复合功能树脂NXD-2对水中邻苯二甲酸单丁酯的去除性能

Removal of mono-n-butyl phthalate in aqueous phase by bifunctional polymeric adsorbent NXD-2

酞酸单酯是水体环境中一类新型的环境激素污染物。以含叔胺基的复合功能树脂NXD-2为吸附剂，以邻苯二甲酸单丁酯（MBP）为目标污染物，通过吸附等温线、热力学、动力学和柱吸附脱附实验，考察了NXD-2对MBP的吸附性能。研究结果表明，NXD-2对MBP的吸附以氢键作用为主，在288-313K的温度范围内，平衡吸附量随温度的升高而升高；升高温度有利于加快NXD-2对MBP的去除速率。柱吸附脱附研究表明，在进水浓度为300mg·L-1的高浓度条件下，吸附出水的前100BV中，溶液中MBP的浓度低于检测限（10μg·L-1），说明NXD-2对MBP具有较高的处理深度；同时NXD-2具有较好的脱附效果，脱附体积达到20BV时，脱附率接近100％。因此，复合功能树脂NXD-2作为一种吸附剂，在水体中酞酸单酯的去除方面具有良好的应用前景。

A new emerging hormone pollutants in aquatic environment, phthalic acid monoesters can lead to potential human health and ecological risks. In the present study, the adsorption performance of NXD-2 （a hydrophilic bifunctional polymeric resin with tertiary amine groups） for mono-n-butyl phthalate （MBP） was studied by means of isotherms, thermodynamics, kinetics and dynamic column adsorption-desorption experiments. An analysis for sorption isotherms and thermodynamics showed that the adsorption of NXD-2 for MBP relied mainly on contribution of hydrogen bonding. The equilibrium adsorption capacities and adsorption rates increased with the increasing temperature in the range of 288-313 K. The results of continuous column adsorption demonstrated that at the condition of inflow with high concentration of MBP 300 mg . L-1, the removal efficiency of NXD-2 could make the MBP content in effluent lower the detection limit （10 μg . L-I） for first 100BV of effluent. Furthermore, NXD-2 was of good desorption performance, adsorbed MBP could be completely desorbed when adsorption volume reached 20BV. These results showed that NXD-2 could be an effective sorbent for the removal of phthalic acid monoesters in aqueous solution.