Metal Doping Silicates as Inorganic Ion Exchange Materials for Environmental Remediation

Environmental remediation of hazardous metals like Cd(II), and Co(II) ions is very necessary due to their toxicity at trace and accumulation levels in the biosystem. In this study, the sorption of Co(II), and Cd(II) ions from aqueous solutions onto titano-silicate (TiSi) ion exchange material and in-situ dopping composites cobalt titano-silicate (Co-TiSi) and cadmium titano-silicate (Cd-TiSi) was achieved. TiSi and in-situ dopping composites were obtained by precipitation technique and characterized using different analytical tools such as FT-IR, XRD, TGA&DTA, and XRF. Results obtained from this study showed that the capacity for Co(II), and Cd(II) ions revealed that Co-TiSi and Cd-TiSi is a higher capacity than those obtained for TiSi by 1.81, and 1.41 times value, respectively. The distribution coefficients for Co-TiSi as a function of HNO 3 have high separation factors for Co(II) at different HNO 3 concentrations. Langmuir isotherm model is the most representative for discussing the sorption process with a maximum sorption capacity of 16.02, and 10.96 mg/g for Co(II), and Cd(II) ions, respectively. Co-TiSi is suitable for the column technique for the recovery of studied cations. The investigation proved that a Co-TiSi exchanger is suitable for the uptake of the studied ions from liquid solutions and could be considered as potential material for the refining of effluent polluted with these ions. Highlights Titano-silicate and in-situ dopped composites were prepared by precipitation technique. The capacity for Co(II), & Cd(II) ions sorbed on Co-TiSi, and Cd-TiSi is higher than obtained for TiSi by 1.81, and 1.41 values, respectively. Co-TiSi is suitable for the column technique for the removal of studied cations.