【摘要】 以SnCl4.5H2O、ZnNO3.6H2O、HCl、NaOH、FeCl3.6H2O为原料,采用共沉淀法制备Fe掺杂纳米ZnO/SnO2复合催化剂粉体,以溶液降解甲基橙反应为模型,借助透射电镜(TEM)、X射线衍射(XRD)测试仪等研究了热处理温度对0.2wt%Fe-Zn4Sn1(ZnO/SnO2=4/1(物质的量比))复合催化剂(简为:FZS)粉体催化活性和结构的影响。结果表明:随着热处理温度的升高,光催化活性先升高后降低,热处理温度为650℃时所得的FZS粉体的光催化活性达到最高,对甲基橙的降解率为89.63%(紫外光照50 min)。随着热处理温度升高,FZS粉体的粒径逐渐增大,分散性仍然较好。当热处理温度达到750℃时,随着热处理温度的升高,FZS粉体团聚现象明显,比表面积急剧减小,使得光催化活性降低。在热处理温度高于850℃时,样品中出现Zn2SnO4晶体,也使得光催化活性降低。更多还原

【Abstract】 Fe doped ZnO/SnO2 nano-powder was prepared by coprecipitation method with SnCl4·5H2O,ZnNO3·6H2O,HCl,NaOH,FeCl3·6H2O as raw materials.The influence of heat treated temperature on the photocatalytic property and structure of nanometer compound photocatalyst(0.2wt%Fe-Zn4Sn1(ZnO/SnO2=4/1(mol ratio),abbreviated:FZS) powder was studied by X-ray diffraction(XRD) and transmission electron microscope(TEM) and other method and the degradation of methyl orange solution was as a reaction model.The results showed that the photoactivating activity of FZS powder first increased and then decreased when heat treated temperature increased,the photoactivating activity of FZS powder was maximum when heat treated temperature was 650 ℃,the degrading ratio of methyl orange was 89.63%(ultraviolet light for 50 min).The grain size of FZS powder increased gradually when heat treated temperature increased,the dispersion of powder was still better while heat treated temperature was 650 ℃.Agglomeration phenomenon was obvious and the specific surface area decreased sharply and the photoactivating activity decreased when heat treated temperature increased and heat treated temperature was above 750 ℃.There was Zn2SnO4 crystal phase and Zn2SnO4 crystal phase also made catalytic activity of FZS powder reduce when heat treated temperature was above 850 ℃.更多还原