneous electro-oxidation of Ni (II)-citrate and electrodeposition recovery of nickel metal were attempted in a combined electro-oxidation-electrodeposition reactor with a boron-doped diamond (BDD) anode and a polished titanium cathode. Effects of initial nickel citrate concentration, current density, initial pH, electrode spacing, electrolyte type, and initial electrolyte dosage on electrochemical performance were examined. The efficiencies of Ni (II)-citrate removal and nickel metal recovery were determined to be 100% and over 72%, respectively, under the optimized conditions (10 mA/cm2, pH 4.09, 80 mmol/L Na2SO4, initial Ni (II)-citrate concentration of 75 mg/L, electrode spacing of 1 cm, and 180 min of electrolysis). Energy consumption increased with increased current density, and the energy consumption was 0.032 kWh/L at a current density of 10 mA/cm2 (pH 6.58). The deposits at the cathode were characterized by scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). These characterization results indicated that the purity of metallic nickel in cathodic deposition was over 95%. The electrochemical system exhibited a prospective approach to oxidize metal complexes and recover metallic nickel.
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Affiliation(s)
- Qiongfang Zhuo
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Xiaofeng Xu
- School of Civil Engineering, University of South China, Hengyang 421001, China; School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Shuibo Xie
- School of Civil Engineering, University of South China, Hengyang 421001, China.
| | - Xiuwen Ren
- South China Institute of Environmental Sciences, MEE, Guangzhou 510655, China
| | - Zhongying Chen
- South China Institute of Environmental Sciences, MEE, Guangzhou 510655, China
| | - Bo Yang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518071, China
| | - Yanliang Li
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Junfeng Niu
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, China
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10
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Sun Y, Zhang C, Rong H, Wu L, Lian B, Wang Y, Chen Y, Tu Y, Waite TD. Electrochemical Ni-EDTA degradation and Ni removal from electroless plating wastewaters using an innovative Ni-doped PbO 2 anode: Optimization and mechanism. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127655. [PMID: 34773795 DOI: 10.1016/j.jhazmat.2021.127655] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 10/18/2021] [Accepted: 10/27/2021] [Indexed: 06/13/2023]
Abstract
In this work, a novel Ni-doped PbO2 anode (Ni-PbO2) was prepared via a co-electrodeposition method and used to remove Ni-ethylenediaminetetraacetic acid (Ni-EDTA) from solutions typical of electroless nickel plating wastewater. Compared with a pure PbO2 electrode, Ni doping increased the oxygen evolution potential as well as the reactive surface area and reactive site concentration and reduced the electron transfer resistance thereby resulting in superior Ni-EDTA degradation performance. The 1% Ni-doped PbO2 electrode exhibited the best electrochemical oxidation activity with a Ni-EDTA removal efficiency of 96.5 ± 1.2%, a Ni removal efficiency of 52.1 ± 1.4% and an energy consumption of 2.6 kWh m-3. Further investigations revealed that 1% Ni doping enhanced both direct oxidation and hydroxyl radical mediated oxidation processes involved in Ni-EDTA degradation. A mechanism for Ni-EDTA degradation is proposed based on the identified products. The free nickel ion concentration initially increased as a result of the degradation of Ni-EDTA complexes and subsequently decreased as a consequence of nickel electrodeposition on the cathode surface. Further characterization of the cathode deposits by X-ray diffraction and X-ray photoelectron spectra indicated that the deposition products were a mixture of Ni0, NiO and Ni(OH)2 with elemental Ni accounting for roughly 80% of the deposited nickel. Results of this study pave the way for the application of anodic oxidation processes for efficient degradation of Ni-containing complexes and recovery of Ni from nickel-containing wastewaters.
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Affiliation(s)
- Yuyang Sun
- UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Changyong Zhang
- UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Hongyan Rong
- UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Lei Wu
- UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia; UNSW Centre for Transformational Environmental Technologies, Yixing, Jiangsu Province 214206, PR China.
| | - Boyue Lian
- UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
| | - Yuan Wang
- UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia; UNSW Centre for Transformational Environmental Technologies, Yixing, Jiangsu Province 214206, PR China.
| | - Yong Chen
- Jiangsu Provincial Key Laboratory of Environmental Engineering, Jiangsu Provincial Academy of Environmental Science, Nanjing, Jiangsu 210036, PR China.
| | - Yong Tu
- Jiangsu Provincial Academy of Environmental Sciences Environmental Technology Co., Ltd., Nanjing, Jiangsu 210036, PR China.
| | - T David Waite
- UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW 2052, Australia; UNSW Centre for Transformational Environmental Technologies, Yixing, Jiangsu Province 214206, PR China.
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Zhang F, Wang W, Xu L, Zhou C, Sun Y, Niu J. Treatment of Ni-EDTA containing wastewater by electrochemical degradation using Ti 3+ self-doped TiO 2 nanotube arrays anode. CHEMOSPHERE 2021; 278:130465. [PMID: 34126689 DOI: 10.1016/j.chemosphere.2021.130465] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 03/27/2021] [Accepted: 03/31/2021] [Indexed: 06/12/2023]
Abstract
Ethylene diamine tetraacetic acid (EDTA) could form stable complexes with nickel due to its strong chelation. Ni-EDTA has significant impacts on human health because of its acute toxicity and low biodegradability, thus some appropriate approaches are required for its removal. In this research, a Ti3+ self-doped TiO2 nanotube arrays electrode (ECR-TiO2 NTA) was prepared and employed in electrochemical degradation of Ni-EDTA. The oxygen evolution potential of ECR-TiO2 NTA was 2.6 V vs. SCE. More than 96% Ni-EDTA and 88% TOC was removed after reaction for 120 min at current density 2 mA cm-2 at pH 4.34. The degradation of Ni-EDTA was mainly through the cleavage of amine group within Ni-EDTA and furthermore decomposed it into small molecular acids and inorganic ions including NH4+and NO3-. The electro-deposition of nickel ions at cathode was confirmed by XPS and was greatly affected by the pH of solution. The effects of current density, initial Ni-EDTA concentration, initial pH of solution and HCO3- concentration on Ni-EDTA degradation were investigated. The results exhibited that the ECR-TiO2 NTA had excellent efficiencies in electrochemical degradation of Ni-EDTA. The LSV analysis suggested that Ni-EDTA oxidation on ECR-TiO2 NTA anode and the production of hydroxyl radical (·OH) on the anode played an important role in the removal of Ni-EDTA.
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Affiliation(s)
- Fan Zhang
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Weilai Wang
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Lei Xu
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Chengzhi Zhou
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Yanglong Sun
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Junfeng Niu
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China.
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Duan P, Jia X, Lin J, Xia R. Electro-oxidation of ceftazidime in real municipal wastewater using PbO2–Ce and SnO2–Sb electrodes: influence of electrolyte and degradation pathway. J APPL ELECTROCHEM 2020. [DOI: 10.1007/s10800-020-01482-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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13
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Du J, Zhang B, Li J, Lai B. Decontamination of heavy metal complexes by advanced oxidation processes: A review. CHINESE CHEM LETT 2020. [DOI: 10.1016/j.cclet.2020.07.050] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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14
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Cai J, Zhou M, Xu X, Du X. Stable boron and cobalt co-doped TiO 2 nanotubes anode for efficient degradation of organic pollutants. JOURNAL OF HAZARDOUS MATERIALS 2020; 396:122723. [PMID: 32344364 DOI: 10.1016/j.jhazmat.2020.122723] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 04/09/2020] [Accepted: 04/10/2020] [Indexed: 06/11/2023]
Abstract
Anode materials are crucial to anodic oxidation for wastewater treatment. In this regard, stable boron and cobalt co-doped TiO2 nanotube (B, Co-TNT) was prepared for the first time, and its lifetime was found increased significantly while electrocatalytic activity decreased with the increase of Co(NO3)2 in preparation from 1 to 10 mM. Characterized by scanning electron microscope (SEM), X-Ray Diffraction (XRD) and X-ray Photo-electronic Spectroscopy (XPS), B and Co content were optimized and successfully doped on TNT, which was more smooth without ripple with Co content of 0.038 mg/cm2 in a valence of +2, and B atomic content of 2.17 at.% in form of Ti-B-O. This optimized anode enhanced electrode lifetime 122.8 times while the electrochemical activity decreased slightly when compared to the undoped TNT. The effects of current density, initial pH and initial 2,4-dichlorophenoxyacetic acid (2,4-D) concentration were investigated, and the mainly responsible radical for degradation was confirmed to be the surface OH on B, Co-TNT anode. This anode had better performance on the TOC removal, mineralization current density (MCE) and energy consumption (Ec) when compared with BDD, PbO2, DSA and Pt anodes, and it also presented a very stable degradation for 10 cycles oxidation of 20 mg/L 2,4-D with allowable Co leaching. Therefore, B, Co-TNT anode is a promising, stable, safety and cost-effective anode for application in electrochemical advanced oxidation processes (EAOPs).
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Affiliation(s)
- Jingju Cai
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, Nankai University, Tianjin 300350, China; Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Minghua Zhou
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, Nankai University, Tianjin 300350, China; Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
| | - Xin Xu
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, Nankai University, Tianjin 300350, China; Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Xuedong Du
- Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution, Nankai University, Tianjin 300350, China; Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Advanced Water Treatment Technology International Joint Research Center, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
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15
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Mu Y, Huang C, Li H, Chen L, Zhang D, Yang Z. Electrochemical degradation of ciprofloxacin with a Sb-doped SnO2 electrode: performance, influencing factors and degradation pathways. RSC Adv 2019; 9:29796-29804. [PMID: 35531541 PMCID: PMC9071943 DOI: 10.1039/c9ra04860j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 09/04/2019] [Indexed: 11/21/2022] Open
Abstract
Sb-doped SnO2 electrodes were prepared with the practical sol–gel method and were used for the electrocatalytic degradation of ciprofloxacin (CIP) in aqueous solution. Results from the electrochemical characterization (including cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy) showed that the electrode with 16 coating times (SSO-16) had the highest oxygen evolution potential of 2.2 V (vs. SCE) and the highest electrochemically active area of 3.74 cm2. The results of scanning electron microscopy and X-ray diffraction showed that the coating times could affect the surface morphology and crystal structure of the electrodes, and the SSO-16 electrode had a denser surface, higher crystallinity, and smaller grain size (28.6 nm). Moreover, the experimental parameters for CIP degradation with SSO-16 were optimized, and the removal ratio of CIP reached to almost 100% within 60 min. In addition, the possible degradation pathways of CIP were proposed. And the stability and reusability of the SSO-16 electrode were also studied. These results are valuable for the preparation of high electrocatalytic performance electrodes by a sol–gel coating method for electrochemical degradation of antibiotics. Sb-doped SnO2 electrodes with different coating times were prepared by an optimum sol–gel method and the application on the electrocatalytic degradation of ciprofloxacin in aqueous solution were investigated.![]()
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Affiliation(s)
- Yanguang Mu
- Center for Environment and Water Resources
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha 410083
- PR China
| | - Cong Huang
- Center for Environment and Water Resources
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha 410083
- PR China
| | - Haipu Li
- Center for Environment and Water Resources
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha 410083
- PR China
| | - Leilei Chen
- Center for Environment and Water Resources
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha 410083
- PR China
| | - Ding Zhang
- Center for Environment and Water Resources
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha 410083
- PR China
| | - Zhaoguang Yang
- Center for Environment and Water Resources
- College of Chemistry and Chemical Engineering
- Central South University
- Changsha 410083
- PR China
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Xu L, Wang Y, Zhang W. Preparation of a SnO2–Sb electrode on a novel TiO2 network structure with long service lifetime for degradation of dye wastewater. RSC Adv 2019; 9:39242-39251. [PMID: 35540643 PMCID: PMC9076081 DOI: 10.1039/c9ra05713g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 11/21/2019] [Indexed: 12/02/2022] Open
Abstract
Developing effective electrodes with long service lifetime for electrochemical degradation of dyes is of paramount importance for their practical industrial applications. We constructed a novel SnO2–Sb electrode (Ti/TiO2-NW/SnO2–Sb electrode) based on a uniform TiO2 network structure decorated Ti plate (Ti/TiO2-NW) for a long-term electrocatalytic performance. The SnO2–Sb coating layer on this electrode was grown on the Ti/TiO2-NW by pulse electrodeposition. The introduction of the three-dimensional TiO2-NW enhances the bonding strength between the Ti substrate and the SnO2–Sb surface coating. An accelerated life test shows that the service life of Ti/TiO2-NW/SnO2–Sb electrode is 11.15 times longer than that of the traditional Ti/SnO2–Sb electrode. The physicochemical properties of the electrodes were characterized through SEM, EDS, XRD and HRTEM. In addition, through LSV, EIS, CV and voltammetric charge analysis, it is found that compared with the traditional electrode, the Ti/TiO2-NW/SnO2–Sb electrode possesses a higher oxygen evolution potential, a lower charge transfer resistance and a larger electrochemical active surface area. Besides, this novel electrode also exhibits an outstanding electrocatalytic oxidation ability for degradation of acid red 73 in simulated sewage. After a 5 hours' test, the removal efficiency of acid red 73 and the COD reached 98.6% and 71.8%, respectively, which were superior to those of Ti/SnO2–Sb electrode (89.1% and 58.8%). This study highlights the excellent stability of the Ti/TiO2-NW/SnO2–Sb electrode and provides an energy-efficient strategy for dye degradation. A novel TiO2 network structure modified SnO2–Sb electrode has been prepared by electrodeposition with long service lifetime and low energy consumption.![]()
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Affiliation(s)
- Li Xu
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300350
- People's Republic of China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology
| | - Ye Wang
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300350
- People's Republic of China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology
| | - Wen Zhang
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300350
- People's Republic of China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology
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17
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Duan P, Hu X, Ji Z, Yang X, Sun Z. Enhanced oxidation potential of Ti/SnO 2-Cu electrode for electrochemical degradation of low-concentration ceftazidime in aqueous solution: Performance and degradation pathway. CHEMOSPHERE 2018; 212:594-603. [PMID: 30172041 DOI: 10.1016/j.chemosphere.2018.08.123] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 08/22/2018] [Accepted: 08/23/2018] [Indexed: 06/08/2023]
Abstract
In order to develop an efficient electrode to remove pharmaceutical and personal care products from wastewater, copper and antimony doped Ti/SnO2 electrode were prepared by thermal decomposition. Electrochemical characterization was undertaken on Ti/SnO2-Cu using cyclic voltammetry and linear sweep voltammetry, indicating an ultra-high 2.1 V of oxygen evolution potential, better stability, and superior corrosion resistance rather than traditional Ti/SnO2-Sb electrode. Competitive degradation experiments showed more efficient removal rate was achieved on Ti/SnO2-Cu electrode, which could remove more than 90% ceftazidime within 60 min. The microstructure and crystal orientation of the modified electrodes were investigated by scanning electron microscopy, which indicated that the crystal of the Ti/SnO2-Cu electrode grew in more porous and uniform condition, covered with closely arranged layers of the coating. X-ray photoelectron spectroscopy and X-ray diffractions suggested that Cu2O was successfully coated on the Ti/SnO2-Cu electrode surface. The operating parameters of electrochemical degradation process were also investigated, including current density, initial concentration, electrode distance, stirring rate and supporting electrolyte. Consequently, the intermediate products of electrochemical degradation were monitored by liquid chromatography-mass spectrometry and a major degradation pathway was proposed.
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Affiliation(s)
- Pingzhou Duan
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Research Centre for Environmental Pollution Control and Resource Reuse Engineering of Beijing City, Beijing 100029, China
| | - Xiang Hu
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Research Centre for Environmental Pollution Control and Resource Reuse Engineering of Beijing City, Beijing 100029, China.
| | - Zongyuan Ji
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Research Centre for Environmental Pollution Control and Resource Reuse Engineering of Beijing City, Beijing 100029, China
| | - Xiaoming Yang
- College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; Research Centre for Environmental Pollution Control and Resource Reuse Engineering of Beijing City, Beijing 100029, China
| | - Zhirong Sun
- College of Environmental & Energy Engineering, Beijing University of Technology, Beijing 100124, China.
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