Rejection properties of NF membranes for alkylphenols
Rejection properties of NF membranes for alkylphenols
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DOI：
10.1016/j.desal.2005.12.065
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发表时间：
2007-01-05
期刊：
影响因子：
9.9
通讯作者：
Min, Kyung S.
中科院分区：
文献类型：
--
作者：
Jung, Yong J.;Kiso, Y.;Min, Kyung S.
烷基酚（APs），如壬基酚，是众所周知的内分泌干扰化合物（EDCs），在水生环境中已被观察到。在这项工作中，我们重点研究了NF膜对APs的排斥特性。用4种平板型滤膜考察了10种APs（烷基：C2-C9）的截除性能。脱盐效果最好的膜（Memb-1）对4-正辛基酚和4-正壬基酚的脱盐率均在95%以上，但对分子量较低的APs的脱盐率较低。在较低脱盐膜的情况下，APs的排异率随着分子量的增加而线性增加。采用间歇型吸附实验和反相高效液相色谱法研究了APs在膜上的吸附性能。反相高效液相色谱实验以聚酰胺颗粒为固定相，CH3OH/H2O（70/30）为流动相。高效液相色谱法得到的APs容量因子对数（log V）与批量吸附实验得到的分配系数对数（log K）呈线性相关。由于对数k′也与对数P呈线性相关，因此可以说APs在膜聚合物上的吸附性能主要受疏水相互作用的控制。
Alkylphenols (APs), such as nonylphenol, are well-known as endocrine disrupting compounds (EDCs) and have been observed in aquatic environment. In this work, we focused on the rejection proper-ties of NF membranes for APs. The rejection proper-ties for 10 kinds of APs (alkyl group: C2-C9) were examined with four kinds of flat-sheet-type NF membranes. The highest desalting membrane (Memb-1) effectively rejected 4-n-octylphenol and 4-n-nonylphenol at the rate of more than 95%, but the APs with lower molecular weight rejected at the lower degree. In the cases of lower desalting membranes, the rejections of the APs increased linearly with the increase of the molecular weight. The adsorption properties of the APs on the membranes were examined by both batch type adsorption experiments and an inverse HPLC technique. In the inverse HPLC experiments, polyamide particulates were used as the stationary phase and CH3OH/H2O (70/30) was used as the mobile phase. The logarithm of capacity factor (log V) of the APs obtained by HPLC method was linearly correlated with the logarithm of the partition coefficient (log K) obtained by the batch type adsorption experiments. Since the log k'was also correlated linearly with log P, it can be said that the adsorption properties of the APs on the membrane polymer were mainly controlled by the hydrophobic interaction.