NiO/介孔SiO_2复合材料的制备及其光催化性能

将N-十六烷基乙二胺三乙酸同时用作螯合剂与结构导向剂,经由以阴离子模板法制备介孔SiO2(AMS)的路径一步法制得了一系列NiO/介孔SiO2复合体。借助XRD,HRTEM和N2-吸附脱附对该复合材料的形貌和结构进行了表征。以甲基橙溶液模拟偶氮染料废水,在紫外光照条件下将所制备的介孔复合材料、市售P25和以EO20PO70EO20(P123)为模板合成的介孔TiO2分别进行光催化氧化性能的测试,以脱色率为指标考察了光催化剂的催化活性中心类型、数目以及催化剂的比表面积等因素对甲基橙光降解效率的影响。结果表明:所制备NiO/介孔SiO2复合材料对甲基橙的降解能力优于市售P25,并且该催化剂具有良好的可再生性。

Synthesis and Photocatalytic Properties of NiO/Mesoporous SiO2 Composites

N-hexadecyl ethylenediamine triacetate was used both as the chelating agent and the structure-directing agent in a one-step synthesis of NiO/mesoporous SiO2composites via AMS route.The morphology and structure of the composites were characterized by XRD,HRTEM and N2 adsorption-desorption measurements.Methy l orange solution simulated azo dye wastewater was bleached under UV irradiation separately by the synthesized composites,the commercially P25 and the mesoporous TiO2prepared by EO20PO70EO20（ P123） as template.Factors such as the type and the number of photocatalytic center,and the surface area of the catalyst were investigated depending on the decoloration rate.The results show that the prepared NiO/mesoporous SiO2 composites has a good reproducibility and exhibited better photocatalytic activity than that of P25,which is considered to be a very promising photocatalyst.