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Removal of Pb(II) from aqueous solution using pretreated rice husk at low concentrations

Zaman Shamohammadi Heidari, Milad Ghallehban Tekmedash

In this research effect of different concentrations of sodium bicarbonate were investigated on increase of rice husk capacity in lead adsorption at lowconcentrations. Themaximumadsorption efficiency occurred at pH 6.0 and adsorption equilibrium time was obtained 25 minutes. The results of chemical experiments and also scanning of the pretreated adsorbent treatments by Scanning ElectronMicroscope showed that there is suitable relation between the average numbers of adsorbent pores with adsorption efficiency. Also the maximum lead adsorption efficiency by rice husk was obtained at 99.1%. Thatwas related to the usage of 0.3Msodiumbicarbonate (0.3MNaHCO3) solution. In this research the kinetic adsorptionmodels were also studied.Although both the Lagergren model (1898) and Ho et al (1996) describes the data at 95 % level of significant, but Ho et al. model describes the data better than Lagergren model. The comparison of the obtained coefficients with model coefficients in other researches showed that lead surface adsorption by pretreated rice husk in 0.3M sodium bicarbonate solution was very fast.