CTAB作用下纳米复合材料ZnO-TiO2制备与多模式光催化降解罗丹明B

在模板剂十六烷基三甲基溴化铵作用下,通过溶胶-凝胶与程序升温溶剂热法制备了纳米复合材料ZnOTiO2(CTAB).经X-射线衍射(XRD)、紫外-可见漫反射吸收光谱(UV-Vis/DRS)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和N2吸附-脱附测试等手段对其组成、结构和形貌等进行了表征.结果显示,合成产物ZnO-TiO2(CTAB)主要晶型为ZnO纤锌矿,并部分生成ZnTiO3.同时,该合成产物经CTAB作用后,其对光的吸收发生明显红移,且平均孔径明显变小,BET值增大.在紫外光、可见光、模拟日光和微波辅助等不同模式光催化降解罗丹明B的实验研究中,与未经CTAB作用的样品ZnO-TiO2相比,ZnO-TiO2(CTAB)具有更高的光催化性能.同时,该复合材料在紫外光条件下,对甲基橙、罗丹明B、结晶紫、亚甲基蓝和龙胆紫5种不同结构染料的光催化中均表现出良好的降解效果.

The Preparation of Nanocomposite ZnO-TiO2 by CTAB-assisted and Photocatalytic Degradation Rhodamine B with Multiple Modes

The nano-composite ZnO-TiO2 under cetyltrimethyl ammonium bromide(CTAB) was prepared by the sol-gel method combined with temperature-programmed hydrothermal treatment. The phase composition, structure and morphology of the nano-composite ZnO-TiO2(CTAB) were well-characterized by X-ray diffraction(XRD), diffuse reflectance(UV-Vis/DRS), X-ray photoelectron spectroscopy(XPS), Scanning electron microscopy(SEM), Transmission electron microscopy(TEM) and N2 adsorption-desorption measurement. Results showed that the synthesized product ZnO-TiO2(CTAB) had mainly the ZnO wurtzite and part ZnTiO3 were generated. Meanwhile, the absorption band of as-product ZnO-TiO2(CTAB) was obviously red shifted with CTAB effect, and the average pore size of ZnO-TiO2(CTAB) was obviously reduced, moreover, of which the BET was increased. Compared with ZnO-TiO2, the nano-composite ZnO-TiO2(CTAB) without CTAB has better photocatalytic properties in the different modes including ultraviolet, visible light, simulated sunlight and microwave-assisted photocatalytic degradation of Rhodamine B. In addition, the nano-composite ZnO-TiO2(CTAB) showed good degradation for five different structure dyes including methyl orange, Rhodamine B, Crystal violet, Gentian violet and Methylene blue under UV light irradiation.