Abstract: Micro/nano ZnO with pomponlike shapes has been successfully synthesized by using Zn(Ac)2•2H2O and NaOH (mole ratio 1∶6) as the raw materials and the glutamate fluoboric acid ionic liquid aqueous solution as the reaction medium at the room temperature (25 ℃, 20 min) and then under microwave heating (80 ℃,10 min). The synthesized samples were characterized by field emission scanning electron microscopy combined with energy disperse Xray analysis (SEMEDS), Xray powder diffraction (XRD) and the BrunauerEmmettTeller (BET) analysis. The product had hexagonal (wurtzite) structure, the particle size of the powder was about 20.4 nm, and the specific surface area of the pomponlike ZnO was 27.6 m2/g, with high activity on the photocatalytic degradation of organic pollutants. The photodegradation experiments were conducted on mixed printing and dyeing sewage (500 mL) from drain outlets of Beijing SnowLotus Cashmere Co., Ltd., with ultraviolet light as the light source and 50 mg of micro/nano ZnO pompons as the photodegradation catalyst, giving a photodegradation efficiency of 100% within 30 min. Besides that, the catalyst was reusable. The photodegradation mechanism were also discussed.

Key words: Ionic liquid,    , Single morphology,    , Micro/nano ZnO,    ,  Sewage,    , Photodegradation

摘要： 以自制的谷氨酸 - 氟硼酸( G l u B F 4) 离子液体水溶液为反应介质, 以物质的量比为1∶6的二水合醋酸 锌[ Z n( A c ) 2·2H2O] 和 N a OH为原料, 室温( 2 5℃, 2 0m i n) 制备前驱体, 再微波辅助加热( 8 0℃, 1 0m i n) 制备了纳 米氧化锌粉体, 获得了纳米结构微米尺寸Z n O绒球。利用场发射扫描电子显微镜( F E S EM) 、 X射线衍射( XR D) 、 比 表面积( B E T) 、 能谱( E D S) 等对产物进行了表征。结果表明, 所得产物为六方晶系纤锌矿结构, 粉体粒径2 0. 4n m, 绒 球比表面积为2 7. 6m2/ g。该纳米材料具有较高的光催化降解有机污染物活性。以紫外光为光源, 5 0m g微/纳米 Z n O绒球为光降解催化剂, 取5 0 0mL北京雪莲羊绒股份有限公司排污口混合印染污水进行光降解实验, 在3 0m i n 内光降解效率达到了1 0 0%, 催化剂可回收重复利用, 并对光降解机理进行了初步分析。

关键词: 离子液体, 单一形貌, 微/纳米Z n O绒球, 污水,  , 光催化降解