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      저자 : Madhuri Lakhane (검색결과 1 건)
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        Nanocomposite Films Prepared from Differently Modified ZSM-5 Zeolite and Cellulose Nanofibrils for Cationic and Anionic Dyes Removal

        Madhuri Lakhane,Megha Mahabole,Kashinath Bogle,Rajendra Khairnar,Vanja Kokol 한국섬유공학회 2019 Fibers and polymers Vol.20 No.10

        Ecologically-friendly and water-stable composite films were prepared by solvent casting process using variableconcentrations (20 and 80 wt %) of de-aluminated (D-ZSM) and Cu (Cu-ZSM) or Fe (Fe-ZSM) ion-exchanged ZSM-5(ZSM) zeolite as adsorbents and 0.6 wt% of cellulose nanofibrils (CNFs) as a matrix, to be used in removal of both cationicand anionic dyes. The films were characterized by spectroscopic (FTIR and XRD), microscopic (SEM), potentiometrictitration, and CO2-adsorption (BET) analysis, and tested for cationic and anionic dyes removal capacity and kinetic via thebatch adsorption process in aqueous buffer solutions. The influence of contact time, initial dye concentration, and pH isinvestigated and evaluated using various isotherm and kinetic models. The Langmuir isotherm is recognized as better fittingmodel for relevant study conditions, and the process follows pseudo-second order kinetic, yielding a monolayer adsorptioncapacity of about 34 mg/g and 16 mg/g for cationic and anionic dyes using D-ZSM/CNF and Fe-ZSM/CNF based films,respectively. Maximum dye removal is observed for a higher (80 wt %) amount of ZSM containing films and pH ≥ 7 vs. pH≤ 7, influencing on electrostatic, physical, and hydrophobic adsorption mechanism. A higher adsorption efficiency of DZSM/CNF film with surface area of 194 m2/g is also related to unevenly distributed and globule-like structures of 40 nmsized D-ZSM, compared to more densely-packed and 72 nm sized platelet/flake-like structures of Cu-ZSM and Fe-ZSMcovering the CNFs surface (7.5 m2/g). The films show potential in removal of differently charged contaminants, thus actingwithin a broader pH range, by being prepared with a combination of suitably modified ZSMs.

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