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Magnetic vinylphenyl boronic acid microparticles for Cr(VI) adsorption: Kinetic, isotherm and thermodynamic studies
- Publication Year :
- 2015
- Publisher :
- Elsevier, 2015.
-
Abstract
- Magnetic 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.
- Subjects :
- Chromium
Adsorption thermodynamics
Boronic acids
Polymers
Ethylene glycol dimethacrylate
Entropy
Magnetic nanoparticle
Procedures
Polymerization
Diffusion
Enthalpy
Electron spin resonance
Organic chemistry
Adsorption isotherm
Polymer
Water pollutant
Waste Management and Disposal
Dyes
pH
Adsorption isotherms
Magnetism
Langmuir adsorption model
Cr(VI) ions
Pollution
Vinyl compounds
Thermogravimetry
Methacrylates
Thermogravimetric analysis
Environmental Engineering
Equilibrium
Article
Ethylene
Intraparticle diffusion models
Adsorption
Electron spin resonance spectroscopy
Free energy
4-vinylphenyl boronic acid
Ions
Suspensions (fluids)
Aqueous-solution
Water management
Magnetic field
Affinity-chromatography
Waste-water
Temperature sensitivity
Adsorption thermodynamic
Unclassified drug
Adsorption kinetic
Health, Toxicology and Mutagenesis
Boronic acid derivative
CrIII ions
chemistry.chemical_compound
Engineering
Gravimetric analysis
Adsorption kinetics
Desorption
Aqueous solution
Microstructure
Waste disposal, fluid
Infrared spectroscopy
Water pollutants, chemical
Sewage
Chemistry
Polyethylene glycols
Methacrylic acid derivative
Temperature
Poly(ethylene glycol)-dimethacrylate
Fourier transform infrared spectroscopy
Magnetic polymers
Scanning electron microscope
Magnetic moments
symbols
Sorption
Polyols
Thermodynamics
Aqueous Solution
Biosorbents
Second-Order Model
Suspension polymerization
Beads
Scanning electron microscopy
X ray diffraction
Chromium compounds
Vinyl derivative
Hexavalent chromium
symbols.namesake
Environmental sciences & ecology
Thermal gravimetric analyses (TGA)
Magnetic phenomena
Environmental Chemistry
Ethylene glycol
Isotherm
Water purification
Hysteresis
Engineering, environmental
Surface charge
Vinylphenyl boronic acid
Environmental sciences
Kinetics
Macrogol derivative
Removal
Boronic acid
Chromium hexavalent ion
Nuclear chemistry
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....fea20ee47f8cd60ec8ae68741f14fc8c