在微波辅助下,以聚丙烯腈纤维(PANF)为基体材料,二乙烯三胺(DETA)和硫化钠为改性试剂,通过两步接枝反应快速制备了含有大量硫原子的螯合纤维吸附剂.利用傅里叶变换红外光谱仪(FT-IR)和热重分析仪(TGA)对改性前后的纤维进行表征,同时考察了pH值、初始浓度、吸附时间和温度对螯合纤维吸附汞离子的影响.结果表明,微波辅助是一种高效、节能、经济和绿色的改性方法,改性过程在无毒的水环境中进行,试剂用量少,且改性时间大大缩短.改性纤维对汞离子的吸附是一个准二级动力学过程,较好的符合Langmuir吸附模型.在pH =7的条件下,螯合纤维对汞离子的最大吸附容量达到333.1 mg/g,是一种有效的去除水中汞污染的吸附材料.
A chelating fiber which contains large amount of sulfur atoms was prepared through two step reactions by microwave assisted method using polyacrylonitrile fibers (PANF) as the matrix and diethylenetriamine (DETA) and sodium sulphide as functional agents.The influence of pH,the initial concentration of metal ion,adsorption time and temperature were investigated thoroughly.The results show that microwave assisted method exhibits a highly efficient,energy saving,economic and eco-friendly way for the preparation of chelating fibers.The modification processes were performed in nontoxic water environment and the consumed amount of reaction agents were reduced remarkably,along with significantly decreased functionalization time.The pseudo-second-order model and Langmuir isotherm model were found to provide the best fit to the experiment data for the adsorption process of mercury.The obtained chelating fiber shows high affinity towards mercury with the maximum adsorption capacity of 333.1 mg/g at pH =7,in dicating its potential for the removal of mercury from aqueous solution.
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