竹活性炭负载二氧化钛光催化降解水溶液中甲醛的研究  

Removal of formaldehyde from aqueous solutions using TiO_2 immobilized on bamboo activated carbon

作　　者：崔丹丹[1] 蒋剑春[1] 孙康[1] 卢辛成[1] 

机构地区：[1]中国林业科学研究院林产化学工业研究所生物质化学利用国家工程实验室国家林业局林产化学工程重点开放性实验室江苏省生物质能源与材料重点实验室,江苏南京210042

出　　处：《功能材料》2011年第B06期438-441,共4页Journal of Functional Materials

基　　金：林业公益性行业专项资助项目(201004051);国家科技支撑资助项目(2009BADB1B03);中央级公益性科研院所基本科研业务费专项资金资助项目(CAFINT2009K02)

摘　　要：采用竹活性炭作为载体,通过溶胶-凝胶法制备二氧化钛/竹活性炭复合光催化剂,并考察其对水溶液中甲醛的去除效果。分别考察了预吸附时间、催化剂投加量、初始反应浓度等对去除效果的影响,结果表明预吸附1h,催化剂投加量为1g时,初始浓度为5mg/L甲醛溶液在17W紫外灯照射480min时,去除率达95.96%。同时,对制备所得的复合光催化剂去除水溶液中甲醛的动力学进行了初步研究,结果表明二氧化钛/竹活性炭复合光催化剂去除水溶液中甲醛的反应符合朗格缪尔-欣伍(Langmuir-Hinshelwood)动力学方程,为一级反应。A A composite of TiO2 and bamboo actlvatea carbon was achieved through sol-gel method and its removal of formaldehyde was evaluated. Removal rate of formaldehyde with different preadsorbing time, initial concentrations and different catalyst dosages over the composite was investigated. It was shown that the prepared composite photocatalyst remove formaldehyde from aqueous solution distinctly： when the dosage is 1. 0g, 800mL initial concentration of 5mg/L aqueous solution o{ formaldehyde, after lh pre-adsorbing and then expo- sure in 17W UV-light, the formaldehyde removal rate is up to 95.96% at 480min. The kinetic analysis showed that photocatalytic rates were well described by the Langmuir-Hinshelwood model. The apparent first-order re- action coefficient of photocatalysis with low concentration is higher than that with high concentration formalde- hyde. More composite showed higher reaction coefficient than the less one in certain extent, and too much composite hindered the photocatalysis owing to the lower light transmittance.

关 键 词：竹活性炭 二氧化钛 甲醛 动力学 

分 类 号：TQ424[化学工程] O632.2[理学—高分子化学]