| .壳聚糖改性膨润土及其对水中Pb~（2＋）的吸附性能[J].矿业工程研究,2012,27(1):68-74 |
| 壳聚糖改性膨润土及其对水中Pb~（2＋）的吸附性能 |
| Adsorption behaviour of Pb~（2＋） in aqueous solution on bentonite modified by chitosan |
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| DOI： |
| 中文关键词: 壳聚糖;膨润土;吸附;铅离子 |
| 英文关键词: chitosan;bentonite;adsorption;lead ions |
| 基金项目:湖南省自然科学基金资助项目，湘潭市科技计划资助项目 |
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| 中文摘要: |
| 用壳聚糖改性膨润土,制备了一系列不同原料配比的改性膨润土,运用扫描电镜、红外光谱和X-衍射对其结构进行表征,表征结果表明,壳聚糖吸附在膨润土的表面,形成了复合吸附剂.考察了壳聚糖改性膨润土对水中Pb2＋吸附性能,通过单因素影响吸附实验,确定了壳聚糖改性膨润土吸附水中Pb2＋的适宜反应条件.实验结果表明：当Pb2＋初始浓度为20mg/L时,膨润土和壳聚糖质量比为1︰0.01,反应时间为45min,pH值为5.5,吸附剂用量为1g/L,Pb2＋去除率达到90%以上.与膨润土相比,吸附性能得到了很大的提高.运用Langmuir和Freundlich方程对该吸附过程进行拟合,吸附行为符合Langmuir和Freundlich吸附等温式.经多次再生,吸附容量基本不变.通过计算不同温度下各热力学参数△G,△H,△S的值,表明该吸附过程是一个自发的吸热过程. |
| 英文摘要: |
| A series of different molar ratio of bentonite modified by chitosan were prepared from bentonite using chitosan as modified agent.This paper studied the structure of them by means of scanning electron microscopy,infrared spectroscopy and X-ray diffraction.The results showed that the chitosan was adsorbed on the surface of bentonite to form a composite adsorbent.It was applied in treatment of Pb2+ in aqueous solution by a single factor affecting the adsorption experiments to determine the suitable reaction conditions.The results showed that when the initial concentration of Pb2+ is 20 mg/L,with the conditions of bentonite and chitosan quality ratio of 1︰0.01,reaction time was 45 min,pH was 5.5,adsorbent dosage was 1 g/L,the removal rate Pb2+ was over 90%.The removal ratio of using chitosan modified bentonite was higher than bentonite.At the same time,the equilibrium isotherms for adsorption were correlated to the Langmuir equation and Freundlich equation.The saturation adsorption capacity of bentonite modified by chitosan was almost unchanged after regeneration for several times.Through the calculation of the thermodynamic parameters △G,△H,△S values under different temperature,indicated that the adsorption process was a spontaneous endothermic process. |
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