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Laghaei M, Ghasemian M, Ferdowsi MRG, Schütz JA, Kong L. Enhanced pollutant photodegradation over nanoporous titanium-vanadium oxides with improved interfacial interactions. J Colloid Interface Sci 2023; 646:11-24. [PMID: 37178611 DOI: 10.1016/j.jcis.2023.04.180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 04/27/2023] [Accepted: 04/30/2023] [Indexed: 05/15/2023]
Abstract
This study addressed the separation problem of colloidal catalytic powder from its solution and pore blockage of traditional metallic oxides by fabricating nanoporous composites of titanium (Ti)-vanadium (V) oxide via magnetron sputtering, electrochemical anodization, and annealing processes. The effect of V-deposited loading on the composite semiconductors was investigated by varying V sputtering power (20-250 W) to correlate their physicochemical properties to the photodegradation performance of methylene blue. The obtained semiconductors revealed circular and elliptical pores (14-23 nm) and formed different metallic and metallic oxide crystalline phases. Within the nanoporous composite layer, V ions substituted Ti4+, leading to Ti3+ formation accompanied by decreased band gap values and higher visible-light absorption. Thus, the band gap of TiO2 was 3.15 eV, while that of Ti-V oxide with the maximum V content (at 250 W) was 2.47 eV. The interfacial separators between clusters in the mentioned composite created traps disrupting the charge carrier movements between crystallites, thereby decreasing the photoactivity. In contrast, the composite prepared with the minimum V content showed approximately 90% degradation efficiency under solar-simulated irradiation resulting from the homogeneous V dispersion and the lower recombination possibility, owing to its p-n heterojunction constituent. The nanoporous photocatalyst layers with their novel synthesis approach and outstanding performance can be applied in other environmental remediation applications.
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Affiliation(s)
- Milad Laghaei
- School of Engineering, Deakin University, Waurn Ponds, VIC 3216, Australia; Institute for Frontier Materials, Deakin University, Waurn Ponds, VIC 3216, Australia.
| | - Mohsen Ghasemian
- Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | | | - Jürg A Schütz
- Commonwealth Scientific and Industrial Research Organization (CSIRO), 75 Pigdons Road, Waurn Ponds, Vic 3216, Australia
| | - Lingxue Kong
- Institute for Frontier Materials, Deakin University, Waurn Ponds, VIC 3216, Australia.
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Li Y, Zhang MQ, Liu YF, Sun YX, Zhao QH, Chen TL, Chen YF, Wang SF. In Situ Construction of Bronze/Anatase TiO 2 Homogeneous Heterojunctions and Their Photocatalytic Performances. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:1122. [PMID: 35407240 PMCID: PMC9000825 DOI: 10.3390/nano12071122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 03/24/2022] [Accepted: 03/24/2022] [Indexed: 02/04/2023]
Abstract
Photocatalytic degradation is one of the most promising emerging technologies for environmental pollution control. However, the preparation of efficient, low-cost photocatalysts still faces many challenges. TiO2 is a widely available and inexpensive photocatalyst material, but improving its catalytic degradation performance has posed a significant challenge due to its shortcomings, such as the easy recombination of its photogenerated electron-hole pairs and its difficulty in absorbing visible light. The construction of homogeneous heterojunctions is an effective means to enhance the photocatalytic performances of photocatalysts. In this study, a TiO2(B)/TiO2(A) homogeneous heterojunction composite photocatalyst (with B and A denoting bronze and anatase phases, respectively) was successfully constructed in situ. Although the construction of homogeneous heterojunctions did not improve the light absorption performance of the material, its photocatalytic degradation performance was substantially enhanced. This was due to the suppression of the recombination of photogenerated electron-hole pairs and the enhancement of the carrier mobility. The photocatalytic ability of the TiO2(B)/TiO2(A) homogeneous heterojunction composite photocatalyst was up to three times higher than that of raw TiO2 (pure anatase TiO2).
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Affiliation(s)
- Yong Li
- Innovation Center of Materials for Energy and Environment Technologies, College of Science, Tibet University, Lhasa 850000, China; (Y.L.); (M.-Q.Z.); (Y.-F.L.); (Y.-X.S.); (Q.-H.Z.)
- Institute of Oxygen Supply, Center of Tibetan Studies (Everest Research Institute), Tibet University, Lhasa 850000, China
- Key Laboratory of Cosmic Rays (Tibet University), Ministry of Education, Lhasa 850000, China
| | - Ming-Qing Zhang
- Innovation Center of Materials for Energy and Environment Technologies, College of Science, Tibet University, Lhasa 850000, China; (Y.L.); (M.-Q.Z.); (Y.-F.L.); (Y.-X.S.); (Q.-H.Z.)
- Institute of Oxygen Supply, Center of Tibetan Studies (Everest Research Institute), Tibet University, Lhasa 850000, China
| | - Yan-Fang Liu
- Innovation Center of Materials for Energy and Environment Technologies, College of Science, Tibet University, Lhasa 850000, China; (Y.L.); (M.-Q.Z.); (Y.-F.L.); (Y.-X.S.); (Q.-H.Z.)
- Institute of Oxygen Supply, Center of Tibetan Studies (Everest Research Institute), Tibet University, Lhasa 850000, China
| | - Ya-Xun Sun
- Innovation Center of Materials for Energy and Environment Technologies, College of Science, Tibet University, Lhasa 850000, China; (Y.L.); (M.-Q.Z.); (Y.-F.L.); (Y.-X.S.); (Q.-H.Z.)
- Institute of Oxygen Supply, Center of Tibetan Studies (Everest Research Institute), Tibet University, Lhasa 850000, China
| | - Qing-Hua Zhao
- Innovation Center of Materials for Energy and Environment Technologies, College of Science, Tibet University, Lhasa 850000, China; (Y.L.); (M.-Q.Z.); (Y.-F.L.); (Y.-X.S.); (Q.-H.Z.)
- Institute of Oxygen Supply, Center of Tibetan Studies (Everest Research Institute), Tibet University, Lhasa 850000, China
| | - Tian-Lu Chen
- Key Laboratory of Cosmic Rays (Tibet University), Ministry of Education, Lhasa 850000, China
| | - Yuan-Fu Chen
- School of Electronic Science and Engineering, and State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
| | - Shi-Feng Wang
- Innovation Center of Materials for Energy and Environment Technologies, College of Science, Tibet University, Lhasa 850000, China; (Y.L.); (M.-Q.Z.); (Y.-F.L.); (Y.-X.S.); (Q.-H.Z.)
- Institute of Oxygen Supply, Center of Tibetan Studies (Everest Research Institute), Tibet University, Lhasa 850000, China
- Key Laboratory of Cosmic Rays (Tibet University), Ministry of Education, Lhasa 850000, China
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Wang H, Li X, Zhao X, Li C, Song X, Zhang P, Huo P, Li X. A review on heterogeneous photocatalysis for environmental remediation: From semiconductors to modification strategies. CHINESE JOURNAL OF CATALYSIS 2022. [DOI: 10.1016/s1872-2067(21)63910-4] [Citation(s) in RCA: 108] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Hong J, Xu C, Deng B, Gao Y, Zhu X, Zhang X, Zhang Y. Photothermal Chemistry Based on Solar Energy: From Synergistic Effects to Practical Applications. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2103926. [PMID: 34825527 PMCID: PMC8787404 DOI: 10.1002/advs.202103926] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Revised: 10/23/2021] [Indexed: 05/07/2023]
Abstract
With the development of society, energy shortage and environmental problems have become more and more outstanding. Solar energy is a clean and sustainable energy resource, potentially driving energy conversion and environmental remediation reactions. Thus, solar-driven chemistry is an attractive way to solve the two problems. Photothermal chemistry (PTC) is developed to achieve full-spectral utilization of the solar radiation and drive chemical reactions more efficiently under relatively mild conditions. In this review, the mechanisms of PTC are summarized from the aspects of thermal and non-thermal effects, and then the interaction and synergy between these two effects are sorted out. In this paper, distinguishing and quantifying these two effects is discussed to understand PTC processes better and to design PTC catalysts more methodically. However, PTC is still a little far away from practical. Herein, several key points, which must be considered when pushing ahead with the engineering application of PTC, are proposed, along with some workable suggestions on the practical application. This review provides a unique perspective on PTC, focusing on the synergistic effects and pointing out a possible direction for practical application.
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Affiliation(s)
- Jianan Hong
- State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou310027China
| | - Chenyu Xu
- Department of Chemical and Materials EngineeringUniversity of AlbertaEdmontonAlbertaT6G 1H9Canada
| | - Bowen Deng
- Graduate School of Chemical Sciences and EngineeringHokkaido UniversitySapporo060‐0814Japan
| | - Yuan Gao
- State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou310027China
| | - Xuan Zhu
- State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou310027China
| | - Xuhan Zhang
- State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou310027China
| | - Yanwei Zhang
- State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou310027China
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