大比表面积、高孔隙率多孔仿生CeO2-CuO光催化剂

以富含多孔结构的纤维素为诱导体,采用浸渍法制备仿生CeO_2-CuO催化材料,通过X射线衍射(XRD)、场发射扫描电子显微镜(SEM)、透射电子显微镜(TEM)、氮气吸附-脱附(N2adsorption-desorption)、紫外-可见漫反射光谱(UV-vis)等分析手段对产物的结构和形貌进行了表征。在可见光条件下,以亚甲基蓝溶液为模拟废水,测试其TOC(Total organic carbon)去除率,并对光催化降解机理进行探讨。实验结果表明所制备的材料颗粒均匀,平均颗粒尺寸在10nm左右,并且含有丰富的介孔结构,其孔径集中分布于5~10nm。由紫外-可见漫反射吸收光谱可知,材料对可见光的吸收程度高于块状氧化铈,从而具有更高的可见光催化活性,光照2.5h后对亚甲基蓝的TOC去除率为90%。

Porous Biomorphic CeO2-CuO Photocatalyst with High Specific Surface Area and High Porosity

Biomorphic CuO-CeO2 catalyzer was prepared by impregnation method using porous fibrous body as inductor,whose structure and morphology was analyzed by XRD,SEM,TEM,N2 adsorption-desorption,and UV-vis spectrometry etc..The catalyzer′s TOC(total organic carbon)removal rateunder visible light was evaluatedby using methylene blue (MB)solution as simulated wastewater,and the photocatalytic mechanism was also discussed.The re-sults showed that the CuO-CeO2 catalyzer has abundant mesoporous structures(pore diameter 5-10 nm)and a rela-tively small particle size (10 nm).The biomorphic CuO-CeO2 catalyzer showed higher absorption of visible light com-pared with bulk CeO2 ,which could be excited by visible light irradiation and more active for pollutants catalytic degra-dation,as TOC removal rate for MB could reach 90% after 2.5 h irradiation.