大孔吸附树脂去除饮用水中酚类环境激素的效能

Effectiveness of Macroporous Adsorption Resin for the Removal of Phenolic Environmental Hormones in Drinking Water

为研究大孔吸附树脂对饮用水中酚类环境激素的去除作用,以间甲酚、2,4-二氯苯酚和2,4,6-三氯苯酚为研究对象,以吸附容量为评价指标,筛选出吸附效果最佳的LX-T28型大孔吸附树脂。利用动力学模型研究了3种酚类环境激素在LX-T28上的吸附性能,吸附动力学结果表明,3种酚类环境激素在LX-T28上的吸附过程属于快速吸附类型,准二级动力学模型可较好地拟合试验数据。该研究对影响大孔吸附树脂去除酚类环境激素的各项参数进行了优化,确定的最佳工艺条件为:酚类化合物浓度为5μg/mL的模拟水样300 BV(树脂床体积)在pH=7.24和温度35℃时,以6 BV/h流速吸附,9 BV的95%乙醇以4 BV/h的流速解吸附,此时模拟水样中间甲酚、2,4-二氯苯酚和2,4,6-三氯苯酚的去除率分别为76.9%、88.1%和89.7%。

The effectiveness of macroporous adsorption resin for the removal of phenolic environmental hormones in drinking water was investigated.Three environmental hormones,namely m-cresol,2,4-dichlorophenol and 2,4,6-trichlorophenol were chosen as the adsorbates,and the LX-T28 macroporous resin with the largest adsorption capacity was selected.Adsorption properties of three phenolic environmental hormones on LX-T28 were systematically explored by kinetic models.The results of adsorption kinetics indicated that the adsorption process of three phenolic environmental hormones on LX-T28 belonged to the quick adsorption type,and pseudo-second-order kinetic model could fit the experimental data well.The parameters which affected the removal efficiency of phenolic environmental hormones were optimized,and the optimum process conditions were obtained as follows:sample volume of 300 BV(bed volume)with phenolic compounds concentration of 5μg/mL,pH of 7.24,temperature of 35℃,flow velocity of 6 BV/h,and 95%ethanol volume of 9 BV with desorption flow velocity of 4 BV/h.Under the optimal conditions,the removal efficiencies of m-cresol,2,4-dichlorophenol and 2,4,6-trichlorophenol were 76.9%,88.1%and 89.7%,respectively.