| Popis: |
Department of Chemistry, Department of Geology, Presidency College, 86/1, College Street. Kolkata-700 073, India E-mail : ucg@vsnl.net Manuscript received 16 November 2004. accepted 22 March 2005 The present study reports a systematic adsorption of lead(II) onto hydrated titanium(IV) oxide (HTO) from the aqueous solutions at 30 (±3)ºC by hatch and column methods. The particle size of HTO used is in the range 140 to 290 µm. Effect of pH, contact time for kinetics, adsorption isotherm etc. and breakthrough with influent lead(H) concentration, flow rate and bed depth variations studies are reported by batch and column methods, respectively. The Optimum pH range found for maxi-mum lead(II) sorption is 5.0 to 6.0. The adsorption data fit the tested adsorption isotherms in the following order : Langmuir > Freundlich > Temkin. Three kinetic models viz. the power function, the simple Elovich and the pseudo second-order are tested for fitting the experimental equilibrium data. Both the power function and the simple Elovich equations are found to fit best at lower adsorbate concentrations. No remarkable influence was found on adsorption of lead(Ii) by the cations and anions tested. 0.5 M HNO3 was found to be an efficient agent, which could desorb 90.0 to 92.0% of the adsorbed lead(II) from the saturated adsorbent. Column adsorption method has been applied to contaminated waste water sample of Exide India Limited (EIL) at Shyamnagar, North 24-Pargans, W.B., India. |
