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        Organic Dye Solution Nanofiltration by 2D Zn-TCPP(Fe) Membrane – leverage of chemical and fluid dynamic effects

        Xianting Lei,Siok Wei Tay,Pin Jin Ong,Liang Hong 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-

        This study investigates organic solvent nanofiltration (OSN) using the membranes composed of 2D Zn-TCPP(Fe) nanosheets. A group of organic dyes with different molecular weights, hydrophilic propertiesand functional groups was selected as probe solutes in ethanol, isopropanol and ethyl acetate,respectively, to examine their OSN characteristics through the Zn-TCPP(Fe) membrane. Theintermolecular interactions of organic solvent, dye and Zn-TCPP(Fe) nanosheets profoundly influencethe mass transfer in the nano channels of the lamellar membrane. Representatively, the isopropanolsolution of Brilliant Blue G dye turns out to have a favorable OSN performance (>90 % rejection with anaverage permenance of 175 L m 2 h 1 bar 1) over 4 h, whereas replacement of isopropanol by ethanolresults in incipient loss of rejection. However, for this ethanol solution feed, incorporating an optimaldose of ZIF-8 nanograins into the nanosheets via co-deposition, a particle-over-lamellae structure formedunveils a significant improvement on OSN. Such boost is attributed to a combinative effect, i.e., alleviatingdye-nanosheet complexation so as to reduce disturbing the lamellar structure as well as to assistdesolvation of the dye over the feed side. To comprehend how solvent-slolute-nanosheet interactionsdominate OSN, besides the experimental characterizations, both visco-molar volume and Stokes-Einsteindiameter that describefluid dynamic properties of solute molecule in a solvent are employed to assist theanalysis. Possessing hydrophilic characteristic, Zn-TCPP(Fe) nanosheet engages strong hydrophilicassociation with hydrophilic dye and solvent, leading to weak OSN performance. Fundamentally, thereare mutual interactions among solvent, solute and nanosheets in this membrane system, in which theprevailed pair of them impacts OSN performance.

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