六元瓜环-CdS复合光催化剂的合成及其光催化性能

Synthesis and Photocatalytic Properties of Cucurbit[6] Uril-CdS Composite Photocatalyst

以氯化镉和硫代乙酰胺为原料,六元瓜环(Q[6])为修饰剂,采用化学沉淀法制备了Q[6]-CdS复合光催化剂。利用Fourier变换红外光谱、X射线粉末衍射和扫描电子显微镜对样品的晶相结构和微观形貌进行表征,研究了修饰剂六元瓜环对样品结构和光催化性能的影响。结果表明:Q[6]-CdS复合光催化剂的光催化性能明显高于纯CdS,且催化稳定性好。在Q[6]用量为0.15 mmol时获得的微球状Q[6]-CdS对亚甲基蓝和结晶紫的光催化效果最好。50 mL浓度为28 mg/L的结晶紫溶液,在10 mg Q[6]-CdS的催化作用下反应200 min时,降解率达到93.5%;而50 mL浓度为6 mg/L的亚甲基蓝溶液,在10 mg Q[6]-CdS的催化作用下反应100 min时,降解率达到93.8%,光催化效率比CdS高出了64.8%。

The Q[6]–CdS composite photocatalyst was prepared by a chemical precipitation method with cadmium chloride and thiacetamide （TAA） as raw materials and cucurbit[6] uril as a modifier. The structure and morphology of the product were characterized by Fourier transform infrared spectroscopy, X–ray diffraction and scanning electron microscopy, respectively. The effect of cucurbit[6] uril on the morphology and photocatalytic properties of the product was investigated. The results show that the product is a hexagonal cadmium sulfide modified by cucurbit[6] uril, and the photocatalytic activity is greater than that of cadmium sulfide. When the amount of Q[6] is 0.15 mmol and Q[6]–CdS is microspheres, this composite photocatalyst has the optimum photocatalytic property on methylene blue and crystal violet. The degradation rate can reach 93.5% when the solution with 28 mg/L crystal violet is 50mL, Q[6]–CdS amount as a catalyst is 10 mg and the reaction is 200 min. The degradation rate is 93.8%, and the photocatalytic efficiency is 64.8% greater than that of CdS when the solution with 6 mg/L methylene blue is 50 mL, Q[6]–CdS amount as a catalyst is 10 mg and the reaction is 100 min. Also, Q[6]–CdS has a high photocatalytic stability.