Wodyetia bifurcata biochar for methylene blue removal from aqueous matrix.

Authors :: Dos Santos KJL
Dos Santos GES
de Sá ÍMGL
Ide AH
Duarte JLDS
de Carvalho SHV
Soletti JI
Meili L
Source :: Bioresource technology [Bioresour Technol] 2019 Dec; Vol. 293, pp. 122093. Date of Electronic Publication: 2019 Aug 31.
Publication Year :: 2019
Abstract: The endocarp of Wodyetia bifurcata was used to produce biochar by vacuum pyrolysis as an alternative adsorbent for methylene blue (MB) removal. The influence of different pyrolysis temperatures, particle diameters and activation agents in the adsorption process was studied. Kinetics and adsorption equilibrium were also evaluated. Biochar obtained at higher pyrolysis temperatures and activated with H <subscript>3</subscript> PO <subscript>4</subscript> showed the best adsorptive capacities, achieving 83% of MB removal. The experimental data fitted better with pseudo-second order model. Isotherms performed at 25, 40, 50 and 60 °C showed that the adsorption of MB onto the activated biochar had no concentration dependence in the range studied. Experimental isotherms fitted well with the Freundlich and Sips models and the thermodynamic parameters suggested a physical adsorption mechanism in a heterogeneous surface, spontaneous at all temperatures evaluated. In brief, the activated carbon obtained from Wodyetia bifurcata can be a promising material for MB removal from aqueous solutions.<br /> (Copyright © 2019 Elsevier Ltd. All rights reserved.)