植酸掺杂聚苯胺对重金属铅离子吸附性能的研究

摘要

Absorption of lead ion in water by phytic acid-doped polyaniline,prepared by chemical oxidation polymerization,was investigated.Effects of initial lead ion concentration,pH value and absorption time,on lead ion adsorption capacity were also studied.Thermodynamic adsorption isotherms and adsorption kinetics of lead ion absorption were fitted.Structure of phytic acid-doped polyaniline was characterized by FTIR.The results show that phytie acid-doped polyaniline reaches the maximum lead ion adsorption capacity (121.2 rg/g) at pH value of 5 and approached lead ion absorption equilibrium at 30 rin.Lead ion adsorption capacity increases with increasing initial lead ion concentration and increased slowly when initial lead ion concentration is more than 500 mg/L.The lead ion absorption process fittes well with Langmuirisotherm model and adsorption kinetic studies show that the adsorption accordes with a pseudosecond-order kinetic model.FTIR spectrum indicates that phytic acid-doped polyaniline has the target structure.%采用化学氧化聚合法制备植酸掺杂苯胺共聚物,并将其应用于铅离子水溶液的吸附.研究了铅离子初始浓度、pH值和吸附时间对铅离子吸附性能的影响.对铅离子吸附过程进行了热力学等温线和动力学拟合.采用傅里叶变换红外光谱(FTIR)对植酸掺杂聚苯胺的结构进行了表征.结果表明,pH值=5时植酸掺杂聚苯胺铅离子吸附容量达到最大值(121.2 mg/g),30 min铅离子吸附趋于平衡,植酸掺杂聚苯胺铅离子吸附容量随着铅离子初始浓度的增大呈现不断增大的趋势,当铅离子初始质量浓度大于500 mg/L时,铅离子吸附容量增幅趋缓.植酸掺杂聚苯胺铅离子吸附等温线吻合Langmuir方程,铅离子吸附动力学遵循准二级动力学方程.FTIR结果表明植酸掺杂聚苯胺具有目标结构.