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太阳光照射下CdS/TiO_2复合纳米粉体的光催化性能
引用本文:赵文霞,白志鹏,任爱玲,郭斌,王鑫杰.太阳光照射下CdS/TiO_2复合纳米粉体的光催化性能[J].精细化工,2009,26(12).
作者姓名:赵文霞  白志鹏  任爱玲  郭斌  王鑫杰
作者单位:1. 南开大学,环境科学与工程学院,天津,300071;河北科技大学,环境科学与工程学院,河北,石家庄,050018
2. 南开大学,环境科学与工程学院,天津,300071
3. 河北科技大学,环境科学与工程学院,河北,石家庄,050018
基金项目:天津市科技发展计划攻关培育项目,河北科技大学大学生科技创新基金 
摘    要:分别采用溶胶-凝胶法和化学沉积法两种方法将CdS修饰在Degussa P25TiO2上,制备得到CdS/TiO2复合纳米粉体,借助XRD、UV-vis漫反射、EDS等手段对其进行表征分析,选择亚甲基蓝(MB)为模型反应物,考察了太阳光照射条件下CdS/TiO2的光催化性能。结果表明,亚甲基蓝溶液初始质量浓度为20mg/L,光催化剂投加量为2g/L时,持续光照60min后,CdS/TiO2对MB的降解率较P25TiO2提高11%~15%;光照120min后,MB降解率最高,达90%以上。阳光照射下CdS/TiO2对MB的光降解反应遵从Langmuir-Hinshelwood模型,动力学结果符合假一级动力学方程,对应的表观反应速率常数是P25TiO2的1.1~1.4倍。用化学沉积法制备的CdS/TiO复合体的光催化活性优于溶胶-凝胶法,与XRD、UV-vis漫反射、EDS等表征结果一致。

关 键 词:太阳光  CdS  纳米TiO_2  光催化活性  亚甲基蓝  水处理技术与环境保护

Photocatalytic Activity of CdS/TiO_2 Composite Nano-powder under Sunlight Irradiation
ZHAO Wen-xia,BAI Zhi-peng,REN Ai-ling,GUO Bin,WANG Xin-jie.Photocatalytic Activity of CdS/TiO_2 Composite Nano-powder under Sunlight Irradiation[J].Fine Chemicals,2009,26(12).
Authors:ZHAO Wen-xia  BAI Zhi-peng  REN Ai-ling  GUO Bin  WANG Xin-jie
Abstract:CdS/TiO_2 composite nano-powder was prepared by cadmium sulfide(CdS)modified Degussa P25 TiO_2 using the two methods of sol-gel method and chemical precipitation method.Their properties were characterized by X-ray diffraction(XRD),UV-vis diffuse reflection absorption spectras and the energy dispersive analysis system of X-ray(EDS).Methylene blue(MB) was selected as the model reactant.The photocatalytic activities of CdS/TiO_2 under sunlight irradiation were also investigated.The results showed that under the condition of initial concentration of MB 20 mg/L,the added amount of photocatalysts 2 g/L and sunlight irradiating 60 min,the photodegradation rate of MB with CdS/TiO_2 composites increased 11%~15%,higher than that with P25 TiO_2;irradiated 120 min,the degradation rate of MB with CdS/TiO_2 composites reached the maximum,more than 90%.The photodegradation reaction of MB with CdS/TiO_2 composites under sunlight,fitted with the Langmuir-Hinshelwood model,the kinetic results followed the pseudo-first-order equation and the apparent reaction rate constant was 1.1~1.4 times as large as that with P25 TiO_2.The photodegradation activities of CdS/TiO_2 composites prepared by chemical precipitation method slightly better than that by the sol-gel method.It was consistent with the characterized results of XRD,UV-vis and EDS.
Keywords:CdS  sunlight  CdS  TiO_2 nanoparticles  photocatalytic activity  methylene blue  water treatment technology and environmental protection
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