一种新型水处理剂合成及其对阴离子污染物的选择性去除

通过键合法合成了一种新型水处理剂—氯甲基聚苯乙烯树脂固载的功能化离子液体〔PS-CH₂-(CH₂)₁₆Im〕，选取Cr(Ⅵ)和甲基橙(MO)为模型阴离子污染物，采用静态与动态柱试验对其选择性去除水中阴离子污染物的性能进行系统研究。结果表明，PS-CH₂-(CH₂)₁₆Im对阴离子污染物选择性吸附性能良好，30 min可达吸附平衡，对Cr(Ⅵ)与MO的静态最大吸附量分别为90.9和62.8 mg/g，可有效去除低至0.004 mg/L的Cr(Ⅵ)。PS-CH₂-(CH₂)₁₆Im易于再生，5次重复使用后吸附性能无显著降低。通过测定缔合常数，明确PS-CH₂-(CH₂)₁₆Im对阴离子污染物的吸附机理为离子缔合作用。

Synthesis of a new water treatment agent and its selective removal of anionic pollutants

A novel water treatment agent, chloromethyl polystyrene resin supported task-specific ionic liquid(PS-CH2-(CH2)16Im) was synthesized by a bonding method. Cr(Ⅵ) and methyl orange (MO) were selected as model anionic pollutants. The performance of selective removal of anionic pollutants in water was systematically investigated by both static and dynamic column tests. The results showed that PS-CH2-(CH2)16Im had good selective adsorption for anionic pollutants. The adsorption equilibrium could be reached in 30 minutes, with static maximum adsorption capacity of 90.9 and 62.8 mg/g for Cr(Ⅵ) and MO, respectively, and also could effectively remove Cr(Ⅵ) at a concentration as low as 0.004 mg/L. PS-CH2-(CH2)16Im was easy to regenerate and recycle at least 5 times without obvious loss in adsorption performance. By measuring the association constant, it was known that the adsorption mechanism of PS-CH2-(CH2)16Im on anionic pollutants was ion association.