Removal of thorium (IV) ions from aqueous solution by a novel nanoporous ZnO: Isotherms, kinetic and thermodynamic studies
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Date
2015
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Abstract
The adsorption of thorium (IV) from aqueous solutions onto a novel nanoporous ZnO particles prepared by microwave assisted combustion was studied using batch methods under different experimental conditions. The effect of contact time, solution pH, initial concentration and temperature on adsorption process was studied. The ability of this material to remove Th (IV) from aqueous solution was characterises by Langmuir, Freunlinch and Temkin adsorption isotherms. The adsorption percent and distribution coefficient for nanoporous ZnO powders in optimum conditions were 97% ± 1.02; 8080 L kg-1for Th (IV), respectively. Based on the Langmuir model, the maximum adsorption capacity of nanoporous ZnO for Th (IV) was found to be 1500 g kg-1. Thermodynamic parameters were determined and discussed. The results indicated that nanoporous ZnO was suitable as sorbent material for recovery and adsorption of Th (IV) ions from aqueous solutions. The radioactive Th (VI) in surface water, sea water and waste waters from technologies producing nuclear fuels, mining (uranium and thorium) and laboratories working with radioactive materials (uranium and thorium) can be removed with this nanoporous ZnO. © 2015 Elsevier Ltd.
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Adsorption , Environmental Restoration and Remediation , Hydrogen-Ion Concentration , Kinetics , Metal Nanoparticles , Temperature , Thermodynamics , Thorium , Time Factors , Water Pollutants, Radioactive , Zinc Oxide , Nuclear fuels , Radioactive materials , Radioactive wastes , Radioactivity , Seawater , Solutions , Surface waters , Thorium , Uranium , Waste incineration , Zinc oxide , nuclear fuel , radioactive material , thorium , uranium , zinc oxide nanoparticle , metal nanoparticle , thorium , water pollutant , zinc oxide , Adsorption capacities , Distribution coefficient , Experimental conditions , High capacity , Kinetic and thermodynamic studies , Microwave-assisted combustions , Nanoporous ZnO , Thermodynamic parameter , adsorption , aqueous solution , efficiency measurement , experimental study , ion exchange , isotherm , oxide , pollutant removal , porous medium , radioactivity , reaction kinetics , thermodynamics , thorium , uranium , zinc , adsorption , adsorption kinetics , aqueous solution , Article , combustion , environmental protection , environmental radioactivity , microwave radiation , powder , technology , temperature , thermodynamics , waste water , waste water management , water pollutant , analysis , chemistry , devices , ecosystem restoration , kinetics , pH , procedures , time factor , water pollutant , Adsorption