纳米片状BiOCl光催化剂的制备及其催化性能研究

Preparation and photocatalytic perfermance of BiOCl nanosheets

以五水硝酸铋和氯化钾为主要原料,水为溶剂,采用水热法合成了BiOCl粉末状光催化剂.应用X射线粉末衍射(XRD)、扫描电镜(SEM)、能谱分析(EDS)等对所制备的光催化剂进行了表征.以高压汞灯为紫外光源,甲基橙为目标降解物,对该催化剂的催化性能进行评价,系统考察了催化剂添加量、甲基橙初始浓度、光强、pH值、电解质等因素对BiOCl光催化降解甲基橙效率的影响.SEM结果表明:所制备的粉末为纳米片状结构;降解实验结果表明:初始pH值、染料浓度、光源功率以及不同电解质等因素对BiOCl的光催化性能均具有一定影响,在较大功率光源照射条件下,在pH为2,添加NaCl或者Na2SO4电解质溶液时,BiOCl催化降解甲基橙的效果最好.

The BiOC1 powders photocatalysts were synthesized by the hydrothermal synthesis method using Bi （NO3）3 .5H20, KC1 as the main raw materials and H20 as the solvent. The prepared BiOC1 powders were characterized by X-ray diffraction （XRD） , scanning electron microscopy （SEM） and EDAX. SEM results show that the prepared powders are microflakes with nanosize thickness. The photocatalytie activity of BLOC1 powders was evaluated through the degradation of methyl orange （MO） in aqueous solution illuminated by high pressure mercury lamp. Effects of the adding amount of catalysts, MO initial concentration, light intensity, initial pH value and electrolyte added on the BLOC1 photocatalytic activity were studied. Degradation experiments showed that all the above factors could influence the catalytic performance of BiOC1. MO phtocatalysis achieved the best effect in the solution adding NaC1 or Na2 SO4 electrolyte at pH = 2 under a high power source irradiation.