中文摘要：

采用溶剂热法制备了一系列花状BiOBrxI1-x复合微球。利用X射线粉末衍射（XRD）、热重（TG）、扫描电镜（SEM）、氮气物理吸附、傅里叶变换红外光谱（FT-IR）和紫外-可见（UV-Vis）漫反射（DRS）等手段考察了BiOBrxI1-x复合微球的热稳定性、相组成、形貌、光吸收性能和光催化活性随煅烧温度的变化规律。结果表明,BiOBrxI1-x复合样品的热稳定性小于BiOBr而高于BiOI。在煅烧过程中BiOBrxI1-x逐渐失去碘元素而转变为Bi5O7I,至500℃以后,复合物主要以溴氧铋化合物为主。BiOBrxI1-x在450℃以上煅烧其球形结构遭到破坏,同时比表面积迅速减小。BiOBr0.25I0.75,BiOBr0.5I0.5光催化活性要高于单纯BiOBr与BiOI。复合样品经过不同温度煅烧后,光催化活性均呈现了不同程度的降低。高温煅烧所引起碘元素的流失、微球结构的破坏,比表面积的减少等因数导致了光催化活性的降低。

英文摘要：

A series of flower-like Bi OBrxI1- xcomposite microspheres were prepared by solvothermal method. The thermostability of the microspheres and the effects of calcination temperature on their phase,morphology, light absorption and photocatalytic performance in degradation acid orange Ⅱ were investigated by X-ray diffraction（ XRD）,thermal gravity（ TG） analysis,N2-physical adsorption,scanning electron microscopy（ SEM）,Fourier translation infrared spectroscopy（ FT-IR）,and UV-Vis diffuse reflectance spectroscopy（ DRS）. The results show that the thermostability of the Bi OBr0. 25I0. 75 islower than Bi OBr and slight higher than Bi OI. During calcination,with the loss of I element,new Bi5O7 I appeares. The compounds are mainly composed of Bismuth oxygen bromide after 500 ℃. The spherical structure is destroyed when calcined above 450 ℃,and specific surface area decrease rapidly. The photocatalytic activity of Bi OBr0. 25I0. 75 and Bi OBr0. 5I0. 5is higher than Bi OBr and Bi OI. After calcination,activity appeared obvious decline. The destruction of morphology and composition,and the loss of surface area which attributed to high-temperature calcination would cause the decrease in photocatalytic performance.