负载型纳米TiO2光催化降解酸性红B的研究  

Loaded Nano-TiO_2 Photocatalyst for Degradation of Acid Red B

作　　者：丁春生[1] 秦树林[2] 缪佳[1] 周如禄[2] 齐霁[3] 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310032 [2]煤炭科学研究总院杭州环境保护研究所,浙江杭州311201 [3]浙江大学机械与能源工程学院,浙江杭州310027

出　　处：《中国给水排水》2008年第15期72-75,81,共5页China Water & Wastewater

摘　　要：为解决传统纳米TiO2光催化氧化工艺催化剂不易分离和载体的比表面积较小、悬浮性差的问题,将纳米TiO2负载在聚丙烯多面球上制备了负载型TiO2光催化剂。利用XRD和氮气吸附法表征了该催化剂的结构特性,并采用其降解酸性红B,考察了初始浓度、曝气量、pH值、H2O2投加量、自由基清除剂及多面球的比表面积等对降解效果的影响。结果表明,偶联剂法制备的TiO2薄膜晶相单一(锐钛矿型),晶体粒度较小,比表面积较大;脱色率会随着酸性红B溶液初始浓度的升高和自由基清除剂(乙醇)的加入而下降,提高溶解氧浓度、增加聚丙烯多面球的比表面积以及酸性条件(pH=3.26时效果最佳)都有利于提高脱色率;投加H2O2也能提高脱色率,但当投加量增至0.5mg/L后效果不再明显;酸性红B的光催化降解遵循一级反应动力学方程。In order to solve the problems of difficult separation of the traditional nano-photocatalysts and small specific surface area and poor suspension property of the normal carriers, the loaded nano- TiO2 photocatalyst was prepared by loading nano-TiO2 on the polypropylene polyhedral sphere. The surface structure properties of this photocatalyst were characterized by the XRD and N2 adsorption method, and it was used to degrade the acid red B. The influences of initial concentration of solution, aeration rate, pH value, H2O2 dosage, free radical scavenger and specific surface area of polyhedral sphere on the degradation efficiency were investigated. The results show that the TiO2 film prepared by adhesive method is monophase anatase with smaller particle size and higher specific surface area. The decoloration efficiency is decreased with the increase of solution initial concentration and the addition of free radical scavenger （ethanol）. However, the increase of DO concentration and specific surface area as well as the acidic condition with pH value of 3.26 are all favorable to improve the decoloration efficiency. Although the addition of H2O2 is also good for decoloration, the efficiency is not remarkable when the dosage is increased to more than 0.5 mg/L. In addition, the photocatalytic degradation of the acid red B follows the first-order reaction kinetic equation.

关 键 词：负载型纳米二氧化钛 光催化 酸性红B 

分 类 号：X703[环境科学与工程—环境工程]