| 磁性壳聚糖衍生物对阴离子染料的吸附行为 |
| 摘要点击 2242 全文点击 1093 投稿时间：2014-05-20 修订日期：2014-07-27 |
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| 中文关键词 壳聚糖衍生物 磁性 阴离子染料 吸附 活性炭 |
| 英文关键词 chitosan derivatives magnetic anionic dyes adsorption activated carbon |
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| 中文摘要 |
| 以自制的阳离子磁性壳聚糖季铵盐(CS/EPTAC/Fe3O4)为吸附剂,采用静态法研究了其对酸性红1、二甲酚橙的吸附行为. 结果表明,在25℃,pH=3.0的条件下,两种酸性染料的吸附等温线由Langmiur方程拟合的吸附量分别为781.55 mg·g-1和537.40 mg·g-1; 由Frendlich方程得到的n值分别为1.71和1.92,说明染料吸附为优惠吸附; Temkin方程说明吸附剂的非均匀表面为主要吸附位. 两种染料的吸附动力学符合拟二级动力学模型,说明吸附过程以化学吸附为主. 与粉末活性炭相比,CS/EPTAC/Fe3O4体现出吸附性能优良,快速分离和容易再生的优点. |
| 英文摘要 |
| Adsorption of acid red 1(AR1) and xylenol orange(XO) onto magnetic quaternary chitosan particles were studied through the static adsorption method. The results showed that, the maximal adsorption capacities calculated by Langmuir equations were 781.55 mg·g-1 for AR1, 537.40 mg·g-1 for XO at pH 3.0 and 25℃. The constant n obtained by Frendlich equations were 1.71 and 1.92 respectively, which reflected the favourable adsorption of the dyes onto CS/EPTAC/Fe3O4.Temkin equations showed that heterogeneous surface of adsorbent was the main adsorption point. The adsorption kinetics of two kinds of dyes followed the pseudo-second-order model, which indicated the process was mainly chemical adsorption. Compared with the powder activated carbon, CS/EPTAC/Fe3O4 showed advantages of excellent adsorption performance, rapid separation and easy regeneration. |
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