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- 저자 : Vanja Kokol (검색결과 3 건)
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Vanja Kokol,Vera Vivod,Suzana Arnuš,Urh Černigoj,Betka Galičič,Kristina Obu Vazner,Branko Neral,Aleš Mihelič 한국섬유공학회 2018 Fibers and polymers Vol.19 No.7
Water stable, flexible and ecological acceptance composite films were prepared by the solvent casting process using native, dealuminated (treated with HCl to affect the surface chemistry and pore structure) and/or surface modified (coated with a cationic surfactant PDADM of different molecular weights) H-ZSM-5 type zeolite of different shapes (spherical vs. rod) and Si/Al ratios (P26 vs. P371) as adsorbents and cellulose nanofibrils (CNFs) as a networking matrix (in a weight ratio of 4:1). The films were tested for removal of the black anionic reactive dye with the highest bleeding effect at the first rinsing cycle of textile laundering. The effects of zeolite structure and surface chemistry on films dye’ removal kinetics from a standardised rinsing bath were investigated for up to 140 min at room temperature and using 0.1 g/l of dye concentration, depending on the film-to-bath weight-to-volume ratios (from 1:10 to 1:1000), thus simulating different rinsing conditions. The results show that up to 80 % of the dye was removed in the first 20 min in the lowest weight-to-volume ratio (1:10), fitting the Langmuir isotherm, and the process followed the pseudo-second order kinetic, yielding a multi-layer adsorption mechanism with a monolayer capacity of ~11 mg/g and ~21 vs. ~30 mg/g by films prepared from native or HCltreated and PDADMA100 vs. PDADMA400 coated P371 zeolites, respectively. Such efficacy was due to the more densely and fully surface-covered longitudinal P371 with PDADM400, given the huge electrostatic attraction sites for dye molecules, compared to the partly interpenetrated PDADM into relatively larger pore-sized (~450 nm vs. 220 nm) of P26. The filtration performance of the films was also examined, be used for the removal of the dye from the rinsing bath, released from the washing drum. An ultra-high flux rate (11.000 kL/m2 h MPa) with 45 % of dye removal efficacy and capacity of ~24 mg/g was provided by films prepared from spherical and aggregated P26PDADMA-400, showing its high potential also as a filter membrane.
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Tivadar Feczkó,Vanja Kokol,Bojana Voncina 한국고분자학회 2010 Macromolecular Research Vol.18 No.7
A model fragrance, vanillin, was encapsulated into ethylcellulose using an oil-in-water solvent evaporation method to prepare biodegradable microcapsules that can sustain the release of the model agent and potentially be bound to textile material. This study examined the effect of vanillin and polymer concentrations on the encapsulation efficiency, vanillin content and size of microcapsules. Microcapsules were dip-coated by chitosan, and the coating was crosslinked with non-toxic 1,2,3,4-butanetetracarboxylic acid. The release of vanillin from the uncoated and coated capsules was examined in air at elevated temperature. The experiments showed that ethylcellulose could efficiently sustain the delivery of vanillin, and additional chitosan layer increased the release of the model fragrance.
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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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