化学浸渍法制备CdS/高岭土复合材料及其光催化性能

CdS/kaolinite composite prepared by chemical immersion method photocatalytic performance

为了解决CdS颗粒本身存在的易团聚、失活等问题,同时提升天然矿物的利用价值,本文以水洗高岭土为载体,乙酸镉和硫化钠为CdS前驱体,在一定条件下与高岭土进行浸渍反应,制备出一种可见光响应的新型高岭土基复合光催化材料。采用X射线衍射(XRD)、场发射扫描电镜(FESEM)、透射电镜(TEM)、比表面积和紫外-可见吸收光谱(UV-Vis)等手段对复合材料进行了理化特性分析,并考察了不同催化剂的可见光光催化活性。结果表明,复合材料实现了CdS粒子在高岭土片层结构上的紧密复合与有效分散,有效地抑制了光生载流子的复合,进而改善CdS光催化材料的光腐蚀性能,提高材料的光催化效率。

In order to solve the problems of easy agglomeration and deactivation of CdS,and enhance the utilization of natural minerals,water washed kaolinite as a carrier,cadmium acetate and sodium sulfide as precursors,a novel visible light responding CdS/kaolinite composite photocatalytic material was prepared through the impregnation method. The optical properties of the obtained composites and visible light photocatalytic activity of different catalysts were characterized by X-ray diffraction( XRD),field emission scanning electron microscope( FE-SEM),transmission electron microscope( TEM),N_2 adsorption-desorption analysis and UV-visible diffused reflectance spectroscopy( UV-vis). The CdS nanoparticles were firmly coating and effective dispersion on the lamellar structure of kaolinite,which could effectively restrain the recombination of photogenerated-carriers,improve optical corrosion properties of CdS photocatalytic materials and then further improve the photocatalytic efficiency.