坡缕石/Al掺杂CdS复合材料光催化降解罗丹明B

Photocatalytic degradation of rhodamine B by palygorskite/ Al-doped CdS composite

摘要:

采用溶剂热法制备了坡缕石/Al掺杂CdS复合材料（PGS/CdS-Al），运用XRD、XPS、SEM、UV-Vis DRS及PL对材料的结构、形貌以及光学性能进行表征。Al元素成功掺杂到CdS中，没有改变CdS的晶体结构，但CdS的禁带变宽。可见光照射下，该复合材料对孔雀石绿、亚甲基蓝、甲基橙、结晶紫、罗丹明B等有机染料均有光催化降解活性，且罗丹明B的光催化降解效果最好。光照40 min，0.67 g/L 15% PGS/CdS-Al对30 mL、20 mg/L罗丹明B的光降解率为98.7%，反应主要活性基团是h+。该降解反应符合一级动力学，反应速率常数为0.0065 min-1。

Abstract:

The palygorskite /Al-doped CdS composites (PGS/CdS-Al) were prepared by solvothermal method. The structure, morphology and optical properties of the composite materials were characterized to us XRD, XPS, SEM, UV-Vis DRS and PL. Al element was successfully doped into the lattice of CdS and the crystal structure of CdS didn't destroy. But the band gap of CdS was widened. Under visible light illumination, PGS/CdS-Al had photocatalytic degradation activity for organic dyes, such as malachite green, methylene blue, methyl orange, crystal violet and rhodamine B. And the best photocatalytic degradation effect was rhodamine B. The photodegradation rate was 98.7% when 0.67 g/L 15% PGS/CdS-Al was added to Rhodamine B solution (30 mL, 20 mg/L) under the light illumination for 40 min. Holes were the main activity group in photocatalytic reaction. The photodegradation reaction followed the first order kinetics and the rate constant was 0.0065 min-1.