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林产化学与工业 ›› 2013, Vol. 33 ›› Issue (6): 111-115.doi: 10.3969/j.issn.0253-2417.2013.06.021

• 1研究报告 • 上一篇    下一篇

改性甜菜粕基活性炭对Cd2+的吸附研究

武颖杰, 周建斌   

  1. 南京林业大学 化学工程学院, 江苏 南京 210037
  • 收稿日期:2012-12-14 修回日期:1900-01-01 出版日期:2013-12-30 发布日期:2013-12-30
  • 通讯作者: 周建斌,教授,博士生导师,从事生物质能源与活性炭材料的研究;E-mail:zhoujianbin@njfu.com.cn。

Cd2+Adsorption Property of Modified Activated Carbon Prepared from Beet Pulp

WU Ying-jie, ZHOU Jian-bin   

  1. College of Chemical Engineering,Nanjing Forestry University, Nanjing 210037, China
  • Received:2012-12-14 Revised:1900-01-01 Online:2013-12-30 Published:2013-12-30

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75~100 μm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%。

关键词: 甜菜粕基活性炭, 改性, Cd2+, 吸附

Abstract: 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.

Key words: beet pulp activated carbon, modifition, Cd2+, adsorption

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