Removal of Cr (VI) from aqueous solutions by the nonliving biomass of Alligator weed: kinetics and equilibrium |
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Authors: | Xue Song Wang Ye Ping Tang Sheng Rong Tao |
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Institution: | (1) Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu, 222005, China |
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Abstract: | The removal of Cr (VI) from aqueous solutions using Alligator weed, a freshwater macrophyte, was investigated in batch studies.
Various factors including solution pH, Cr (VI) concentrations, agitation time, and temperature were taken into account and
promising results obtained. An initial solution pH of 1.0 was most favorable for Cr (VI) removal. The kinetic data were analyzed
using several models, including the pseudo-second-order equation, external diffusion model, and intraparticle diffusion model.
The comparison gave insight about the mechanism of adsorption and potential rate controlling step. The results suggested that
the Cr (VI) adsorption at all temperatures was best represented by the pseudo-second-order equation. The external film diffusion
played an important role in the adsorption mechanism. The Freundlich, Langmuir and Langmuir-Freundlich isotherms for the present
system were analyzed. The best interpretation for the equilibrium data at different temperatures was given by the Langmuir-Freundlich
isotherm. The Alligator weed could serve as low-cost adsorbent to remove Cr (VI) from aqueous solutions. |
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Keywords: | Batch adsorption Cr (VI) Alligator weed Isotherm Separation |
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