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Mechanism of Visible‐Light Photocatalytic Mineralization of Indigo Carmine Using ZnBi 2 O 4 ‐Bi 2 S 3 Composites
Author(s) -
Thi Mai Tho Nguyen,
The Huy Bui,
Nha Khanh Dang Nguyen,
Quoc Thang Nguyen,
Thi Phuong Dieu Nguyen,
Dai Duong Bui,
Thi Kim Phuong Nguyen
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802151
Subject(s) - photocatalysis , indigo carmine , photodegradation , visible spectrum , aqueous solution , hydrothermal circulation , materials science , mineralization (soil science) , radical , photochemistry , irradiation , nuclear chemistry , chemistry , chemical engineering , catalysis , organic chemistry , optoelectronics , physics , nuclear physics , nitrogen , engineering
Novel highly visible‐light active ZnBi 2 O 4 ‐Bi 2 S 3 photocatalysts with various weight percentages of Bi 2 S 3 have been synthesized by a simple two‐step co‐precipitation and hydrothermal method. The efficacy of the as‐prepared ZnBi 2 O 4 ‐Bi 2 S 3 composites was evaluated for the degradation of Indigo carmine in aqueous solutions under visible light irradiation. It was found that the as‐prepared ZnBi 2 O 4 ‐Bi 2 S 3 composites showed was greatly enhanced photocatalytic activities as compared to that of pristine ZnBi 2 O 4 under visible light, which could be attributed to synergetic effects, charge transfer between ZnBi 2 O 4 and Bi 2 S 3 , as well as the separation efficiency of the photogenerated electrons and holes. The superoxide anion radical was the major active species responsible for the photodegradation process, whereas the contributions of the photoinduced h + and hydroxyl radicals were moderate and minor, respectively. These results demonstrate the feasibility of utilizing ZnBi 2 O 4 ‐Bi 2 S 3 as potential heterogeneous photocatalysts for environmental remediation.