Facile Synthesis of Phytic Acid Impregnated Polyaniline for Enhanced U(VI) Adsorption
Facile Synthesis of Phytic Acid Impregnated Polyaniline for Enhanced U(VI) Adsorption
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轻松合成植酸浸渍聚苯胺以增强 U(VI) 吸附
DOI：
10.1021/acs.jced.8b00688
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发表时间：
2018-10-01
期刊：
影响因子：
--
通讯作者：
Zou, Hao
中科院分区：
文献类型：
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作者：
Lei, Hao;Pan, Ning;Zou, Hao
采用原位聚合和超分子自组装的方法合成了一种新型植酸浸渍聚苯胺（PA-PANI），并将其作为吸附剂用于水溶液中U（VI）的高效捕集。对吸附剂的结构和形貌进行了表征。通过静态吸附实验研究了pH值、离子强度、接触时间、U（VI）初始浓度和温度等因素对PA-PANI-3吸附U（VI）的影响。结果表明，PA-PANI-3对U（VI）的吸附容量为86.6 mg/g，大大超过了聚苯胺（PANI，8.8 mg/g）。吸附过程符合准二级动力学和Langmuir等温模型，理论最大吸附量为90.3mg/g。根据Dubininin-Radushkevich等温模型方程的计算结果，认为吸附主要是化学吸附机理。U（VI）通过磷酸、胺和亚胺基团吸附在PA-PANI-3上。PA-PANI-3吸附U（VI）后，用0.1mol/LNa_2CO_3溶液解吸U（VI），解吸率为90.8%。研究表明PA-PANI可作为一种有效的吸附剂用于从水溶液中去除和回收U（VI）。
A novel phytic acid impregnated polyaniline (PA-PANI) was synthesized by a in situ polymerization and supermolecular self-assembly method and has been used as an adsorbent for efficient capture of U(VI) from aqueous solution. The structure and morphology of the adsorbent were well characterized. The influence of different factors such as pH value, ionic strength, contact time, initial U(VI) concentration and temperature on the adsorption of U(VI) onto PA-PANI-3 were carried out by batch adsorption experiments. The results demonstrated an enhanced U(VI) adsorption capacity of 86.6 mg/g for PA-PANI-3, greatly exceeding that of polyaniline (PANI, 8.8 mg/g). The adsorption process follows the pseudo-second order kinetic and Langmuir isotherm models with the theoretical maximum adsorption capacity of 90.3 mg/g. According to the calculation from the Dubinin-Radushkevich isotherm model equation, it is suggested that the adsorption is mainly a chemical adsorption mechanism. U(VI) is adsorbed on PA-PANI-3 via the phosphoric acid, amine, and imine groups. The U(VI) can be desorbed from the U(VI) adsorbed PA-PANI-3 with a desorption efficiency of 90.8% by using 0.1 mol/L Na2CO3 solution. This study demonstrated that PA-PANI could be used as an efficient adsorbent for removal and recovery of U(VI) from aqueous solution.