通过聚苯乙烯大孔吸附树脂乙酰化后与二乙烯三胺缩合,制备了一种含二乙烯三胺功能基的多胺型聚苯乙烯吸附树脂Dx-Ta。研究了催化剂、物料比、温度及时间等因素对反应的影响。结果表明:以偏三甲苯为溶剂,TsOH为催化剂,160℃温度下反应25h制得的Dx-Ta树脂的全交换容量为2.18mmol/g,比表面积为211.0m2/g。该树脂对水溶液中Cu2+的吸附速度和容量随温度的升高而提高,静态吸附平衡时间为6h,45℃时平衡吸附量为1.54mmol/g。Dx-Ta树脂对Cu2+的吸附速度、脱附速度和平衡吸附量均高于具有相同修饰基团的胺化聚苯乙烯树脂(PASDA)树脂。比较发现,多胺修饰聚苯乙烯吸附树脂对Cu2+的吸附容量与其全交换容量不成正相关,比表面积和孔容对吸附速度和平衡吸附量有一定影响。
A polyamine-type polystyrene macroporous adsorption resin with diethylenetriamine functional group,Dx-Ta,was prepared from polystyrene macroporous adsorption resin through the acetylation followed by the condensation of diethylenetriamine.The effects of catalyst,material ratio,temperature and time on the reaction were studied.The complete exchange capacity of Dx-Ta prepared by reaction of 25h at 160℃ with 1,2,4-trimethylbenzene as solvent and p-toluene sulfonic acid as catalyst was 2.18mmol/g.The specific surface area was 211.0m2/g.The adsorption rate and capacity of Dx-Ta for Cu2+ in aqueous solution increased with the increase of temperature,the static adsorption equilibrium time was 6 hours,and the equilibrium adsorption capacity was 1.54mmol/g at 45℃.The adsorption rate,desorption rate and equilibrium adsorption capacity of Dx-Ta for Cu2+ were higher than PASDA resin which had the same modification group.It was found that the adsorption capacity of modified polystyrene resin for Cu2+ was not positively correlated with the complete exchange capacity,and the specific surface area and pore volume had some influence on the adsorption rate and equilibrium adsorption capacity.
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基金资助
江苏省前瞻性联合研究项目(BY2016029-18)
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