氧化锌纳米棒的水热合成及其光催化性能  

Hydrothermal synthesis and photocatalytic activity of zinc oxide nanorods

作　　者：谢志强[1] 陈拥军[1] 

机构地区：[1]广西大学化学与化工学院,广西南宁530004

出　　处：《化学研究》2012年第5期52-56,共5页Chemical Research

基　　金：国家自然科学基金资助项目(50862001)

摘　　要：以分析纯ZnO作为锌源、NaOH为矿化剂、盐酸为反应溶液pH调节剂,利用水热反应制备了花状ZnO纳米棒;采用扫描电子显微镜和X射线衍射仪分析了产物的形貌和结构,考察了水热温度以及Zn2+和OH-浓度比对产物形貌的影响;以甲基橙为目标降解物,采用紫外-可见分光光度计研究了ZnO纳米棒的光催化性能.结果表明,在水热反应温度80℃、Zn2+/OH-浓度比1∶7.5条件下所得ZnO纳米棒呈花状聚合,直径约为200nm,长度约为2μm,具有六方纤锌矿结构.当甲基橙初始浓度为30 mg.L-1、ZnO纳米棒的投放量为1.5g.L-1时,以300W紫外灯照射150min,甲基橙的降解率可达90%.Flower-like ZnO nanorods were synthesized by hydrothermal method with analytical reagent ZnO as the zinc source, sodium hydroxide as the mineralizing agent, and hydrochloric acid as pH-adjusting agent. The morphology and structure of as-prepared ZnO samples were analyzed by means of scanning electron microscopy and X-ray diffraction. The effects of hydrothermal reaction temperature and ratio of Zn2＋ concentration to OH- concentration on the morphology of the products were investigated. Moreover, the photocatalytic activity of ZnO nano- rods was evaluated with an ultraviolet-visible light spectrophotometer while methyl orange so- lution was used as the target substance of degradation. It has been found that ZnO nanorods obtained at a hydrothermal reaction temperature of 80 ℃ and Zn2＋/OH concentration ratio of 1 ： 7.5 appear as flower-like aggregates with a diameter of about 200 nm and a length of about 2 μm, and they have hexagonal wurtzite structure. Moreover, when the concentration of methyl orange is 30 mg ·L-1 and the dosage of ZnO nanorods is 1.5 g ·L-1 , the methyl orange can be degraded at a rate of over 90% under 150 min of irradiation by 300 W of ultraviolet lamp.

关 键 词：ZNO纳米棒 水热法 合成 光催化性能 

分 类 号：O614.24[理学—无机化学]