| 阳离子聚合物改性膨润土对六价铬的吸附特性研究 |
| 摘要点击 2845 全文点击 2799 投稿时间：2008-04-24 修订日期：2008-08-06 |
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| 中文关键词 阳离子聚合物/膨润土 Cr(Ⅵ) 吸附动力学 吸附热力学 |
| 英文关键词 bentonite modified by cationic polymers Cr(Ⅵ) adsorption kinetics adsorption thermodynamics |
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| 中文摘要 |
| 采用阳离子聚合物聚环氧氯丙烷二甲铵（EPI DMA）和聚二甲基二烯丙基氯化铵（PDMDAAC）分别对钠基膨润土进行了改性，研究了改性膨润土吸附Cr(Ⅵ)的主要影响因素.结果表明，膨润土经阳离子聚合物改性处理后，吸附Cr(Ⅵ)的能力提高了5倍以上.改性膨润土所使用的阳离子聚合物量、阳离子聚合物/膨润土的投加量、溶液pH值、温度、振荡时间影响其对Cr(Ⅵ)的吸附行为.阳离子聚合物负载量分别为99.6 mg/g的EPI DMA/Bt和55.1 mg/g的PDMDAAC/Bt，在20℃、pH=4.0的溶液中，投加量为10 g/L反应120 min时，对Cr(Ⅵ)的吸附量分别为0.71 mg/g和0.56 mg/g.EPI DMA/Bt和PDMDAAC/Bt对Cr(Ⅵ)的吸附符合伪二级动力学方程和Langmuir等温吸附模式. |
| 英文摘要 |
| Two cationic polymer epicholorohydrin dimethylamine (EPI-DMA) and poly dimethyldlammonium (PDMDAAC) as the intercalary reagents were used to prepare a series of bentonites (EPI-DMA/Bt and PDMDAAC/Bt) modified by the cationic polymers, respectively. The adsorption of Cr(Ⅵ) on cationic polymer/bentonite and major influencing factors were studied. The results show that the sorption capacity of Cr (VI) is increased more than five times compared with the original one. The load of cationic polymers in bentonites, the dosing quantity of EPI DMA/Bt and PDMDAAC/Bt, the solution pH, temperature (T), time of reaction (t) affect the adsorption. When T=20℃, pH=4.0, t=120 min, EPI DMA/Bt (the load of cationic polymer is 99.6 mg/g) and PDMDAAC/Bt (the load of cationic polymer is 55.1 mg/g) adsorb 0.71 mg/g and 0.56 mg/g Cr(Ⅵ), respectively. The adsorption kinetics are fitted well by pseudo second order equation. The adsorption isotherms of cationic polymer/bentonites to Cr(Ⅵ) are fitted well by the Langmuir equation. |
