Abstract
Polyaniline titanotungstate (PATiW) was synthesized by the sol-gel method. Adsorption isotherm studies of Cs+ from aqueous solution are described. Elemental Composition, chemical solubility, ion-exchange capacity (IEC) and pH titration are studied. Distribution coefficients (Kd) for ten metal ions have been determined. It was found that the polyaniline titanotungstate has high affinity and high selectivity for Cs+. The material was high separation of Cs+ from other metal ions. The adsorbent capacity was determined using the Freundlich and Langmuir adsorption isotherm models. The Cs+ adsorption isotherm data fit best to the Freundlich isotherm model. The maximum Cs+ uptake of polyaniline titanotungstate was found 217 mg/g. A column tests were performed to determine the breakthrough curves with varying bed depths and flow rates in different solutions. The results show that the half breakthrough time increases proportionally with increasing bed depths. Kinetic studies for removal cesium from milk were investigated.
Highlights
Radioactive waste is an inevitable residue from the use of radioactive materials in industry, research and medicine, as well as from the use of nuclear power to generate electricity
An inorganic precipitate ion-exchanger based on organic polymeric matrix must be an interesting material, as it should possess the mechanical stability due to the presence of organic polymeric species and the basic characteristics of an inorganic ion-exchanger regarding its selectivity for some particular metal ions [7,8,9,10]
The ion-exchange capacity (IEC) of polyaniline was determined by the repeated batch technique, by equilibrating 50 mg solid with 5 ml of 0.1 M cesium chloride solution on a shaker thermostat adjusted at 25 ̊C ± 1 ̊C and attain for equilibrium, decontamination of solution was took place and saturation process was repeated until no further sorption
Summary
Radioactive waste is an inevitable residue from the use of radioactive materials in industry, research and medicine, as well as from the use of nuclear power to generate electricity. In order to obtain a combination of these advantages associated with polymeric and inorganic materials as ionexchangers, attempts have been made to develop polymeric-inorganic composite ion-exchangers by incorporation of organic monomers in the inorganic matrix [3]. Few such excellent ion-exchange materials have been developed in our laboratory and successfully being used in chromatographic techniques [4,5,6]. Isotherm and column studies were applied at different conditions for removal cesium It is found high selectivity for cesium from other metal ions from radioactive waste, aqueous solution and applied for removal cesium from milk
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