Abstract
Magneso-silicate and metal in situ doping composites have been synthesized by sol–gel technique. The structure of these composites was established by chemical analysis, X-ray diffraction, thermogravimetric, and differential thermal analyses, Fourier transform infrared spectroscopy and X-ray fluorescence analysis. Magneso-silicate and in situ doping of nickel, cobalt, and cadmium composites were found to have the formulas MgSi4.26O9.53·2.17 H2O, Ni2.36Mg0.043Si2.91O·1.29 H2O, Co1.45Mg0.03Si2.7O·1.26 H2O, and CdMg0.059Si1.24O1.12·0.83 H2O, respectively. The capacities of these materials for some heavy metals such as Ni2+, Co2+, and Cd2+ were investigated and the data obtained showed that magneso-silicate has a higher capacity for the cations compared to in situ doping of heavy metal composites. Distribution coefficients in nitric acid medium have been evaluated to explore the separation potentiality of magneso-silicate for Ni2+, Co2+, and Cd2+ ions. Sorption isotherms for all cations were investigated and the data showed the applicability of Freundlich isotherm for all cases.
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