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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 2H2O]和氢氧化钠为原料,室温下制备前驱体,再微波辅助加热制备了纳米氧化锌粉体,获得了纳米结构微米尺寸纳米Zn O绒球.利用场发射扫描电镜(FESEM)、X射线衍射(XRD)、比表面(BET)、能量色散谱(EDS)等对产物进行了表征.所得产物为六方晶系纤锌矿结构,粉体粒径20.4 nm,绒球比表面积为28.3 m2g–1,产物纯度较高,收率95.3%.同时探讨了纳米Zn O绒球生成的可能机理.该纳米材料在日光下显示较高的光催化活性和稳定性.分别配制浓度为10 mg L–1的100 m L甲基橙(MO)和甲基紫(MV)水溶液,30 mg纳米氧化锌为光催化降解催化剂,太阳光激发下5 h脱色率分别达到74.3%和96.9%;溶液总有机碳(TOC)含量随光降解的进行缓慢下降;光催化剂重复利用5次,催化剂形貌不变、颜色不变,质量基本未发生变化.
An aqueous solution of glutamic acid borofluoride (GluBF4) ionic liquid was used as the reaction medium to prepare a precursor of zinc acetate [Zn (Ac) 2 2H2O] and sodium hydroxide in a molar ratio of 1: 6 at room temperature , And then nano-zinc oxide powder was prepared by microwave-assisted heating to obtain nano-structured nanometer Zn O pomponites. The structure of the nano-sized Zn O pomponites was characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), BET, (EDS), etc. The product was hexagonal wurtzite structure with the particle size of 20.4 nm and the poultice sphere surface area of 28.3 m2 g-1, the purity of the product was high and the yield was 95.3%. The possible mechanism of the formation of nanometer Zn O pompons was obtained.The nanomaterials showed high photocatalytic activity and stability under sunlight.Mail methyl orange (MO) and methyl (MV) aqueous solution and 30 mg of nano-ZnO as photocatalytic degradation catalyst, the decolorization rates reached 74.3% and 96.9% at 5 h under solar excitation respectively. The content of total organic carbon (TOC) in solution decreased slowly with photodegradation. Reuse of catalyst 5 times, the catalyst morphology unchanged, the same color, the quality of the basic unchanged.