Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.
Carbohydr Polym. 2013 Jan 30;92(1):380-7. doi: 10.1016/j.carbpol.2012.09.050. Epub 2012 Oct 2.
A multi-amino adsorbent for arsenic adsorption was reported in this paper. Glycidyl methacrylate (GMA) was first grafted onto the surface of cotton cellulose using ceric ammonium nitrate (CAN) as the initiator, and then the introduced epoxy groups reacted with tetraethylenepentamine (TEPA) to obtain a multi-amino adsorbent. The adsorbent was characterized by FTIR, elemental analysis, (13)C NMR and SEM. Then, the adsorption of arsenic for this adsorbent was investigated. The results showed that the GMA and TEPA were successfully grafted onto the surface of cellulose, and the modification improved the arsenic adsorption performances. Kinetic study suggested that the chemisorptions were the rate-limiting step. Among the three adsorption isotherm models used, Langmuir model fitted the experimental data best. The adsorption capacities of arsenic were less affected by coexisting ions. The adsorbent could be effectively regenerated for four cycles with 0.1 mol/L NaOH solution.
本文报道了一种用于砷吸附的多氨基吸附剂。首先，使用硝酸铈铵（CAN）作为引发剂，将甲基丙烯缩水甘油酯（GMA）接枝到棉纤维素表面，然后引入的环氧基与四乙烯五胺（TEPA）反应，得到多氨基吸附剂。通过傅里叶变换红外光谱（FTIR）、元素分析、（13）C 核磁共振（NMR）和扫描电子显微镜（SEM）对吸附剂进行了表征。然后，研究了该吸附剂对砷的吸附性能。结果表明，GMA 和 TEPA 成功接枝到纤维素表面，修饰提高了砷的吸附性能。动力学研究表明，化学吸附是限速步骤。在所使用的三种吸附等温线模型中，Langmuir 模型拟合实验数据最好。共存离子对砷的吸附容量影响较小。用 0.1 mol/L NaOH 溶液可有效再生吸附剂 4 次。
