Bi24O31Br10/BiOBr的控制合成及其光催化性能

Controllable Synthesis of Bi24O31Br10/BiOBr and Its Photocatalytic Performance

以十六烷基三甲基溴化铵（CTAB）和Bi（N03）3·5H20为原料，三乙醇胺（TEOA）为pH调节剂，通过溶剂热法制得／BiOBr。运用Bi24O31Br10RD、SEM、BET、UV-vis等手段对其结构进行了表征。结果表明：改变TEOA的体积，调节Br和Bi物质的量比可调控所得物质的组成、微结构和形貌。通过在可见光（λ≥420nnl）下降解环丙沙星（CIP）来评价所制得样品的光催化性能。结果表明，当TEOA的体积为8mL、Br和Bi物质的量比为1．0：1．0时，所得样品Bi24O31Br10／BiOBr（S-1．0-8）具有最佳的光催化性能，比表面积为28．20m。／g，CIP降解率为97．00％，反应速率常数为不加TEOA所得纯BiOBr的3．93倍。S-1．0-8最佳的光催化性能除了与光生电子和空穴的迁移有关外，还归因于其高的比表面积和表面丰富的氧空穴。

Bi24O31Br10/BiOBr composite was synthesized by a facile solvothermal method with cetyltrimethyl ammonium bromide （CTAB） and Bi（NO3）3.5H20 as materials, triethanolamine （TEOA） as pH regulator and characterized by X-ray diffractometer （XRD）, scanning electron microscope （SEM）, specific surface area （BET） measurement and UV-vis absorption spectrometer. The results showed that the composition, microstructure and morphology of sample could be easily controlled by tuning the amount of TEOA and the atomic ratio of bromide to bismuth in the reaction system. The photocatalytic activities of samples were evaluated by the degradation of ciprofloxacin （CIP） under visible light irradiation （λ≥420 nm）. When the volume of TEOA was 8 mL and the molar ratio of bromide to bismuth source was 1.0 ： 1.0, the obtained Bi24O31Br10/BiOBr （S-l.0-8） composite with a BET surface area of 28.20 m2/g exhibited the highest photocatalytic activity, and the degration of CIP was 97.00%. The reaction rate constant of composite was about 3.93 times higher than that of pure BiOBr, which was mainly attributed to the charge transfer between BiOBr and Bi24O31Br10. Besides, the large specific surface area of material and abundant oxygen vacancies on the surface of composite also contributed to the improvement of photocatalytic activity.