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Thin film nanocomposite reverse osmosis membrane modified by two dimensional laminar MoS2 with improved desalination performance and fouling-resistant characteristics.

Authors :
Li, Yi
Yang, Shishi
Zhang, Kaisong
Van der Bruggen, Bart
Source :
Desalination. Mar2019, Vol. 454, p48-58. 11p.
Publication Year :
2019

Abstract

Abstract Two dimensional (2 D) layered materials with special properties provide opportunities to design energy-efficient membranes for water desalination. A negatively charged layered graphene analogue, molybdenum disulfide (MoS 2) was synthesized through liquid exfoliation. A novel thin film nanocomposite (TFN) reverse osmosis (RO) membrane was successfully fabricated with prepared laminar MoS 2 as fillers in the organic phase through interfacial polymerization of m -phenylenediamine and trimesoyl chloride monomers. The laminar MoS 2 nanosheets were observed by transmission electron microscopy (TEM), and the nanosheets were dispersed in the polyamide (PA) matrix as well as on the membrane surface. The properties of the resultant TFN membranes were effectively modified by taking the advantage of two dimensional features, i.e., the negative charge and the hydrophilic sites of layered MoS 2. Compared to a classical TFC membrane, the MoS 2 incorporated TFN membranes were found to have an increased salt rejection and higher water flux. Moreover, 0.01 wt% MoS 2 -TFN membrane showed a superior fouling resistance against proteins as foulants. The antifouling behavior of this TFN membrane was observed by field-emission scanning electron microscopy (FE-SEM). Stability tests demonstrated that there was a loss of MoS 2 in the initial 2 h filtration, but the process is stable in the long-term. Graphical abstract Unlabelled Image Highlights • Negatively charged layered MoS 2 was prepared through liquid exfoliation. • Laminar MoS 2 nanosheets were successfully incorporated in the polyamide matrix and modified the membrane surface. • MoS 2 -TFN RO membrane showed decreased selective layer thickness, increased surface hydrophilicity and surface roughness. • MoS 2 -TFN RO membrane exhibited high perm-selectivity and improved fouling resistance. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00119164
Volume :
454
Database :
Academic Search Index
Journal :
Desalination
Publication Type :
Academic Journal
Accession number :
134226573
Full Text :
https://doi.org/10.1016/j.desal.2018.12.016