ACS SUSTAINABLE CHEMISTRY & ENGINEERING------Designing Multi-functional Coatings for Cost-effectively Sustainable Water Remediation
writer：Xiquan Cheng,+ Zhen Xing Wang,+ Jing Guo, Jun Ma,* and Lu Shao*
keywords：Multi-functional Coatings
source：期刊
specific source：ACS Sustainable Chem. Eng.
Issue time：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.