氨基化陶瓷膜对水中铜离子的吸附去除性能

Adsorption removal of copper ions from water by the amino-functionalized ceramic membrane

以单宁酸(TA)和氯化铁(FeCl_(3))为配位单体,在陶瓷中空纤维膜基底表面负载TA-Fe中间层,进而通过聚乙烯亚胺(PEI)和戊二醛(GA)交联形成多氨基功能层,制备出能有效去除水中Cu^(2+)离子的吸附膜材料,探究了吸附膜材料结构特征及其对Cu^(2+)离子的吸附效能和机制。结果表明,TA-Fe中间层能明显提升陶瓷基底表面多氨基功能层稳定性,促进PEI与GA间交联反应,有助于形成更为均一光滑的多氨基功能层,膜材料表面接触角仅为12.1°。多氨基功能层最佳制备参数为5%GA溶液中浸泡90 s后,再浸泡于2%PEI溶液中反应60 s,在Cu^(2+)离子质量浓度为1~100 mg·L^(−1)内,所制备吸附膜材料均能获得>90%的去除率。Langmuir模型能够更好地拟合Cu^(2+)吸附去除过程,表明膜材料对Cu^(2+)离子的吸附去除主要通过化学吸附作用,且最大吸附容量达到124.2 mg·m^(−2)。在处理腐殖酸模拟料液与市政污水料液时,膜材料均表现出优异的运行稳定性与重复利用性。

The tannic acid(TA)and iron chloride(FeCl_(3))were used as coordination monomers to load the TAFe middle layer on the surface of ceramic hollow fiber membrane,and subsequently a thin amino-functionalized layer was formed through the cross-linking reaction between polyethyleneimine(PEI)and glutaraldehyde(GA).The adsorption membrane was prepared for the effective removal of copper ions(Cu^(2+))from water.The membrane characteristics and removal mechanism of Cu^(2+)were systematically investigated.The result showed that TA-Fe middle layer could significantly increase the stability of amino-functionalized layer on the ceramic substrate,promote the cross-linking reaction between PEI and GA,facilitate the formation of uniform and smooth amino-functionalized layer,the contact angle value of membrane surface was 12.1o.The optimal aminofunctionalized layer could be prepared by immersing into 5%GA solution for 90 s and subsequently immersing into 2%PEI solution for 60 s.The membrane could remove higher than 90%Cu^(2+)in the water with the initial Cu^(2+)mass concentration ranging from 1 to 100 mg·L^(−1).The experimental date could be better fitted by the Langmuir isotherm mode,indicating that the adsorption process was controlled by the chemosorption.The maximum adsorption capacity could reach 124.2 mg·m^(−2).Additionally,the membrane exhibited the excellent stability and reusability when treating the feed solution containing humic acid and municipal wastewater.