通过对比几种常用的离子交换树脂,筛选出处理Cl O-4的最佳树脂。研究表明:氯型717阴离子交换树脂(Cl717)表现出较好的吸附效果,其吸附动力学符合伪二级动力学模型,吸附等温线符合Langmuir吸附等温式,属于单层吸附;升高温度和增加投加量有利于Cl717对ClO_4-的吸附;共存阴离子对Cl717吸附ClO_4-产生抑制作用,干扰能力依次为Cl-〈NO3〈SO4^2-〈PO4^3-。对树脂进行了再生,再生液浓度为2.16mol/L,当用量为树脂体积5倍时可获得较好的再生效果。红外光谱分析结果表明:C1717吸附ClO4-的主要机理可能是树脂骨架对ClO4-的静电引力作用以及ClO4-与树脂的季胺基团形成了氢键。
Several commonly used ion exchange resins were compared and the optimal resins to absorb perchlorate were screened out. It showed that Cl717 anion exchange resin acquired the best adsorption efficiency. The adsorption process attributed to the pseudo second order kinetics model, and the equilibrium isotherm for perchlorate uptake corresponded closely to the Langmuir model,belonging to the adsorption type of single layer.The increase of temperature and dosage was beneficial to the adsorption. Co-existed anions could affect the adsorption process with the interference order of Cl^-NO_3^-SO_4^(2-)PO_4^(3-). The best regeneration efficiency was obtained when the concentration of regenerated solution was 2. 16 mol/L and the amount of regenerated solution was5 times of the resin volume. The FTIR analysis revealed that the mechanism of resin absorbing perchlorate was probably the attraction of resin skeleton electrostatic and the formation of hydrogen bond between perchlorate and resin quaternary amine groups.