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ACS SUSTAINABLE CHEMISTRY & ENGINEERING------Designing Multi-functional Coatings for Cost-effectively Sustainable Water Remediation
作者:Xiquan Cheng,+ Zhen Xing Wang,+ Jing Guo, Jun Ma,* and Lu Shao*
关键字:Multi-functional Coatings
论文来源:期刊
具体来源:ACS Sustainable Chem. Eng.
发表时间:2017年

Multi-functional coatings derived from bio-inspired dopamine (DA) engage

lots of attention for water environmental remediation recently. Nevertheless,

high cost of DA monomers seriously hampers their broad applications. Herein, an

elegant multi-functional coating which could be deployed as selective adsorbents

or loose nanofiltration membranes for removing of dyes and antibiotics from

water, were designed based on the Michael-addition and Schiff-base reactions

between cost-effective plant-derived gallic acid (GA) and branched polyethyleneimine

(PEI) under room temperature. Aside from the extremely low cost of GA (about 5%

of DA), the resultant GA/PEI coatings possessed much better performance than

DA/PEI coatings. When deployed as dye adsorbent, the bio-inspired GA/PEI coatings

exhibited much higher selectivity, showing 40 % increment in anionic dye adsorptive

capability and 30% decline in cationic dye adsorptive capability compared with

DA/PEI coatings. When applied for nanofiltration membrane to separate

antibiotics solution, the multi-functional coatings demonstrated solution flux

as high as 41.3 L m-2 h-1 at 5 bar alongside 96.2 %

azithromycin (AH) rejection, showing 20 % increment in flux and 10 % increment

in rejection compared with DA/PEI nanofiltration membranes. Therefore, our cost-effective

multi-functional GA/PEI coatings show promising applications for sustainable

water remediation.