氨基修饰超高交联树脂对单宁酸的吸附行为及机理研究  

ADSORPTION OF TANNIC ACID BY HYPER-CROSSLINKED RESIN MODIFIED BY AMINO FUNCTION GROUPS

作　　者：王津南[1,2] 周扬[1,2] 李爱民[1,2] 许丽[1,2] 许玲[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：《高分子学报》2010年第1期96-101,共6页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号50778088);国家杰出青年科学基金(基金号50825802);国家高技术研究发展计划(863计划;编号2006AA06Z383)资助项目

摘　　要：选用单宁酸作为天然有机酸中典型中分子、高水溶性有机酸,系统研究了氨基修饰超高交联树脂对单宁酸的吸附行为和机理.吸附等温线表明氨基修饰超高交联树脂WJN-08对单宁酸有较高的吸附容量,其静态饱和吸附量比传统商业吸附剂高15%以上;吸附表面分析表明离子键、π-π共轭作用和阳离子-π键是重要吸附作用力;吸附热力学试验表明树脂WJN-08吸附单宁酸是化学吸附主导,吸附焓变在2022 kJ mol-1;吸附动力学试验表明树脂WJN-08吸附单宁酸速率同时受控于颗粒内扩散和膜扩散过程.动态小柱吸附-脱附实验表明树脂WJN-08对单宁酸有较好的吸附-脱附性能,饱和吸附量和穿透吸附量分别为24.43 mg g-1和19.56 mg g-1,脱附率为98.6%。Tannic acid（TA） as a typical natural organic acid of high solubility and medium molecular weight,was used to study the adsorption act and mechanism on a new hyper-crosslinked resin modified by amino function groups WJN-08.The adsorption isotherm data indicates that the equllibrium adsorption capacity of WJN-08 for TA is 15% higher than that of other commercial adsorbents.Moreover,the static adsorption assay indicates that the adsorption capacity for TA is related to the pore structure and the amounts of amino function groups of resin.The FTIR spectra of WJN-08 before and after adsorption of TA indicate that both ＂π-π＂ conjugation and electric attraction are the adsorption force during the adsorption process.The adsorption enthalpy changes ΔH of TA by WJN-08 is in a range from 20 to 22 kJ mol-1,which exhibit the adsorption is a chemical and endothermic process.Batch kinetic studies indicate that the adsorption of TA on WJN-08 can be fitted by the membrane and intra-particle diffusion model.In particular,excellent adsorption and de-sorption performance of WJN-08 for TA is shown in dynamic column assay.The break though adsorption capacity is 19.56 mg g-1 and saturation adsorption capacity is 22.43 mg g-1,respectivey,and the desorption rate of TA on WJN-08 is more than 98%.

关 键 词：氨基修饰超高交联树脂 单宁酸 吸附行为 机理 

分 类 号：O647.31[理学—物理化学]