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Cho, Jaeweon
OWIELAB(Organic-Water Interface Engineering Laboratory)
Research Interests
  • Convergence of Science and Arts, Feces Standard Money (FSM), Water & Energy

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Intrinsic pKa of Nanofiltration Membrane Surfaces to Assess Fouling and Cleaning Behaviors Induced by Foulant-Membrane Electrostatic Interactions

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dc.contributor.author Rho, Hojung ko
dc.contributor.author Cho, Jaeweon ko
dc.contributor.author Westerhoff, Paul ko
dc.contributor.author Chon, Kangmin ko
dc.date.available 2020-07-30T07:51:48Z -
dc.date.created 2020-07-23 ko
dc.date.issued 2020-06 ko
dc.identifier.citation ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.54, no.12, pp.7706 - 7714 ko
dc.identifier.issn 0013-936X ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/47388 -
dc.description.abstract The fouling and cleaning behaviors of m-phenylenediamine (MPD), coumarin-3-carboxylic acid (CCA), and D-(+)-glucose (DG) on polyamide nanofiltration (NF) membrane surfaces were investigated with a focus on the two intrinsic equilibrium constants (pK(a,intr)) of carboxylic and amine functional groups determined using potentiometric titration. The charged foulants (MPD and CCA) strongly influenced the pK(a,intr) of the membrane surface after the fouling layer formed via electrostatic interactions (Virgin = 3.4 and 9.2; MPD-fouled = 4.1 and 8.1; CCA-fouled = 1.5 and 12.4). Moreover, the pK(a,intr) of electrostatically fouled membranes substantially recovered when using cleaning agents that released electrostatic interactions (cleaned MPD-fouled = 3.5 and 9.0; cleaned CCA-fouled = 3.3 and 9.6). In contrast, the neutral foulant (DG) did not affect the pK(a,intr). (DG-fouled = 3.5 and 9.2); however, the zeta-potential of DG-fouled membrane was closer to zero than the virgin membrane (Virgin = -28.1 mV and DG-fouled = -7.2 mV at pH 7). The pK(a,intr) value accurately represented the electrostatic interactions between organic foulants and membrane surfaces. Potentiometric titration is a facile method of determining the pK(a,intr) that gives an in-depth understanding of the electrostatic interactions at the membrane surface associated with the membrane fouling and cleaning mechanism. ko
dc.language 영어 ko
dc.publisher AMER CHEMICAL SOC ko
dc.title Intrinsic pKa of Nanofiltration Membrane Surfaces to Assess Fouling and Cleaning Behaviors Induced by Foulant-Membrane Electrostatic Interactions ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-85086523313 ko
dc.identifier.wosid 000542229600069 ko
dc.type.rims ART ko
dc.identifier.doi 10.1021/acs.est.0c01846 ko
dc.identifier.url https://pubs.acs.org/doi/10.1021/acs.est.0c01846 ko
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