期刊
JOURNAL OF MEMBRANE SCIENCE
卷 362, 期 1-2, 页码 192-201出版社
ELSEVIER
DOI: 10.1016/j.memsci.2010.06.032
关键词
Neutrally charged membrane; Polyelectrolyte coating; Nanofiltration; Multivalent ion removal; Antifouling
资金
- WaterCAMPWS, a Science and Technology Center of Advanced Materials for the Purification of Water with Systems under the National Science Foundation [CTS-0120978]
- U S. Department of Energy [DEFG02-91-ER45439]
In this study, a nearly neutrally charged NF membrane was developed by adsorption of a layer of negatively charged sulfonated poly(ether ether ketone) (SPEEK) onto the surface of a positively charged NF membrane It was found that surface charge had a significant influence on multivalent ion rejection and fouling resistance. The neutrally charged membrane could remove multivalent ions (both cations and anions) more efficiently (>95%) than monovalent ions (80%) due to the size effect, a rejection sequence of CaCl2 approximate to MgSO4 approximate to Na2SO4 > NaCl was observed When using bovine serum albumin (BSA), humic acid and sodium alginate as the model foulants, the neutrally charged membrane exhibited much better fouling resistance than both the positively and the negatively charged membranes This result suggests that the foulants would less likely deposit onto a neutral membrane due to the elimination of the charge interaction between the membrane and the foulants In addition, the neutrally charged NF membrane showed better resistance to activated sludge than the commercial NTR-7450 membrane, which suggests this membrane may be applied in an MBR process (C) 2010 Elsevier B.V All rights reserved.
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