2021-12-092021-12-092009-10-15Kara, A. (2009). "Adsorption of Cr(VI) ions onto poly(ethylene glycol dimethacrylate-1-vinyl- 1,2,4-triazole)". Journal of Applied Polymer Science, 114(2), 948-955.0021-8995https://doi.org/10.1002/app.29169https://onlinelibrary.wiley.com/doi/10.1002/app.29169http://hdl.handle.net/11452/23110Poly(ethylene glycol dimethacrylate-1-vinyl-1,2,4-triazole) [poly(EGDMA-VTAZ) beads (average diameter = 150-200 mu m) were prepared by copolymerizing ethylene glycol dimethacrylate (EGDMA) with 1-vinyl-1,2,4-triazole (VTAZ). Poly(EGDMA-VTAZ)] beads were characterized by swelling studies and scanning electron microscope (SEM). The adsorption of Cr(VI) from solutions was carried at different contact times, Cr(VI) concentrations, pH, and temperatures. High adsorption rates were achieved in about 240 min. The amount of Cr(VI) adsorbed increased with increasing concentration and decreasing pH and temperature. The intraparticle diffusion rate constants at various temperatures were calculated. Adsorption isotherms of Cr(VI) onto poly(EGDMA-VTAZ) have been determined and correlated with common isotherm equations such as Langmuir and Freundlich isotherm models. The Langmuir isotherm model appeared to fit the isotherm data better than the Freundlich isotherm model. The pseudo first-order kinetic model was used to describe the kinetic data. The study of temperature effect was quantified by calculating various thermodynamic parameters such as Gibbs free energy, enthalpy, and entropy changes. The dimensionless separation factor (R-L) showed that the adsorption of metal ions onto poly(EGDMA-VTAZ) was favorable. It was seen that values of distribution coefficient (K-D) decreasing with Cr(VI) concentration in solution at equilibrium (C-e) indicated that the occupation of activate surface sites of adsorbent increased with Cr(VI).eninfo:eu-repo/semantics/closedAccessAdsorptionAdsorption isothermsAdsorption kineticsCr(VI)Heavy-metal ionsAqueous-solutionsComplexing-ligandRemovalBeadsChromium(VI)BiosorptionDyeCadmium(II)SpeciationPolymer scienceAdsorption isothermsAtmospheric temperatureCeriumCerium compoundsChromiumChromium compoundsDyesEthyleneEthylene glycolMetal ionsNitrogen compoundsRate constantsScanning electron microscopyThermal effectsAdsorption ratesAverage diameterContact timeCr(VI)Distribution coefficientEntropy changesEthylene glycol dimethacrylateFirst-order kinetic modelsFreundlich isotherm modelIntra-particle diffusionIsotherm dataIsotherm equationsKinetic dataLangmuir and Freundlich isotherm modelsLangmuir isotherm modelsScanning electron microscopesSeparation factorsSurface sitesSwelling studiesTemperature effectsThermodynamic parameterAdsorptionConcentrationCopolymerizationpHPolyethylene glycolSwellingTemperature effectArticle0002688983000352-s2.0-676510073579489551142Polymer scienceChromium Hexavalent Ion; Biosorbents; Second-Order Model