Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 573, Issue -, Pages 135-144Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2018.11.072
Keywords
Surface amine functionalization; Forward osmosis; Ammonia selectivity; Anti-fouling capacity; Domestic wastewater concentration
Categories
Funding
- National Key Research and Development Program of China [2016YFC0305400]
- State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [2016DX11]
- National Natural Science Foundation of China [51778172]
- HIT Environment and Ecology Innovation Special Funds [HSCJ201710]
Ask authors/readers for more resources
The inferior selectivity towards ammonia nitrogen (NH4+-N) and severe fouling of the forward osmosis (FO) membrane during the pre-concentration of domestic wastewater (DW) greatly hinder the practical realization of FO-based processes in DW reduction and resource utilization. Herein, surface amine functionalization strategy was, for the first time, adopted to explore the feasibility of fabricating FO membrane with simultaneous ammonia-selective and anti-fouling capacities. Polyethylenimine (PEI), owing to its abundant positively charged primary (-NH3+) and tertiary (-NR3+) amines, was introduced as a protective barrier to impose synergistic interactions of diffusion resistance and electrostatic repulsion to the external NH4+. Benefiting from this, the PEI-grafted membrane exhibited significantly enhanced NH4+-N selectivity with rejection rate of 95.88% over that of 70.36% for the pristine membrane. Besides, the incremental surface hydrophilicity and smoothness as well as the nearly neutral surface potential endowed the PEI-grafted membrane with robust anti-fouling capacity in the concentration of raw DW. Meanwhile, deriving from the reinforced NH4+-N selectivity and the alleviated membrane fouling, the grafted membrane with moderate PEI load possessed a superior NH4+-N removal efficiency of 86.11%. The maximum concentration experiment of DW indicated that the simultaneous ammoniaselective and anti-fouling capacities of the PEI-grafted membrane greatly leaned upon the inhibitions of both the PEI layer incapacitation and the NH4+-N cake-enhanced polarization. The presented strategy on surface amine functionalization enlightened the fabrication of ammonia-selective and anti-fouling FO membrane and significantly facilitated the development of FO-based technologies in resource recovery from DW.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available