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Cited 30 time in webofscience Cited 45 time in scopus
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Solvent-mediated synthesis of BiOI with a tunable surface structure for effective visible light active photocatalytic removal of Cr(VI) from wastewater

Authors
Arumugam, MalathiYu, YiseulJung, Hyeon JinYeon, SanghunLee, HyeyeonTheerthagiri, JayaramanLee, Seung JunChoi, Myong Yong
Issue Date
Jun-2021
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Keywords
BiOI; Solvent effect; Photocatalytic reduction; Cr(VI) removal; Visible light
Citation
ENVIRONMENTAL RESEARCH, v.197
Indexed
SCIE
SCOPUS
Journal Title
ENVIRONMENTAL RESEARCH
Volume
197
URI
https://scholarworks.bwise.kr/gnu/handle/sw.gnu/3637
DOI
10.1016/j.envres.2021.111080
ISSN
0013-9351
Abstract
The present study investigated the effect of various solvents on the tunable surface morphology and photocatalytic activity (PCA) of bismuth oxyiodide (BiOI), which could be used for the reduction of Cr(VI) under visible light irradiation (VLI). BiOI samples exhibiting different morphologies, i.e., two-dimensional square-like nanosheet and three-dimensional hierarchical flower-like morphology, were synthesized by a hydro/solvothermal process using different solvents, namely H2O, MeOH, EtOH, and ethylene glycol (EG). The crystal structure, surface morphology, surface area, light-absorption capability, and recombination rate of the photogenerated charge carriers were examined by X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller analysis, UV-vis diffuse reflectance spectroscopy, photoluminescence, and transient photocurrent analyses, respectively. The BiOI sample fabricated in EG showed excellent photocatalytic efficiency (similar to 99%) for the reduction of Cr(VI) after 90 min under VLI. The enhanced PCA demonstrated that the high surface area and well-structured surface characteristics of flower-like 3D BiOI microspheres played important roles in the photoreduction process. Moreover, a plausible mechanism for the reduction of Cr(VI) over the EG-BiOI photocatalyst was proposed. The results of the PCA evaluation and recycle test revealed that 3D EG-BiOI microspheres could serve as promising materials for the efficient removal of Cr(VI) from wastewater. Additionally, EG-BiOI could be utilized in other environmental remediation processes.
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