Wang Shuojue, Ma Hui-Ling, Peng Jing, Zhang Youwei, Chen Jian, Wang Liangliang, Xu Ling, Li Jiuqiang, Zhai Maolin
Beijing National Laboratory for Molecular Sciences, Radiochemistry and Radiation Chemistry Key Laboratory of Fundamental Science, the Key Laboratory of Polymer Chemistry and Physics of the Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Dalton Trans. 2015 Apr 28;44(16):7618-25. doi: 10.1039/c5dt00101c.
A novel polymeric ionic liquid gel (PIL gel) was simply synthesized by γ-radiation-induced polymerization of ionic liquid monomer 1-allyl-3-vinylimidazolium chloride and crosslinking at ambient temperature without any additives. By changing the radiation dose, the properties of the resulting gel including the gel fraction, crosslinking density and equilibrium degree of swelling were optimized. The resulting PIL gel exhibited a superior adsorption ability toward Cr(vi) in aqueous solutions with a broad pH range (1-7) through anion exchange. It was found that the adsorption kinetics followed the pseudo-second-order model. The adsorption of Cr(vi) by the PIL gel obeyed the Langmuir isotherm equation with a theoretical maximum adsorption capacity of 283 mg g(-1), twice the highest value for ionic liquid-based adsorbents that have been reported. In addition, the PIL gel could be recovered using a NaCl solution or a NaOH solution without much decreasing the adsorption capacity. This work paves the way for the scale-up production of PIL gels using the radiation technique for potential application in heavy metal removal.
通过γ辐射引发离子液体单体1-烯丙基-3-乙烯基咪唑鎓氯化物的聚合反应，并在室温下交联，无需任何添加剂，即可简单地合成一种新型的聚合离子液体凝胶（PIL凝胶）。通过改变辐射剂量，对所得凝胶的性能进行了优化，包括凝胶分数、交联密度和平衡溶胀度。所得的PIL凝胶通过阴离子交换对水溶液中的Cr(VI)具有优异的吸附能力，其pH范围较宽（1-7）。研究发现，吸附动力学遵循准二级模型。PIL凝胶对Cr(VI)的吸附符合朗缪尔等温方程，理论最大吸附容量为283 mg g(-1)，是已报道的基于离子液体的吸附剂最高值的两倍。此外，使用NaCl溶液或NaOH溶液可以回收PIL凝胶，而吸附容量不会大幅降低。这项工作为利用辐射技术大规模生产PIL凝胶以用于重金属去除的潜在应用铺平了道路。
