Liu Bingjie, Chen Wei, Peng Xiaoning, Cao Qiqi, Wang Qianrui, Wang Dongfeng, Meng Xianghong, Yu Guangli
College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China.
College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China.
Int J Biol Macromol. 2016 May;86:562-9. doi: 10.1016/j.ijbiomac.2016.01.100. Epub 2016 Feb 2.
In this paper, the bio-based ion-imprinted tetraethylenepentamine (TEPA) modified chitosan beads using Pb(II) as imprinted ions (Pb-ITMCB) were chemically synthesized, characterized and applied to selectively adsorb Pb(II) ions from aqueous solutions containing other metal ions, which has the same concentration as that of Pb(II) ions. Batch adsorption experiments were performed to evaluate the adsorption conditions, selectivity and reusability. FTIR, SEM and TEM technologies were used to elucidate the mechanism of Pb-ITMCB adsorbing Pb(II) ions. The results showed that the adsorption capacity of Pb-ITMCB for Pb(II) ions reached 259.68 mg/g at pH 6, 40 °C. The adsorption data could be fitted well with pseudo-second order kinetics model and Langmuir isotherm model. Compared with other metal cations, Pb(II) ions showed an overall affinity of being adsorbed by Pb-ITMCB. With the participation of active groups including NH2, NH and OH, the adsorption reaction took place both inside and on the surface of Pb-ITMCB. It indicated that Pb-ITMCB is a comparatively promising biosorbent for selective removal of Pb(II) ions from aqueous solutions.
本文通过化学合成法制备了以铅离子（Pb(II)）为印迹离子的生物基离子印迹四乙烯五胺（TEPA）修饰壳聚糖微球（Pb-ITMCB），对其进行了表征，并将其应用于从含有与Pb(II)离子浓度相同的其他金属离子的水溶液中选择性吸附Pb(II)离子。进行了批量吸附实验以评估吸附条件、选择性和可重复使用性。采用傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）技术来阐明Pb-ITMCB吸附Pb(II)离子的机理。结果表明，在pH为6、温度为40℃时，Pb-ITMCB对Pb(II)离子的吸附容量达到259.68 mg/g。吸附数据能很好地拟合准二级动力学模型和朗缪尔等温线模型。与其他金属阳离子相比，Pb(II)离子表现出被Pb-ITMCB吸附的总体亲和力。在包括NH2、NH和OH的活性基团参与下，吸附反应在Pb-ITMCB的内部和表面同时发生。这表明Pb-ITMCB是一种从水溶液中选择性去除Pb(II)离子的较有前景的生物吸附剂。
