壳聚糖-CdS复合纳米粒子对甲基橙的光催化降解作用-中国科技论文在线.PDF

中国科技论文在线 16 1 Vol16 N o1 2 0 0 8 2 MATERIALS SCIENCE TECHNOLOGY Feb. , 2008 - CdS 1 1 2 侯 进 , 陈国华, 孟显丽 ( 1. , 266100, E-mai:l houjinqingdao@ 163. com; 2. , 266003) : 用反相微乳液法制备了壳聚糖- CdS复合纳米粒子, 并考察了复合纳米粒子用量光照条件和溶液 pH 值等因素对光催化降解甲基橙的影响. 结果表明: 在 100 mL质量浓度为 20 mg/L 的甲基橙溶液中加入 030 g复合纳米粒子, 可以达到较好的光催化降解效果; 甲基橙在光催化降解过程中最大吸收波长 464 nm 处的吸收峰迅速减弱, 并最终消失, 且在258 nm 和 455 nm 处出现了新的吸收峰, 说明甲基橙发生了降解; 溶 液 pH 值对光催化降解甲基橙有一定的影响, 在弱酸性条件下降解效率较高; 复合纳米粒子比普通 CdS降解 效率高, 2 m in时高出 50%, 400m in 时高出 213%. 初步提出了复合纳米粒子光催化降解机理, 复合纳米粒 子的吸附作用是光催化降解作用的前置步骤. : 反相微乳液; 壳聚糖- CdS复合纳米粒子; 甲基橙; 光催化降解; 降解机理 : O631 : A : 1005- 0299( 2008) 01- 0054- 04 Photocatalytic degradation ofmethylorange by chitosan-supported CdS nanoparticles 1 1 2 HOU Jin , CHEN Guo-hu , MENG Xian-li ( 1 College ofChem istry and Chem icalEngineering, Ocean University of China, Q ingdao 266100, China, E-mai:l houjinqingdao@ 163. com; 2. Chin aOcean University Press, Q ingdao 266003, China) Abstract: To study the effects of some factors such as the amount of composite nanoparticles, different lights and pH values of the solution, et al on the photocatalytic degradation ofmethyl orange, chitosan-supported CdS nanoparticleswere prepared by reverse m icroemulsion reaction. The results showed that the degradation efficiency was excellentwhen the concentrationwas 20mg /L in 100 mL solution containing 030 g composite nan