Abstract
The uptake of Cd(II) ions on synthesized sodium titanate at different pH values (3.5–10.2), adsorbate concentrations (10 −2–10 −8 M) and temperatures (303–333 K) has been studied using the radiotracer technique. The results show that the uptake follows first order rate law and equilibrium data fitted well for Freundlich adsorption isotherm. A change in temperature does not affect markedly the uptake of Cd(II) ions; however, it is greatly influenced by the presence of diverse ions like Ba 2+, Ca 2+, Sr 2+, Hg 2+, Zn 2+, Na +, K + and complexing agents like acetate, phosphate, oxalate and EDTA. Radiation stability of sodium titanate was also assessed by exposing it to neutrons and gamma rays from a 11.1 GBq (RaBe) neutron source having an integral neutron flux of 3.85 × 10 6 n/cm 2/s associated with γ-dose of 1.72 Gy/h as also using a Gamma cell (4.66 kGy/h). The increasing presence of acids (HCl and H 2SO 4) decreases the uptake of Cd(II) ions, however, practically no desorption takes place into the bulk at the studied pH (5.2) and temperature (303–333 K) which suggest irreversibility of the uptake of Cd(II) ions.
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