RuO_2/La_2O_3/TiO_2悬浮体系中直接耐晒黑G的光催化降解  

Photocatalytic degradation of direct fast black G by RuO_2/La_2O_3/TiO_2 suspension

作　　者：姚秉华[1] 王理明[1] 杨国农[1] 周孝德[1] 赵高扬[1] 郑怀礼[2] 

机构地区：[1]西安理工大学应用化学系,西安710048 [2]重庆大学化学化工学院,重庆400044

出　　处：《环境污染治理技术与设备》2005年第4期18-21,共4页Techniques and Equipment for Environmental Pollution Control

基　　金：国家自然科学基金资助项目 (50072018 );陕西省教育厅科学研究基金资助项目(02JK141)

摘　　要：钛酸丁酯为前驱体,采用溶胶凝胶浸渍法制备RuO2 /La2O3 /TiO2 复合光催化剂,以紫外灯为光源,研究了催化剂组成、煅烧温度、溶液pH值等因素对直接耐晒黑G(DFBG)光催化降解的影响。结果表明:掺杂量w(La2O3 )1 .39%、w(RuO2 )0 .12%、煅烧温度500℃(2h)、溶液pH值7. 3时,光催化活性最佳。当通气量为200mL/min,催化剂投加量为150mg时, 50mg/L的DFBG溶液经60min降解,其降解率近100%。DFBG的光催化降解服从Langmuir Hinshelwood动力学模型,测得相应的动力学参数k=7 .42×10-3 mmol/L·min,K=19 54L/mmol。RuO_2/La_2O_3/TiO_2 coupled photocatalyst was prepared by the sol-gel-immersion process with Ti(OC_4H_9)_4 as a precursor.The photocatalytic degradation of direct fast black G (DFBG) in RuO_2/La_2O_3/TiO_2 powder suspension under UV irradiation was investigated. As results, the addition of RuO_2 and La_2O_3 to TiO_2 greatly enhanced its photocatalytic activity. When w(RuO_2)=0.12%,w(La_2O_3)=1.39%, calcined at 500 ℃ for 2 h, the DFBG dye was almost completely degraded in 60 min in the solution of the pH 7.3 with the air flow rate 200 mL/min and the addition of coupled photocatalyst 150 mg. The results demonstrated that the photocatalytic degradation of DFBG follows the Langmuir-Hinshelwood kinetic model, and the kinetic constants k and K values were determined to be 7.42×10 -3 mmol/L·min and 19.54 L/mmol,respectively.

关 键 词：光催化降解 LA2O3 TiO2 RUO2 直接耐晒黑G 悬浮体系 溶胶-凝胶-浸渍法 LANGMUIR 溶液PH值 复合光催化剂 煅烧温度 催化剂组成 光催化活性 动力学模型 动力学参数 钛酸丁酯 min 前驱体 紫外灯 掺杂量 500 通气量 投加量 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学]