Biosorption of methylene blue and malachite green from single and binary solutions by Pinus pinaster bark


  • Khaoula Litefti Universidade de Santiago de Compostela. School of Engineering. Department of Chemical Engineering. Santiago de Compostela, Spain.
  • M. Sonia Freire Universidade de Santiago de Compostela. School of Engineering. Department of Chemical Engineering. Santiago de Compostela, Spain.
  • Mostafa Stitou Abdelmalek Essaâdi University. Faculty of Sciences. Department of Chemistry. Tétouan, Morocco.
  • Julia González-Álvarez Universidade de Santiago de Compostela. School of Engineering. Department of Chemical Engineering. Santiago de Compostela, Spain.



Bark, binary solutions, adsorption, Langmuir isotherm, malachite green, methylene blue, Pinus pinaster, wood veneer


Aiming to develop a sustainable separation process reducing the water pollution, in this work Pinus pinaster (cluster pine) bark from a wood veneer industry was used for methylene blue and malachite green removal from aqueous systems. For single adsorption, the influence of time (up 8 h), adsorbent dose (2,5 - 5- 10 g·L-1), temperature (25 ºC - 40 ºC - 60 ºC), pH (2 - 4 - 6) and particle size (0,1 mm - 0,5 mm, 0,5 mm - 1 mm and 1,6 mm - 2 mm) on adsorption was investigated. To study the initial concentration effect on binary adsorption, different concentrations (0 - 5 - 25 - 50 mg·L-1) were used at 25 ºC, natural pH and a dose of 5 g·L-1. High efficiency was obtained at pH = 4 (natural pH), dose of 5 g·L-1 and particle size of 0,5 - 1 mm.

Adsorption percentages higher than 70 % were reached in less than one hour, with removal almost complete at equilibrium in single systems, without temperature influence. Methylene blue was slightly better adsorbed b ybark. In binary systems, dyes exhibited competitive adsorption, decreasing their removal, especially increasing the ini- tial concentration of the other dye. Dyes adsorption followed the pseudo-second order kinetic model, whereas the Langmuir isotherm explained adsorption equilibria in mono-component systems. High adsorption capac- ities (41,7 mg·g-1 for malachite green and 50,0 mg·g-1 for methylene blue) were obtained at 40 ºC and natural pH indicating that pine bark can be effectively used as biosorbent.


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How to Cite

Litefti, K. ., Freire, M. S., Stitou, M. ., & González-Álvarez, J. . (2023). Biosorption of methylene blue and malachite green from single and binary solutions by Pinus pinaster bark. Maderas. Ciencia Y Tecnología, 26, 1–12.




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