Novel D2EHPA-polysiloxane-based Sorbent for Titanium (IV) Extraction and Separation
DOI:
https://doi.org/10.29356/jmcs.v55i2.834Keywords:
titanium (IV), solid-phase extraction, polysiloxanesAbstract
Abstract. In this work the synthesis, characterization and evaluation of a novel sorbent material used for the solid-phase extraction of titanium (IV) from hydrochloric acid medium is described. The material was prepared by the sol-gel route incorporating bis(2-ethylhexylphosphoric acid) (D2EHPA) as extractant within a polymeric matrix based on polysiloxanes and characterized through FTIR-ATR, XRD, 29Si and 31P NMR, TGA and DSC. In studies of titanium sorption and desorption in batch mode several factors related with the extraction and back-extraction operations were evaluated, such as: contact time, titanium concentration, nature and composition of the aqueous media, and extractant concentration in the sorbent. The maximum sorption was observed at 30 min of contact time in a 1 mol L-1 HCl + 0.1% KCl medium, while the maximum desorption was observed at 60 min in a 1.5 mol L-1 H2SO4 + 20% v/v H2O2 medium when titanium concentration was 70 mg L-1. Under optimal conditions the recovered percent of titanium was nearly 90%. In addition, the characterization of the extraction equilibrium was performed. The selectivity of the method was studied adding Al(III), Fe(III) and V(V) to the extraction medium.
A high selectivity for Ti over Al and Fe was observed, even at high concentrations of the interferents; 50% of Ti, only 7% of Fe, 3% of Al and less than 1% of V were recovered under the established conditions. The method was finally applied for titanium recovery from a certified fly ash sample generated from a municipal incineration plant.
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