Chemical studies on polyaniline titanotungstate and its uses to reduction cesium from solutions and polluted milk

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 curve are studied. Distribution coefficients (Kd) for 10 metal ions were determined. It was found that the polyaniline titanotungstate is highly selective to Cs+ and the selectivity order is Cs+ >>> Zr4+ > Mo6+ > V5+ > As5+ > Cr3+ > Co2+ > Cu2+ > Zn2+ > Cd2+. 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 to be 217 mg g−1. Column tests were performed to determine the breakthrough curves with varying bed depths and flow rates in different solutions. The results showed that the half breakthrough time increases proportionally with increasing bed depths. Kinetic studies for removal of cesium from milk were also investigated using a scintillation detector head (NaI).

The uptake of cesium-134 and the decaying of cesium activity are shown as a function of time in Fig. 9. The reaction half-life was 30 min, and by 60 min the reaction was 80% complete. The reaction reached equilibrium at 2 h. Figure optionsDownload as PowerPoint slideHighlights
► Polyaniline titanotungstate was selective for cesium.
► High stability.
► Removal of cesium from acid and milk.