文章摘要
壳聚糖对Pb2+吸附性能研究
Studies on adsorption performance of Pb2+ions onto Chitosan
  
DOI:
中文关键词: 壳聚糖  Pb2+  吸附等温线  吸附热力学  吸附动力学
英文关键词: chitosan  Pb2+ ions  adsorption isotherm  adsorption thermodynamics  adsorption kinetics
基金项目:国家自然科学基金资助项目(20976040);湖南省自然科学基金资助项目(13JJ3086)
作者单位
欧阳振中1,白珊1,曾坚贤2,阿伊姆古丽·热合曼2,陈红2,肖靖2 1.长沙环境保护职业技术学院湖南 长沙 4100042. 湖南科技大学 化学化工学院湖南 湘潭 411201 
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中文摘要:
      以壳聚糖为吸附剂,考察溶液pH值、Pb2+初始浓度等条件对壳聚糖吸附性能的影响,研究不同温度下壳聚糖对Pb2+的吸附等温线、热力学和动力学行为,并研究表观活化能.结果表明,当pH为5~6时,壳聚糖对Pb2+的吸附能力达到最大值;随着Pb2+初始浓度增加,平衡吸附量随之增加并达到最大值,此后基本不变;当温度在298~313 K变化时,平衡吸附量随Pb2+平衡浓度增大而增大,达到最大值后基本不变,吸附行为符合Langmuir方程;不同温度下的△G均小于零,且温度越高,△G越小,△H大于零,温度越高越有利于吸附;随着吸附时间延长,初始阶段吸附速率较快,此后逐渐下降,吸附动力学行为符合拟二级速率模型,吸附表观活化能为18.658 kJ/mol.
英文摘要:
      Effects of pH value and the initial concentration of Pb2+ions on the adsorption performance were investigated by using the chitosan as an adsorbent. Then, the isotherm, thermodynamics and kinetics were studied for the adsorption of Pb2+ions onto chitosan at the different temperatures. Further, the apparent activation energy was calculated. Results indicated that, the adsorption capacity of Pb2+ ions onto chitosan reach a maximum value in pH range 5~6. With increasing the initial concentration of Pb2+ions, the equilibrium capacity increase, then reach a maximum value, and finally do not change. When temperature are change in the range of 298~313 K, the equilibrium capacity increase with the equilibrium concentration of Pb2+ions and then do not change any more, and the Langmuir equation fit perfectly to the experimental datum. △G is less than zero at the different temperatures, and decrease with increasing temperature. △H is greater than zero, which indicate that the higher the temperature is, the easier the adsorption is. With increasing the adsorption time, the adsorption rate increase rapidly at the initial stage and then decrease gradually, and the adsorption kinetics follow the pseudo-second rate equation. The apparent activation energy is 18.658 kJ/mol.
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