乙二胺树脂对铜和磺胺甲恶唑的吸附特性与机制  

THE COREMOVAL PROPERTIES AND MECHANISMS OF Cu(Ⅱ) AND SULFAMETHOXAZOLE ONTO A SYNTHESIZED ETHYLENEDIAMINE RESIN

作　　者：仇欢[1,2] 凌晨[1] 刘福强[1] 王风贺[2] QIU Huan LING Chen LIU Fuqiang WANG Fenghe(State Key Laboratory of Pollution Control and Resource School of the Environment, Nanjing University, Nanjing 210046, China School of the Environment, Nanjing Normal University, Nanjing 210046, China)

机构地区：[1]污染控制与资源化国家重点实验室,南京大学环境学院,南京210046 [2]南京师范大学环境学院,南京210046

出　　处：《离子交换与吸附》2016年第6期481-492,共12页Ion Exchange and Adsorption

基　　金：国家自然科学基金项目51378253资助

摘　　要：系统研究了乙二胺树脂（PsA）对铜Cu（Ⅱ）和磺胺甲恶唑（SMZ）污染物的共去除性能及交互影响规律。研究结果表明，PSA对Cu（Ⅱ）和SMZ的吸附等温线可采用Langmuir方程进行拟合，共存不同浓度SMZ时，Cu（Ⅱ）的饱和吸附量升高（18．11～32．9％）；共存不同浓度Cu（H）时，SMZ的饱和吸附量降低（2．18～36．5％）。结合预负载、动态吸附实验及固相FT-IR分析，低SMZ浓度时，Cu（Ⅱ）的增强去除主要是由于质子化氨基被阴离子SMZ。吸附，屏蔽了正电荷对Cu（Ⅱ）的静电排斥作用。Cu（Ⅱ）与SMZ分别与PSA中的氨基发生配位作用和静电／氢键作用，因而存在竞争吸附，且Cu（Ⅱ）的吸附作用力更强；固相中Cu（Ⅱ）对SMZ具有架桥吸附作用，形成了-N-Cu（Ⅱ）-SMZ三元络合物构型。用1．0mol／L的HCl对吸附后的PSA进行再生，SMZ和Cu（Ⅱ）的再生率分别达98．2％和99．8％。共存无机盐显著促进了Cu（Ⅱ）的吸附（4．7-42．7％），略抑制了SMZ的吸附（1．6-19．4％），而共存腐植酸对两种目标污染物的去除基本无影响。The coremoval properties of copper and sulfamethoxazole onto a synthesized ethylenediamine resin （PSA） were investigated. The adsorption isotherm of both Cu（Ⅱ） and SMZ could be well fitted by Langmuir model. The maximum capacity of Cu（Ⅱ） increased by the range from 18.11% to 32.9% with SMZ coexistent, while SMZ uptake was suppressed by the range from 2.18% to 36.5% when Cu（Ⅱ） was coexistent. The preloading tests, dynamic adsorption studies, and FT-IR characterizations demonstrated that the enhanced removal of Cu（Ⅱ） can be attributed to the protonated amino group adsorbed on SMZ in the lower concentration of SMZ, which shielded the electrostatic attraction between Cu（Ⅱ） and amino group. Surface amine groups participated in the adsorption of both Cu（Ⅱ） and SMZ by coordination and hydrogen bonding/electrostatic interaction, respectively, which resulted to the competitive suppression effect, but Cu（Ⅱ） was preferred with a higher affinity. Moreover, the adsorbed Cu（Ⅱ） bridged for SMZ adsorption as the new site, forming the ternarycomplex [resin-Cu（Ⅱ）-SMZ]. Finally, 98.2% SMZ and 99.8% Cu（Ⅱ） could be recovered by 1.0mol/L HCl. The coexistence of inorganic salts markedly promoted the adsorption of Cu（Ⅱ） by the range from 4.7% to 42.7%, but slightly inhibited the adsorption of SMZ by the range from 1.6% to 19.4%, and the amount ofhumic acid had no effect on the adsorption of PSA.

关 键 词：乙二胺树脂 铜 磺胺甲恶唑 吸附 机制 

分 类 号：O647.3[理学—物理化学]