CTAB作用下纳米复合材料Ag/ZnO-SnO2的制备与光催化降解罗丹明B

在模板剂溴化十六烷基三甲基胺(CTAB)作用下,采用溶胶-凝胶法再结合程序升温溶剂热法制备了纳米复合材料Ag/ZnO-SnO2(CTAB),其中Ag,Zn,Sn摩尔比为0.1∶2∶1.利用X射线衍射(XRD)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、扫描电子显微镜配合X射线能量色散谱(SEM-EDS)和N2吸附-脱附测定等方法对复合材料的组成、结构及形貌等进行了表征.结果表明,该复合材料具有纤锌矿和金红石结构,Ag以单质形式存在.与未经CTAB作用的样品相比,Ag/ZnO-SnO2(CTAB)颗粒分布更均匀,且呈现规则的纳米棒状结构.复合材料在紫外光和可见光作用下对罗丹明B(RhB)的光催化降解结果显示,样品Ag/ZnO-SnO2(CTAB)的光催化活性明显高于Ag/ZnO-SnO2、ZnO-SnO2、ZnO和商用P-25.

Preparation of Ag/ZnO-SnO2 by CTAB-assisted and Photocatalytic Degradation of Rhodamine B

The nano-composite Ag/ZnO-SnO2 under cetyltrimethylammonium bromide(CTAB) was prepared with a molar ratio of Ag,Zn and Sn of 0.1∶2∶1 by the sol-gel method combined with temperature-programmed treatment.The phase composition,structures and morphologies of the nanocomposite Ag/ZnO-SnO2(CTAB) were characterized by X-ray diffraction(XRD),X-rayphotoelectron spectroscopy(XPS),transmission electron microscopy(TEM),N2 adsorption-desorption tests and scanning electron microscopy assisted X-rayenergy dispersive spectroscopy(SEM-EDS).The results show that the nanocomposite Ag/ZnO-SnO2 is well wurtzite and rutile structures,and Ag in the nano-composite Ag/ZnO-SnO2 is metallic Ag0.Compared with no CTAB-assisted nanocomposite,the nanocomposite Ag/ZnO-SnO2(CTAB) has uniformly distribution and shows regularly nano-rods.By the photocatalytic degradation of RhB,under UV and visble light irradiation,the photocatalytic activity of Ag/ZnO-SnO2 under CTAB-assisted is enhanced,of which is higher than that of Ag/ZnO-SnO2,ZnO-SnO2,ZnO and Degussa P-25.