花状AgInS_2微球的制备及其光催化还原Cr(Ⅵ)

Fabrication of Flower-Like AgInS_2 Microspheres and Its Photocatalytic Reduction of Cr(Ⅵ)

通过溶剂热法合成了花状的AgInS_2微球,采用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电镜(TEM)、高倍透射电镜(HRTEM)、N_2等温吸脱附和紫外可见漫反射光谱(DRS)手段对所制备的样品进行了表征,同时以K_2Cr_2O_7作为目标降解物研究了AgInS_2微球的光催化性能.光催化降解结果显示,AgInS_2微球可对Cr(Ⅵ)实现高达95.4%的还原率,并保持了较好的结构稳定性,确保固体催化剂具备了良好再循环使用的性能,其高的还原效率是由于其高的结晶度以及大的比表面积可以产生更多的光生电子-空穴对,提供更多的反应活性位点所致.

Flower-like AgInS2 microspheres were successfully prepared by simple solvothermal method. The as- synthesized samples were characterized by the means such as XRD, SEM, TEM, HRTEM, N2 absorption-desorption and ultraviolet-visible DRS. Its reduction property of photocatalysis was analyzed for K2 Cr2 O7 as a target degradation substance. The result indicated that the photocatalytic reduction efficiency could reach 95.4%. This can be ascribed to its high crystallinity and large surface area, which produced more photo generated electron hole pairs and provided more reaction active sites. During the reaction process, AgInS2 microspheres show good recycling and reusing performance due to its stable structure. It broadened the application of sulfide compounds in the aspects of pollution prevention for heavy metals with providing a new method to control pollution and decrease toxicity of heavy metals.