离子液体对超声法制备硫化锌粒径及光催化性能的影响

以醋酸锌和硫代乙酰胺为原料,分别以水、离子液以及两者的混合液为溶剂,用超声法成功合成了不同粒径的ZnS纳米粒子。用X射线衍射、扫描电子显微镜、红外光谱以及紫外–可见吸收光谱等对所制备样品的晶型、形貌和光学特性进行表征;以紫外光为光源、甲基橙为目标降解物质评价了ZnS纳米粒子的光催化活性。结果表明：离子液体的引入使ZnS纳米粒子的粒径明显变小,带隙能量变大,离子液介质中合成的ZnS纳米粒子具有更高的光催化活性。

Effect of Ionic Liquids on Photocatalytic Performance and Particle Size of ZnS Nanoparticles Prepared by the Ultrasound Irradiating

The nano-particles of ZnS with different sizes were synthesized via a ultrasonic method with zinc acetate dihydrate (Zn(CH 3 COO) 2 ·2H 2 O) and thioacetamide (CH 3 C = SNH 2 ) as starting materials and water, ionic liquids (IL) and aqueous solution of ionic liquids as a solvent. The phase, morphologies and optical properties of the products were investigated by X-ray diffraction, scanning electron microscopy, infrared spectroscopy and UV–Vis technique, respectively. The UV light was used as a light source to investigate the photocatalytic activity of the nano-particles of ZnS for the degradation of methyl orange. The results show that the nano-particles of ZnS become smaller, resulting in the greater band gaps, due to the addition of ionic liquids. The photocatalytic tests indicate that the as-prepared nano-particles in ionic liquids have a high photocatalytic degradation rate for methyl orange under UV light.