Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 494, Issue -, Pages 92-103Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2015.07.049
Keywords
Thin film nanocomposite; Reverse osmosis; Mixed-matrix membranes; Montmorillonite (MMT); Layered double hydroxide (LOH)
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Funding
- National Basic Research Program of China [2015CB655303]
- Research Fund for the Doctoral Program of Higher Education of China [20130101110064]
- National Natural Science Foundation of China [21076176]
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Montmor Ronite (MMT), a cationic clay, and layered double hydroxide (LDH), an anionic clay were prepared through top-down and bottom-up methods, respectively, with lateral dimension on hundred-nanometer scale as well as high aspect ratio. These two types of nanosheets, served as additives in interfacial polymerization process, were utilized to fabricate thin film nanocomposite (TEN) reverse osmosis (RO) membranes containing cationic and anionic clay nanosheets. The properties of TFN membranes were effectively modified with the advantage of unique charged properties and hydrophilic nature of these nanoclay filler materials,. Both MMT and LDH filled TEN membranes showed increased hydrophilicity and improved desalination performance. More importantly, the incorporation of MMT and LDH nanoclays resulted in a more and less negatively charged membrane surface, respectively, and thus exhibited different electrostatic repulsion effects and improved antifouling performances towards protein, cationic surfactant, and natural organic matter foulants. The results indicate that clay nanosheets are effective filler materials to tailor membrane surface properties and fouling resistance. Since the modification by nanoclays can be achieved in the membrane preparation process without altering existing procedures, this approach can be considered as a facile way to produce novel high-performance and fouling-resistant TEN RO membrane for desalination. (C) 2015 Elsevier B.V. All rights reserved.
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