Controlled hydrothermal synthesis of bismuth oxychloride/bismuth oxybromide/bismuth oxyiodide composites exhibiting visible-light photocatalytic degradation of 2-hydroxybenzoic acid and crystal violet.

Author(s) Siao, C.W.; Chen, H.L.; Chen, L.W.; Chang, J.L.; Yeh, T.W.; Chen, C.C.
Journal J Colloid Interface Sci
Date Published 2018 Sep 15
Abstract

This paper presents an unprecedented systematic synthetic study of a controlled hydrothermal method for the preparation of bismuth oxychloride/bismuth oxybromide/bismuth oxyiodide ternary composites (BiOCl/BiOBr/BiOI). The pH, temperature, and KCl:KBr:KI molar ratio for the reactions were adjusted to control the compositions and morphologies of BiOCl/BiOBr/BiOI composites. Scanning electron microscopy-energy dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction, ultraviolet-visible diffuse reflectance spectroscopy, Brunauer-Emmett-Teller specific surface areas, photoluminescence spectroscopy, and X-ray photoelectron spectroscopy, and electron paramagnetic resonance spectroscopy were applied to the products. The photocatalytic activities of dispersions were examined by monitoring the 2-hydroxybenzoic acid (HBA) and crystal violet concentrations. Various scavengers demonstrated quenching effects. O was crucial to HBA degradation, whereas h and OH played minor roles in HBA degradation. This text hypothesizes possible photodegradation mechanisms.

DOI 10.1016/j.jcis.2018.04.097
ISSN 1095-7103
Citation J Colloid Interface Sci. 2018;526:322336.

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