Quantum dots modified bismuth-based hierarchical dual Z-scheme heterojunction for photocatalytic performance enhancement: Mineralization, degradation pathways and mechanism

Yanbo Jiang; Jianyi Jiang; Qi Ran; Tian Li; Huan He; Junxia Liu; Huaqiang Chu; Minghao Sui; Bingzhi Dong

Chemical Engineering Journal Advances (Mar 2022)

Quantum dots modified bismuth-based hierarchical dual Z-scheme heterojunction for photocatalytic performance enhancement: Mineralization, degradation pathways and mechanism

Yanbo Jiang,
Jianyi Jiang,
Qi Ran,
Tian Li,
Huan He,
Junxia Liu,
Huaqiang Chu,
Minghao Sui,
Bingzhi Dong

Affiliations

Yanbo Jiang: Engineering & Technical Research Center for Smart Water, Guangxi Beitou Environmental Protection & Water Group, Nanning 530029, Guangxi Province, China
Jianyi Jiang: Engineering & Technical Research Center for Smart Water, Guangxi Beitou Environmental Protection & Water Group, Nanning 530029, Guangxi Province, China
Qi Ran: Engineering & Technical Research Center for Smart Water, Guangxi Beitou Environmental Protection & Water Group, Nanning 530029, Guangxi Province, China
Tian Li: Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China; Corresponding author at: College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Huan He: Department of Civil, Environmental, and Geo- Engineering, University of Minnesota - Twin Cities, 500 Pillsbury Dr. SE, Minneapolis, MN 55445, United States
Junxia Liu: School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, Guangdong Province, China
Huaqiang Chu: Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
Minghao Sui: Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
Bingzhi Dong: Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China

Journal volume & issue: Vol. 9
p. 100240

Abstract

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Solar-driven photocatalytic degradation is identified as a prospective technology in the realization of novel development in environmental remediation. In this work, the oriented (102) facets of BiOCl exhibited growth inhibition through microwave introducing (131) facets of Bi2MoO6. The specific Bi2MoO6/BiOCl construction pattern (BMO/BOCl) skillfully regulated the surface charge property, which was driven to couple with highly exposed active CdS quantum dots (QDs) (BMO/BOCl/CdS) via a novel room-temperature template synthesis. The conventional Type II heterojunction was transferred into dual Z-scheme heterojunction with the addition of CdS, which was successfully employed to degrade ciprofloxacin (CIP) under visible light irradiation. In the ternary BMO/BOCl/CdS system, QDs sensitized the catalyst and enhanced the response of visible light absorption. The hole of CdS was consumed with the optimal path, avoiding the photo-corrosion caused by the oxidation of S2−, which also retained the high redox capacity of the system. The regulated path consumed the hole of the CdS and maintained rapid electron-hole separation and high redox ability of the system. This was advantageous for enhancing the photocatalytic activity, especially with the optimized heterojunction, e.g. 100-BMO/BOCl/CdS exhibited distinguished photocatalytic activity of 96% CIP degradation under visible light irradiation. Furthermore, the constructed 100-BMO/BOCl/CdS heterojunction exhibited robust stability, which preserved high photocatalytic activity even after six cycles of degradation tests.

Published in Chemical Engineering Journal Advances

ISSN: 2666-8211 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Chemical technology: Chemical engineering
Website: https://www.journals.elsevier.com/chemical-engineering-journal-advances

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