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通过溶剂热法合成了BiOClxI1-x系列复合半导体。采用X射线粉末衍射、扫描电子显微镜、氮气物理吸附、热重、Fourier变换红外光谱和紫外–可见漫反射等技术对BiOCl_xI_(1–x)的热稳定性、物相组成、形貌、光吸收性能和光催化活性因受热而发生的变化规律进行了考察。结果表明:BiOCl_xI_(1–x)复合样品的热稳定性优于BiOI而远弱于BiOCl;热处理导致复合物中碘元素逐渐释放而转变为Bi_5O_7I,至500℃以后,复合物组成主要为氯氧铋化合物;高温煅烧对复合物的整体形貌造成很大程度破坏;BiOCl_(0.25)I_(0.75)、BiOCl_(0.5)0I_(0.5)0的光催化性能优于纯BiOCl与BiOI;经过不同温度煅烧后,催化剂的光催化活性均呈现了不同程度减弱;热处理所引起的碘元素流失、组织结构破坏、比表面积减小和表面脱羟基等造成了光催化活性的降低。
BiOClxI1-x series composite semiconductors were synthesized by solvothermal method. The thermal stability, phase composition, morphology, optical absorption of BiOCl_xI_ (1-x) were characterized by X-ray powder diffraction, scanning electron microscopy, nitrogen physical adsorption, thermogravimetry, Fourier transform infrared spectroscopy and UV- Performance and photocatalytic activity due to heat changes occurred were investigated. The results show that the thermal stability of BiOCl_xI_ (1-x) composite sample is better than that of BiOI and much weaker than that of BiOCl. The thermal treatment leads to the gradual release of iodine in the complex and the conversion to Bi_5O_7I. After 500 ℃, The photocatalytic activity of BiOCl_ (0.25) I_ (0.75), BiOCl_ (0.5) 0I_ (0.5) 0 is better than that of pure BiOCl and BiOI. The calcination at different temperatures After calcination, the photocatalytic activity of the catalyst showed different degrees of weakening; heat treatment caused by the loss of iodine, the destruction of the structure, the specific surface area and surface dehydroxylation led to the reduction of photocatalytic activity.