Pre-concentration of some heavy metal ions with AlO–HQ and AlO–PHQ and their studies by FTIR and spectroscopy

Immobilization of HQ and PHQ on the surface of alumina, Al2O3 (referred to it by AlO) as an application for cation exchange of Al(III) in solution, using them for the extraction of some heavy metal ions from their solutions and calculating their capacity was studied. Immobilization of HQ or PHQ on Al2O3 was carried out and used for the extraction of some metal ions such as Fe(III), Cu(II), Co(II) and Ni(II) from its solution. Spectra of substrate (AlO–HQ, AlO–PHQ or AlO–Cu) at universal buffer solution (pH 7.2 ± 0.1) were recorded, solution of metal ion was added after contact time, filtered, and the solid precipitate was dissolved in pure ethanol, a peak at 305 nm was observed corresponding to HQ–Al(III). On addition of Cu(II) ion solution to AlO–HQ, a peak at 380 nm appeared corresponding to HQ–Cu(II), the peak at 305 nm decreased until it disappeared. The capacity of AlO–HQ was 100 mmol/g, whereas on addition of Fe(III) ion solution, new two peaks appeared at 580 and 455 nm corresponding to the formation of HQ–Fe(III) coordinated complex. The capacity of AlO–HQ for Fe(III) ion was 100 mmol/g. On addition of Ni(II) and Co(II), the capacity of AlO–HQ for the extraction of Ni(II) and Co(II) are 62.5 and 150 mmol/g, respectively. In the same conditions, and in the same way, Uv–visible absorption spectra of some metal ions extracted by AlO–PHQ were determined and the capacity of these metals was calculated as: [Cu(II): 500, Fe(III): 500, Ni(II): 75 and Co(II): 250 mmol/g]. As an application, extraction of Ni(II) from real solution sample (nickel nut) by AlO–PHQ was observed.