摘要
采用溶胶-凝胶法制备了以颗粒活性炭(GAC)为载体的纳米TiO2/AC复合催化剂,并将其用于腐殖酸的光催化降解.动力学研究表明,TiO2/AC光催化降解腐殖酸过程可用Langmuir-Hinshelwood(L-H)动力学模式表示.L-H表观反应速率常数KLH=0.1124mg·L-·1min-1,吸附平衡常数K*=0.3402L·mg-1.活性炭负载TiO2对腐殖酸的光催化降解过程,体现了活性炭与TiO2的协同作用,活性炭的吸附作用提高了光催化反应速率.
A nano-TiO2/aetivated carbon composite photocatalyst was prepared by loading nano-TiO2 on the surfaces of granular activated carbon by a solgel method. The catalyst was then applied to the photocatalytie degradation of humic acid （HA）. The kinetics of HA degradation can be expressed by the Langmuir-Hinshelwood （L-H） equation. The reaction rate constant KLH was 0. 1124 mg·L^-1· min^-1, and the superficial adsorption equilibrium constant K＊ was 0. 3402 L·mg^-1. The photocatalytic degradation of humie acid by the nano-TiO2/aetivated carbon composite photoeatalyst exhibited a synergetic effect. The adsorption of granular activated carbon greatly enhanced the photoeatalysis of humie acid.
出处
《环境科学学报》
CAS
CSCD
北大核心
2009年第9期1923-1931,共9页
Acta Scientiae Circumstantiae
基金
上海市重点学科建设项目(No.B604)~~
关键词
纳米TIO2
腐殖酸
光催化降解
颗粒活性炭
动力学
nano-TiO2
humie acid
photocatalytie degradation
granular activated carbon
kinetics
