材料期刊网

以谷氨酸-氟硼酸(GluBF4)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[Zn(Ac)2·2H2 O]和NaOH 为原料,室温下制备前驱体,再微波辅助加热制备了微/纳米 ZnO 粉体,获得了单一形貌较高比表面积微/纳米 ZnO 绒球.利用扫描电镜(SEM)、X射线衍射(XRD)、比表面(BET)、能谱(EDS)等对产物进行了结构与性能表征.所得产物为六方晶系纤锌矿结构,绒球直径在1．6~3．0μm 之间,粒径平均尺寸20．4 nm,绒球比表面积为28．3 m2/g,产物纯度高,收率95．6％.该纳米材料在自然光下表现出较高的光催化活性和形态稳定性.分别配制浓度为10 mg/L的100 mL甲基橙(methyl orange,MO)、溴甲酚绿(bromocresol green,BG)水溶液,30 mg纳米ZnO 为光降解催化剂,太阳光激发下5 h 脱色率分别达74．3％和86．4％,重复利用5次,催化剂形貌不变、重量未发生变化.

Micro/nano ZnO with pomponlike shapes has been successfully synthesized by using Zn(Ac)2??2 H2 O and NaOH (1∶6,n/n)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 scanning electron microscopy combined with energy disperse X-ray analysis (SEM-EDS),X-ray powder diffraction (XRD)and the brunauer-emmett-teller (BET)a-nalysis.The product has hexagonal (wurtzite)structure,the diameter of the pomponlike ZnO was approximate-ly 1.6-3.0μm,the particle size of the powder was about 20.4 nm,and the specific surface area of the pompon-like ZnO was 28.3 m2/g,the yield of the product with high purity was about 95.6%.The nano materials ob-tained have high photocatalytic activity and stability under the sunlight.Using 30 mg nano-ZnO as the catalysts for photocatalytic degradation of 100 mL of 10 mg/L methyl orange (MO)and bromocresol green (BG)aqueous solution under the sunlight for 5 h,the decolorization ratios are 74.3% and 86.4%,respectively.The morpholo-gy and weight change of the materials has not been detected yet after reused 5 runs.