萘和苯并[b]荧蒽在配位聚合物上的选择性吸附行为和机理研究

Selective Adsorption Behavior and Mechanism of Naphthalene and Benzo[b] fluoranthene onto Coordination Polymer from Aqueous Solutions

异烟酸铜配位聚合物是由[Cu（4-C5H4N-COO）2（H2O）4]n通过分子间氢键构筑而成的三维超分子化合物,选用分子形状、大小和疏水性差别较大的多环芳烃萘和苯并[b]荧蒽为研究对象,研究异烟酸铜配位聚合物对它们的选择性吸附作用.结果表明,在pH为5-6,吸附剂用量为1.0 g/L时,异烟酸铜配位聚合物对苯并[b]荧蒽的去除率可达90%以上,而对萘的去除率低于10%.萘和苯并[b]荧蒽在异烟酸铜配位聚合物上的吸附等温线既较好地符合Langmuir模式,又较好地符合Freundlich模式.热力学数据表明,异烟酸铜配位聚合物吸附苯并[b]荧蒽的过程是自发进行的,而对萘的吸附则是非自发过程.动力学试验表明,2种物质的吸附过程均为一级可逆动力学反应.

The selective sorption of polycyclic aromatic hydrocarbons （PAHs） onto a copper （Ⅱ） isonicotinate [Cu（4-C5 H4 N-COO）2 （H2O）4 In coordination polymer, a three-dimensional supramolecular compound built by intermolecular hydrogen bond, was studied. Naphthalene （NA） and benzo[b]fluoranthene （BbF） were selected as model analytes because of their distinct differences of shape, size and hydrophobicity. BbF was removed by the developed adsorbent up to 90% ; however, the removal of NA was under 10% at pH 5-6 with an adsorbent dose of 1.0 g/L. The results obtained on the adsorption of NA and BbF were analyzed by the Langmuir and Freundlich models. The adsorption of BbF on the copper（ Ⅱ ） isonicotinate polymer was spontaneous, whereas the adsorption of NA on it was non-spontaneous. Adsorption of NA and BbF in aqueous systems follows reversible first-order kinetics.