磁性MCM-41/CdS的制备及其可见光催化性能研究

Preparation of magnetic MCM-41/CdS composite and its visible-light photocatalytic performance

采用两步沉淀法将CdS沉积在磁性MCM-41上,制备新型磁性MCM-41/CdS复合材料。通过X射线衍射光谱(XRD)、高分辨透射电镜(HRTEM)、紫外-可见吸收光谱(UV-Vis)、振动样品磁强计(VSM)等对其进行表征。以亚甲基蓝(methylene blue,简称MB)为模拟污染物,考察了磁性MCM-41/CdS复合材料的可见光催化性能。结果表明,CdS能有效地沉积在磁性MCM-41上,与CdS相比,该复合材料对MB的光催化降解效率明显提高,且可通过外加磁场进行分离。

Magnetic MCM-41/CdS composite was prepared via a two-step precipitation method through deposi- ting CdS on the magnetic MCM-41. XRD, HRTEM, UV-Vis absorption spectra and VSM were used to charac- terize the magnetic MCM-41/CdS composite. Methylene blue（MB） aqueous solution was used as a probe to evaluate the visible-light photocatalytic activity of magnetic MCM-41/CdS composite. The results showed that CdS was successfully deposited on the magnetic MCM-41, and magnetic MCM-41/CdS composite had higher visible-light photocatalytic activity than pure CdS. In addition, MCM-41/CdS composite could be easily separa- ted in an external magnetic field.