Modeling of thorium (IV) ions adsorption onto a novel adsorbent material silicon dioxide nano-balls using response surface methodology
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2016
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Abstract
The silicon dioxide nano-balls (nano-SiO2) were prepared for the adsorption of thorium (IV) ions from aqueous solution. The synthesized silicon dioxide nano-balls were characterized by Scanning Electron Microscopy/Energy Dispersive X-ray, X-ray Diffraction, Fourier Transform Infrared and BET surface area measurement spectroscopy. The effects of pH, concentration, temperature and the solid–liquid ratio on the adsorption of thorium by nano-balls were optimized using central composite design of response surface methodology. The interaction between four variables was studied and modelled. Furthermore, the statistical analysis of the results was done. Analysis of variance revealed that all of the single effects found statistically significant on the sorption of Th(IV). Probability F-values (F=4.64–14) and correlation coefficients (R2=0.99 for Th(IV)) indicate that model fit the experimental data well. The ability of this material to remove Th(IV) from aqueous solution was characterized by Langmuir, Freunlinch and Temkin adsorption isotherms. The adsorption capacity of thorium (IV) achieved 188.2 mg g−1. Thermodynamic parameters were determined and discussed. The batch adsorption condition with respect to interfering ions was tested. The results indicated that silicon dioxide nano-balls were suitable as sorbent material for adsorption and recovery of Th(IV) ions from aqueous solutions. © 2016 Elsevier Ltd
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Ions , Scanning electron microscopy , Silica , Silicon oxides , Sol-gel process , Sol-gels , Solutions , Surface properties , Thorium , X ray diffraction , adsorbent , silicon dioxide , thorium , Adsorption and recoveries , BET surface area measurement , Central composite designs , Correlation coefficient , Fourier transform infra reds , Nanoballs , Response surface methodology , Thermodynamic parameter , adsorption , aqueous solution , Article , concentration (parameters) , controlled study , energy dispersive X ray spectroscopy , infrared spectroscopy , isotherm , liquid , pH , priority journal , response surface method , scanning electron microscopy , solid , surface area , synthesis , temperature , thermodynamics , X ray diffraction , Adsorption