改性甜菜粕基活性炭对Cd^(2+)的吸附研究  

Cd^(2+) Adsorption Property of Modified Activated Carbon Prepared from Beet Pulp

作　　者：武颖杰 周建斌[1] 

机构地区：[1]南京林业大学化学工程学院,江苏南京210037

出　　处：《林产化学与工业》2013年第6期111-115,共5页Chemistry and Industry of Forest Products

基　　金：国家973计划资助(201CB732205)

摘　　要：以生物质甜菜粕为原料,水蒸气为活化剂,用70%的硝酸溶液回流改性制得吸附性能良好的改性甜菜粕基活性炭,采用Boehm滴定和BET比表面积分析对其进行官能团和结构的分析,改性后的活性炭各类含氧官能团均有所增加,总酸度为1.13 nmol/g,比表面积为1 322 m2/g,亚甲基蓝吸附值为195 mg/g,碘吸附值为1 065 mg/g。同时,用该活性炭对溶液中Cd2+进行吸附研究,讨论了不同条件对Cd2+吸附性能的影响,实验结果表明当温度25℃、pH值8.5、吸附时间4 h条件下,向100 mL质量浓度5 mg/L的Cd2+溶液中添加粒度为75~100μm的改性甜菜粕基活性炭1.5 g,对Cd2+有较好的吸附,Cd2+离子去除率可达87%。Beet pulp was used as the raw material for the first time to prepare activated carbon using steam as activating agent and 70 ％ nitric acid solution.The functional group and structure of the carbon were analyzed by Boehm Titration and BET method.The amount of oxygenerated functional group after modifition was increased.The specific surface area of activated carbon is 1 322 m2/g,with methylene blue adsorption value 195 mg/g and iodine adsorption value 1 065 mg/g.The performance of Cd2.＋adsorption using the modified activated carbon was also discussed.The influence of the factors on the adsorption performance,such as temperature,pH,activated carbon particle size,adsorption time and solution initial concentration are investigated.The results showed that the modified beet pulp activated carbon has a good adsorption of Cd2＋ when the temperature is 25 ℃,the pH 8.5,particle size 75-100 μm and amount of 15 g/L.

关 键 词：甜菜粕基活性炭 改性 Cd2+ 吸附 

分 类 号：TQ35[化学工程]