脲醛-磺化腐植酸树脂对Cd(Ⅱ)的吸附性

摘要

The effects of modified humic acid on the adsorption and removal of heavy metal ions Cd (Ⅱ) in the water are studied.The humic acid is modified by humic acid,the urea-sulfonated humic acid adsorption resin is prepared by cross-linking curing method,and the structural char-acteristics before and after modification are compared by infrared spectroscopy and specific sur-face area pore size distribution test(BET).The optimum adsorption conditions of Cd (Ⅱ) in the water are determined by orthogonal experiment.The results show that the best adsorption of Cd (Ⅱ) in the water is studied by orthogonal experiment.The adsorption time is 70 min, the dosage of resin 1.1208 g,the pH 6,and the maximum adsorption rate is 99.1%.After the modification,the content of hydroxyl groups decreases,the content of methyl and phenolic hy-droxyl groups increases,the pore size and specific surface area increase and the adsorption ca-pacity of Cd(Ⅱ) is enhanced.%探讨改性腐植酸对水中重金属离子Cd(Ⅱ)的吸附去除作用.对风化煤腐植酸进行磺化改性,采用交联固化法制备脲醛-磺化腐植酸吸附树脂,并利用红外光谱和比表面积及孔径分布测试BET对比其改性前后的结构特征,设计正交试验确定脲醛-磺化腐植酸脂对水中重金属离子Cd(Ⅱ)的最佳吸附条件.结果表明,Cd(Ⅱ)最佳吸附条件为吸附时间70min,树脂投加量为1.1208 g,pH为6,最大吸附率可达99.1%.改性后羟基含量减少,甲基和酚羟基含量增加,孔径和比表面积均增大,增强了Cd(Ⅱ)的吸附能力.