Phytic acid modified N1923 solvent impregnated resins for adsorption of in(III)

In this paper, the primary amine extractant (N1923) was modified by phytic acid (PA), and then a novel solvent impregnated resins (SIRs) were prepared using PA modified N1923 as the extractant and styrene-divinylbenzene type macroreticular resin (HZ–803) as the support. Adsorption performance and adsorption mechanism of SIRs for In (III) was studied from hydrochloric acid medium. The SIRs were characterized by FTIR, SEM, BET, TGA and XPS. The effect of mass fraction of PA, solution pH, adsorbent dosage, adsorption time, initial concentration of In(III) and adsorption temperature on adsorption was investigated. The adsorption capacity of SIRs for In(III) was enhanced by PA modified N1923. When the mass fraction of PA was 33.3%, SIRs have the highest adsorption capacity at pH of 3.13. The adsorption process can be well described by the pseudo second-order model and Langmuir isotherm model, and the adsorption of In(III) on SIRs is endothermic process. The FTIR and XPS spectra of SIRs before and after adsorption indicate that the amine group and the phosphate group are the functional groups for adsorption of In(III). In addition, the adsorption selectivity of SIRs for In(III) was also investigated at different pH. The SIRs can preferential adsorb In(III) in two components system (In(III)/Cu(II), In(III)/Zn(II), In(III)/Fe(II)) and quaternary components system (In(III)/Cu(II)/Fe(II)/Zn(II)).