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Adsorption of Lead(II) by Silica/Cell Composites from Aqueous Solution: Kinetic, Equilibrium, and Thermodynamics Studies
Author(s) -
Ou HongXiang,
Song YuJun,
Wang Qian,
Pan JianMing,
Bian WeiBai,
Yi Chengwu,
Yan YongSheng
Publication year - 2013
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143012x13461650921211
Subject(s) - adsorption , endothermic process , aqueous solution , freundlich equation , sorption , langmuir , chemistry , thermodynamics , langmuir adsorption model , diffusion , isothermal process , physics
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 HNO 3 solution and would be a potential adsorbent.