Exquisitely designed TiO 2 quantum dot/Bi 2 O 2 CO 3 nano-sheet S-scheme heterojunction towards boosted photo-catalytic removal.

Autor: Sun Y; College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China., Shi Q; College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China; Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resource & Key Laboratory of Agricultural Ecological Security and Green Development at Universities of Inner Mongolia Autonomous, Hohhot 010018, China. Electronic address: qqshi@imau.edu.cn., Gu X; State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; University of Chinese Academy of Sciences, Beijing, China., Wang B; Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China. Electronic address: bl.wang@siat.ac.cn., Lumbers B; Faculty of Technology & Bionics, Rhine-Waal University of Applied Sciences, 47533 Kleve, Germany., Li G; State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China; University of Chinese Academy of Sciences, Beijing, China. Electronic address: gaoli@dicp.ac.cn.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2024 May 15; Vol. 662, pp. 76-86. Date of Electronic Publication: 2024 Feb 06.
DOI: 10.1016/j.jcis.2024.02.004
Abstrakt: The development of novel semiconductor photo-catalysts for the efficient degradation of antibiotics poses a considerable challenge in the context of ever-increasing environmental pollution. Herein, an S-scheme photo-catalyst consisting of TiO 2 quantum dots (QDs, size ∼4-6 nm) anchored on Bi 2 O 2 CO 3 nano-sheets was synthesised via a facile hydrothermal protocol. TiO 2 /Bi 2 O 2 CO 3 (TB) nano-composite exhibits enhanced photo-catalytic removal of tetracycline, achieving ∼0.0158 min -1 photo-degradation rates using visible light, which is 3- and 53-fold greater than that of pristine TiO 2 and Bi 2 O 2 CO 3 , respectively. The theoretical calculations substantiate that the built-in electric field in the TB nano-composite is conducive to the separation and transfer of photo-excited carriers. Notably, the generated superoxide radicals rather than hydroxyl were identified as the responsible species for tetracycline degradation. In addition, the corresponding degradation pathway and eco-toxicity analysis were also elucidated. In conclusion, this work contributes valuable insights and presents a feasible approach for the fabrication of S-scheme photo-catalysts (TiO 2 QDs and bismuth-based nano-materials), thereby enabling the efficient removal of water pollutants.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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