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金属矿山 ›› 2009, Vol. 39 ›› Issue (11): 139-142.

• 安全与环保 • 上一篇    下一篇

用高锰酸钾改性提高竹炭对Cu2+ 的吸附能力

马子川, 赵梅青,吴银素,刘敬泽   

  1. 河北师范大学
  • 出版日期:2009-11-16 发布日期:2011-04-26
  • 基金资助:

    河北省自然科学基金项目(编号:B2009000183),河北师范大学重点科研基金项目(编号:L2008Z05)。

Cu2+ Adsorption Improvement of Bamboo Charcoal with KMnO4

Ma Zichuan,Zhao Meiqing,Wu Yinsu,Liu Jingze   

  1. Hebei Normal University
  • Online:2009-11-16 Published:2011-04-26

摘要: 采用KMnO4溶液在回流状态下对竹炭进行改性,得到改性竹炭。比较研究了 KMnO4浓度对Cu2+ 在竹炭上的吸附率-pH曲线的影响,并研究了KMnO4改性对竹炭吸附和解吸Cu2+ 性能的影响。静态吸附试验表明, KMnO4 改性使竹炭对Cu2+ 吸附率-pH曲线及pH50向低pH偏移,当 KMnO4溶液浓度为0.04 mol/L时,改性效果最好; KMnO4 改性使其投加量节省约2倍; 竹炭对Cu2+ 的吸附均遵循Langmuir单分子层吸附规律, 在相同Cu2+ 平衡浓度下,改性后的竹炭对Cu2+ 的吸附量提高约53%,升高温度能明显提高改性竹炭对Cu2+ 的吸附能力,40 ℃的饱和吸附量是25 ℃的1.69倍。KMnO4 改性提高了竹炭从水中吸附重金属离子的能力,并改善了其解吸再生性能。

关键词: 高锰酸钾, 改性, 竹炭, 吸附, Cu2+

Abstract: Bamboo charcoal (BC) was treated with KMnO4 solution under refluxing condition to prepare the new modified bamboo charcoal.The influence of KMnO4concentration on the Cu2+ adsorption rate-pH curves and pH50 was investigated.The modification with KMnO4 affected the adsorption and desorption capacity of bamboo charcoal to Cu2+.The results show that the Cu2+ adsorption rate-pH curves and pH50 of bamboo charcoal move to low pH after modification with KMnO4.The best result achieved at 0.04 mol/L KMnO4.The modification with KMnO4 improves the adsorption rate of Cu2+ and reduces the consumption of adsorbent about threefold than that of unmodified bamboo charcoal.The adsorption isothermals of Cu2+ over the modified and unmodified bamboo charcoal match to Langmuir monolayer adsorption.On the same condition of equilibrium concentration of Cu2+, the adsorption amount of Cu2+ over bamboo charcoal modified with KMnO4 increases about 53% than that of the unmodified bamboo charcoal.Moreover, the Cu2+ adsorption capacity of the modified bamboo charcoal can be improved obviously with the increase of temperature.At 40 ℃, the saturated adsorption amount of Cu2+ is 169% as much as that of at 25 ℃.The modification of bamboo charcoal with KMnO4 not only increases the adsorption capability of bamboo charcoal to heavy metal ions, but also improves the ability of desorption-regeneration of bamboo charcoal.

Key words: KMnO4, Modification, Bamboo charcoal, Adsorption, Cu2+