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Effects of pH on hydrothermal synthesis and characterization of visible-light-driven BiVO4 photocatalyst

✍ Scribed by Aiping Zhang; Jinzhi Zhang; Naiyi Cui; Xiaoyun Tie; Yanwei An; Lingjie Li

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
778 KB
Volume
304
Category
Article
ISSN
1381-1169

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✦ Synopsis

BiVO 4 powders were hydrothermally synthesized at different pHs and characterized by XRD, SEM, DRS, nitrogen adsorption and Raman techniques. It revealed that the pH values of the precursors can influence significantly on the morphologies and structures of the products. The photocatalytic activities of the catalyst obtained were evaluated by the decolorization of methyl orange in aqueous solution under visible light irradiation. It was found that monoclinic BiVO 4 showed better photocatalytic activities than those shown by the tetragonal phase under visible light, which are attributed to its wider bandgap. The results also revealed that the dispersive particles with larger surface area represented higher activities than the coagulate ones when considering their photocatalysis.

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