Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 694, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.133756
Keywords
Few-layer; WS2; BiOBr; Heterostructure; Photocatalytic degradation
Categories
Funding
- Major Science and Technology Program for Water Pollution Control and Treatment of China [2015ZX07204-002]
- Science and Technology Innovation Talents Program of Xinxiang City [CXRC17001]
- Key Research Project of Colleges and Universities of Henan Province [17B150008]
- Science and Technology Key Projects of Xinxiang City [CXGG17004]
- Foundation of Henan Normal University [20180446]
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Herein, an efficient broad-spectrum WS2/BiOBr heterostructure with ultrathin nanosheet was successfully prepared by one-pot hydrothermal route. The self-assembled flower-likeWS(2)/BiOBr nanostructure was formed by few-layer WS2 and BiOBr nanosheets. The optimized heterojunction presented broad-spectrum high-efficiency photocatalytic activity towards the removal of various pollutants under visible-light irradiation, including organic dyes, antibiotics and phenols. This efficiency was linked to high light harvesting combined with effective charge separation/transfer. Meanwhile, the degradation efficiencies varied with nature of the pollutant decreased in the following order: LR5B (99%) > MNZ (97%) > TC (92%) > OTC (92%) > RhB (90%) > CIP (83%) > MB (78%) > MO (62%) > bisphenol (42%) > phenol (40%). The photocatalytic process of ciprofloxacin was explored, and the results indicated that high ciprofloxacin concentrations, low pH values and elevated concentrations of ions (PO43-, HPO42-, H2PO4-, and Cu2+) restrained the photocatalytic performances. Trapping experiments and ESR revealed the significant contribution of holes (h(+)) in the mechanism, where both superoxide radicals (center dot O-2(-)) and hydroxyl radicals (center dot OH) acted as assistants. Overall, this work could offer a new protocol for the design of highly efficient heterostructure photocatalysts for environmental remediation. (C) 2019 Elsevier B.V. All rights reserved.
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