典型酚类内分泌干扰物的活性炭吸附行为

Adsorption behavior of representative phenolic endocrine disrupting chemicals on activated carbons

在静态吸附实验中,考察了水中六种酚类内分泌干扰物(EDCs)在两种粉末活性炭(WP和WPN)上的吸附行为。结果表明,六种EDCs在活性炭上的吸附过程均为假二级动力学吸附,其中壬基酚(4-n-NP)在WP和WPN上表现出最高的吸附能力,平衡吸附量(qe)分别达到了6 535.95μmol.g-1与7 246.38μmol.g-1,其次是雌激素酮(E1),吸附能力最差的是雌二醇(E2),qe值仅为1 636.66μmol.g-1与1 801.80μmol.g-1。进一步研究结果表明,初始浓度相同时,目标物在活性炭上的吸附能力与其正辛醇/水分配系数(logKOW)正相关,并且改性炭WPN对六种EDCs表现出相对更高的平衡吸附量,较原炭WP的平衡吸附量提高了2.5%～63.6%,因此,在活性炭实际应用前可通过一定改性处理方法提高其对水中该类污染物的净化能力。

Aqueous adsorption behavior of six phenolic endocrine disrupting chemicals（EDCs） on two powdered activated carbons（WP and WPN） was investigated through static adsorption experiment.The results indicated that the adsorption processes of all six EDCs agreed well with the pseudo-second-order kinetic model.The adsorption capacity of nonylphenol on WP and WPN was the highest,with equilibrium adsorption amount（qe） 6 535.95 μmol·g-1 and 7 246.38 μmol·g-1,respectively,followed by estrone.The adsorption capacity of estradiol was the poorest,which reached 1 636.66 μmol·g-1 and 1 801.80 μmol·g-1 on WP and WPN,respectively.Furthermore,the adsorption capacities of target compounds had a positive correlation with their octanol/water distribution coefficient as their initial aqueous concentration was equal.And,the modified carbon sample WPN showed better adsorption capacity.Compared with that on the original sample WP,the qe of six EDCs was increased by 2.5%~63.6% on WPN.Thus,purification ability of activated carbon could be improved by some certain modification treatment when used to treat such like compounds in practice.