| 麦饭石负载壳聚糖对As(V)的吸附性能研究 |
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| 引用本文： | 李爱阳,蔡玲,宋楚华,唐有根.麦饭石负载壳聚糖对As(V)的吸附性能研究[J].化学世界,2008,49(10). |
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| 作者姓名： | 李爱阳 蔡玲 宋楚华 唐有根 |
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| 作者单位： | [1]湖南工学院化工系,湖南衡阳421002 [2]中南大学化学化工学院,湖南长沙410083 |
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| 摘 要： | 利用麦饭石负载壳聚糖制备一种复合吸附剂。研究了复合壳聚糖对As(V)的吸附。结果表明:在pH值为4～7,吸附时间为40min,复合壳聚糖对As(V)的去除率达99%以上,残余As(V)浓度低于国家综合排放标准(0.5mg/L)。通过对实验数据运用相关数学模型拟合,表明复合壳聚糖对As(V)的吸附符合Langmuir和Freundlich吸附等温式,最大吸附量qmax为39.1850mg/g,n为4.7902,相关系数分别为:0.9967、0.9489。吸附过程动力学适合二级动力学方程。
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| 关 键 词： | 麦饭石 壳聚糖 吸附 动力学 |
Study on the Adsorption of As(V) on Medical Stone Loaded with Chitosan |
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| Abstract: | An efficient procedure of loading chitosan on medical stone was established. The adsorption behavior of As(V) on the prepared adsorbent was investigated. The result showed that at pH value of 4~7 and adsorption time of 40 min the removal rate of As(V) reached 99% with the residual concentration of As(V) lower than the national discharge criteria. Fitting the experimental data utilizing the related mathematic models showed the adsorption isotherm corresponds to Langmuir model and Freundlich model, The largest adsorption quality q_ max is 39.1850 mg/g, n is 4.7902, and the r~2 respectively achieves 0.9967 and 0.9489. The adsorption process follows the second-order reaction kinetics. |
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| Keywords: | medical stone chitosan adsorption kinetics |
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