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Title: Designing a biocidal reverse osmosis membrane coating: Synthesis and biofouling properties

In this study, a biocidal coating was developed in order to reduce biofouling on a reverse osmosis (RO) membrane using a quaternary ammonium (QA) functionalized polymer. The synthesis of a series of polysulfone (PS) ionomers with QA groups is described, and a method for spraying these QA ionomers as an alcoholic solution, which dried into water insoluble coatings. Contact angle and streaming potential were used to analyze the coating's hydrophilicity and surface charge. Both PS-QA1 and the commercial RO membrane had an apparent contact angle of 68° that increased to 126° for PS-QA12 corresponding to alkyl chain length. A negatively charged particle-probe was used to measure coated and uncoated RO membrane interaction forces. Measured interaction forces correlated strongly with the length of alkyl chains or hydrophobicity of the coated surfaces. Uncoated RO membranes and ones coated with PS-QA were exposed to suspensions of Escherichia coli cells. All four PS-QA coatings showed significant biotoxicity and killed 100% of the E. coli cells, but uncoated RO membranes had metabolically active biofilms. However, coatings tested in a RO crossflow system showed a flux reduction that is attributed to mass transfer resistance due to excessively thick films.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [3] ;  [4]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Univ. of Alberta, Edmonton, AB (Canada)
  3. Yale Univ., New Haven, CT (United States)
  4. Univ. of Nebraska, Lincoln, NE (United States)
Publication Date:
OSTI Identifier:
1248614
Report Number(s):
SAND--2015-10785J
Journal ID: ISSN 0011-9164; PII: S0011916415301193
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Desalination
Additional Journal Information:
Journal Volume: 380; Journal Issue: C; Journal ID: ISSN 0011-9164
Publisher:
Elsevier
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY reverse osmosis membrane; biofouling; antibacterial activity; polycation coating; quaternary ammonium ionomer