复合功能树脂对水体中天然有机酸的吸附  

Adsorption of Natural Organic Acids Using Bi-function Resin

作　　者：王津南[1,2] 李爱民[1,2] 许丽[1,2] 周扬[1,2] 

机构地区：[1]污染控制与资源化研究国家重点实验室,南京大学环境学院,南京210093 [2]江苏省有机毒物污染控制与资源化工程技术研究中心,南京210038

出　　处：《高等学校化学学报》2009年第5期1046-1051,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:50778088);国家杰出青年科学基金(批准号:50825802);国家“八六三”计划(批准号:2006AA062383)资助

摘　　要：合成了胺基修饰复合功能树脂WJN-07,研究了富里酸、单宁酸和没食子酸在树脂上的吸附行为.与去除DOM的商品树脂XAD-7相比,树脂WJN-07对3种天然有机酸有较高的吸附容量,这是由于新型树脂表面具有修饰的化学官能团和丰富的微孔结构所致.选择单宁酸作为吸附质进行吸附热力学研究,结果表明,树脂WJN-07对单宁酸的吸附为吸热过程,以化学吸附为主导.溶液中重金属离子Pb2+作为影响树脂吸附性能的重要因素在实验中得到证实,其作用机理也得到合理解释.Natural organic acids are widely existed in dissolved natural organic matter （DOM） in environment, which can form THMs in drinking water disinfection. In this paper, a new kind bi-function resin modified by amine function groups was synthesized to remove these acids from water. Comparing with commercial resin XAD-7, the higher adsorption capacities of fulvic, tannic and gallic acids were observed, such advantages had been explained on the basis of chemical function groups of WJN-07. All the isotherm data for resins in adsorption of three acids can be well fitted by the Freundlich equations, and the equilibrium adsorption capacities of tannic acid are obviously higher than fulvic and gallic acids. Furthermore, values of the enthalpy changes show the adsorption of TA on WJN-07 to be a chemical and endothermic adsorption process. Finally, the changes in the amount of three acids adsorbed on the resin WJN-07 as a function of Pb^2 ＋ were studied. The capacity of the resin WJN-07 to adsorb these three acids in the presence of Pb^2＋ is significant higher than in the absence of this metal, such changes owing to the interactions of Pb^2 ＋ with the adsorbed acids and un-adsorbed acids in solution.

关 键 词：复合功能树脂 天然有机酸 吸附 

分 类 号：O631[理学—高分子化学] X132[理学—化学]