反应介质对ZnO粉体材料结构、吸附及光催化性能的影响

发布时间：2018-03-27 19:42

本文选题：氧化锌粉体材料　切入点：反应介质　出处：《离子交换与吸附》2017年02期

【摘要】：以Zn(NO_3)_2·6H_2O和Na OH为原料,分别以无机溶剂(水)和有机溶剂(无水乙醇和乙酰丙酮的混合物)为反应介质,采用无机相碱沉淀法和有机相溶胶法,制备了两种ZnO粉体材料样品ZnO-1和ZnO-2。用X-射线衍射和扫描电镜对所制备的材料进行了结构与形貌表征,发现不同制备方法所得样品均为六方晶系纤锌矿结构,但材料的形貌有显著差异:无机相碱沉淀法制备的ZnO-1为鹅卵石状晶体,有机相溶胶法制备的ZnO-2为棒状晶体。测定了两种ZnO粉体材料对水溶液中甲基橙的吸附等温线,结果表明,ZnO-2对甲基橙的最大吸附容量达到38.9mg/g,而ZnO-1为28.8mg/g。测试了材料的光催化性能,结果表明,当甲基橙溶液初始浓度为20mg/L、ZnO样品的投加量为1g/L时,经300W高压汞灯照射3h后,ZnO-2棒状晶体对甲基橙溶液的降解率可达78.4%,所制备的材料重复使用4次均保持较高的催化活性。
[Abstract]:Using Zn(NO_3)_2 6H_2O and NaOH as raw materials and inorganic solvent (water) and organic solvent (mixture of anhydrous ethanol and acetylacetone) as reaction media respectively, the inorganic phase alkali precipitation method and organic phase sol method were used. Two kinds of ZnO powder samples ZnO-1 and ZnO-2 were prepared. The structure and morphology of the prepared materials were characterized by X-ray diffraction and scanning electron microscopy. It was found that the samples obtained by different preparation methods were hexagonal wurtzite structure. However, there are significant differences in morphology: ZnO-1 prepared by alkali precipitation method is cobblestone crystal and ZnO-2 prepared by organic phase sol method is rod crystal. The adsorption isotherms of methyl orange in aqueous solution by two kinds of ZnO powder materials have been determined. The results show that the maximum adsorption capacity for methyl orange is 38.9 mg / g and the ZnO-1 is 28.8 mg / g. The photocatalytic properties of the samples are measured. The results show that when the initial concentration of methyl orange solution is 20 mg / L 1g/L, After being irradiated with 300W high pressure mercury lamp for 3 h, the degradation rate of methyl orange solution by ZnO-2 rod-like crystal can reach 78.4%, and the prepared materials have high catalytic activity for 4 times.
【作者单位】：怀化学院化学与材料科学工程学院;湖南师范大学化工学院;
【基金】：湖南省科技厅科技计划项目(项目编号:2016NK2134)
【分类号】：TQ132.41;TB383.3

【相似文献】