光催化
材料科学
甲基橙
热液循环
纳米结构
化学工程
四方晶系
纳米技术
半导体
带隙
相(物质)
光电子学
催化作用
化学
有机化学
工程类
作者
Xiaojing Shi,Xin Chen,Xiliang Chen,Shu Zhou,Shiyun Lou,Yongqiang Wang,Lin Yuan
标识
DOI:10.1016/j.cej.2013.02.034
摘要
Controlled BiOBr hierarchical nanostructures (HNs) have been fabricated by a polyvinyl pyrrolidone (PVP) assisted hydrothermal method. The as-synthesized samples have a tetragonal phase and are composed of primary plate-like nanostructures with a thickness from 10 to 300 nm. Hall Effect displays the new material is N-type semiconductor. The possible reaction and growth mechanism is also discussed based on contradistinctive experimental results. Concentration of PVP in the reaction mixture plays a key role for controllable structures and morphologies because PVP can attach on the (0 1 2) plane of the BiOBr HNs selectively and insulate the growth of this plane. In addition, PVP is used to manipulate the band gaps of products. The as-prepared BiOBr HNs possess narrow band gaps (1.75–2.5 eV), large surface areas, and uniform particle size. Moreover, photocatalytic degradation efficiencies of methyl orange (MO) of BiOBr samples are detected and the as-obtained results show an excellent photocatalytic capacity of BiOBr HNs under irradiation of visible light (λ ⩾ 420 nm).
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