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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。
SnO4.5H2O, ZnNO3.6H2O, HCl, NaOH and FeCl3.6H2O were used as raw materials to prepare Fe-doped nano-ZnO / SnO2 composite powders by coprecipitation method. The degradation of methyl orange solution was used as a model and analyzed by transmission electron microscopy TEM) and X-ray diffraction (XRD) were used to study the effect of heat treatment temperature on the catalytic activity of 0.2wt% Fe-Zn4Sn1 (ZnO / SnO2 = 4/1 And the impact of the structure. The results showed that the photocatalytic activity first increased and then decreased with the increase of the heat treatment temperature. The highest photocatalytic activity of the obtained FZS powder was obtained at 650 ℃ and the degradation rate of methyl orange was 89.63% (UV Light for 50 min). With the heat treatment temperature increases, the particle size of FZS powder gradually increases, the dispersion is still good. When the heat treatment temperature reached 750 ℃, with the increase of heat treatment temperature, the agglomeration of FZS powder was obvious and the specific surface area decreased sharply, which led to the decrease of photocatalytic activity. When the heat treatment temperature is higher than 850 ℃, Zn2SnO4 crystal appears in the sample, and the photocatalytic activity is also decreased.