Adsorption removal of copper ions from water by the amino-functionalized ceramic membrane
The tannic acid(TA)and iron chloride(FeCl3)were used as coordination monomers to load the TA-Fe 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(Cu2+)from water.The membrane characteristics and removal mechanism of Cu2+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 12.1°.The optimal amino-functionalized 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％Cu2+in the water with the initial Cu2+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.
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