The existence of lead in water supplies is great concern due to its potential effects on human health. This study demonstrates beneficial adsorptive elimination of lead from water using titanium dioxide nanoparticles produced by sol-gel method followed by calcination at 400oC. The structure of the resulting sample and the surface species of nanoadsorbent were determined using X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron spectrometer (XPS). Batch adsorption experiment was carried out to analyze lead removal capacity of the nanoadsorbent. The amount of adsorbed lead by the nanoadsorbent increased with increasing pH. The sorption kinetic data of lead followed the pseudo-second-order model. The equilibrium data were modeled with the help of Langmuir, Freundlich, Redlich-Peterson and Sips equations. Based on the values of correlation coefficients (R2) and the average percent error (APE), the Langmuir isotherm equation was excellently fitted to the experimental data of the lead adsorption with diminutive error. The maximum experimental adsorption uptakes were 31.25 mg/g for lead. From the thermodynamic calculations the favorable Gibbs energies were entropically controlled during the lead adsorption. This study is valuable for the quality utilization of drinking water that includes lead contamination by using titanium dioxide nanoparticles as a nanoadsorbent.

Preparation and evaluation of titanium dioxide nanoparticles for enhanced lead removal

247th National Meeting (2014)

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