pH响应型聚丙烯腈-丙烯酰胺-丙烯酸多孔水凝胶的制备及其在环境污染方面的应用

Preparation of pH sensitive poly(acrylonitrile-acrylamide-acrylic acid) hydrogel and its application in enviromental pollution

Pb2+离子是一种重要的污染源,因此有效的移走不仅是对环境更是对人类健康具有重要意义。我们利用pH响应型聚丙烯腈-丙烯酰胺-丙烯酸多孔水凝胶作为吸附剂来移走Pb2+离子。探讨了时间、pH和温度对吸附能力的影响。结果表明在pH为5,温度为25℃时,有最大的吸附能力,达到了1.578mg。更为有趣的是可以通过改变pH来改变聚合物链相变的办法实现水凝胶的重复利用。

Pb^2＋ ions pose a significant threat to the environment and public health. Removal and reuse of Pb^2＋ ions from the environment are major focuses of waste treatment. In this study, experimental measurements have been made on the batch adsorption of Pb^2＋ ions from aqueous solutions using a highly porous poly（acrylonitrile-acrylamide-acrylic acid） hydrogel. The influences of uptake conditions, such as contact time, pH and temperature on the metal ion binding capacity of hydrogel,were tested. Results showed the applicability of such hydrogel to Pb2＋ ions by optimizing the suitable pH and temperature. At the conditions of initial pHS, 25℃, 1. 578mg Pb^2＋ ions was removed by per unit hydrogel mass. The re- moval of Pb2＋ ions was realised by low pH.