Synthesis of micro/nano ZnO with pomponlike shapes and its photocatalytic activity in organic dyes degradation
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.
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