Synthesis of monoclinic structured BiVO4 spindly microtubes in deep eutectic solvent and their application for dye degradation
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- 作者：Wei Liu ; Yaqin Yu ; Lixin Cao ; Ge Su ; Xiaoyun Liu ; Lan Zhang ; Yonggang Wang
- 关键词：Bismuth vanadate ; Deep eutectic solvent ; Microtube ; Photocatalyst
- 刊名：Journal of Hazardous Materials
- 出版年：2010
- 出版时间：15 September 2010
- 年：2010
- 卷：181
- 期：1-3
- 页码：1102-1108
- 全文大小：620 K
文摘
Monoclinic structured spindly bismuth vanadate microtubes were fabricated on a large scale by a simple ionothermal treatment in the environment-friendly green solvent of urea/choline chloride. The as-prepared samples were characterized by XRD, SEM, TEM, IR and their photocatalytic activity was evaluated by photocatalytic decolorization of rhodamine B aqueous solution under visible-light irradiation. As-obtained BiVO4 microtubes exhibit the spindly shape with a side length of ca. 800 nm and a wall thickness of ca. 100 nm. The opening of these microtubes presents a saw-toothed structure, which is seldom in other tube-shaped materials. The formation mechanism of the spindly microtubes is ascribed to the complex cooperation of the reaction–crystallization process controlled by BiOCl and the nucleation-growth process of nanosheets induced by solvent molecules attached on the surface of microtubes. Such spindly microtubes exhibit much higher visible-light photocatalytic activity than that of bulk BiVO4 prepared by solid-state reaction, possibly resulting from their large surface area and improved crystallinity.