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Crambe pie modified for removal of cadmium, lead and chromiumfromaqueous solution

Author: 
Daniel Schwantes, Affonso Celso Gonçalves Jr., Gustavo Ferreira Coelho, Marcelo Angelo Campagnolo, Marcelo Gonçalves do Santos, Alisson Junior Miolaand and Eduardo Ariel Völz Leismann
Subject Area: 
Physical Sciences and Engineering
Abstract: 

This study examined the performance of the adsorbents created from the pie of Crambe abyssinica Hochst and its adsorption capacity for removal of metal ions Cd(II), Pb(II) and Cr(III) from contaminated water. Firstly, crambe pie was obtained, dried, milled and sifted for standardization of its particle size. The crambe biomass was chemically modified with H2O2, H2SO4 and NaOH by solutions of 0.1 mol L-1. After this step were performed the adsorption tests aimed to determine the best conditions of pH, adsorbent mass, and contact time between adsorbent/adsorbate to the removal of the metals Cd, Pb and Cr. From these preliminary results were obtained the adsorption isotherms and thermodynamic parameters, such as ΔH, ΔG and ΔS. It is observed that the modifying solutions were effective in the modification of adsorbents, resulting in adsorbent materials of high capacity. It is noted an equilibrium time for Cd, Pb and Cr about 40 minutes. By the obtained results can be concluded that the modified crambe pie are excellent adsorbent materials, renewable, with high availability and low cost, being an attractive alternative for industrial use in advanced treatment systems, for removal of metals as Cd, Pb and Cr.

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