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通过溶胶凝胶法,经多次涂覆在SBA-15上负载掺杂镍的纳米TiO2,得到SBA-15/NiO/TiO2复合物;再以TiO2中还原态金属镍为催化剂,通过化学气相沉积法(CVD),在SBA-15/NiO/TiO2表面原位生长碳纳米管,制得SBA-15/Ni/TiO2/CNTs复合材料。通过XRD、SEM、TEM、UV-Vis和Raman等方法考察了SBA-15/Ni/TiO2/CNTs复合材料的结构和性能,并通过降解亚甲基蓝溶液评价其光催化活性。结果表明,SBA-15/Ni/TiO2/CNTs复合光催化剂的催化活性较SBA-15/NiO/TiO2显著提高。二次涂覆掺杂镍的二氧化钛制得的复合光催化剂的催化活性高于一次涂覆。
The SBA-15 / NiO / TiO2 composite was obtained by sol-gel method and coated with Ni-doped nano-TiO2 on SBA-15 for many times. Then the reduced nickel metal in TiO2 was used as catalyst to deposit the SBA- (CVD), SBA-15 / Ni / TiO2 / CNTs composites were prepared by in situ growth of carbon nanotubes on the surface of SBA-15 / NiO / TiO2. The structure and properties of SBA-15 / Ni / TiO2 / CNTs composites were investigated by XRD, SEM, TEM, UV-Vis and Raman. The photocatalytic activity of the composites was evaluated by degradation of methylene blue solution. The results show that the catalytic activity of SBA-15 / Ni / TiO2 / CNTs composite photocatalyst is significantly higher than that of SBA-15 / NiO / TiO2. The composite photocatalyst prepared by the secondary coating with nickel-doped titanium dioxide has higher catalytic activity than the primary coating.