Modified activated carbon with tris(hydroxymethyl)aminomethane for selective adsorption and determination of lead in water samples

In the current study, a sensitive and simple method for selective separation of gold, Pb(III), from water samples prior to its determination by inductively coupledplasma-optical emission spectrometry (ICP-OES), was investigated. The method utilized activated carbon modified with tris(hydroxymethyl)aminomethane (AC–TRIS) as a solid-phase extractant. Surface properties of the AC–TRIS phase were characterized by Fouriertransform infrared (FT-IR) spectroscopy. The separationparameters for effective adsorption of Pb(III), including effects of pH, Pb(III) concentration, shaking time, andcommon coexisting ions were examined using batch method. The optimum pH value for the separation of Pb(III) on the new sorbent was 1.0, and the maximumstatic adsorption capacity of Pb(III) onto the AC–TRIS was 33.57 mg g_1 at this pH and after 1 h contact time.The Pb(III) adsorption data were modeled using bothLangmuir and Freundlich classical adsorption isotherms. Results demonstrated that the adsorption ofPb(III) onto activated carbon followed second-order kinetic model. In addition, the efficiency of this methodology was confirmed by applying it to real environmental samples.

کلیدواژه ها:

Tris(hydroxymethyl)aminomethane ، Pb(III) ، Modified activated carbon ، Adsorption ، Batch method