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Kumar A, Khan M, He J, Lo IMC. Recent developments and challenges in practical application of visible-light-driven TiO 2-based heterojunctions for PPCP degradation: A critical review. WATER RESEARCH 2020; 170:115356. [PMID: 31816569 DOI: 10.1016/j.watres.2019.115356] [Citation(s) in RCA: 80] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 11/27/2019] [Accepted: 11/29/2019] [Indexed: 06/10/2023]
Abstract
The ability of the TiO2-based photocatalysis process to mineralize organic pollutants has attracted attention worldwide for the degradation of recalcitrant pharmaceuticals and personal care products (PPCPs). Nevertheless, (1) the limited exploitation of the solar spectrum, i.e., activation under UV light (only 2-3% of solar spectrum), and (2) the high recombination rate of photo-generated charge carriers, i.e., electrons and holes, have limited its application which can, however, be improved by developing a TiO2-based heterojunction. The objective of this critical review paper is to discuss the recent developments (2009-2019) in visible-light-driven (VLD) TiO2-based heterojunctions for PPCP degradation and their degradation mechanisms. Compared to the conventional heterojunctions, Schottky and Z-scheme heterojunctions, which are non-conventional heterojunctions, are found to be more effective for PPCP degradation due to their more efficient separation of charge carriers and the occurrence of redox reactions at a relatively higher redox potential. Furthermore, the enhancement strategies for the development of a VLD TiO2-based heterojunction are also explored which can be achieved by selecting the (1) highly photocatalytically active {001} facet of anatase TiO2, (2) synthesis methods governing the structural changes at the junction interface, and (3) heterojunction components which can efficiently generate the powerful •OH radicals. The challenges in practical applications are also discussed which include factors, viz., cost reduction, recycling, stability, byproducts analysis, evaluation of the environmental effectiveness, and reactor design and scale-up of the VLD TiO2-based heterojunctions. Accordingly, the prospects of VLD TiO2-based heterojunctions for PPCP degradation in real environmental applications are discussed.
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Affiliation(s)
- Ashutosh Kumar
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Musharib Khan
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Juhua He
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Irene M C Lo
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China; Institute for Advanced Study, The Hong Kong University of Science and Technology, Hong Kong, China.
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52
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Shevale V, Dhodamani AG, Delekar SD. Catalytic Reclamation of Silver Present in Photographic Waste Using Magnetically Separable TiO 2@CuFe 2O 4 Nanocomposites and Thereof Its Use in Antibacterial Activity. ACS OMEGA 2020; 5:1098-1108. [PMID: 31984266 PMCID: PMC6977080 DOI: 10.1021/acsomega.9b03260] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 11/06/2019] [Indexed: 06/10/2023]
Abstract
In the present investigation, the silver present in photographic waste is reclaimed catalytically using magnetically separable TiO2@CuFe2O4 nanocomposites (NCs), and further, the recovered silver nanoparticles [Ag(0) NPs] are tested against the representative bacteria for the antibacterial activity. Initially, a series of the different composites between TiO2 nanoparticles and CuFe2O4 nanoparticles are synthesized by a sol-gel "ex situ" method to enhance the catalytic activity of bare nanomaterials toward the visible region of the electromagnetic spectrum. X-ray diffraction reveals the presence of characteristic patterns for the tetragonal structure in the bare materials or TiO2@CuFe2O4 NCs; however, the dominance in the phase as well as intensity of the respective XRD reflections in the NCs is observed according to the content of TiO2 or CuFe2O4 in the NCs. Field-emission electron microscopic images show the uniform spherical particles for the representative TiO2@CuFe2O4 NCs, which is also confirmed through the HRTEM images. The magnetically separable behavior of the representative TiO2@CuFe2O4 NCs is confirmed through the VSM measurements, which also shows the superparamagnetic properties due to the S-shaped nature of the hysteresis loop. Thereafter, a photoconversion reaction of Ag(I) ions to Ag(0) NPs as a model reaction is carried out using the different TiO2@CuFe2O4 NCs under visible light irradiation, and hence, the higher catalytic recovery of Ag(0) NPs is observed for a composite containing 10 wt % TiO2 and 90 wt % CuFe2O4 than that of other NCs or the bare one alone. The optimized protocol of the model reaction is adopted for reclaiming Ag(0) NPs from photographic waste. The progress of the catalytic reclamation reaction is monitored using UV-visible, and then sizes of the recovered Ag(0) NPs are confirmed through the HRTEM images. Thereafter, the recovered Ag(0) NPs are tested for complete photoinactivation of Escherichia coli bacteria within 120 min.
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53
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Hu K, E L, Hu C, Zhao D, Zhu M, Wang J, Zhao W. g-C3N4/TiO2 composite microspheres: in situ growth and high visible light catalytic activity. CrystEngComm 2020. [DOI: 10.1039/d0ce01154a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The g-C3N4/TiO2 heterojunction, possessing a 3D flower-like self-assembled morphology, realizing excellent visible-light photocatalytic properties, is a photocatalyst for wastewater treatment or a photoanode for photoelectrochemical water splitting.
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Affiliation(s)
- Kangkai Hu
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
| | - Lei E
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
- Tianjin Key Laboratory of Building Green Functional Materials
| | - Chaoyang Hu
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
| | - Dan Zhao
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
- Tianjin Key Laboratory of Building Green Functional Materials
| | - Mengyao Zhu
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
| | - Jingze Wang
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
| | - Wei Zhao
- School of Materials Science and Engineering
- Tianjin Chengjian University
- Tianjin
- China
- Tianjin Key Laboratory of Building Green Functional Materials
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54
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Guo N, Sun L, Yu H. Enhanced photocatalytic activity of anatase by the rational modification of the {001} facets with Fe( iii) ions. NEW J CHEM 2020. [DOI: 10.1039/c9nj05134a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Fe(iii) ion-modified TiO2 exhibits the highest reaction efficiency for the decomposition of dye molecules and p-chlorophenol due to electron-trapping centers.
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Affiliation(s)
- Na Guo
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 4888 Shengbei Rd
- Changchun
- China
| | - Lei Sun
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 4888 Shengbei Rd
- Changchun
- China
| | - Hongwen Yu
- Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 4888 Shengbei Rd
- Changchun
- China
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55
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Singh S, Prajapat R, Rather RA, Pal B. Aloe-vera flower shaped rutile TiO2 for selective hydrogenation of nitroaromatics under direct sunlight irradiation. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2018.04.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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56
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Qian N, Zhang X, Wang M, Sun X, Sun X, Liu C, Rao R, Ma Y. Great enhancement in photocatalytic performance of (001)-TiO2 through N-doping via the vapor-thermal method. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112127] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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57
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Katal R, Davood Abadi Farahani MH, Jiangyong H. Degradation of acetaminophen in a photocatalytic (batch and continuous system) and photoelectrocatalytic process by application of faceted-TiO2. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.115859] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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58
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Yu J, Søndergaard-Pedersen F, Mamakhel A, Lamagni P, Brummerstedt Iversen B. Three-dimensional morphology of anatase nanocrystals obtained from supercritical flow synthesis with industrial grade TiOSO4 precursor. ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS 2019; 75:1086-1095. [DOI: 10.1107/s2052520619012733] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 09/13/2019] [Indexed: 11/10/2022]
Abstract
Anatase TiO2 (a-TiO2) nanocrystals are vital in catalytic applications both as catalysts (e.g. photodegradation) and as a carrier material (e.g. NOx removal from exhaust). The synthesis of a-TiO2 nanocrystals and their properties have been heavily scrutinized, but there exists a clear gap between the scientific literature, and the scale and price expectation of industrial application. Here it is demonstrated that the industrially most attractive Ti precursor, titanyl sulfate (TiOSO4), can be combined with the green, scalable and fast supercritical flow method to produce phase pure and highly crystalline a-TiO2 nanoparticles with high specific surface area. Control of the nanocrystal morphology is important since it is known that certain facets substantially promote catalytic activity. It is, however, in itself challenging to determine nanocrystal morphology to provide a rational basis for the synthesis control. Here we advocate the use of advanced Rietveld refinement of powder X-ray diffraction data including anisotropic size broadening models in aiding to establish the sample three-dimensional morphology. This relatively quick and robust method assists in overcoming the often encountered ambiguity inherent in two-dimensional to three-dimensional reconstruction of selected particle morphologies with transmission electron microscopy and tomography techniques.
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59
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Yang L, Zhou Z, Song J, Chen X. Anisotropic nanomaterials for shape-dependent physicochemical and biomedical applications. Chem Soc Rev 2019; 48:5140-5176. [PMID: 31464313 PMCID: PMC6768714 DOI: 10.1039/c9cs00011a] [Citation(s) in RCA: 105] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This review contributes towards a systematic understanding of the mechanism of shape-dependent effects on nanoparticles (NPs) for elaborating and predicting their properties and applications based on the past two decades of research. Recently, the significance of shape-dependent physical chemistry and biomedicine has drawn ever increasing attention. While there has been a great deal of effort to utilize NPs with different morphologies in these fields, so far research studies are largely localized in particular materials, synthetic methods, or biomedical applications, and have ignored the interactional and interdependent relationships of these areas. This review is a comprehensive description of the NP shapes from theory, synthesis, property to application. We figure out the roles that shape plays in the properties of different kinds of nanomaterials together with physicochemical and biomedical applications. Through systematic elaboration of these shape-dependent impacts, better utilization of nanomaterials with diverse morphologies would be realized and definite strategies would be expected for breakthroughs in these fields. In addition, we have proposed some critical challenges and open problems that need to be addressed in nanotechnology.
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Affiliation(s)
- Lijiao Yang
- MOE Key Laboratory for Analytical Science of Food Safety and Biology, College of Chemistry, Fuzhou University, Fuzhou 350108, P. R. China. and Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, USA.
| | - Zijian Zhou
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, USA.
| | - Jibin Song
- MOE Key Laboratory for Analytical Science of Food Safety and Biology, College of Chemistry, Fuzhou University, Fuzhou 350108, P. R. China.
| | - Xiaoyuan Chen
- Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD 20892, USA.
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60
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Yang Y, Wang ZY, Zhang F, Fan Y, Dong JJ, Sun S, Gao C, Bao J. Surface modification of (001) facets dominated TiO2 with ozone for adsorption and photocatalytic degradation of gaseous toluene. CHINESE J CHEM PHYS 2019. [DOI: 10.1063/1674-0068/cjcp1903062] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Yue Yang
- National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230029, China
| | - Zhi-yu Wang
- National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230029, China
| | - Fan Zhang
- Beijing Advanced Innovation Center for Big Data and Brain Computing, Beihang University, Beijing 100191, China
| | - Yi Fan
- National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230029, China
| | - Jing-jing Dong
- National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230029, China
| | - Song Sun
- School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China
| | - Chen Gao
- National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230029, China
- Beijing Advanced Sciences and Innovation center, Chinese Academy of Sciences, Beijing 101407, China
| | - Jun Bao
- National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230029, China
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61
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Carey JJ, McKenna KP. Screening Doping Strategies To Mitigate Electron Trapping at Anatase TiO 2 Surfaces. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2019; 123:22358-22367. [PMID: 32064016 PMCID: PMC7011776 DOI: 10.1021/acs.jpcc.9b05840] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 07/29/2019] [Indexed: 05/21/2023]
Abstract
Nanocrystalline anatase titanium dioxide is an efficient electron transport material for solar cells and photocatalysts. However, low-coordinated Ti cations at surfaces introduce low-lying Ti 3d states that can trap electrons, reducing charge mobility. Here, a number of dopants (V, Sb, Sn, Zr, and Hf) are examined to replace these low-coordinated Ti cations and reduce electron trapping in anatase crystals. V, Sb, and Sn dopants act as electron traps, while Zr and Hf dopants are found to prevent electron trapping. We also show that alkali metal dopants can be used to fill surface traps by donating electrons into the 3d states of low-coordinated Ti ions. These results provide practical guidance on the optimization of charge mobility in nanocrystalline TiO2 by doping.
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62
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Jo YK, Lee JM, Son S, Hwang SJ. 2D inorganic nanosheet-based hybrid photocatalysts: Design, applications, and perspectives. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2019. [DOI: 10.1016/j.jphotochemrev.2018.03.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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63
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Xiao M, Wang Z, Lyu M, Luo B, Wang S, Liu G, Cheng HM, Wang L. Hollow Nanostructures for Photocatalysis: Advantages and Challenges. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1801369. [PMID: 30125390 DOI: 10.1002/adma.201801369] [Citation(s) in RCA: 223] [Impact Index Per Article: 44.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 04/05/2018] [Indexed: 05/25/2023]
Abstract
Photocatalysis for solar-driven reactions promises a bright future in addressing energy and environmental challenges. The performance of photocatalysis is highly dependent on the design of photocatalysts, which can be rationally tailored to achieve efficient light harvesting, promoted charge separation and transport, and accelerated surface reactions. Due to its unique feature, semiconductors with hollow structure offer many advantages in photocatalyst design including improved light scattering and harvesting, reduced distance for charge migration and directed charge separation, and abundant surface reactive sites of the shells. Herein, the relationship between hollow nanostructures and their photocatalytic performance are discussed. The advantages of hollow nanostructures are summarized as: 1) enhancement in the light harvesting through light scattering and slow photon effects; 2) suppression of charge recombination by reducing charge transfer distance and directing separation of charge carriers; and 3) acceleration of the surface reactions by increasing accessible surface areas for separating the redox reactions spatially. Toward the end of the review, some insights into the key challenges and perspectives of hollow structured photocatalysts are also discussed, with a good hope to shed light on further promoting the rapid progress of this dynamic research field.
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Affiliation(s)
- Mu Xiao
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Zhiliang Wang
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Miaoqiang Lyu
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Bin Luo
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Songcan Wang
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Gang Liu
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China
- School of Materials Science and Engineering, University of Science and Technology of China, 72 Wenhua Road, Shenyang, 110016, China
| | - Hui-Ming Cheng
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China
| | - Lianzhou Wang
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
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64
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Siliveri S, Chirra S, Tyagi C, Gandamalla A, Adepu AK, Goskula S, Gujjula SR, Venkatathri N. New Porous High Surface Area, TiO
2
Anatase/SAPO‐35 Mild Brønsted Acidic Nanocomposite: Synthesis, Characterization and Studies on it's Enhanced Photocatalytic Activity. ChemistrySelect 2019. [DOI: 10.1002/slct.201902134] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Suresh Siliveri
- Department of ChemistryNational Institute of Technology, Warangal Telangana 506 004 India
| | - Suman Chirra
- Department of ChemistryNational Institute of Technology, Warangal Telangana 506 004 India
| | - Chinkit Tyagi
- Department of ChemistryNational Institute of Technology, Warangal Telangana 506 004 India
- National Chemical LaboratoryCatalysis Division Pune, Maharashtra 411 008 India
| | - Ambedkar Gandamalla
- Department of ChemistryNational Institute of Technology, Warangal Telangana 506 004 India
| | - Ajay Kumar Adepu
- Department of ChemistryNational Institute of Technology, Warangal Telangana 506 004 India
- Indian Institute of Chemical TechnologyCatalysis Division, Hyderabad Telangana 500 007 India
| | - Srinath Goskula
- Department of ChemistryNational Institute of Technology, Warangal Telangana 506 004 India
| | - Sripal Reddy Gujjula
- Department of ChemistryNational Institute of Technology, Warangal Telangana 506 004 India
| | - Narayanan Venkatathri
- Department of ChemistryNational Institute of Technology, Warangal Telangana 506 004 India
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65
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Wei T, Zhu YN, An X, Liu LM, Cao X, Liu H, Qu J. Defect Modulation of Z-Scheme TiO2/Cu2O Photocatalysts for Durable Water Splitting. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01786] [Citation(s) in RCA: 102] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tingcha Wei
- Beijing Computational Science Research Center, Beijing 100193, China
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Ya-Nan Zhu
- Beijing Computational Science Research Center, Beijing 100193, China
| | - Xiaoqiang An
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Li-Min Liu
- Beijing Computational Science Research Center, Beijing 100193, China
- School of Physics, Beihang University, Beijing 100191, China
| | - Xingzhong Cao
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Huijuan Liu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Jiuhui Qu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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66
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Meng A, Zhang L, Cheng B, Yu J. Dual Cocatalysts in TiO 2 Photocatalysis. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1807660. [PMID: 31148244 DOI: 10.1002/adma.201807660] [Citation(s) in RCA: 277] [Impact Index Per Article: 55.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 03/17/2019] [Indexed: 05/22/2023]
Abstract
Semiconductor photocatalysis is recognized as a promising strategy to simultaneously address energy needs and environmental pollution. Titanium dioxide (TiO2 ) has been investigated for such applications due to its low cost, nontoxicity, and high chemical stability. However, pristine TiO2 still suffers from low utilization of visible light and high photogenerated-charge-carrier recombination rate. Recently, TiO2 photocatalysts modified by dual cocatalysts with different functions have attracted much attention due to the extended light absorption, enhanced reactant adsorption, and promoted charge-carrier-separation efficiency granted by various cocatalysts. Recent progress on the component and structural design of dual cocatalysts in TiO2 photocatalysts is summarized. Depending on their components, dual cocatalysts decorated on TiO2 photocatalysts can be divided into the following categories: bimetallic cocatalysts, metal-metal oxide/sulfide cocatalysts, metal-graphene cocatalysts, and metal oxide/sulfide-graphene cocatalysts. Depending on their architecture, they can be categorized into randomly deposited binary cocatalysts, facet-dependent selective-deposition binary cocatalysts, and core-shell structural binary cocatalysts. Concluding perspectives on the challenges and opportunities for the further exploration of dual cocatalyst-modified TiO2 photocatalysts are presented.
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Affiliation(s)
- Aiyun Meng
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Liuyang Zhang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Bei Cheng
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Jiaguo Yu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
- Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
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67
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Wei Z, Fang Y, Wang Z, Liu Y, Wu Y, Liang K, Yan J, Pan Z, Hu G. pH effects of the arsenite photocatalytic oxidation reaction on different anatase TiO 2 facets. CHEMOSPHERE 2019; 225:434-442. [PMID: 30889407 DOI: 10.1016/j.chemosphere.2019.03.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 02/26/2019] [Accepted: 03/04/2019] [Indexed: 06/09/2023]
Abstract
TiO2 is one of the most cheap materials which can both adsorb arsenic and oxidize arsenite [As(III)] to arsenate [As(V)]. In this study, anatase TiO2 crystals with different main facets such as {101}, {001} and {100} are synthesized and used to investigate arsenic adsorption kinetics, adsorption isotherms, photocatalytic oxidation (PCO) process and the pH effects. The adsorption kinetics of arsenic on TiO2 crystals can be described by the pseudo second-order kinetic model. For the adsorption isotherms, the Langmuir model is better than the Freundlich model for arsenic on these TiO2 crystals. For the PCO process, the rate of As(III) oxidation can be denoted by the pseudo first-order kinetic model. It should be noted that at neutral condition the adsorption and PCO rates of the three kinds of TiO2 crystals follow the order of {101} > {001} > {100}. The pH effect is above all important for both the arsenic adsorption and its PCO. The highest PCO speed appears at high pH values such as at pH 11 or 12.
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Affiliation(s)
- Zhigang Wei
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China.
| | - Yangfei Fang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Zhenrui Wang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Yue Liu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Yang Wu
- College of Chemistry, Liaoning University, Shenyang 110036, PR China
| | - Kai Liang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Jiahong Yan
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Zhanchang Pan
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Guanghui Hu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, PR China
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68
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Effect of Surface Chemistry and Crystallographic Parameters of TiO2 Anatase Nanocrystals on Photocatalytic Degradation of Bisphenol A. Catalysts 2019. [DOI: 10.3390/catal9050447] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The photocatalytic activity of a series of anatase TiO2 materials with different amounts of exposed (001) facets (i.e., 12% (TiO2-1), 38% (TiO2-3), and 63% (TiO2-3)) was tested in a batch slurry reactor towards liquid-phase bisphenol A (BPA, c0(BPA) = 10 mg/L, ccat. = 125 mg/L) degradation. Photo-electrochemical and photo-luminescence measurements revealed that with the increasing amount of exposed anatase (001) facets, the catalysts generate more electron-hole pairs and OH∙ radicals that participate in the photocatalytic mineralization of pollutants dissolved in water. In the initial stages of BPA degradation, a correlation between % exposure of (001) facets and catalytic activity was developed, which was in good agreement with the findings of the photo-electrochemical and photo-luminescence measurements. TiO2-1 and TiO2-3 solids achieved 100% BPA removal after 80 min in comparison to the TiO2-2 sample. Adsorption of BPA degradation products onto the TiO2-2 catalyst surface was found to have a detrimental effect on the photocatalytic performance in the last stage of the reaction course. Consequently, the global extent of BPA mineralization decreased with the increasing exposure of anatase (001) facets. The major contribution to the enhanced reactivity of TiO2 anatase (001) surface is the Brønsted acidity resulting from dissociative chemisorption of water on a surface as indicated by FTIR, TPD, and MAS NMR analyses.
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69
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Zhu Y, Zhang Z, Lu N, Hua R, Dong B. Prolonging charge-separation states by doping lanthanide-ions into {001}/{101} facets-coexposed TiO2 nanosheets for enhancing photocatalytic H2 evolution. CHINESE JOURNAL OF CATALYSIS 2019. [DOI: 10.1016/s1872-2067(18)63182-1] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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70
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Wang JZ, Zhou JP, Wang Y, Miao NX, Guo ZQ, Lei YX. The surface reactivity and structural properties of anatase TiO2 (001), (100), (101) and (105) surface researched with DFT. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES 2019. [DOI: 10.1007/s40010-017-0466-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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71
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Mamaghani AH, Haghighat F, Lee CS. Hydrothermal/solvothermal synthesis and treatment of TiO 2 for photocatalytic degradation of air pollutants: Preparation, characterization, properties, and performance. CHEMOSPHERE 2019; 219:804-825. [PMID: 30572234 DOI: 10.1016/j.chemosphere.2018.12.029] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 10/26/2018] [Accepted: 12/05/2018] [Indexed: 06/09/2023]
Abstract
Photocatalytic oxidation (PCO) is a well-known technology for air purification and has been extensively studied for removal of many air pollutants. Titanium dioxide (TiO2) is the most investigated photocatalyst in the field of environmental remediation owed to its chemical stability, non-toxicity, and suitable positions of valence and conduction bands. Various preparation techniques including sol-gel, flame hydrolysis, water-in-oil microemulsion, chemical vapour deposition, solvothermal, and hydrothermal have been employed to obtain TiO2 materials. Hydro-/Solvothermal (HST) synthesis, focus of the present work, can be defined as a preparation method in which crystal growth occurs in a solvent at relatively low temperature (<200 °C) and above atmospheric pressure. This paper aims to provide a comprehensive and critical review of current knowledge regarding the application of HST synthesis for fabrication of TiO2 nanostructures for indoor air purification. TiO2 nanostructures are categorized from the morphological standpoint (e.g. nanoparticles, nanotubes, nanosheets, and hierarchically porous) and discussed in detail. The influence of preparation parameters including hydrothermal time, temperature, pH of the reaction medium, solvent, and calcination temperature on physical, chemical, and optical properties of TiO2 is reviewed. Considering the complex interplay among catalyst properties, a special emphasis is placed on elucidating the interconnection between various photocatalyst features and their impacts on photocatalytic activity.
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Affiliation(s)
| | - Fariborz Haghighat
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, Canada.
| | - Chang-Seo Lee
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, Canada.
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72
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Lim PF, Leong KH, Sim LC, Abd Aziz A, Saravanan P. Amalgamation of N-graphene quantum dots with nanocubic like TiO 2: an insight study of sunlight sensitive photocatalysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:3455-3464. [PMID: 30515688 DOI: 10.1007/s11356-018-3821-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 11/21/2018] [Indexed: 06/09/2023]
Abstract
In this work, a sunlight-sensitive photocatalyst of nanocubic-like titanium dioxide (TiO2) and N-doped graphene quantum dots (N-GQDs) is developed through a simple hydrothermal and physical mixing method. The successful amalgamation composite photocatalyst characteristics were comprehensively scrutinized through various physical and chemical analyses. A complete removal of bisphenol A (BPA) is attained by a synthesized composite after 30 min of sunlight irradiation as compared to pure TiO2. This clearly proved the unique contribution of N-GQDs that enhanced the ability of light harvesting especially under visible light and near-infrared region. This superior characteristic enables it to maximize the absorbance in the entire solar spectrum. However, the increase of N-GQDs weight percentage has created massive oxygen vacancies that suppress the generation of active radicals. This resulted in a longer duration for a complete removal of BPA as compared to lower weight percentage of N-GQDs. Hence, this finding can offer a new insight in developing effective sunlight-sensitive photocatalysts for various complex organic pollutants degradation.
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Affiliation(s)
- Ping Feng Lim
- Department of Environmental Engineering, Faculty of Engineering and Green Technology, Universiti Tunku Abdul Rahman, 31900, Kampar, Perak, Malaysia
| | - Kah Hon Leong
- Department of Environmental Engineering, Faculty of Engineering and Green Technology, Universiti Tunku Abdul Rahman, 31900, Kampar, Perak, Malaysia.
| | - Lan Ching Sim
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, Jalan Sungai Long 9, Bandar Sungai Long, 43000, Kajang, Selangor, Malaysia
| | - Azrina Abd Aziz
- Department of Energy and Environment, Faculty of Engineering Technology, Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300 Gambang, Kuantan, Pahang, Malaysia
| | - Pichiah Saravanan
- Environmental Nanotechnology Laboratory, Department of Environmental Science and Engineering, Indian Institute of Technology (ISM), Dhanbad, Jharkhand, 826004, India
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73
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Li Y, Ye X, Cao S, Yang C, Wang Y, Ye J. Oxygen-Deficient Dumbbell-Shaped Anatase TiO 2-x Mesocrystals with Nearly 100 % Exposed {101} Facets: Synthesis, Growth Mechanism, and Photocatalytic Performance. Chemistry 2019; 25:3032-3041. [PMID: 30602067 DOI: 10.1002/chem.201805356] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Indexed: 11/09/2022]
Abstract
The development of hierarchical TiO2 superstructures with new morphologies and intriguing photoelectric properties for utilizing solar energy is known to be an effective approach to alleviate the serious problems of environmental pollution. Herein, unique oxygen-deficient dumbbell-shaped anatase TiO2-x mesocrystals (DTMCs) enclosed by nearly 100 % {101} facets were readily synthesized by mesoscale transformation in TiCl3 /acetic acid (HAc) mixed solution, followed by calcination under vacuum. These mesocrystals exhibited much higher photoreactivity toward removing the model pollutants methyl orange and CrVI than truncated tetragonal bipyramidal anatase nanocrystals (TNCs), anatase mesocrystals built from truncated tetragonal bipyramidal anatase nanocrystals (TTMCs), and anatase mesocrystals constructed by anatase nanocrystals with nearly 100 % exposed {101} facets (TMCs), revealing that both the oxidation and reduction abilities of anatase TiO2 were simultaneously enhanced upon fabricating an oxygen-deficient mesocrystalline architecture with about 100 % exposed {101} facets. Further characterization illustrated that such an enhancement of photoreactivity was mainly due to the strengthened light absorption, boosted charge carrier separation, and nearly 100 % exposed {101} facets of the oxygen-deficient dumbbell-shaped anatase mesocrystals. This work will be useful for guiding the synthesis of oxygen-deficient ordered superstructures of metal oxides with desired morphologies and exposed facets for promising applications in environmental remediation.
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Affiliation(s)
- Yongjun Li
- Department of Chemistry, College of Science, Huazhong Agricultural University, No. 1 Shizishan Street, Wuhan, 430070, P. R. China
| | - Xiaozhou Ye
- Department of Chemistry, College of Science, Huazhong Agricultural University, No. 1 Shizishan Street, Wuhan, 430070, P. R. China
| | - Shengxin Cao
- Department of Chemistry, College of Science, Huazhong Agricultural University, No. 1 Shizishan Street, Wuhan, 430070, P. R. China
| | - Chujing Yang
- Department of Chemistry, College of Science, Huazhong Agricultural University, No. 1 Shizishan Street, Wuhan, 430070, P. R. China
| | - Yun Wang
- Department of Chemistry, College of Science, Huazhong Agricultural University, No. 1 Shizishan Street, Wuhan, 430070, P. R. China
| | - Jianfeng Ye
- Department of Chemistry, College of Science, Huazhong Agricultural University, No. 1 Shizishan Street, Wuhan, 430070, P. R. China
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74
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Mulcahy JR, He S, Jin DS, Guo W, Arteta S, Cliff JB, Zhu Z, Wei WD. Experimental Insights into the Growth of Single Truncated Anatase Bipyramids. Chemistry 2019; 25:993-996. [PMID: 30462865 DOI: 10.1002/chem.201805773] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Indexed: 11/06/2022]
Abstract
Fluorine has been recognized to selectively stabilize anatase titanium dioxide (TiO2 ) crystal facets; however, resolving its physical location at the nanometer scale remains empirically elusive. Here, we provide direct experimental evidence to reveal the spatial distribution of fluorine on single truncated anatase bipyramids (TABs) using nanoscale secondary ion mass spectrometry (NanoSIMS). Fluorine was found to preferentially adsorb on the (001) facet compared to the (101) facet of TABs. Moreover, NanoSIMS depth profiling exhibited a significantly different fluorine distribution between these two facets in the near-surface region, illustrating the essential role of lattice-doped fluorine in the anisotropic crystal growth of TABs.
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Affiliation(s)
- Justin R Mulcahy
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - Shuai He
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - Decarle S Jin
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - Wenxiao Guo
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - Sarah Arteta
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - John B Cliff
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington, 99354, USA
| | - Zihua Zhu
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington, 99354, USA
| | - Wei David Wei
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
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75
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Polyurethane-Supported Graphene Oxide Foam Functionalized with Carbon Dots and TiO2 Particles for Photocatalytic Degradation of Dyes. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9020293] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The design and optimal synthesis of functional nanomaterials can meet the requirements of energy and environmental science. As a typical photocatalyst, TiO2 can be used to degrade dyes into non-toxic substances. In this work, we demonstrated the in-situ hydrothermal synthesis of carbon quantum dots (CQDs)-modified TiO2 (CQDs/TiO2) particles, and the subsequent fabrication of three-dimensional (3D) graphene oxide (GO) foam doped with CQDs/TiO2 via a facile strategy. By making full use of the up-conversion characteristics of CQDs, the synthesized CQDs/TiO2 exhibited high catalytic activity under visible light. In order to recover the photocatalyst conveniently, CQDs/TiO2 and GO were mixed by ultrasound and loaded on 3D polyurethane foam (PUF) by the multiple impregnation method. It was found that GO, CQDs/TiO2, and PUF reveal synergistic effects on the dye adsorption and photocatalytic degradation processes. The fabricated 3D CQDs/TiO2/GO foam system with a stable structure can maintain a high photocatalytic degradation efficiency after using at least five times. It is expected that the fabricated 3D materials will have potential applications in the fields of oil water separation, the removal of oils, and the photothermal desalination of seawater.
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76
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Wei T, Zhu Y, Wu Y, An X, Liu LM. Effect of Single-Atom Cocatalysts on the Activity of Faceted TiO 2 Photocatalysts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:391-397. [PMID: 30580513 DOI: 10.1021/acs.langmuir.8b03488] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The synergetic contribution of crystal facets and atomic cocatalysts toward the photoactivity of TiO2 was fundamentally investigated. Atomic-level dispersed Pt and Au were deposited onto 001-faceted and 101-faceted TiO2, separately. When used as photocatalysts for photocatalytic H2 production, Pt/TiO2-001 showed 1156 and 3 times higher H2 evolution rate than that of cocatalyst-free TiO2-001 and Pt-cocatalyzed TiO2-101. The significantly improved photocatalytic performance was attributed to the efficient separation of high-energy electrons and the sufficient exposure of reactive sites. This study demonstrates a promising way to design single-atom-assisted photocatalysts for high-efficiency water splitting.
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Affiliation(s)
- Tingcha Wei
- Beijing Computational Science Research Center , Beijing 100193 , China
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Yanan Zhu
- Beijing Computational Science Research Center , Beijing 100193 , China
| | - Yuxuan Wu
- Beijing Computational Science Research Center , Beijing 100193 , China
| | - Xiaoqiang An
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment , Tsinghua University , Beijing 100084 , China
| | - Li-Min Liu
- School of Physics , Beihang University , Beijing 100191 , China
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77
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Huang KY, Luo YH, Cheng HM, Tang J, Huang JH. Performance Enhancement of CdS/CdSe Quantum Dot-Sensitized Solar Cells with (001)-Oriented Anatase TiO 2 Nanosheets Photoanode. NANOSCALE RESEARCH LETTERS 2019; 14:18. [PMID: 30635791 PMCID: PMC6329687 DOI: 10.1186/s11671-018-2842-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 12/18/2018] [Indexed: 06/09/2023]
Abstract
CdS/CdSe quantum dot-sensitized solar cells (QDSSCs) were fabricated on two types of TiO2 photoanodes, namely nanosheets (NSs) and nanoparticles. The TiO2 NSs with high (001)-exposed facets were prepared via a hydrothermal method, while the TiO2 nanoparticles used the commercial Degussa P-25. It was found that the pore size, specific surface area, porosity, and electron transport properties of TiO2 NSs were generally superior to those of P-25. As a result, the TiO2 NS-based CdS/CdSe QDSSC has exhibited a power conversion efficiency of 4.42%, which corresponds to a 54% improvement in comparison with the P-25-based reference cell. This study provides an effective photoanode design using nanostructure approach to improve the performance of TiO2-based QDSSCs.
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Affiliation(s)
- Kuo-Yen Huang
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 300 Taiwan
| | - Yi-Hsiang Luo
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 300 Taiwan
| | - Hsin-Ming Cheng
- Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei, 115 Taiwan
| | - Jau Tang
- Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei, 115 Taiwan
| | - Jin-Hua Huang
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, 300 Taiwan
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78
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Adepu AK, Goskula S, Chirra S, Siliveri S, Gujjula SR, Narayanan V. Synthesis of a high-surface area V2O5/TiO2–SiO2 catalyst and its application in the visible light photocatalytic degradation of methylene blue. RSC Adv 2019; 9:24368-24376. [PMID: 35527892 PMCID: PMC9069717 DOI: 10.1039/c9ra03866c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 07/21/2019] [Indexed: 11/21/2022] Open
Abstract
In the present study, we synthesized several high-surface area V2O5/TiO2–SiO2 catalysts (vanado titanium silicate, VTS). The synthesized materials are characterized by PXRD, FE-SEM/EDAX, TEM, BET-surface area, FT-IR, UV-Vis, XPS, fluorescence and photocatalytic studies.
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Affiliation(s)
- Ajay Kumar Adepu
- Department of Chemistry
- National Institute of Technology
- Warangal 506 004
- India
| | - Srinath Goskula
- Department of Chemistry
- National Institute of Technology
- Warangal 506 004
- India
| | - Suman Chirra
- Department of Chemistry
- National Institute of Technology
- Warangal 506 004
- India
| | - Suresh Siliveri
- Department of Chemistry
- National Institute of Technology
- Warangal 506 004
- India
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79
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Gao Y, Zheng Y, Chai J, Tian J, Jing T, Zhang D, Cheng J, Peng H, Liu B, Zheng G. Highly effective photocatalytic performance of {001}-TiO2/MoS2/RGO hybrid heterostructures for the reduction of Rh B. RSC Adv 2019; 9:15033-15041. [PMID: 35516304 PMCID: PMC9064259 DOI: 10.1039/c9ra02634g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 05/08/2019] [Indexed: 11/21/2022] Open
Abstract
Effective separation and rapid transfer of photogenerated electron–hole pairs are key features of photocatalytic materials with high catalytic activity, which could be achieved by co-catalysts.
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Affiliation(s)
- Ya Gao
- School of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Yongjie Zheng
- School of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Jixing Chai
- School of Materials Science and Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Jingzhi Tian
- School of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Tao Jing
- School of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Deqing Zhang
- School of Materials Science and Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Junye Cheng
- Center of Super-Diamond and Advanced Films (COSDAF)
- Department of Materials Science and Engineering
- City University of Hong Kong
- China
| | - Huiqing Peng
- Center of Super-Diamond and Advanced Films (COSDAF)
- Department of Materials Science and Engineering
- City University of Hong Kong
- China
| | - Bin Liu
- Center of Super-Diamond and Advanced Films (COSDAF)
- Department of Materials Science and Engineering
- City University of Hong Kong
- China
| | - Guangping Zheng
- Department of Mechanical Engineering
- The Hong Kong Polytechnic University
- Kowloon
- China
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80
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Qiu J, Liu F, Yue C, Ling C, Li A. A recyclable nanosheet of Mo/N-doped TiO 2 nanorods decorated on carbon nanofibers for organic pollutants degradation under simulated sunlight irradiation. CHEMOSPHERE 2019; 215:280-293. [PMID: 30321808 DOI: 10.1016/j.chemosphere.2018.09.182] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 09/19/2018] [Accepted: 09/30/2018] [Indexed: 05/25/2023]
Abstract
A novel nanosheet of Mo/N-codoped TiO2 nanorods immobilized on carbon nanofibers (MNTC nanosheet) was self-synthesized through two facile steps. The Mo/N-doped TiO2 nanorods dispersed through in situ growth on the network constructed by long and vertical carbon nanofibers (CNFs). The fabricated MNTC nanosheet displayed superb photocatalytic activity of methylene blue (MB), and the degradation ratio by the MNTC nanosheet was nearly twice than that of pure nanoparticles. The photocatalytic activities during the degradation process in the presence of environmental media such as inorganic salts and natural organic matter (NOM) were also determined. Intermediates were analyzed by ion chromatography and electrospray ionization-mass spectrometry to unravel the potential degradation pathways, and the excellent mineralization ratio for MB over MNTC nanosheet was 79.8%. The trapping active species experiments verified that h+ was the main active species in the degradation process. Notably, the recycling experiment proved that the MNTC nanosheet was more stable, and it was successfully applied in purifying practical wastewater. Lastly, the fabricated MNTC nanosheet also displayed remarkable degradation performance towards sulfamethoxazole and bisphenol A.
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Affiliation(s)
- Jinli Qiu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Fuqiang Liu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China; State Environmental Protection Engineering Center for Organic Chemical Industrial Waste Water Disposal Resource Reuse, Nanjing 210023, PR China.
| | - Cailiang Yue
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Chen Ling
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Aimin Li
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China; State Environmental Protection Engineering Center for Organic Chemical Industrial Waste Water Disposal Resource Reuse, Nanjing 210023, PR China
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81
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Sahoo RK, Das A, Samantaray K, Singh SK, Mane RS, Shin HC, Yun JM, Kim KH. Electrochemical glucose sensing characteristics of two-dimensional faceted and non-faceted CuO nanoribbons. CrystEngComm 2019. [DOI: 10.1039/c8ce02033g] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present faceted and non-faceted crystal cupric oxide (CuO) nanoribbons synthesized by different processes for glucose-sensing applications.
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Affiliation(s)
- Rakesh K. Sahoo
- Global Frontier R&D Center for Hybrid Interface Materials
- Pusan National University
- Busan 609-735
- Republic of Korea
| | - Arya Das
- CSIR-Institute of Minerals and Materials Technology
- Bhubaneswar-751013
- India
| | - Koyel Samantaray
- Department of Physics
- National Institute of Technology
- Rourkela
- India
| | - Saroj K. Singh
- CSIR-Institute of Minerals and Materials Technology
- Bhubaneswar-751013
- India
| | - Rajaram S. Mane
- Department of Materials Science and Engineering
- Pusan National University
- Busan 609-735
- Republic of Korea
| | - Heon-Cheol Shin
- Department of Materials Science and Engineering
- Pusan National University
- Busan 609-735
- Republic of Korea
| | - Je Moon Yun
- Global Frontier R&D Center for Hybrid Interface Materials
- Pusan National University
- Busan 609-735
- Republic of Korea
| | - Kwang Ho Kim
- Global Frontier R&D Center for Hybrid Interface Materials
- Pusan National University
- Busan 609-735
- Republic of Korea
- Department of Materials Science and Engineering
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82
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Wang J, He B, Wei X, Li P, Liang J, Qiang S, Fan Q, Wu W. Sorption of uranyl ions on TiO 2: Effects of pH, contact time, ionic strength, temperature and HA. J Environ Sci (China) 2019; 75:115-123. [PMID: 30473276 DOI: 10.1016/j.jes.2018.03.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 03/09/2018] [Accepted: 03/12/2018] [Indexed: 06/09/2023]
Abstract
Sorption of U(VI) onto TiO2 as functions of pH, ionic strength, contact time, soil humic acid (SHA), solid-to-liquid ratio and temperature was studied under ambient conditions using batch and spectroscopic approaches. The sorption of U(VI) on TiO2 was significantly dependent on pH and ionic strength. The presence of SHA slightly enhanced the sorption of U(VI) on TiO2 below pH4.0, while it inhibited U(VI) sorption in the higher pH range. U(VI) sorption on TiO2 was favored at high temperatures, and the sorption process was estimated to be endothermic and spontaneous. Reduction of U(VI) to lower valent species was confirmed by X-ray photo-electron spectroscopy analysis. It is very interesting to find that U(VI) sorption on TiO2 was promoted in solutions with higher back-ground electrolyte concentrations. In the presence of U(VI), higher back-ground electrolyte made more TiO2 particles aggregate through (001) facets, leading more (101) facets to be exposed. Therefore, the reduction of U(VI) was enhanced by the exposed (101) facets and more U(VI) removal was observed.
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Affiliation(s)
- Jingjing Wang
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China.
| | - Bihong He
- Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Xiaoyan Wei
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Ping Li
- Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China.
| | - Jianjun Liang
- Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Shirong Qiang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Qiaohui Fan
- Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Wangsuo Wu
- Radiochemistry Laboratory, School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China.
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83
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Rimoldi L, Meroni D, Pargoletti E, Biraghi I, Cappelletti G, Ardizzone S. Role of the growth step on the structural, optical and surface features of TiO 2/SnO 2 composites. ROYAL SOCIETY OPEN SCIENCE 2019; 6:181662. [PMID: 30800395 PMCID: PMC6366208 DOI: 10.1098/rsos.181662] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Accepted: 12/03/2018] [Indexed: 06/09/2023]
Abstract
TiO2/SnO2 composites have attracted considerable attention for their application in photocatalysis, fuel cells and sensors. Structural, morphological, optical and surface features play a pivotal role in photoelectrochemical applications and are critically related to the synthetic route. Most of the reported synthetic procedures require high-temperature treatments in order to tailor the sample crystallinity, usually at the expense of surface hydroxylation and morphology. In this work, we investigate the role of a treatment in an autoclave at a low temperature (100°C) on the sample properties and photocatalytic performance. With respect to samples calcined at 400°C, the milder crystallization treatment promotes anatase phase, mesoporosity and water chemi/physisorption, while reducing the incorporation of heteroatoms within the TiO2 lattice. The role of Sn content was also investigated, showing a marked influence, especially on the structural properties. Notably, at a high content, Sn favours the formation of rutile TiO2 at very low reaction temperatures (100°C), thanks to the structural compatibility with cassiterite SnO2. Selected samples were tested towards the photocatalytic degradation of tetracycline in water under UV light. Overall, the low-temperature treatment enables to tune the TiO2 phase composition while maintaining its surface hydrophilicity and gives rise to well-dispersed SnO2 at the TiO2 surface.
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Affiliation(s)
- Luca Rimoldi
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali (INSTM), Via Giusti 9, 50121 Firenze, Italy
| | - Daniela Meroni
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali (INSTM), Via Giusti 9, 50121 Firenze, Italy
| | - Eleonora Pargoletti
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali (INSTM), Via Giusti 9, 50121 Firenze, Italy
| | - Iolanda Biraghi
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy
| | - Giuseppe Cappelletti
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali (INSTM), Via Giusti 9, 50121 Firenze, Italy
| | - Silvia Ardizzone
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milano, Italy
- Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali (INSTM), Via Giusti 9, 50121 Firenze, Italy
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84
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Yang M, He H, Liao A, Huang J, Tang Y, Wang J, Ke G, Dong F, Yang L, Bian L, Zhou Y. Boosted Water Oxidation Activity and Kinetics on BiVO 4 Photoanodes with Multihigh-Index Crystal Facets. Inorg Chem 2018; 57:15280-15288. [PMID: 30507184 DOI: 10.1021/acs.inorgchem.8b02570] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The crystal facet of the BiVO4 photoanode has potential influence on its charge-transfer and separation properties as well as water oxidation kinetics. In the present work, a BiVO4 polyhedral film with exposed {121}, {132}, {211}, and {251} high-index facets was synthesized by a facile Bi2O3 template-induced method and investigated as a photoanode for water oxidation. In comparison with the normal BiVO4 film with a {121} monohigh-index facet, the BiVO4 film with multihigh-index crystal facets shows higher activity and faster kinetics for photoelectrochemical water oxidation. Specifically, a higher photocurrent density of 1.21 mA/cm2 was achieved on the multihigh-index facet BiVO4 photoanode at 1.23 V versus reversible hydrogen electrode (RHE) in 0.1 M Na2SO4, which is about 200% improved over the normal BiVO4 photoanode (0.61 mA/cm2 at 1.23 V vs RHE). In addition, a negative shift of 300 mV onset potential for water oxidation was observed on the as-prepared BiVO4 photoanode (0.22 V vs RHE) relative to the normal BiVO4 photoanode (0.52 V vs RHE) in 0.1 M Na2SO4. Although the UV-vis absorbance property and water oxidation pathway not be changed, the charge-transfer and separation properties as well as the overall water oxidation kinetics on the multihigh-index facet BiVO4 film were boosted obviously. Theory calculations reveal that the adsorption of H2O molecules on BiVO4{121} and {132} high-index facets is energetically favorable for subsequent dissociation and oxidation relative to that on {010} and {110} low-index facets. Furthermore, the water oxidation limiting step on {121} and {132} high-index facets of BiVO4 is changed to the step of two protons reacting with •O to form •OOH species (•O + H2O(l) + 2H+ + 2e- → •OOH + 3H+ + 3e-), which is different from the limiting step on {010} and {110} low-index facets that corresponds to the dissociation of H2O to •OH (2H2O(l) + • → •OH + H2O(l) + H+ + e-). In addition, the overpotential of water oxidation limiting step on BiVO4{121} and {132} high-index facets is lower than that on {010} and {110} low-index facets.
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Affiliation(s)
- Minji Yang
- State Key Laboratory of Environmental-Friendly Energy Materials, Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang 621010 , China
| | - Huichao He
- State Key Laboratory of Environmental-Friendly Energy Materials, Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang 621010 , China
| | - Aizhen Liao
- Ecomaterials and Renewable Energy Research Center, School of Physics , Nanjing University , Nanjing 211102 , China
| | - Ji Huang
- State Key Laboratory of Environmental-Friendly Energy Materials, Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang 621010 , China
| | - Yi Tang
- State Key Laboratory of Environmental-Friendly Energy Materials, Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang 621010 , China
| | - Jun Wang
- State Key Laboratory of Environmental-Friendly Energy Materials, Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang 621010 , China
| | - Gaili Ke
- State Key Laboratory of Environmental-Friendly Energy Materials, Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang 621010 , China
| | - Faqin Dong
- State Key Laboratory of Environmental-Friendly Energy Materials, Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang 621010 , China
| | - Long Yang
- State Key Laboratory of Environmental-Friendly Energy Materials, Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang 621010 , China
| | - Liang Bian
- State Key Laboratory of Environmental-Friendly Energy Materials, Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, School of Materials Science and Engineering , Southwest University of Science and Technology , Mianyang 621010 , China
| | - Yong Zhou
- Ecomaterials and Renewable Energy Research Center, School of Physics , Nanjing University , Nanjing 211102 , China
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85
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Pepin PA, Lee JD, Murray CB, Vohs JM. Thermal and Photocatalytic Reactions of Methanol and Acetaldehyde on Pt-Modified Brookite TiO2 Nanorods. ACS Catal 2018. [DOI: 10.1021/acscatal.8b03081] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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86
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Wang L, Xie Y, Liu W, Wang Q, Cao W. Synthesis of mesoporous core-shell TiO 2 microstructures with coexposed {001}/{101} facets: enhanced intrinsic photocatalytic performance. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:31250-31261. [PMID: 30194570 DOI: 10.1007/s11356-018-3113-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Accepted: 08/30/2018] [Indexed: 06/08/2023]
Abstract
TiO2 microstructures were synthesized via a facile one-step route for enhanced intrinsic photocatalytic performance. The prepared TiO2 microstructures are featured by both mesoporous core-shell structures and coexposed {001}/{101} facets. Their intrinsic photocatalytic performance were remarkably enhanced due to their high specific surface area, coexposed {001}/{101} facets, and promoted separation of photogenerated carriers. Furthermore, the origin and detailed mechanism for diethylenetriamine (DETA) that served as a high efficient stabilizer of TiO2 {001} facet have been theoretically investigated. Finally, a new DETA-modified Ostwald ripening mechanism was originally proposed when studying the growth mechanism of the mesoporous core-shell TiO2 spherical microstructures with coexposed {001}/{101} facets.
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Affiliation(s)
- Liang Wang
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Yingjuan Xie
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Wenxiu Liu
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Qi Wang
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Wenbin Cao
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
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87
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Vaiano V, Lara M, Iervolino G, Matarangolo M, Navio J, Hidalgo M. Photocatalytic H2 production from glycerol aqueous solutions over fluorinated Pt-TiO2 with high {001} facet exposure. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.07.032] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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88
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Relationship of Crystals Shape, Aggregation Mode and Surface Purity in Catalytic Wet Peroxide Oxidation of Phenol in Dark with Titania Anatase Nanocrystals. Catal Letters 2018. [DOI: 10.1007/s10562-018-2557-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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89
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Xiong Z, Lei Z, Li Y, Dong L, Zhao Y, Zhang J. A review on modification of facet-engineered TiO2 for photocatalytic CO2 reduction. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2018. [DOI: 10.1016/j.jphotochemrev.2018.07.002] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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90
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Synthesis of edge-site selectively deposited Au nanocrystals on TiO2 nanosheets: An efficient heterogeneous catalyst with enhanced visible-light photoactivity. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.07.041] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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91
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Lee TY, Lee CY, Chiu HT. Enhanced Photocatalysis from Truncated Octahedral Bipyramids of Anatase TiO 2 with Exposed {001}/{101} Facets. ACS OMEGA 2018; 3:10225-10232. [PMID: 31459151 PMCID: PMC6644679 DOI: 10.1021/acsomega.8b01251] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 08/17/2018] [Indexed: 06/10/2023]
Abstract
In this study, we develop a new synthetic method to grow anatase TiO2 crystals composed of truncated octahedral bipyramids (TOBs) with exposed {001} and {101} facets by a vapor-solid reaction growth (VSRG) method. The VSRG method employs TiCl4(g) to react with CaO(s)/Ca(OH)2(s) at 823-1043 K under atmospheric pressure. The O-deficient pale-blue TOB TiO2 crystals display high amount of both {001} and {101} facets. Together, they decompose methylene blue photocatalytically under UV-visible (UV-vis) light irradiation. The most-efficient TOB catalyst VT923 (grown at 923 K, average edge length 400 nm, average thickness 200 nm, and surface area 4.20 m2/g) shows a degradation rate constant k, 0.0527 min-1. This is close to that of the P25 standard 0.0577 min-1. However, the surface area of P25 (46.8 m2/g) is about 12 times that of VT923. The extraordinary performance of VT923 is attributed to the presence of high amount of coexisting {001} and {101} facets to form effective surface heterojunctions. They would separate photogenerated electrons and holes effectively on {101} and {001} surfaces, respectively. For VT923, the {001}/{101} ratio is 0.764, which is close to 1, the highest value observed for all TOB samples grown in this study. The surface heterojunctions prolong the electron-hole separation so that VT923 demonstrates the excellent photocatalytic capability. In addition, residual Cl atoms on the exposed faces are easily removed to show clean TiO surface layers with sufficient amount of O-deficient sites in the current samples.
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Affiliation(s)
- Tzu-Yuan Lee
- Department
of Applied Chemistry, Nation Chiao Tung
University, Hsinchu, Taiwan 30010, ROC
| | - Chi-Young Lee
- Department
of Materials Science and Engineering, National
Tsing Hua University, Hsinchu, Taiwan 30013, ROC
| | - Hsin-Tien Chiu
- Department
of Applied Chemistry, Nation Chiao Tung
University, Hsinchu, Taiwan 30010, ROC
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92
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Seadira T, Sadanandam G, Ntho TA, Lu X, Masuku CM, Scurrell M. Hydrogen production from glycerol reforming: conventional and green production. REV CHEM ENG 2018. [DOI: 10.1515/revce-2016-0064] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The use of biomass to produce transportation and related fuels is of increasing interest. In the traditional approach of converting oils and fats to fuels, transesterification processes yield a very large coproduction of glycerol. Initially, this coproduct was largely ignored and then considered as a useful feedstock for conversion to various chemicals. However, because of the intrinsic large production, any chemical feedstock role would consume only a fraction of the glycerol produced, so other options had to be considered. The reforming of glycerol was examined for syngas production, but more recently the use of photocatalytic decomposition to hydrogen (H2) is of major concern and several approaches have been proposed. The subject of this review is this greener photocatalytic route, especially involving the use of solar energy and visible light. Several different catalyst designs are considered, together with a very wide range of secured rates of H2 production spanning several orders of magnitude, depending on the catalytic system and the process conditions employed. H2 production is especially high when used in glycerol-water mixtures.
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93
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Zhou X, Wang Z, Xia X, Shao G, Homewood K, Gao Y. Synergistic Cooperation of Rutile TiO 2 {002}, {101}, and {110} Facets for Hydrogen Sensing. ACS APPLIED MATERIALS & INTERFACES 2018; 10:28199-28209. [PMID: 30058320 DOI: 10.1021/acsami.8b07816] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
An oriented TiO2 thin film-based hydrogen sensor has been demonstrated to have excellent sensing properties at room temperature. The exposed high energy surface offers a low energy barrier for H2 adsorption and dissociation. In this work, rutile TiO2 with {101} and {002} facets exposed was controllably synthesized by adjusting the ethanol content of the hydrothermal solvent. The crystalline structure, morphologies, and H2 sensing performance of the samples varied with the relative ratios of {002} and {101} facets. By increasing the ethanol content, the (002) orientation growth was enhanced and the (101) orientation growth was restrained, the size of the nanorods composing the thin film was reduced and the density of the film was increased. All of the prepared TiO2 nanorod array film-based hydrogen sensors performed very well at room temperature. The TiO2 hydrogen sensor with both {110} and {002} facets exposed gave a faster response, as well as better repeatability and stability than those with only {002} facets. Density functional theory simulations have been adopted to reveal the surface interaction of H2 and the TiO2 surface. The results suggested that H2 tended to be adsorbed and dissociated on the (002) and (101) surface. There is a very small active barrier for atomic H to recombine into H2 molecules on the (110) surface. Thin films with lower density, where more (110) surface is exposed, offered more space for H2 regeneration, leading to shorter response and recovery times as well as higher sensitivity. The (002), (101), and (110) surfaces of rutile TiO2 synergistically cooperated to complete the whole H2 sensing process.
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Affiliation(s)
- Xiaoyan Zhou
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science & Engineering , Hubei University , Wuhan 430062 , China
| | - Zhuo Wang
- State Center for International Cooperation on Designer Low-carbon & Environmental Materials , Zhengzhou University , 100 Kexue Avenue , Zhengzhou 450001 , China
- Zhengzhou Materials Genome Institute , Zhongyuanzhigu, Xingyang 450100 , China
| | - Xiaohong Xia
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science & Engineering , Hubei University , Wuhan 430062 , China
| | - Guosheng Shao
- State Center for International Cooperation on Designer Low-carbon & Environmental Materials , Zhengzhou University , 100 Kexue Avenue , Zhengzhou 450001 , China
- Zhengzhou Materials Genome Institute , Zhongyuanzhigu, Xingyang 450100 , China
| | - Kevin Homewood
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science & Engineering , Hubei University , Wuhan 430062 , China
| | - Yun Gao
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, School of Materials Science & Engineering , Hubei University , Wuhan 430062 , China
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94
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Zhang C, Cao A, Chen L, Lv K, Wu T, Deng K. One-step topological preparation of carbon doped and coated TiO 2 hollow nanocubes for synergistically enhanced visible photodegradation activity. RSC Adv 2018; 8:21431-21443. [PMID: 35539909 PMCID: PMC9080932 DOI: 10.1039/c8ra02427h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 05/31/2018] [Indexed: 11/21/2022] Open
Abstract
Various three-dimensional TiO2 hollow structures have attracted strong scientific and technological attention due to their excellent properties. 3D hierarchical TiO2 hollow nanocubes (TiO2-HNBs) are not good candidates for industrial photocatalytic applications due to their large energy gap which is only activated by UV light. Herein, visible-light-responsive carbon doped and coated TiO2-HNBs (C@TiO2-HNBs) with a dominant exposure of {001} facets have been prepared via a template-engaged topotactic transformation process using facile one-step solvothermal treatment and a solution containing ethanol, glucose and TiOF2. The effects of reaction time and glucose/TiOF2 mass ratio on the structure and performance of C@TiO2-HNBs were systematically studied. We found that glucose played an important role in providing H2O during the topological transformation from self-templated TiOF2 cubes into 3D hierarchical TiO2 hollow nanocubes versus dehydration reactions, where its main function was as a carbon source. Coated carbon was deposited predominantly on the surface as sp2 graphitic carbon in extended p conjugated graphite-like environments, and doped carbon mainly replaced Ti atoms in the surface lattice to form a carbonate structure. The results were confirmed using TEM SEM, EDS, XRD, FT-IR, XPS and Raman spectroscopic studies. The C@TiO2-HNBs achieved greatly improved RhB photodegradation activity under visible light irradiation. The catalyst prepared with glucose/TiOF2 at a mass ratio of 0.15 (T24-0.15) showed the highest photodegradation rate of 96% in 40 min, which is 7.0 times higher than those of the TiO2-HNBs and P25. This new synthetic approach proposes a novel way to construct carbon hybridized 3D hierarchical TiO2 hollow nanocubes by combining two modification methods, "element doped" and "surface sensitized", at the same time.
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Affiliation(s)
- Chengjiang Zhang
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities Wuhan 430074 P. R. China +86-27-67842752 +86-27-67842752
| | - Amin Cao
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities Wuhan 430074 P. R. China +86-27-67842752 +86-27-67842752
| | - Lianqing Chen
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities Wuhan 430074 P. R. China +86-27-67842752 +86-27-67842752
- Department of Chemistry, University of Wisconsin-Platteville Platteville 53818 USA
| | - Kangle Lv
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities Wuhan 430074 P. R. China +86-27-67842752 +86-27-67842752
| | - Tsunghsueh Wu
- Department of Chemistry, University of Wisconsin-Platteville Platteville 53818 USA
| | - Kejian Deng
- Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities Wuhan 430074 P. R. China +86-27-67842752 +86-27-67842752
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95
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Peng T, Zhang J, Ray S, Fakhouri H, Xu X, Arefi-Khonsari F, Lalman JA. Enhanced TiO 2 nanorods photocatalysts with partially reduced graphene oxide for degrading aqueous hazardous pollutants. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:17553-17564. [PMID: 29663296 DOI: 10.1007/s11356-018-1886-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Accepted: 03/26/2018] [Indexed: 06/08/2023]
Abstract
Enhanced TiO2 nanorods (TNRs) with partially reduced graphene oxide (RGO) (designated as GT) were prepared for degrading aqueous hazardous pollutants. The degree of RGO oxidation had an important role in affecting the photoelectronic and photocatalytic activities of GT composites. The study examined the impact of the degree of RGO oxidation on the photocatalytic activities. The photocatalytic activity of the materials was investigated for degrading rhodamine b (RhB), methyl orange (MO), methylene blue (MB), and phenol by using ultraviolet (UV) light. The highest photocatalytic activity was observed when the atomic oxygen-to-carbon (O/C) ratio of RGO was 0.130 ± 0.003. This study suggested the photocatalytic performance was maximized by preserving a selected amount of the RGO oxygen-containing groups. The work reported in this study on optimizing the RGO-based TiO2 photocatalyst could serve as a promising approach for preparing and optimizing other types of carbon-based photocatalysts such as graphene-based CdS.
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Affiliation(s)
- Tao Peng
- Department of Civil and Environmental Engineering, University of Windsor, 401 Sunset Ave, Windsor, ON, N9B 3P4, Canada
- Laboratoire Interfaces et Systèmes Electrochimiques, LISE, CNRS, Sorbonne Université, 75005, Paris, France
| | - Jian Zhang
- State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Srimanta Ray
- Department of Chemical Engineering, National Institute of Technology Agartala, Agartala, Tripura, 799055, India
| | - Houssam Fakhouri
- Laboratoire Interfaces et Systèmes Electrochimiques, LISE, CNRS, Sorbonne Université, 75005, Paris, France
| | - Xu Xu
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China
| | - Farzaneh Arefi-Khonsari
- Laboratoire Interfaces et Systèmes Electrochimiques, LISE, CNRS, Sorbonne Université, 75005, Paris, France.
| | - Jerald A Lalman
- Department of Civil and Environmental Engineering, University of Windsor, 401 Sunset Ave, Windsor, ON, N9B 3P4, Canada
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96
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Md
Saad SK, Ali Umar A, Ali Umar MI, Tomitori M, Abd. Rahman MY, Mat Salleh M, Oyama M. Two-Dimensional, Hierarchical Ag-Doped TiO 2 Nanocatalysts: Effect of the Metal Oxidation State on the Photocatalytic Properties. ACS OMEGA 2018; 3:2579-2587. [PMID: 31458546 PMCID: PMC6641261 DOI: 10.1021/acsomega.8b00109] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 02/20/2018] [Indexed: 05/19/2023]
Abstract
This paper reports the synthesis of two-dimensional, hierarchical, porous, and (001)-faceted metal (Ag, Zn, and Al)-doped TiO2 nanostructures (TNSs) and the study of their photocatalytic activity. Two-dimensional metal-doped TNSs were synthesized using the hydrolysis of ammonium hexafluorotitanate in the presence of hexamethylenetetramine and metal precursors. Typical morphology of metal-doped TNSs is a hierarchical nanosheet that is composed of randomly stacked nanocubes (dimensions of up to 5 μm and 200 nm in edge length and thickness, respectively) and has dominant (001) facets exposed. Raman analysis and X-ray photoelectron spectroscopy results indicated that the Ag doping, compared to Zn and Al, much improves the crystallinity degree and at the same time dramatically lowers the valence state binding energy of the TNS and provides an additional dopant oxidation state into the system for an enhanced electron-transfer process and surface reaction. These are assumed to enhance the photocatalytic of the TNS. In a model of photocatalytic reaction, that is, rhodamine B degradation, the AgTNS demonstrates a high photocatalytic activity by converting approximately 91% of rhodamine B within only 120 min, equivalent to a rate constant of 0.018 m-1 and ToN and ToF of 94 and 1.57 min-1, respectively, or 91.1 mmol mg-1 W-1 degradation when normalized to used light source intensity, which is approximately 2 times higher than the pristine TNS and several order higher when compared to Zn- and Al-doped TNSs. Improvement of the crystallinity degree, decrease in the defect density and the photogenerated electron and hole recombination, and increase of the oxygen vacancy in the AgTNS are found to be the key factors for the enhancement of the photocatalytic properties. This work provides a straightforward strategy for the preparation of high-energy (001) faceted, two-dimensional, hierarchical, and porous Ag-doped TNSs for potential use in photocatalysis and photoelectrochemical application.
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Affiliation(s)
- Siti Khatijah Md
Saad
- Institute
of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
| | - Akrajas Ali Umar
- Institute
of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
- E-mail: (A.A.U.)
| | - Marjoni Imamora Ali Umar
- Department
of Physics Education, Faculty of Tarbiyah, Institut Agama Islam Negeri (IAIN), Batusangkar, 27213 West
Sumatra, Indonesia
| | - Masahiko Tomitori
- School
of Materials Science, Japan Advanced Institute
of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Mohd. Yusri Abd. Rahman
- Institute
of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
| | - Muhamad Mat Salleh
- Institute
of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
| | - Munetaka Oyama
- Nanomaterials
Chemistry Laboratory, Department of Materials Chemistry, Graduate
School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8520 Japan
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97
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Jiang W, Ji W, Au CT. Surface/Interfacial Catalysis of (Metal)/Oxide System: Structure and Performance Control. ChemCatChem 2018. [DOI: 10.1002/cctc.201701958] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Wu Jiang
- Key Laboratory of Mesoscopic Chemistry, MOE, School of Chemistry and Chemical Engineering; Nanjing University; Nanjing 210023 P.R. China
| | - Weijie Ji
- Key Laboratory of Mesoscopic Chemistry, MOE, School of Chemistry and Chemical Engineering; Nanjing University; Nanjing 210023 P.R. China
| | - Chak-Tong Au
- Department of Chemistry; Hong Kong Baptist University, Kowloon Tong; Hong Kong P.R. China
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98
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Meng J, Lin Q, Chen T, Wei X, Li J, Zhang Z. Oxygen vacancy regulation on tungsten oxides with specific exposed facets for enhanced visible-light-driven photocatalytic oxidation. NANOSCALE 2018; 10:2908-2915. [PMID: 29368784 DOI: 10.1039/c7nr08590g] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Introduced oxygen vacancy on WO3 with specific exposed facets was prepared through facile solvothermal treatment and different cooling methods. We demonstrated that the density of oxygen defects could be regulated by different cooling methods and speculated that oxygen vacancy with appropriate concentration range could promote photocatalytic activity through suppressing the recombination of photo-induced carriers. The specific exposed facets with higher oxidation efficiency were prepared by solvothermal reaction. WO3-A treated by air cooling exhibits the best photocatalytic oxygen evolution rate at 500 μmol g-1 h-1 using AgNO3 as sacrifice agent under visible light (λ > 400 nm) without any co-catalysts, which is about 2 times higher than WO3-N without oxygen defects. This strategy, using different cooling methods to regulate oxygen vacancy concentration on tungsten oxides, could contribute to the design of other high efficiency photocatalysts.
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Affiliation(s)
- Jie Meng
- Center of Electron Microscopy, State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China.
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99
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Bellardita M, Garlisi C, Venezia AM, Palmisano G, Palmisano L. Influence of fluorine on the synthesis of anatase TiO2 for photocatalytic partial oxidation: are exposed facets the main actors? Catal Sci Technol 2018. [DOI: 10.1039/c7cy02382k] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of fluorine on TiO2 exposed facets and on the physico-chemical properties was evaluated and a synergetic effect of the presence of fluorine and the facets' distribution was observed.
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Affiliation(s)
- Marianna Bellardita
- “Schiavello-Grillone” Photocatalysis Group
- Dipartimento di Energia
- Ingegneria dell'informazione
- e modelli Matematici (DEIM)
- Università degli Studi di Palermo
| | - Corrado Garlisi
- Department of Chemical Engineering
- Khalifa University of Science and Technology
- Masdar Institute
- Masdar City
- United Arab Emirates
| | | | - Giovanni Palmisano
- Department of Chemical Engineering
- Khalifa University of Science and Technology
- Masdar Institute
- Masdar City
- United Arab Emirates
| | - Leonardo Palmisano
- “Schiavello-Grillone” Photocatalysis Group
- Dipartimento di Energia
- Ingegneria dell'informazione
- e modelli Matematici (DEIM)
- Università degli Studi di Palermo
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100
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Choi GJ, Jung H, Kim DH, Sohn Y, Gwag JS. Photoelectrocatalytic effect of unbalanced RF magnetron sputtered TiO2 thin film on ITO-coated patterned SiO2 nanocone arrays. Catal Sci Technol 2018. [DOI: 10.1039/c7cy02371e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly increased photocurrent response of unbalanced RF magnetron sputtered TiO2 thin film on ITO-coated patterned SiO2 nanocone arrays.
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Affiliation(s)
- Gyu Jin Choi
- Department of Physics
- Yeungnam University
- Gyeongsan
- Republic of Korea
| | - Hyemin Jung
- Department of Physics
- Yeungnam University
- Gyeongsan
- Republic of Korea
| | - Dong Ho Kim
- Department of Physics
- Yeungnam University
- Gyeongsan
- Republic of Korea
| | - Youngku Sohn
- Department of Chemistry
- Chungnam National University
- Daejeon 34134
- Republic of Korea
| | - Jin Seog Gwag
- Department of Physics
- Yeungnam University
- Gyeongsan
- Republic of Korea
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