The Education Ministry Key Lab of Resource Chemistry, Department of Chemistry, Shanghai Normal University, Shanghai, 200234, P. R. China.
Dalton Trans. 2013 Jul 14;42(26):9706-12. doi: 10.1039/c3dt50498k. Epub 2013 May 17.
Three series of BiOM(x)R(1-x) (M, R = Cl, Br, I) solid solutions were systematically synthesized through a low-temperature precipitation. These solid solutions were characterized by XRD, FESEM, TEM, EDS, UV-vis spectra, nitrogen sorption/desorption, and PL. The tunable band gaps of the as-prepared solid solutions were realized via only changing the molar ratio of two halide ions. Meanwhile, the influence of citric acid in the formations of controllable morphological structures was discussed to study the growth mechanism of solid solutions. The photocatalytic activities of the bismuth oxyhalide solid solutions have also been investigated by the degradation of Rhodamine-B (RhB) under visible light irradiation. The optimized solid solutions possess higher photocatalytic activity than pure ones [BiOM (M = Cl, Br, I)] due to the broadened range of visible light response and the reduced recombination rate of electron-holes pairs. The results show that the synthesis of BiOM(x)R(1-x) (M, R = Cl, Br, I) solid solutions have profound significance for the design of the novel photocatalyst materials.
通过低温沉淀法系统合成了三组 BiOM(x)R(1-x)（M，R = Cl，Br，I）固溶体。通过 XRD、FESEM、TEM、EDS、UV-vis 光谱、氮气吸附/解吸和 PL 对这些固溶体进行了表征。通过仅改变两种卤化物离子的摩尔比，实现了所制备的固溶体可调的带隙。同时，通过研究固溶体的生长机制，讨论了柠檬酸在可控形态结构形成中的作用。通过在可见光照射下 Rhodamine-B（RhB）的降解，研究了铋氧卤固溶体的光催化活性。由于可见光响应范围的拓宽和电子-空穴对复合率的降低，优化后的固溶体具有比纯相[BiOM（M = Cl，Br，I）]更高的光催化活性。结果表明，BiOM(x)R(1-x)（M，R = Cl，Br，I）固溶体的合成对新型光催化剂材料的设计具有深远的意义。
