Study of adsorption performance and adsorption mechanism for U(VI) ion on modified polyacrylonitrile fibers
Study of adsorption performance and adsorption mechanism for U(VI) ion on modified polyacrylonitrile fibers
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DOI：
10.1007/s10967-019-06928-5
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发表时间：
2019-11
影响因子：
1.6
通讯作者：
Fan Wang;Xinglei Wang;Yunjie Jiang;Zhiwei Niu;Wang-suo Wu;Hongxia Zhang
中科院分区：
文献类型：
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作者：
Fan Wang;Xinglei Wang;Yunjie Jiang;Zhiwei Niu;Wang-suo Wu;Hongxia Zhang
采用肟化反应和碱水解法合成了改性聚丙烯腈纤维。采用SEM、FTIR、XPS和元素分析等手段对ACPAN纤维进行了表征。研究了接触时间、固液比、pH值、离子强度、初始浓度和温度等因素对ACPAN纤维吸附U（VI）的影响，并对吸附机理进行了探讨。实验数据较好地拟合了准二级动力学模型、Freundlich模型和D-R模型，热力学过程为吸热自发反应。最大吸附容量为163 mg/g，U（VI）与ACPAN纤维可能形成更稳定的五配位络合物。本文强调ACPAN纤维是一种良好的吸附剂，可以高效、经济地去除放射性废水中的铀酰。
The modified polyacrylonitrile fibers (ACPAN fibers) was synthesized by oximation reaction and alkaline hydrolysis. ACPAN fibers was characterized by means of SEM, FTIR, XPS and elementary analysis. The effects of contact time, solid–liquid ratio, pH, ionic strength, initial concentration and temperature on U(VI) adsorption onto ACPAN fibers was studied and the adsorption mechanism was also discussed. The experimental data fitted well pseudo-second-order kinetics model and Freundlich and D–R models, and thermodynamic process was an endothermic and spontaneous reaction. The maximum adsorption capacity was 163 mg/g, and U(VI) and ACPAN fibers possible formed more stable penta-coordination complexation. This paper highlighted ACPAN fibers as a good adsorbent to remove efficiently and economically uranyl from radioactive wastewater.