Silica/cell composites were prepared for the adsorption of lead ions, Pb(II), from aqueous solution in a batch system. The silica/cell composites possessed micropores, high surface area, and abundant functional groups. Adsorption performance was investigated by analyzing the effects
of such factors as the initial pH, contact time with different initial concentration, and initial Pb(II) concentration at different temperature. The kinetic data were fitted to pseudo-second-order and intraparticle diffusion kinetic models. The results were better fitted by the pseudo-second-order
kinetic model. Intraparticle diffusion increased with an increase of initial concentration and the sorption process was controlled by film diffusion. The Langmuir isotherm model was fitted to the experimental data significantly better than Freundlich and Dubinin‐Radushkevich isotherm
models. The maximum adsorption capacity was 97.10 mg g−1, according to the Langmuir isotherm model. Thermodynamics parameters confirmed the spontaneous, endothermic, and entropy-gained nature within the studied temperature range (from 298 to 318 K). The composites could be
effectively desorbed by the 2.0 mol L−1 HNO3 solution and would be a potential adsorbent.
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu, China 2:
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
Publication date: February 1, 2013
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