Tekin, Nalan2022-05-112022-05-112015-04-09Kara, A. vd. (2005). "Magnetic vinylphenyl boronic acid microparticles for Cr(VI) adsorption: Kinetic, isotherm and thermodynamic studies". Journal of Hazardous Materials, 286, 612-623.0304-3894https://doi.org/10.1016/j.jhazmat.2014.12.011https://www.sciencedirect.com/science/article/pii/S0304389414009947http://hdl.handle.net/11452/26380Magnetic vinylphenyl boronic acid microparticles, poly(ethylene glycol dimethacrylate(EG)-vinylphenyl boronic acid(VPBA)) [m-poly(EG-VPBA)], produced by suspension polymerization and characterized, was found to be an efficient solid polymer for Cr(VI) adsorption. The m-poly(EG-VPBA) microparticles were prepared by copolymerizing of ethylene glycol dimethylacrylate (EG) with 4-vinyl phenyl boronic acid (VPBA). The m-poly(EG-VPBA) microparticles were characterized by N-2 adsorption/desorption isotherms, electron spin resonance (ESR), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), elemental analysis, scanning electron microscope (SEM) and swelling studies. The m-poly(EG-VPBA) microparticles were used at adsorbent/Cr(VI) ion ratios. The influence of pH, Cr(VI) initial concentration, temperature of the removal process was investigated. The maximum removal of Cr(VI) was observed at pH 2. Langmuir isotherm and Dubinin-Radushkvich isotherm were found to better fit the experiment data rather than Fruendlich isotherm. The kinetics of the adsorption process of Cr(VI) on the m-poly(EG-VPBA) microparticles were investigated using the pseudo first-order, pseudo-second-order, Ritch-second-order and intraparticle diffusion models, results showed that the pseudo-second order equation model provided the best correlation with the experimental results. The thermodynamic parameters (free energy change, Delta G(0) enthalpy change, Delta H-0; and entropy change, Delta S-0) for the adsorption have been evaluated.eninfo:eu-repo/semantics/closedAccessMagnetic polymersAdsorption isothermAdsorption kineticAdsorption thermodynamicCr(VI) ionsAqueous-solutionAffinity-chromatographyHexavalent chromiumWaste-waterRemovalIonsEquilibriumTemperatureSorptionBeadsEngineeringEnvironmental sciences & ecologyAdsorptionAdsorption isothermsChromium compoundsDyesEthyleneEthylene glycolFourier transform infrared spectroscopyFree energyGravimetric analysisKineticsMagnetic momentsPolymersPolyolsScanning electron microscopySuspensions (fluids)ThermodynamicsThermogravimetric analysisX ray diffractionAdsorption kineticsAdsorption thermodynamicsCrIII ionsEthylene glycol dimethacrylateIntraparticle diffusion modelsMagnetic polymersThermal gravimetric analyses (TGA)Electron spin resonance spectroscopyAdsorptionChromiumIsothermMicrostructurePolymerPolymerizationThermodynamicsAdsorptionBoronic acidsChromiumKineticsMagnetic phenomenaMethacrylatesPolyethylene glycolsThermodynamicsVinyl compoundsWaste disposal, fluidWater pollutants, chemicalWater purificationArticle0003519631000692-s2.0-8492234028761262328625666882Engineering, environmentalEnvironmental sciencesAqueous Solution; Biosorbents; Second-Order ModelBoronic acid derivativeChromiumEthylene glycol dimethacrylateMagnetic nanoparticleUnclassified drugVinylphenyl boronic acid4-vinylphenyl boronic acidBoronic acid derivativeChromiumChromium hexavalent ionMacrogol derivativeMethacrylic acid derivativePoly(ethylene glycol)-dimethacrylateVinyl derivativeWater pollutantAdsorption kineticsAqueous solutionArticleDesorptionDiffusionElectron spin resonanceEnthalpyEntropyHysteresisInfrared spectroscopyIsothermMagnetic fieldpHPolymerizationScanning electron microscopeSurface chargeTemperature sensitivityThermodynamicsThermogravimetryX ray diffractionAdsorptionChemistryKineticsMagnetismProceduresSewageThermodynamicsWater managementWater pollutant