酚醛树脂骨架的8-羟基喹啉螯合树脂吸附性能的研究

Adsorption properties of 8-hydroxyquinoline chelating resin based on phenolic resin skeleton

以1,4-二氯甲氧基丁烷为氯甲基化试剂,对酚醛树脂进行氯甲基化,得到氯甲基化酚醛树脂,再与8-羟基喹啉通过Friedel-Crafts反应制得以酚醛树脂为骨架的8-羟基喹啉螯合树脂。探讨了螯合树脂对不同金属离子的吸附量及吸附选择性;用静态吸附法研究了螯合树脂对Cu2+、Pb2+的吸附符合Freundlich模型;对Cu2+、Pb2+的吸附动力学进行了研究,符合Boyd液膜扩散方程,线性相关性较好。在动态条件下,Cu2+、Pb2+分别在第22个床体积、17个床体积出现穿透;用5mol/L的硝酸进行洗脱,在3个床体积的洗脱率均达到96%以上,说明该树脂具有良好的洗脱性能。

A new chelating resin with phenol formaldehyde resin as skeleton and 8-hydroxyquinoline as functional group was synthesized through the Friedel-Crafts reaction,in which 1,4-bis（chloromethoxy） butane（BCMB）,phenol formaldehyde resin（PF） and 8-hydroxyquinoline are as raw material.The name of the chelating resin is abbreviated as PF-HQ.Adsorption capacity and adsorption selectivity of the PF-HQ chelating resin for different metal ions are studied.The adsorption properties of the PF-HQ chelating resin for Cu2＋ and Pb2＋ ions are studied by the static method.The experimental results show that the adsorption isotherm process accorded with Freundlich models.In addition,the adsorption kinetics of the PF-HQ resin also suggests the accordance with Boyd film diffusion equation.Breakthrough points of Cu2＋ and Pb2＋ on PF-HQ column are 22nd bed volume and 17th bed volume respectively under dynamic condition.It is good to use 5mol/L nitric acid for removing Cu2＋ and Pb2＋ irons.It is found that both the rate of desorption for removing over 96% the Cu2＋ and Pb2＋ ions respectively adsorbed on PF-HQ are 3 bed volumes.The PF-HQ resin has good eluted properties.