多级结构BiOCl的可控制备及对药物废水的有效降解

Tunable Synthesis of Hierarchical Bi OCl Microspheres for Efficient Photocatalytic Degradation of Pharmaceutical Wastewater

以Bi Cl3为原料,二乙二醇(DEG)为介质,尿素为沉淀剂,采用溶剂热法合成了不同尺寸的多级结构BiOCl微纳米材料.通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)对产物进行了表征.结果表明,沉淀剂用量和溶剂热时间对BiOCl的结晶特性和形貌尺寸有重要影响.控制反应条件制得了粒径大小为1~5μm的BiOCl多级微球.降解药物废水测试结果表明,所制备的催化剂均能有效降解卡马西平(CBZ)和磺胺甲唑(SMZ)溶液,特别是溶剂热时间为30 min,沉淀剂尿素与Bi Cl3的摩尔比为10∶1和15∶1时制得的光催化剂对CBZ和SMZ均表现出最好的光催化活性,且降解率均高于TiO2(P25).

A series of hierarchical BiOC1 microspheres with different sizes was prepared with a diethylene glycol（DEG） mediated solventhermal method using BiC13 as precursor and urea as a precipitant. The obtained samples were characterized by powder X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results suggest that the crystallinity and size could be influenced by precipitants dosage （ molar ratio of urea to BiC13 ） and solventhermal time. BLOC1 microspheres with sizes of 1--5 I^m were synthesized by tuning reaction conditions. The as-prepared BLOC1 exhibited high photocatalytic efficiency towards the degradation of carbamazepine（CBZ） and sulfamethoxazole （SMZ） under UV light irradiation. Especially, BLOC1 samples obtained at precipitants dosages of 10 ： 1 and 15 ： 1 with hydrothermal time of 30 min exhibited superior photo-catalytic activity to TiO2（ P25 ）. The results indicate that the hierarchical BLOCl microspheres are promising candidate for the removal of the recalcitrant pharmaceutical contaminants.