CAJ | 학술논문

采用水热法,在较低温度下合成了系列Bi_2Mo_(1-x)W_xO_6固溶体.结果表明,W的替代抑制了同溶体的晶粒生长,导致了较小的晶粒尺寸.随着x的增加.红外光谱巾840 cm~(-1)处M-O键的振动频率V_(M-O)有规律地向低频率方向移动,表明Mo~(6+)离子逐步被W~(6+)替代,生成了无限互溶的同溶体.光吸收性能研究表明,随着W~(6+)逐步替代Mo~(6+),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Bi_2MoO_6.这与崮溶体的带隙、带结构和晶粒尺寸变化有关.
채용수열법,재교저온도하합성료계렬Bi_2Mo_(1-x)W_xO_6고용체.결과표명,W적체대억제료동용체적정립생장,도치료교소적정립척촌.수착x적증가.홍외광보건840 cm~(-1)처M-O건적진동빈솔V_(M-O)유규률지향저빈솔방향이동,표명Mo~(6+)리자축보피W~(6+)체대,생성료무한호용적동용체.광흡수성능연구표명,수착W~(6+)축보체대Mo~(6+),대극출현료선강후승적추세,x=0.4시대극최소.이고용체적광최화성능수착x적증가,출현료선증후감적추세,x=0.4시광최화활성최고.차외,함W양품적광최화활성고우Bi_2MoO_6.저여고용체적대극、대결구화정립척촌변화유관.
Solid solution Bi_2Mo_(1-x)W_xO_6(x=0～1.0) were synthesized employing hydrothermal method at lower tempe-ratures.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 Bi_2Mo_(0.6)W_(0.4)O_6 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 Bi_2MoO_6.This might be resulted from the band gap,band structure and the variation of the crystal size of solid solutions.