反应介质对ZnO粉体材料结构、吸附及光催化性能的影响  

INFLUENCE OF REACTION MEDIA ON THE STRUCTURE AND ADSORPTION AND PHOTO-CATALYTIC PERFORMANCE OF ZnO POWDER MATERIALS

作　　者：梁春华[1,2] 徐满才[2] LIANG Chunhua XU Mancai(College of Chemistry and Materials Engineering, Huaihua University Huaihua 418008, China College of Chemistry and Chemical Engineering, Hunan Normal University Changsha 410081, China)

机构地区：[1]怀化学院化学与材料科学工程学院,怀化418008 [2]湖南师范大学化工学院,长沙410081

出　　处：《离子交换与吸附》2017年第2期153-159,共7页Ion Exchange and Adsorption

基　　金：湖南省科技厅科技计划项目(项目编号:2016NK2134)

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。Two ZnO powder material samples, ZnO-1 and ZnO-2, were prepared by using Zn（NO3）2·6H2O and NaOH as raw materials via inorganic phase alkaline precipitation in the reaction media of water, and via organic phase sol method in the reaction media of ethanol and acetyl acetone mixture, respectively. Structure and morphology of the two samples were characterized by X-ray diffraction and scanning electronic microscopy, and the results showed that both of the samples belonged to the hexagonal wurtzite structure, but their morphology were significantly different： ZnO-1 was cobble-like, and ZnO-2 was rob-like. Adsorption isotherms of the two samples for methyl orange in aqueous solution were measured, and the results showed that the maximum adsorption capacity of ZnO-2 amounted to 38.9mg/g, while that of ZnO-1 was 28.Smg/g. Photo-catalytic activity of the two samples was tested, and the results showed that the de-colorization efficiency for 20mg/L methyl orange solution reached 78.4% under the irradiation of a 300W ultraviolet lamp （365nm） for 180min with a dosage of lg/L ZnO-2. and the photo-catalytic activity did not decrease significantly after used for four times.

关 键 词：氧化锌粉体材料 反应介质 吸附 光催化 

分 类 号：O647.3[理学—物理化学] O643.3[理学—化学]