Fabrication and characterization of ZnTiO3/Zn2Ti3O8/ZnO ternary photocatalyst for synergetic removal of aqueous organic pollutants and Cr(VI) ions

Highly efficient photocatalysts have great development prospects in wastewater treatment, especially in the degradation of organic pollutants and reduction of inorganic heavy metal ions. Herein, a Z-scheme ZnTiO3/Zn2Ti3O8/ZnO ternary photocatalyst was prepared by the solvothermal-calcination method...

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Bibliographic Details
Published in:The Science of the total environment 2020-03, Vol.706, p.136026-136026, Article 136026
Main Authors: Chen, Fanyun, Yu, Changlin, Wei, Longfu, Fan, Qizhe, Ma, Fei, Zeng, Julan, Yi, Junhui, Yang, Kai, Ji, Hongbing
Format: Article
Language:English
Subjects:
Cr(VI) removal
Organic pollutants degradation
Photocatalysis
Ternary photocatalyst
Z-scheme
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Summary:Highly efficient photocatalysts have great development prospects in wastewater treatment, especially in the degradation of organic pollutants and reduction of inorganic heavy metal ions. Herein, a Z-scheme ZnTiO3/Zn2Ti3O8/ZnO ternary photocatalyst was prepared by the solvothermal-calcination method and the influence of the content of tetrabutyl titanate precursor and different reaction temperature on the crystal phase structures, photoelectrochemical properties and photocatalytic activities of the samples were investigated. Due to its unique Z-scheme structure and suitable band gap position, which is favorable for the efficient migration and separation of photo-generated electrons and holes and the improvement of photocatalytic redox reaction capability, the samples show excellent performance for the degradation of organic pollutants and reduction of heavy metal Cr(VI) ions. Based on a series of characterization analyses, a possible Z-scheme photocatalytic mechanism is proposed. This work provides a simple preparation method for fabrication of multivariate heterojunction photocatalyst for degradation of organic pollutants and removal of heavy metal ions. [Display omitted] •A two-step route for building ZnTiO3/Zn2Ti3O8/ZnO nanostructure was developed.•Experiment parameters on the crystal structure and photocatalytic performance were optimized.•The excellent removal efficiency for organic pollutants and Cr(VI) ions were obtained simultaneously.•A unique Z-scheme could illuminate the high removal performance.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2019.136026