层状液晶模板法制备纳米ZnO及其光催化降解亚甲基蓝的研究

摘要

ZnO nanoparticles were synthesized by homogeneous precipitation method in lamellar lyotropic liquid crystal (LLC) which composed of Sodium dodecyl sulfate (SDS), 1-amyl alcohol (C5 H11 OH) and water.The photocatalytic activity of ZnO nanoparticles under UV-Vis irradiation was evaluated by using the nanoparticles as photocatalyst to degrade methylene blue (MB) dye molecules in aqueous solution.Results indicated that the texture of LLC was the most regular and uniform distribution with SDS:C5 H11 OH was 5:5 when water accounts for 50％.The influence of reaction condition were also investigated and the best photocatalytic performance was obtained by using4 g/L ZnO nanoparticles and 6 g/L H2 O2.Finally, the ZnO photocatalyst was employ for the methylene blue in which the almost 89％ dye molecules removal was achieved after 150 min of UV irradiation time.%以十二烷基硫酸钠、正戊醇、水三元体系制备溶致液晶, 并以此为模板, 结合均匀沉淀法制备纳米ZnO, 并对其在紫外光下的光催化性能进行了研究.结果表明, 当水占50％ (wt, 质量分数), SDS:C5H11OH为5:5 (质量比) 时, 溶致液晶所形成的十字花纹织构最为规整, 且分布十分均匀;考察其在紫外光下的光催化性能, 当纳米ZnO用量为4g/L, 双氧水用量为6g/L时, 光照150min即可使亚甲基蓝溶液的降解率达到89％左右.