Positively charged membranes constructed via complexation for chromium removal through micellar-enhanced forward osmosis
作者： Qingchun Ge , Yichen Chen , Xinfei Dong , Wenxiu Hu , Qing-Wei Meng
DOI: 10.1016/J.CEJ.2021.129837
关键词: Betaine 、 Chemistry 、 Forward osmosis 、 Chromium 、 Fouling 、 Chemical engineering 、 Ammonium 、 Membrane 、 Cetylpyridinium chloride 、 Biofouling
摘要: Abstract It is challenging to purify wastewater containing heavy metals at low concentrations. Forward osmosis (FO) promising remove most of contaminants from wastewater. However, the lack suitable membranes disables FO achieve its full potential. Here we designed positively charged PA-Fe-H2O and PA-Fe-Bet for efficient chromium (CrO42-) removal through micellar-enhanced (MEFO) separation. These were developed by functionalizing ready-made polyamine (PA) membrane via eco-friendly complexation between Fe3+ carboxyl groups PA layer and/or betaine (Bet). A Fe3+-bridged hydration or quaternary ammonium was formed which imbued with desirable properties The water permeability increased 92% 142%, respectively, compared that when 0.5 M MgCl2 as draw solution. greatly improved CrO42- efficiency increasing flux 6.2 12.0 LMH along complete retention in cetylpyridinium chloride (CPC) facilitated MEFO process. Moreover, this exhibited enhanced antifouling exposed CPC solutions. environmentally benign synthesis approach, high fouling resistance demonstrate potential removal.
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