African Journal of Pure and Applied Chemistry
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Article Number - 2764FDF61453


Vol.10(6), pp. 63-72 , November 2016
DOI: 10.5897/AJPAC2016.0703
ISSN: 1996-0840



Full Length Research Paper

Removal of methylene blue from aqueous solutions using biochar prepared from Eichhorrnia crassipes (Water Hyacinth)-molasses composite: Kinetic and equilibrium studies



Mupa Mathew
  • Mupa Mathew
  • Department of Chemistry, Faculty of Science, Bindura University of Science Education, Private Bag 1020, Bindura, Zimbabwe.
  • Google Scholar
Rutsito D. Desmond
  • Rutsito D. Desmond
  • Department of Chemistry, Faculty of Science, Bindura University of Science Education, Private Bag 1020, Bindura, Zimbabwe.
  • Google Scholar
Musekiwa Caxton
  • Musekiwa Caxton
  • Department of Chemistry, Faculty of Science, Bindura University of Science Education, Private Bag 1020, Bindura, Zimbabwe.
  • Google Scholar







 Received: 06 September 2016  Accepted: 21 October 2016  Published: 30 November 2016

Copyright © 2016 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


A biochar based adsorbent prepared from Eichhornia crassipes-molasses bio-composite was tested for its ability to remove methylene blue from aqueous solutions. Molasses were used as a granulating media for powdered biomass making it easier to prepare the biochar under set conditions. The Biochar adsorbent was prepared by igniting biomass granules at 400°C. A maximum adsorption capacity of 44.13 mg∙g-1 was achieved at an optimum pH 8, with a bio-sorbent dosage of 0.8 g and an initial concentration of 50 mg∙L-1. Experimental data fitted well onto Freundlich adsorption isotherm with an R2 value of 0.9819. Adsorption processes followed pseudo-second order kinetics with an R2 value of 0.9877. FT-IR spectra reveal typical absorption bands around 1563, 1375 and 1028 cm-1. SEM image show the biochar consisted of irregular particles with a microporous structure and appeared to be fibrous. BET results showed that biochar particles had a surface area of 0.8923 m2g-1, a pore volume of 0.00246 cm3∙g-1 and a pore diameter of 10.87 nm.

 

Key words: Bio-sorbent, biochar, Eichhornia crassipes, methylene blue, isotherm.

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APA Mathew, M., Desmond, R. D., & Caxton, M. (2016). Removal of methylene blue from aqueous solutions using biochar prepared from Eichhorrnia crassipes (Water Hyacinth)-molasses composite: Kinetic and equilibrium studies. African Journal of Pure and Applied Chemistry, 10(6), 63-72.
Chicago Mupa Mathew, Rutsito D. Desmond and Musekiwa Caxton. "Removal of methylene blue from aqueous solutions using biochar prepared from Eichhorrnia crassipes (Water Hyacinth)-molasses composite: Kinetic and equilibrium studies." African Journal of Pure and Applied Chemistry 10, no. 6 (2016): 63-72.
MLA Mupa Mathew, Rutsito D. Desmond and Musekiwa Caxton. "Removal of methylene blue from aqueous solutions using biochar prepared from Eichhorrnia crassipes (Water Hyacinth)-molasses composite: Kinetic and equilibrium studies." African Journal of Pure and Applied Chemistry 10.6 (2016): 63-72.
   
DOI 10.5897/AJPAC2016.0703
URL http://academicjournals.org/journal/AJPAC/article-abstract/2764FDF61453

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