羧基修饰的吸附树脂对1,2-苯并异噻唑-3-酮(BIT)的吸附研究

Study on the Adsorption of 1,2-Benzisothiazolin-3-One (BIT) with the Adsorption Resins Modified with Carboxyl

采用偏苯三甲酸酐、均苯四甲酸酐修饰氯甲基化的低交联大孔聚苯乙烯-二乙烯苯制备的超高交联吸附树脂(分别命名为ZT3和ZT4),通过比表面及孔径分析对其结构进行表征。以Amberlite XAD-4树脂作参照,通过等温吸附实验和吸附动力学实验探讨了修饰后的树脂对水溶液中BIT的吸附性能和机理。结果表明:ZT3、ZT4修饰的树脂比Amberlite XAD-4树脂对水溶液中BIT具有更好的吸附效果,这主要归因于树脂的微孔面积、高比表面积和树脂表面的羧基,Langmuir和Freundlich方程均能较好拟合修饰树脂对BIT的吸附等温线。BIT在ZT3和ZT4树脂上的吸附量都是随着溶液pH的增大而减小。

The resins modified with trimellitic anhydride(named ZT3) or pyromellitic dianhydride(named ZT4) during the post-crossing of chloromethyl low crosslinking macroporous poly-styrene resin were prepared and characterized by BET.The adsorption performance of BIT onto ZT3 and ZT4 was studied through static and kinetic adsorption experiment with the commercial Amberlite XAD-4 as a contrast.The results showed that ZT3 and ZT4 resins had better adsorption capability to BIT than that of Amberlite XAD-4.Langmuir and Freundlich isotherm equation can fit the adsorption isotherm of BIT onto ZT3 and ZT4 perfectly.Furthermore,the capacities of ZT3 and ZT4 resins decrease with the increasing pH of solution.