Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 914, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.165326
Keywords
BiOI; Metal organic framework; P-n heterojunction; Photocatalytic degradation; Norfloxacin
Categories
Funding
- Natural Science Foundation of Jiangsu Province [BK20190245]
- QingLan Project of Jiangsu Province, Technology Support Program (Agriculture) of Taizhou [TN202122/SNY20210010]
- Research Foundation for Talented Scholars of Taizhou University [QD2016006]
- Undergraduate Training Program for Innovation and Entrepreneurship of Jiangsu Province [202112917038Y]
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This study developed BiOI/TiO2/ZIF-8 heterojunctions to enhance the photocatalytic degradation efficiency of norfloxacin, with ZIF-8 playing a key role in improving adsorption and photocatalytic activity. This work provides a new idea for designing photocatalytic heterostructures with more active species for potential application in environmental treatment.
The overuse of norfloxacin (NOR) has attracted wide attention because of the persistence and bio-accumulate in ecosystems and the negative impacts on human health. To solve the environmental issue, BiOI/TiO2 p-n heterojunctions have been developed and decorated with a porous ZIF-8 to obtain novel hollow BiOI/TiO2/ZIF-8 heterojunctions, which were further characterized by XRD, SEM, HRTEM, XPS, BET, UV-vis DRS, photoluminescence, ESR, photocurrent and EIS analyses. The BiOI/TiO2/ZIF-8 heterojunctions exhibited evidently improved photocatalytic performance compared with pristine BiOI, TiO2 and BiOI/TiO2 composites under visible light irradiation. ZIF-8 plays a key role in both the enhancement of adsorption and the photocatalytic activity in NOR removal. center dot O-2(-) and center dot OH radicals were the two dominating active species in the photocatalytic process according to the trapping experiments. In 2-BTZ system, large specific surface area, highly effective charge carrier migration with inhibiting recombination, more negative CB and positive VB to generate more active center dot O-2(-) and center dot OH species resulted in superior photocatalytic activity. This work provides a new idea to design a kind of photocatalytic heterostructure with more active species for potential application in the field of environmental treatment. (C) 2022 Elsevier B.V. All rights reserved.
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