摘要
采用水热法,在较低温度下合成了系列Bi2Mo1-xWxO6固溶体。结果表明,W的替代抑制了固溶体的晶粒生长,导致了较小的晶粒尺寸。随着x的增加,红外光谱中840cm-1处M-O键的振动频率νM-O有规律地向低频率方向移动,表明Mo6+离子逐步被W6+替代,生成了无限互溶的固溶体。光吸收性能研究表明,随着W6+逐步替代Mo6+,带隙出现了先降后升的趋势,x=0.4时带隙最小。而固溶体的光催化性能随着x的增加,出现了先增后减的趋势,x=0.4时光催化活性最高。此外,含W样品的光催化活性高于Bi2MoO6。这与固溶体的带隙、带结构和晶粒尺寸变化有关。
Solid solution Bi2Mo1-xWxO6（x=0-1.0） were synthesized employing hydrothermal method at lower temperatures. XRD results showed that the introduction of W inhibited the crystalline grain growth of the solid solutions and led to smaller crystal sizes. With an increase in W content, IR band around 840 cm^-1 monotonically shifted to lower frequency, revealing the formation of infinitely soluble solid solutions. UV-Vis diffuse reflectance spectra showed that the band gaps of solid solutions firstly decreased. The band gap of Bi2Mo0.6W0.4O6 was the smallest, and then the band gaps of solid solutions increased. At the same time, with increasing W contents, photocatalytic activities of solid solutions increased firstly, reached the best at x =0.4, and then decreased again. Furthermore, photocatalytic activities of the samples containing W were better than that of Bi2MoO6. This might be resulted from the band gap, band structure and the variation of the crystal size of solid solutions.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2010年第1期138-143,共6页
Chinese Journal of Inorganic Chemistry
基金
北京市自然科学基金(No.4082008)资助项目
