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Liu X, Bi G, Fang Y, Wei C, Song J, Wang YX, Zheng X, Sun Q, Wang Y, Wang G, Mu Y. Regulating Surface Dipole Moments of TiO 2 for the pH-Universal Cathodic Fenton-Like Process. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:9436-9445. [PMID: 38691809 DOI: 10.1021/acs.est.4c02577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
Although electro-Fenton (EF) processes can avoid the safety risks raised by concentrated hydrogen peroxide (H2O2), the Fe(III) reduction has always been either unstable or inefficient at high pH, resulting in catalyst deactivation and low selectivity of H2O2 activation for producing hydroxyl radicals (•OH). Herein, we provided a strategy to regulate the surface dipole moment of TiO2 by Fe anchoring (TiO2-Fe), which, in turn, substantially increased the H2O2 activation for •OH production. The TiO2-Fe catalyst could work at pH 4-10 and maintained considerable degradation efficiency for 10 cycles. Spectroscopic analysis and a theoretical study showed that the less polar Fe-O bond on TiO2-Fe could finely tune the polarity of H2O2 to alter its empty orbital distribution, contributing to better ciprofloxacin degradation activity within a broad pH range. We further verified the critical role of the weakened polarity of H2O2 on its homolysis into •OH by theoretically and experimentally investigating Cu-, Co-, Ni-, Mn-, and Mo-anchored TiO2. This concept offers an avenue for elaborate design of green, robust, and pH-universal cathodic Fenton-like catalysts and beyond.
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Affiliation(s)
- Xiaocheng Liu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China
- Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Guangyu Bi
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Yanyan Fang
- Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Cong Wei
- Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Junsheng Song
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Yi-Xuan Wang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Xusheng Zheng
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China
| | - Qian Sun
- CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Yang Wang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, 14476 Potsdam, Germany
| | - Gongming Wang
- Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Yang Mu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China
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2
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Zhang T, Zhu J, Xie M, Meng K, Yao G, Pan T, Gao M, Cheng H, Lin Y. Highly Sensitive Wearable Sensor Based on (001)-Orientated TiO 2 for Real-Time Electrochemical Detection of Dopamine, Tyrosine, and Paracetamol. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2312238. [PMID: 38319031 DOI: 10.1002/smll.202312238] [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: 12/29/2023] [Revised: 01/22/2024] [Indexed: 02/07/2024]
Abstract
The concentration of dopamine (DA) and tyrosine (Tyr) reflects the condition of patients with Parkinson's disease, whereas moderate paracetamol (PA) can help relieve their pain. Therefore, real-time measurements of these bioanalytes have important clinical implications for patients with Parkinson's disease. However, previous sensors suffer from either limited sensitivity or complex fabrication and integration processes. This work introduces a simple and cost-effective method to prepare high-quality, flexible titanium dioxide (TiO2) thin films with highly reactive (001)-facets. The as-fabricated TiO2 film supported by a carbon cloth electrode (i.e., TiO2-CC) allows excellent electrochemical specificity and sensitivity to DA (1.390 µA µM-1 cm-2), Tyr (0.126 µA µM-1 cm-2), and PA (0.0841 µA µM-1 cm-2). More importantly, accurate DA concentration in varied pH conditions can be obtained by decoupling them within a single differential pulse voltammetry measurement without additional sensing units. The TiO2-CC electrochemical sensor can be integrated into a smart diaper to detect the trace amount of DA or an integrated skin-interfaced patch with microfluidic sampling and wireless transmission units for real-time detection of the sweat Try and PA concentration. The wearable sensor based on TiO2-CC prepared by facile manufacturing methods holds great potential in the daily health monitoring and care of patients with neurological disorders.
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Affiliation(s)
- Tianyao Zhang
- School of Material and Energy, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Jia Zhu
- School of Material and Energy, University of Electronic Science and Technology of China, Chengdu, 610054, China
- Yangtze Delta Region Institute (Quzhou), University of Electronic Science and Technology of China, Quzhou, 324000, China
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - Maowen Xie
- School of Material and Energy, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Ke Meng
- School of Material and Energy, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Guang Yao
- School of Material and Energy, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Taisong Pan
- School of Material and Energy, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Min Gao
- School of Material and Energy, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Huanyu Cheng
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - Yuan Lin
- School of Material and Energy, University of Electronic Science and Technology of China, Chengdu, 610054, China
- Medico-Engineering Cooperation on Applied Medicine Research Center, University of Electronics Science and Technology of China, Chengdu, 610054, China
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3
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Wu JC, Chuang YH, Liou SYH, Li Q, Hou CH. In situ engineering of highly conductive TiO 2/carbon heterostructure fibers for enhanced electrocatalytic degradation of water pollutants. JOURNAL OF HAZARDOUS MATERIALS 2022; 429:128328. [PMID: 35114455 DOI: 10.1016/j.jhazmat.2022.128328] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 12/27/2021] [Accepted: 01/19/2022] [Indexed: 06/14/2023]
Abstract
Rational design of nanocomposite electrode materials with high conductivity, activity, and mechanical strength is critical in electrocatalysis. Herein, freestanding, flexible heteronanocomposites were fabricated in situ by carbonizing electrospun fibers with TiO2 nanoparticles on the surface for electrocatalytic degradation of water pollutants. The carbonization temperature was observed as a dominant parameter affecting the characteristics of the electrodes. As the carbonization temperature increased to 1000 °C, the conductivity of the electrode was significantly enhanced due to the high degree of graphitization (ID/IG ratio 1.10) and the dominant rutile phase. Additionally, the formation of TiO2 protrusions and the C-Ti heterostructure were observed at 1000 °C, which contributed to increasing the electrocatalytic activity. When 1.5 V (vs. Ag/AgCl) was employed, electrocatalytic experiments using the electrode achieved 90% degradation of crystal violet and 10.9-87.5% for an array of micropollutants. The electrical energy-per-order (EEO) for the removal of crystal violet was 0.7 kWh/m3/order, indicative of low-energy requirement. The efficient electrocatalytic activity can be ascribed to the fast electron transfer and the strong ability to generate hydroxyl radicals. Our findings expand efforts for the design of highly conductive heteronanocomposites in a facile in situ approach, providing a promising perspective for the energy-efficient electrocatalytic degradation of water pollutants.
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Affiliation(s)
- Jhen-Cih Wu
- Graduate Institute of Environmental Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Yi-Hsueh Chuang
- Institute of Environmental Engineering, National Yang Ming Chiao Tung University, 1001 University Road, East District, Hsinchu 30010, Taiwan
| | - Sofia Ya Hsuan Liou
- Department of Geosciences, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan; Research Center for Future Earth, National Taiwan University, No. 1, Section 4. Roosevelt Rd., Taipei 10617, Taiwan
| | - Qilin Li
- Department of Civil and Environmental Engineering, Rice University, 6100 Main Street MS 519, Houston, TX 77005, USA; Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, 6100 Main Street MS 6398, Houston, TX 77005, USA
| | - Chia-Hung Hou
- Graduate Institute of Environmental Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan; Research Center for Future Earth, National Taiwan University, No. 1, Section 4. Roosevelt Rd., Taipei 10617, Taiwan.
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4
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Theerthagiri J, Lee SJ, Karuppasamy K, Park J, Yu Y, Kumari MLA, Chandrasekaran S, Kim HS, Choi MY. Fabrication strategies and surface tuning of hierarchical gold nanostructures for electrochemical detection and removal of toxic pollutants. JOURNAL OF HAZARDOUS MATERIALS 2021; 420:126648. [PMID: 34329090 DOI: 10.1016/j.jhazmat.2021.126648] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 07/10/2021] [Accepted: 07/12/2021] [Indexed: 05/20/2023]
Abstract
The intensive research on the synthesis and characterization of gold (Au) nanostructures has been extensively documented over the last decades. These investigations allow the researchers to understand the relationships between the intrinsic properties of Au nanostructures such as particle size, shape, morphology, and composition to synthesize the Au nano/hybrid nanostructures with novel physicochemical properties. By tuning the properties above, these nanostructures are extensively employed to detect and remove trace amounts of toxic pollutants from the environment. This review attempts to document the achievements and current progress in Au-based nanostructures, general synthetic and fabrication strategies and their utilization in electrochemical sensing and environmental remediation applications. Additionally, the applications of Au nanostructures (e.g., as adsorbents, sensing platforms, catalysts, and electrodes) and advancements in the field of electrochemical sensing of different target analytes (e.g., proteins, nucleic acids, heavy metals, small molecules, and antigens) are summarized. The literature survey concludes the existing methods for the detection of toxic contaminants at various concentration levels. Finally, the existing challenges and future research directions on electrochemical sensing and degradation of toxic contaminants using Au nanostructures are defined.
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Affiliation(s)
- Jayaraman Theerthagiri
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry (BK21 FOUR), Research Institute of Natural Sciences, Gyeongsang National University, Jinju 52828, South Korea
| | - Seung Jun Lee
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry (BK21 FOUR), Research Institute of Natural Sciences, Gyeongsang National University, Jinju 52828, South Korea
| | - K Karuppasamy
- Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul 04620, Republic of Korea
| | - Juhyeon Park
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry (BK21 FOUR), Research Institute of Natural Sciences, Gyeongsang National University, Jinju 52828, South Korea
| | - Yiseul Yu
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry (BK21 FOUR), Research Institute of Natural Sciences, Gyeongsang National University, Jinju 52828, South Korea
| | - M L Aruna Kumari
- Department of Chemistry, M.S. Ramaiah College of Arts, Science and Commerce, Bengaluru 560054, India
| | - Sivaraman Chandrasekaran
- Center of Excellence in Environmental Studies, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Hyun-Seok Kim
- Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul 04620, Republic of Korea
| | - Myong Yong Choi
- Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry (BK21 FOUR), Research Institute of Natural Sciences, Gyeongsang National University, Jinju 52828, South Korea.
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5
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Shao C, Lin L, Duan L, Jiang Y, Shao Q, Cao H. Nickel-enhanced electrochemical activities of shape-tailored TiO2{001} nanocrystals for water treatment: A combined experimental and DFT studies. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138066] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Pirsaheb M, Hoseini H, Abtin V. Photoelectrocatalytic degradation of humic acid and disinfection over Ni TiO2-Ni/ AC-PTFE electrode under natural sunlight irradiation: Modeling, optimization and reaction pathway. J Taiwan Inst Chem Eng 2021. [DOI: 10.1016/j.jtice.2020.12.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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7
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Zhang Y, Chen Z, Wu P, Duan Y, Zhou L, Lai Y, Wang F, Li S. Three-dimensional heterogeneous Electro-Fenton system with a novel catalytic particle electrode for Bisphenol A removal. JOURNAL OF HAZARDOUS MATERIALS 2020; 393:120448. [PMID: 32155519 DOI: 10.1016/j.jhazmat.2019.03.067] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 03/04/2019] [Accepted: 03/16/2019] [Indexed: 06/10/2023]
Abstract
Herein, a novel three-dimensional (3D) heterogeneous Electro-Fenton (EF) system with improved gas diffusion electrode (GDE) as cathode and magnetic nitrogen doped/reduced graphene oxide (Fe3O4/N-rGO) as catalytic particle electrodes (CPEs) was built for Bisphenol A (BPA) removal. The Fe3O4/N-rGO served as both particle electrodes and heterogeneous catalyst. The study concluded that BPA could be effectively removed via this hybrid system. The synergistic effect between the 3D electrode and EF system was discussed by comparing the performance of different functional particle electrodes. The 3D electrode system exhibited a larger specific surface area electrode, which improved the mass transfer of pollutants to electrode, and also accelerated the regeneration of FeⅡ due to faster electron transfer, thereby enhancing the efficiency of EF catalysis. The EF process promotes the regeneration rate of particle electrodes and thus accelerates the 3D electrode reaction course. The parameters affecting degradation behavior of BPA were optimized. As a result, optimal removal rate of BPA and TOC was 93% and 60.5%, respectively within 90 min. The CPEs showed high catalytic performance (86.5% for BPA and 50.3% for TOC) and low catalyst loss (less than 9.5%) after 5 cycles, indicating its excellent stability and reusability. The possible mechanism of 3D heterogeneous EF was investigated by comparing the catalytic activity and •OH production capacity of homogeneous EF and Fenton-like. Built on the analysis of intermediates, a possible decomposition pathway of BPA was proposed.
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Affiliation(s)
- Yimei Zhang
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China; Laboratory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu,215213, China.
| | - Zhuang Chen
- Laboratory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu,215213, China
| | - Panpan Wu
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China
| | - Yaxiao Duan
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China
| | - Lincheng Zhou
- Laboratory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu,215213, China
| | - Yuxian Lai
- MOE Key Laboratory of Resources and Environmental System Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China
| | - Fei Wang
- Laboratory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu,215213, China
| | - Shuai Li
- Laboratory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu,215213, China
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8
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Wang A, Wang W, Chen J, Mao R, Pang Y, Li Y, Chen W, Chen D, Hao D, Ni BJ, Saunders M, Jia G. Dominant Polar Surfaces of Colloidal II-VI Wurtzite Semiconductor Nanocrystals Enabled by Cation Exchange. J Phys Chem Lett 2020; 11:4990-4997. [PMID: 32498513 DOI: 10.1021/acs.jpclett.0c01372] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Polar surfaces of ionic crystals are of growing technological importance, with implications for the efficiency of photocatalysts, gas sensors, and electronic devices. The creation of ionic nanocrystals with high percentages of polar surfaces is an option for improving their efficiency in the aforementioned applications but is hard to accomplish because they are less thermodynamically stable and prone to vanish during the growth process. Herein, we develop a strategy that is capable of producing polar surface-dominated II-VI semiconductor nanocrystals, including ZnS and CdS, from copper sulfide hexagonal nanoplates through cation exchange reactions. The obtained wurtzite ZnS hexagonal nanoplates have dominant {002} polar surfaces, occupying up to 97.8% of all surfaces. Density functional theory calculations reveal the polar surfaces can be stabilized by a charge transfer of 0.25 eV/formula from the anion-terminated surface to the cation-terminated surface, which also explains the presence of polar surfaces in the initial Cu1.75S hexagonal nanoplates with cation deficiency prior to cation exchange reactions. Experimental results showed that the HER activity could be boosted by the surface polarization of polar surface-dominated ZnS hexagonal nanoplates. We anticipate this strategy is general and could be used with other systems to prepare nanocrystals with dominant polar surfaces. Furthermore, the availability of colloidal semiconductor nanocrystals with dominant polar surfaces produced through this strategy opens a new avenue for improving their efficiency in catalysis, photocatalysis, gas sensing, and other applications.
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Affiliation(s)
- Aixiang Wang
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276005, P. R. China
| | - Wenjie Wang
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276005, P. R. China
| | - Jiayi Chen
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Rundong Mao
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Yingping Pang
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Yunguo Li
- Department of Earth Sciences, Faculty of Mathematical and Physical Sciences, University College London, Gower Street, London WC1E 6BT, U.K
| | - Wei Chen
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Dechao Chen
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia
| | - Derek Hao
- Centre for Technology in Water and Wastewater (CTWW), School of Civil and Environmental Engineering, University of Technology Sydney (UTS), Ultimo, NSW 2007, Australia
| | - Bing-Jie Ni
- Centre for Technology in Water and Wastewater (CTWW), School of Civil and Environmental Engineering, University of Technology Sydney (UTS), Ultimo, NSW 2007, Australia
| | - Martin Saunders
- Centre for Microscopy, Characterization and Analysis (CMCA), The University of Western Australia, Clawley, WA 6009, Australia
| | - Guohua Jia
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Bentley, WA 6102, Australia
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9
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Holi AM, Al-Zahrani AA, Najm AS, Chelvanathan P, Amin N. PbS/CdS/ZnO nanowire arrays: Synthesis, structural, optical, electrical, and photoelectrochemical properties. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137486] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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10
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Zhang AY, Zhou Y, Liu X, Huang NH, Niu HH. Photochemical pollutant degradation on facet junction-engineered TiO 2 promoted by organic arsenical: Governing roles of arsenic-terminated surface chemistry and bulk-free radical speciation. JOURNAL OF HAZARDOUS MATERIALS 2020; 390:122159. [PMID: 31999957 DOI: 10.1016/j.jhazmat.2020.122159] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 01/17/2020] [Accepted: 01/20/2020] [Indexed: 06/10/2023]
Abstract
Photochemical oxidation based on semiconducting metal oxides is an efficient strategy to remove environmental pollutants in water, air and soil. The fine manipulation of photo-carriers separation, surface chemistry and radical speciation is of considerable interest for environmental remediation. In this work, the morphology- and structure-tailored TiO2 single crystals with epitaxial {101}/{001} facet junction were designed, prepared and tested for photochemical pollutant oxidation in the presence of organic arsenicals, the main component in swine wastewater from livestock industry, although they have been forbidden for several years. The facet junction-tailored TiO2 deserved an efficient photo-carriers separation with high quantum efficiency. The photochemical oxidation of 4-chlorophenol (4-CP), phenol and bisphenol A (BPA) was substantially improved by roxarsone (ROX). ROX-enhanced photochemical activity of TiO2 was mainly attributed to the in-situ arsenic-terminated surface chemistry by Ti-OAsVO3/-OAsIIIO2. This surface played governing roles in water/TiO2 interactions, and changed water adsorption from dissociative to molecular configuration. Furthermore, ·OH was finely regulated from low-activity surface-bound to high-activity bulk-free speciation between as-generated photo-holes with free water molecules. Our findings provided a new chance to refine the TiO2-based photochemical oxidation, and a modifying technology to treat swine wastewater from livestock industry with much reduced secondary pollution.
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Affiliation(s)
- Ai-Yong Zhang
- Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Yang Zhou
- Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Xiao Liu
- Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Nai-Hui Huang
- Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Hai-Hong Niu
- School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, 230009, China
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11
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Carreño-Lizcano M, Gualdrón-Reyes AF, Rodríguez-González V, Pedraza-Avella J, Niño-Gómez M. Photoelectrocatalytic phenol oxidation employing nitrogen doped TiO2-rGO films as photoanodes. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.02.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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12
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Wang J, Zhuan R. Degradation of antibiotics by advanced oxidation processes: An overview. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 701:135023. [PMID: 31715480 DOI: 10.1016/j.scitotenv.2019.135023] [Citation(s) in RCA: 413] [Impact Index Per Article: 103.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 10/15/2019] [Accepted: 10/15/2019] [Indexed: 05/03/2023]
Abstract
Antibiotics are becoming emerging contaminants due to their extensive production and consumption, which have caused hazards to the ecological environment and human health. Various techniques have been studied to remove antibiotics from water and wastewater, including biological, physical and chemical methods. Among them, advanced oxidation processes (AOPs) have received increasing attention due to their fast reaction rate and strong oxidation capability, which are effective for the degradation of antibiotics in aquatic environments. In this review paper, a variety of AOPs, such as Fenton or Fenton-like reaction, ozonation or catalytic ozonation, photocatalytic oxidation, electrochemical oxidation, and ionizing radiation were briefly introduced, including their principles, characteristics, main influencing factors and applications. The current applications of AOPs for the degradation of antibiotics in water and wastewater were analyzed and summarized, the concluding remarks were given and their future perspectives and challenges were discussed.
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Affiliation(s)
- Jianlong Wang
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China; Beijing Key Laboratory of Radioactive Waste Treatment, Tsinghua University, Beijing 100084, PR China.
| | - Run Zhuan
- Laboratory of Environmental Technology, INET, Tsinghua University, Beijing 100084, PR China
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13
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Zhu JS, Yang H, Zhang W, Mao Y, Lyu SS, Chen J. An In situ Raman study of intermediate adsorption engineering by high-index facet control during the hydrogen evolution reaction. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00124d] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
An in situ Raman study of the mechanism of HER catalytic performance enhanced by high-index facets on Ti@TiO2 nanosheets.
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Affiliation(s)
- Jia-sen Zhu
- School of Chemical Engineering and Technology
- Sun Yat-sen University
- Zhuhai 519082
- China
| | - Hao Yang
- School of Materials Science and Engineering
- Instrumental Analysis and Research Center
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Weihong Zhang
- School of Materials Science and Engineering
- Instrumental Analysis and Research Center
- Sun Yat-sen University
- Guangzhou 510275
- China
| | - Yanchao Mao
- MOE Key Laboratory of Materials Physics
- School of Physics and Microelectronics
- Zhengzhou University
- Zhengzhou 450001
- China
| | - Shu-shen Lyu
- School of Materials
- Sun Yat-sen University
- Guangzhou 510006
- China
| | - Jian Chen
- MOE Key Laboratory of Materials Physics
- School of Physics and Microelectronics
- Zhengzhou University
- Zhengzhou 450001
- China
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14
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Liu C, Min Y, Zhang AY, Si Y, Chen JJ, Yu HQ. Electrochemical treatment of phenol-containing wastewater by facet-tailored TiO 2: Efficiency, characteristics and mechanisms. WATER RESEARCH 2019; 165:114980. [PMID: 31434012 DOI: 10.1016/j.watres.2019.114980] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 08/10/2019] [Accepted: 08/12/2019] [Indexed: 06/10/2023]
Abstract
Electrochemical oxidation is widely used for water and wastewater treatment. Anodic material is crucial and the shape-tailored {001}-exposed TiO2 has been proven to be an ideal electrode material for pollutant oxidation. In this work, the electrochemical treatment of wastewater containing typical p-substituted phenols by facet-tailored TiO2 is studied in terms of efficiency, characteristics and mechanisms. Experimental results demonstrate that the anodic oxidation of p-substituted phenols becomes more difficult with the increasing Hammett's constant (σ) of phenols, while their degradation rates (k) increase continuously with the initial surface concentration (Γ). Phenols are degraded mainly by surface-bound ·OH and direct electron transfer on the TiO2/Ti electrode, rather than by bulk-free ·OH suspended in the aqueous phase. Theoretical calculations reveal that the surface-bound ·OH-mediated oxidation mechanism is attributed mainly to the strong surface bond strength between shape-tailored TiO2 and water molecule as well as the reactive ·OH. Such strong interactions are associated with the higher density of atomic steps, edges and kinks of low-coordinate surface atoms with a large number dangling bonds on the high-energy {001} polar facet. For practical treatment of real wastewater with different matrixes, the facet-tailored TiO2/Ti electrode exhibits both a high efficiency and a fast kinetics. Our findings provide a new chance to degrade phenolic pollutants in wastewater and offer atomic-scale insights into the preparation, modification and application of TiO2-based anodic materials for electrochemical water treatment.
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Affiliation(s)
- Chang Liu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Yuan Min
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Ai-Yong Zhang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China; Department of Municipal Engineering, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Yang Si
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Jie-Jie Chen
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China.
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China
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15
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Liu C, Zhang AY, Si Y, Pei DN, Yu HQ. Photochemical Protection of Reactive Sites on Defective TiO 2- x Surface for Electrochemical Water Treatment. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:7641-7652. [PMID: 31150211 DOI: 10.1021/acs.est.9b01307] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The electrode is the key in electrochemical process for water and wastewater treatment. Many nonstoichiometric metal oxides are active electrode materials but have poor stability under strong anodic polarization due to their susceptible nature of the oxygen vacancies on surface and subsurface as defective reactive sites. In this work, a novel photochemical protecting strategy is proposed to stabilize the defective reactive sites on the TiO2- x surface and subsurface for long-term anodic oxidation of pollutants. With this strategy, a novel photoassisted electrochemical system at low anodic bias is further constructed. Such a system exhibits a high protecting capacity at a low operation cost for electrochemical degradation of bisphenol A (BPA), a typical persistent organic pollutant. Its excellent photochemical protecting capacity is found to be mainly attributed to the mild non-band-gap excitation pathways on the defective TiO2- x electrode under both visible-light irradiation and moderate anodic polarization. Under real sunlight irradiation, a 20 run cyclic test for BPA degradation demonstrates the excellent performance and stability of the constructed system at low bias without significant oxygen evolution. Our work provides a new opportunity to utilize the defective and reactive TiO2- x for efficient, stable, and cost-effective electrochemical water treatment with the aid of its photo- and electrochemical bifunctional properties.
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Affiliation(s)
- Chang Liu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry , University of Science and Technology of China , Hefei , 230026 , China
| | - Ai-Yong Zhang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry , University of Science and Technology of China , Hefei , 230026 , China
- Department of Municipal Engineering , Hefei University of Technology , Hefei , 230009 , China
| | - Yang Si
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry , University of Science and Technology of China , Hefei , 230026 , China
| | - Dan-Ni Pei
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry , University of Science and Technology of China , Hefei , 230026 , China
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry , University of Science and Technology of China , Hefei , 230026 , China
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16
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Si Y, Zhang AY, Liu C, Pei DN, Yu HQ. Photo-assisted electrochemical detection of bisphenol A in water samples by renewable {001}-exposed TiO 2 single crystals. WATER RESEARCH 2019; 157:30-39. [PMID: 30952006 DOI: 10.1016/j.watres.2019.03.088] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 03/16/2019] [Accepted: 03/27/2019] [Indexed: 06/09/2023]
Abstract
Bisphenol A (BPA) is a semi-persistent environmental endocrine disrupter and widely present in aqueous environments. Electrochemical detection is an effective method to monitor pollutants like BPA in aqueous environments. However, the electrode fouling from anodic polymeric products is one main barrier of electrochemical sensors for their practical applications. In this work, a renewable electrochemical sensor was rationally designed, constructed and tested for efficient BPA detection. The TiO2 anodic material was surface-engineered by inorganic-framework molecular imprinting sites with tailored morphological shape, exposed facet and crystal structure. This electrode could be activated mainly as an electrochemical catalyst and partially as a photochemical catalyst. The developed TiO2-based sensor exhibited a good detection reliability and cyclic stability for determining BPA in water samples, with an electrochemical signal decrease of less than 5.0% in 10-run cyclic tests. By virtue of the bi-functional properties of the tailored TiO2 anodic material, a unique photo-assisted electrochemical sensor was further developed, in which analyte digestion and analytical signal originated mainly from anodic conversion. Such a synergistic digesting mechanism distinguishes it from the reported electro-assisted photochemical TiO2 sensors. Our work provides a robust sensor for monitoring pollutants in aqueous environments and a new opportunity to develop renewable electrode materials with good reusability.
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Affiliation(s)
- Yang Si
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Ai-Yong Zhang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China; Department of Municipal Engineering, School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei, 230009, China.
| | - Chang Liu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Dan-Ni Pei
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, China.
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17
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Zhang J, Zhou D, Dong S, Ren N. Respective construction of Type-II and direct Z-scheme heterostructure by selectively depositing CdS on {001} and {101} facets of TiO 2 nanosheet with CDots modification: A comprehensive comparison. JOURNAL OF HAZARDOUS MATERIALS 2019; 366:311-320. [PMID: 30530023 DOI: 10.1016/j.jhazmat.2018.12.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 11/26/2018] [Accepted: 12/03/2018] [Indexed: 06/09/2023]
Abstract
Directional deposition has always been a focus issue in the construction of specific heterostructure. Herein, for the first time, we have demonstrated that the CdS could be selectively deposited on {001} or {101} facets of TiO2 nanosheet, and two different charge transfer processes were formed. First, the selective deposition of CdS on {001} facets of TiO2 nanosheet ({001}TiO2/CdS) would form the Type-II heterostructure, which seriously weakened the redox ability of {001}TiO2/CdS and directly resulted in the low photocatalytic performance (4-Chlorophenol (4-CP), 61.92% in 40 min) and serious photocorrosion of CdS. In contrary, the selective deposition of CdS on {101} facets of TiO2 nanosheet ({101}TiO2/CdS) could construct direct Z-scheme heterostructure with significantly increased photocatalytic 4-CP degradation efficiency (96.12%), much higher than pristine TiO2 nanosheet (87.21%). The hybrids were further modified by carbon nanodots (CDots) ({101}TiO2/CdS/CDots) to enhance photocatalytic performance (99.84%). The obtained direct Z-scheme {101}TiO2/CdS/CDots showed excellent stability and anti-photocorrosion ability. The synergistic effect between TiO2 nanosheet, CdS and CDots was expounded through characterization analyses, and the photocatalytic reaction mechanism was proposed in detail. Toxicity assessment authenticated good biocompatibility and low cytotoxicity of {101}TiO2/CdS/CDots. Our discovery was expected to drive great advances in the use of TiO2 nanosheet for environmental remediation.
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Affiliation(s)
- Jun Zhang
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, Jilin, China
| | - Dandan Zhou
- School of Environment, Northeast Normal University, Changchun 130117, China
| | - Shuangshi Dong
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, 130021, Jilin, China.
| | - Nanqi Ren
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China
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18
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Qu S, Xiong Y. Environment-friendly Ag/CDots/g-C3N4 photocatalysts: Remarkably enhanced photocatalytic tetracycline degradation in visible light. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.07.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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19
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Li D, Guo X, Song H, Sun T, Wan J. Preparation of RuO 2-TiO 2/Nano-graphite composite anode for electrochemical degradation of ceftriaxone sodium. JOURNAL OF HAZARDOUS MATERIALS 2018; 351:250-259. [PMID: 29550559 DOI: 10.1016/j.jhazmat.2018.03.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 03/05/2018] [Accepted: 03/06/2018] [Indexed: 06/08/2023]
Abstract
Graphite-like material is widely used for preparing various electrodes for wastewater treatment. To enhance the electrochemical degradation efficiency of Nano-graphite (Nano-G) anode, RuO2-TiO2/Nano-G composite anode was prepared through the sol-gel method and hot-press technology. RuO2-TiO2/Nano-G composite was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and N2 adsorption-desorption. Results showed that RuO2, TiO2 and Nano-G were composited successfully, and RuO2 and TiO2 nanoparticles were distributed uniformly on the surface of Nano-G sheet. Specific surface area of RuO2-TiO2/Nano-G composite was higher than that of TiO2/Nano-G composite and Nano-G. Electrochemical performances of RuO2-TiO2/Nano-G anode were investigated by cyclic voltammetry, electrochemical impedance spectroscopy. RuO2-TiO2/Nano-G anode was applied to electrochemical degradation of ceftriaxone. The generation of hydroxyl radical (OH) was measured. Results demonstrated that RuO2-TiO2/Nano-G anode displayed enhanced electrochemical degradation efficiency towards ceftriaxone and yield of OH, which is derived from the synergetic effect between RuO2, TiO2 and Nano-G, which enhance the specific surface area, improve the electrochemical oxidation activity and lower the charge transfer resistance. Besides, the possible degradation intermediates and pathways of ceftriaxone sodium were identified. This study may provide a viable and promising prospect for RuO2-TiO2/Nano-G anode towards effective electrochemical degradation of antibiotics from wastewater.
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Affiliation(s)
- Dong Li
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China; School of Chemistry, Chemical Engineering and Materials, Department of Environmental Science and Engineering, Heilongjiang University, Harbin 150080, China.
| | - Xiaolei Guo
- School of Chemistry, Chemical Engineering and Materials, Department of Environmental Science and Engineering, Heilongjiang University, Harbin 150080, China
| | - Haoran Song
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Tianyi Sun
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Jiafeng Wan
- School of Chemistry, Chemical Engineering and Materials, Department of Environmental Science and Engineering, Heilongjiang University, Harbin 150080, China
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20
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Pei DN, Zhang AY, Pan XQ, Si Y, Yu HQ. Electrochemical Sensing of Bisphenol A on Facet-Tailored TiO2 Single Crystals Engineered by Inorganic-Framework Molecular Imprinting Sites. Anal Chem 2018; 90:3165-3173. [DOI: 10.1021/acs.analchem.7b04466] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Dan-Ni Pei
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China
| | - Ai-Yong Zhang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China
- Department of Municipal Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Xiao-Qiang Pan
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China
| | - Yang Si
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China
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21
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Liu C, Zhang AY, Si Y, Pei DN, Yu HQ. Photochemical Anti-Fouling Approach for Electrochemical Pollutant Degradation on Facet-Tailored TiO 2 Single Crystals. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:11326-11335. [PMID: 28891634 DOI: 10.1021/acs.est.7b04105] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Electrochemical degradation of refractory pollutants at low bias before oxygen evolution exhibits high current efficiency and low energy consumption, but its severe electrode fouling largely limits practical applications. In this work, a new antifouling strategy was developed and validated for electrochemical pollutant degradation by photochemical oxidation on facet-tailored {001}-exposed TiO2 single crystals. Electrode fouling from anodic polymers at a low bias was greatly relieved by the free ·OH-mediated photocatalysis under UV irradiation, thus efficient and stable degradation of bisphenol A, a typical environmental endocrine disrupter, and treatment of landfill leachate were accomplished without remarkable oxygen evolution in synergistic photoassisted electrochemical system. Electrochemical and spectroscopic measurements indicated a clean electrode surface during cyclic pollutant degradation. Such a photochemical antifouling strategy for low-bias anodic pollutants degradation was mainly attributed to the improved electric conductivity and excellent electrochemical and photochemical activities of tailored TiO2 anodic material, whose unique properties originated from the favorable surface atomic and electronic structures of high-energy {001} polar facet and single-crystalline structure. Our work opens up a brand new approach to develop catalytic systems for efficient degradation of refractory contaminants in water and wastewater.
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Affiliation(s)
- Chang Liu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026, China
| | - Ai-Yong Zhang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026, China
- Department of Municipal Engineering, Hefei University of Technology , Hefei, 230009, China
| | - Yang Si
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026, China
| | - Dan-Ni Pei
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026, China
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026, China
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22
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Chen Z, Zhang Y, Zhou L, Zhu H, Wan F, Wang Y, Zhang D. Performance of nitrogen-doped graphene aerogel particle electrodes for electro-catalytic oxidation of simulated Bisphenol A wastewaters. JOURNAL OF HAZARDOUS MATERIALS 2017; 332:70-78. [PMID: 28282572 DOI: 10.1016/j.jhazmat.2017.02.048] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 01/23/2017] [Accepted: 02/24/2017] [Indexed: 06/06/2023]
Abstract
The treatment of effluent containing Bisphenol A (BPA) was investigated experimentally using nitrogen-doped graphene aerogel (NGAs) as particle electrodes in a three-dimensional electrode reactor for the electrochemical treatment was studied. The effects of the cell voltage, pH, the ratio of NGAs mass to solution volume and repeated times on the removal efficiency were investigated. Compared with commercial carbon particle electrodes, the NGAs exhibited stronger activity to remove BPA simulated wastewater. For 15mgL-1 of BPA solution, the degradation rate of BPA exceeded 90% after treatment for only 30min under the optimum conditions. The CODCr removal rate of BPA was 85%. Moreover, in the process of reused 50 times, the degradation rate of BPA can be kept in more than 85%. The CODCr removal rate was stable at about 73%. The intermediate products of electrochemical degradation of BPA were identified by liquid chromatography-mass spectrometry liquid chromatography (LC-MS), and a probable BPA degradation pathway was proposed. It was considered that OH radicals by water electrolysis could constantly attack the aromatic ring to form various intermediates such as hydroxylated-BPA, isopropylphenol, hydroquinone, phenol and butantetraol, maleic acid, oxalic acid. These compounds were eventually mineralized by electrolysis into CO2 and H2O.
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Affiliation(s)
- Zhuang Chen
- Environmental Research Academy, North China Electric Power University, Beijing 102206, China; Labortory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu, 215026, P.R. China
| | - Yimei Zhang
- Environmental Research Academy, North China Electric Power University, Beijing 102206, China; Labortory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu, 215026, P.R. China.
| | - Lincheng Zhou
- Labortory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu, 215026, P.R. China
| | - Hao Zhu
- Labortory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu, 215026, P.R. China
| | - Fei Wan
- Labortory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu, 215026, P.R. China
| | - Yue Wang
- Labortory of Environmental Remediation and Functional Material, Suzhou Research Academy of North China Electric Power University, Suzhou, Jiangsu, 215026, P.R. China
| | - Dandan Zhang
- Environmental Research Academy, North China Electric Power University, Beijing 102206, China
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23
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Banihashemi S, Bagheri H. A core-shell titanium dioxide polyaniline nanocomposite for the needle-trap extraction of volatile organic compounds in urine samples. J Sep Sci 2017; 40:1985-1992. [DOI: 10.1002/jssc.201600970] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 01/17/2017] [Accepted: 02/17/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Solmaz Banihashemi
- Environmental and Bio-Analytical Laboratories; Department of Chemistry; Sharif University of Technology; Tehran Iran
| | - Habib Bagheri
- Environmental and Bio-Analytical Laboratories; Department of Chemistry; Sharif University of Technology; Tehran Iran
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24
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Lin ZQ, Yuan SJ, Li WW, Chen JJ, Sheng GP, Yu HQ. Denitrification in an integrated bioelectro-photocatalytic system. WATER RESEARCH 2017; 109:88-93. [PMID: 27866106 DOI: 10.1016/j.watres.2016.11.042] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 10/15/2016] [Accepted: 11/13/2016] [Indexed: 06/06/2023]
Abstract
Since nitrate causes severe ecological and health risks, nitrate contamination of drinking water sources has become one of the most important water quality concerns all over the world. Photocatalytic reduction of nitrate to molecular nitrogen presents a promising approach to remove nitrate from drinking water sources. However, harmful intermediates like NO2-, NO, NO2 and N2O are usually formed, and metal loading or hole scavengers are generally needed to reduce the recombination of photo-generated electrons and holes, which will cause secondary pollution to drinking water. In this work, an efficient, selective and sustainable bioelectro-photocatalytic nitrate-reducing system by utilizing commercial TiO2 nanoparticles P25 as the photocatalyst and bio-electrons from microbial metabolism as the hole scavenger is reported. In this system, bio-electrons extracted from organic substrates in bioanode are transferred to the photocathode through an external circuit for hole quenching. With the utilization of the residual photogenerated electrons, nitrate is completely reduced to nitrogen without accumulation of harmful nitrite or ammonium. The experimental results and the mechanistic analysis using the first-principles density functional theory calculations demonstrate that toxic by-products like nitrite or ammonium will not be accumulated in this system. Thus, this approach has a great potential for sustainable remediation of nitrate-contaminated drinking water sources.
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Affiliation(s)
- Zhi-Qi Lin
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China
| | - Shi-Jie Yuan
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China
| | - Wen-Wei Li
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China
| | - Jie-Jie Chen
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China.
| | - Guo-Ping Sheng
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China.
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25
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Jasmann JR, Borch T, Sale TC, Blotevogel J. Advanced Electrochemical Oxidation of 1,4-Dioxane via Dark Catalysis by Novel Titanium Dioxide (TiO2) Pellets. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:8817-8826. [PMID: 27420906 DOI: 10.1021/acs.est.6b02183] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
1,4-dioxane is an emerging groundwater contaminant with significant regulatory implications. Because it is resistant to traditional groundwater treatments, remediation of 1,4-dioxane is often limited to costly ex situ UV-based advanced oxidation. By varying applied voltage, electrical conductivity, seepage velocity, and influent contaminant concentration in flow-through reactors, we show that electrochemical oxidation is a viable technology for in situ and ex situ treatment of 1,4-dioxane under a wide range of environmental conditions. Using novel titanium dioxide (TiO2) pellets, we demonstrate for the first time that this prominent catalyst can be activated in the dark even when electrically insulated from the electrodes. TiO2-catalyzed reactors achieved efficiencies of greater than 97% degradation of 1,4-dioxane, up to 4.6 times higher than noncatalyzed electrolytic reactors. However, the greatest catalytic enhancement (70% degradation versus no degradation without catalysis) was observed in low-ionic-strength water, where conventional electrochemical approaches notoriously fail. The TiO2 pellet's dark-catalytic oxidation activity was confirmed on the pharmaceutical lamotrigine and the industrial solvent chlorobenzene, signifying that electrocatalytic treatment has tremendous potential as a transformative remediation technology for persistent organic pollutants in groundwater and other aqueous environments.
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Affiliation(s)
- Jeramy R Jasmann
- Department of Chemistry, ‡Department of Soil and Crop Sciences and §Department of Civil and Environmental Engineering, Colorado State University , Fort Collins, Colorado 80523, United States
| | - Thomas Borch
- Department of Chemistry, ‡Department of Soil and Crop Sciences and §Department of Civil and Environmental Engineering, Colorado State University , Fort Collins, Colorado 80523, United States
| | - Tom C Sale
- Department of Chemistry, ‡Department of Soil and Crop Sciences and §Department of Civil and Environmental Engineering, Colorado State University , Fort Collins, Colorado 80523, United States
| | - Jens Blotevogel
- Department of Chemistry, ‡Department of Soil and Crop Sciences and §Department of Civil and Environmental Engineering, Colorado State University , Fort Collins, Colorado 80523, United States
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26
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Zhang AY, Lin T, He YY, Mou YX. Heterogeneous activation of H2O2 by defect-engineered TiO(2-x) single crystals for refractory pollutants degradation: A Fenton-like mechanism. JOURNAL OF HAZARDOUS MATERIALS 2016; 311:81-90. [PMID: 26954479 DOI: 10.1016/j.jhazmat.2016.02.071] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Revised: 02/26/2016] [Accepted: 02/29/2016] [Indexed: 06/05/2023]
Abstract
The heterogeneous catalyst plays a key role in Fenton-like reaction for advanced oxidation of refractory pollutants in water treatment. Titanium dioxide (TiO2) is a typical semiconductor with high industrial importance due to its earth abundance, low cost and no toxicity. In this work, it is found that TiO2 can heterogeneously activate hydrogen peroxide (H2O2, E°=1.78 eV), a common chemical oxidant, to efficiently generate highly-powerful hydroxyl radical, OH (E(0)=2.80 eV), for advanced water treatment, when its crystal shape, exposed facet and oxygen-stoichiometry are finely tuned. The defect-engineered TiO2 single crystals exposed by high-energy {001} facets exhibited an excellent Fenton-like activity and stability for degrading typical refractory organic pollutants such as methyl orange and p-nitrophenol. Its defect-centered Fenton-like superiority is mainly attributed to the crystal oxygen-vacancy, single-crystalline structure and exposed polar {001} facet. Our findings could provide new chance to utilize TiO2 for Fenton-like technology, and develop novel heterogeneous catalyst for advanced water treatment.
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Affiliation(s)
- Ai-Yong Zhang
- Department of Municipal Engineering, Hefei University of Technology, Hefei 230009, China.
| | - Tan Lin
- Department of Municipal Engineering, Hefei University of Technology, Hefei 230009, China
| | - Yuan-Yi He
- Department of Municipal Engineering, Hefei University of Technology, Hefei 230009, China
| | - Yu-Xuan Mou
- Department of Municipal Engineering, Hefei University of Technology, Hefei 230009, China
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27
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Liu C, Zhang AY, Pei DN, Yu HQ. Efficient Electrochemical Reduction of Nitrobenzene by Defect-Engineered TiO2-x Single Crystals. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:5234-5242. [PMID: 27128346 DOI: 10.1021/acs.est.6b00730] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
TiO2 is a typical semiconductor and has been extensively used as an effective photocatalyst for environmental pollution control. But it could not be used as an electrochemical reductive catalyst because of its low electric conductivity and electrocatalytic activity. In this work, however, we demonstrate that TiO2 can act as an excellent cathodic electrocatalyst when its crystal shape, exposed facet and oxygen-stoichiometry are finely tailored by the local geometric and electronic structures. The defect-engineered TiO2-x single crystals dominantly exposed by high-energy {001} facets exhibits a high cathodic activity and great stability for electrochemical reduction of nitrobenzene, a typical refractory pollutant with high toxicity in environment. The single crystalline structure, the high-energy {001} facet and the defective oxygen vacancy of the defect-engineered TiO2-x single crystals are found to be mainly responsible for their cathodic superiority. With the findings in this work, a more practical non-Pd cathodic electrocatalyst could be prepared and applied for electrocatalytic reduction of refractory pollutants in water and wastewater, and extend the promising applications of TiO2 in the fields of environmental science.
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Affiliation(s)
- Chang Liu
- CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026, China
| | - Ai-Yong Zhang
- CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026, China
- Department of Municipal Engineering, Hefei University of Technology , Hefei, 230009, China
| | - Dan-Ni Pei
- CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026, China
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science and Technology of China , Hefei, 230026, China
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Synthesis and photocatalytic properties of Palladium-loaded three dimensional flower-like anatase TiO2 with dominant {0 0 1} facets. J Colloid Interface Sci 2016; 467:1-9. [DOI: 10.1016/j.jcis.2015.12.053] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 12/28/2015] [Accepted: 12/29/2015] [Indexed: 11/21/2022]
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Wang CY, Zhang X, Song XN, Wang WK, Yu HQ. Novel Bi₁₂O₁₅Cl₆ Photocatalyst for the Degradation of Bisphenol A under Visible-Light Irradiation. ACS APPLIED MATERIALS & INTERFACES 2016; 8:5320-5326. [PMID: 26848924 DOI: 10.1021/acsami.5b12092] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Bisphenol A (BPA), a typical endocrine-disrupting chemical, is widely present in water environments, and its efficient and cost-effective removal is greatly needed. Among various physicochemical methods for BPA degradation, visible-light-driven catalytic degradation of BPA is a promising approach because of its utilization of solar energy. Bismuth oxychloride (BiOCl) is recognized as an efficient photocatalyst, but its band gap, >3.0 eV, makes it inefficient for solar energy utilization, especially for degrading nondye pollutants like BPA. Thus, preparation and application of bismuth oxychloride photocatalysts with an increased visible-light activity are essential. In this work, inspired by density functional theory calculations, a novel bismuth oxychloride photocatalyst, Bi12O15Cl6, was designed. The nanosheets were successfully synthesized using a facile solvothermal method followed by a thermal treatment route. The prepared Bi12O15Cl6 nanosheets had a favorable energy band structure and thus exhibited a superior visible-light photocatalytic activity for degrading BPA. The BPA degradation rate by the Bi12O15Cl6 was determined to be 13.6 and 8.7 times faster than those for BiOCl and TiO2 (P25), respectively. The photogenerated reactive species and degradation intermediates were identified, and the photocatalytic mechanism was elucidated. Furthermore, the as-synthesized Bi12O15Cl6 nanosheets remained stable in the photocatalytic process and could be used repeatedly, demonstrating their promising application in the degradation of diverse pollutants in water and wastewater.
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Affiliation(s)
- Chu-Ya Wang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China , Hefei 230026, China
| | - Xing Zhang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China , Hefei 230026, China
| | - Xiang-Ning Song
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China , Hefei 230026, China
| | - Wei-Kang Wang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China , Hefei 230026, China
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China , Hefei 230026, China
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Pei DN, Gong L, Zhang AY, Zhang X, Chen JJ, Mu Y, Yu HQ. Defective titanium dioxide single crystals exposed by high-energy {001} facets for efficient oxygen reduction. Nat Commun 2015; 6:8696. [PMID: 26493365 PMCID: PMC4846326 DOI: 10.1038/ncomms9696] [Citation(s) in RCA: 116] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 09/21/2015] [Indexed: 12/24/2022] Open
Abstract
The cathodic material plays an essential role in oxygen reduction reaction for energy conversion and storage systems. Titanium dioxide, as a semiconductor material, is usually not recognized as an efficient oxygen reduction electrocatalyst owning to its low conductivity and poor reactivity. Here we demonstrate that nano-structured titanium dioxide, self-doped by oxygen vacancies and selectively exposed with the high-energy {001} facets, exhibits a surprisingly competitive oxygen reduction activity, excellent durability and superior tolerance to methanol. Combining the electrochemical tests with density-functional calculations, we elucidate the defect-centred oxygen reduction reaction mechanism for the superiority of the reductive {001}-TiO2−x nanocrystals. Our findings may provide an opportunity to develop a simple, efficient, cost-effective and promising catalyst for oxygen reduction reaction in energy conversion and storage technologies. Titanium dioxide is not generally considered to be an effective oxygen reduction catalyst. Here, the authors show that nanostructured titanium dioxide, self-doped with oxygen vacancies and with exposed high-energy {001} facets, exhibits competitive oxygen reduction catalytic activity and durability.
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Affiliation(s)
- Dan-Ni Pei
- CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Li Gong
- CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Ai-Yong Zhang
- CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.,Department of Municipal Engineering, Hefei University of Technology, Hefei 230009, China
| | - Xing Zhang
- CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Jie-Jie Chen
- CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Yang Mu
- CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
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Preparation and electrochemical property of TiO2/Nano-graphite composite anode for electro-catalytic degradation of ceftriaxone sodium. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.09.055] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Bai X, Huang X, Zhang Q, Hua Z, Qin C, Qin Q. A carbon needle microelectrode decorated with TiO 2 nanosheets dominated by reactive facets as a highly electrocatalytic sensing element. Talanta 2015; 143:184-190. [DOI: 10.1016/j.talanta.2015.05.069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Revised: 05/22/2015] [Accepted: 05/25/2015] [Indexed: 10/23/2022]
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Sun M, Zhang G, Qin Y, Cao M, Liu Y, Li J, Qu J, Liu H. Redox Conversion of Chromium(VI) and Arsenic(III) with the Intermediates of Chromium(V) and Arsenic(IV) via AuPd/CNTs Electrocatalysis in Acid Aqueous Solution. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:9289-9297. [PMID: 26154110 DOI: 10.1021/acs.est.5b01759] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Simultaneous reduction of Cr(VI) to Cr(III) and oxidation of As(III) to As(V) is a promising pretreatment process for the removal of chromium and arsenic from acid aqueous solution. In this work, the synergistic redox conversion of Cr(VI) and As(III) was efficiently achieved in a three-dimensional electrocatalytic reactor with synthesized AuPd/CNTs particles as electrocatalysts. The AuPd/CNTs facilitated the exposure of active Pd{111} facets and possessed an approximate two-electron-transfer pathway of oxygen reduction with the highly efficient formation of H2O2 as end product, resulting in the electrocatalytic reduction of 97.2 ± 2.4% of Cr(VI) and oxidation of 95.7 ± 4% of As(III). The electrocatalytic reduction of Cr(VI) was significantly accelerated prior to the electrocatalytic oxidation of As(III), and the effectiveness of Cr(VI)/As(III) conversion was favored at increased currents from 20 to 150 mA, decreased initial pH from 7 to 1 and concentrations of Cr(VI) and As(III) ranging from 50 to 1 mg/L. The crucial intermediates of Cr(V) and As(IV) and active free radicals HO(•) and O2(•-) were found for the first time, whose roles in the control of Cr(VI)/As(III) redox conversion were proposed. Finally, the potential applicability of AuPd/CNTs was revealed by their stability in electrocatalytic conversion over 10 cycles.
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Affiliation(s)
- Meng Sun
- †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
| | - Gong 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 100039, China
| | - Yinghua Qin
- †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
| | - Meijuan Cao
- ∥Beijing Engineering Research Center of Printed Electronics, School of Printing and Packaging Engineering, Beijing Institute of Graphic Communication, Beijing 102600, China
| | - Yang Liu
- ‡Department of Chemistry, Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Tsinghua University, Beijing 100084, China
| | - Jinghong Li
- ‡Department of Chemistry, Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Tsinghua University, Beijing 100084, China
| | - Jiuhui Qu
- †Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Huijuan Liu
- †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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Silveira JE, Zazo JA, Pliego G, Bidóia ED, Moraes PB. Electrochemical oxidation of landfill leachate in a flow reactor: optimization using response surface methodology. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:5831-5841. [PMID: 25339535 DOI: 10.1007/s11356-014-3738-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Accepted: 10/16/2014] [Indexed: 06/04/2023]
Abstract
Response surface methodology based on Box-Behnken (BBD) design was successfully applied to the optimization in the operating conditions of the electrochemical oxidation of sanitary landfill leachate aimed for making this method feasible for scale up. Landfill leachate was treated in continuous batch-recirculation system, where a dimensional stable anode (DSA(©)) coated with Ti/TiO2 and RuO2 film oxide were used. The effects of three variables, current density (milliampere per square centimeter), time of treatment (minutes), and supporting electrolyte dosage (moles per liter) upon the total organic carbon removal were evaluated. Optimized conditions were obtained for the highest desirability at 244.11 mA/cm(2), 41.78 min, and 0.07 mol/L of NaCl and 242.84 mA/cm(2), 37.07 min, and 0.07 mol/L of Na2SO4. Under the optimal conditions, 54.99% of chemical oxygen demand (COD) and 71.07 ammonia nitrogen (NH3-N) removal was achieved with NaCl and 45.50 of COD and 62.13 NH3-N with Na2SO4. A new kinetic model predicted obtained from the relation between BBD and the kinetic model was suggested.
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Affiliation(s)
- Jefferson E Silveira
- Department of Environmental Technology, Faculty of Technology, University of Campinas-UNICAMP, R. Paschoal Marmo, 1888, 13484-332, Limeira, SP, Brazil,
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Lu Z, Xiang X, Zou L, Xie J. Fluffy-ball-shaped carbon nanotube–TiO2 nanorod nanocomposites for photocatalytic degradation of methylene blue. RSC Adv 2015. [DOI: 10.1039/c5ra05641a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Fluffy-ball-shaped multiwalled CNT–TiO2 nanorod composites were fabricated via a facile hydrothermal approach for the photocatalytic degradation of methylene blue.
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Affiliation(s)
- Zhisong Lu
- Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies
- Southwest University
- Chongqing 400715
- P. R. China
- Institute for Clean Energy & Advanced Materials
| | - Xiutao Xiang
- Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies
- Southwest University
- Chongqing 400715
- P. R. China
- Institute for Clean Energy & Advanced Materials
| | - Long Zou
- Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies
- Southwest University
- Chongqing 400715
- P. R. China
- Institute for Clean Energy & Advanced Materials
| | - Jiale Xie
- Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies
- Southwest University
- Chongqing 400715
- P. R. China
- Institute for Clean Energy & Advanced Materials
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