聚丙烯酸-聚偏氟乙烯树脂对Cu(Ⅱ)的吸附性能

Adsorption behavior of Cu(Ⅱ) ion by the polyacrylic acid-polyvinylidene fluoride blending resin

采用溶液热诱导聚合和相转移共混新技术,制备了聚丙烯酸-聚偏氟乙烯(PAA-PVDF)微球树脂,研究了该树脂对水溶液中Cu2+的吸附性能,吸附热力学及吸附动力学.模型拟合结果表明,PAA-PVDF树脂对Cu2+具有优良的吸附性能,吸附量随温度升高而增大.热力学参数△G0<0、△H0>0、△S0>0,证实了该树脂对Cu2+的吸附为自发的吸热过程.PAA-PVDF树脂对Cu2+的等温吸附较好地符合Freundlich等温吸附模型,D-R等温吸附表明该吸附过程为离子交换反应.该吸附过程的动力学符合准二级动力学方程.PAA-PVDF树脂的吸附/脱附性能优良,经吸附/脱附4次循环后,其吸附量>5mg/g,脱附率仍超过95%.

Using the combination method of thermally induced polymerization technique and phase inversion and blending process, the polyacrylic acid-polyvinylidene fluoride blending resin （PAA-PVDF） was prepared. The adsorption property, the adsorption isotherm and the batch sorption kinetics of Cu^2＋ by the blending resin were studied. The results of simulation indicated that the PAA-PVDF resin possessed an excellent adsorption property of Cu^2＋, and the adsorption capacity of the resin increased with the increasing of temperature. △G^0〈0,△H^0〉0,and △S^0〉0 showed that the adsorption of Cu^2＋ by the blending resin was a spontaneous and endothermic process. The isotherm of adsorption of Cu^2＋ by the PAA-PVDF resin was good consistent with Freundlich isotherm model. The results of D-R adsorption isotherm showed that the adsorption mechanism was ion exchange between Cu^2＋ and the carboxylic acid functional group of the PAA-PVDF resin. And its batch sorption kinetics accorded with the pseudo-second-order kinetics model. The PAA-PVDF resin possessed an excellent adsorption/desorption property, the adsorption capacity of the resin was more than 5mg/g, and its desorption efficiency was beyond 95%, after four adsorption/desorption processes.