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Lignocellulosic Materials as Dye Adsorbents: Adsorption of Methylene Blue and Congo Red on Brewers’ Spent Grain

Antonija Kezerle orcid id ; Vodovod-Osijek d.o.o., Poljski put 1, HR-31000, Osijek, Croatia
Natalija Velić orcid id ; Faculty of Food Technology Osijek, J. J. Strossmayer University of Osijek, F. Kuhača 20, HR-31000, Osijek, Croatia
Damir Hasenay orcid id ; Faculty of Humanities and Social Sciences, J. J. Strossmayer University of Osijek, Lorenza Jägera 9, HR-31000, Osijek, Croatia
Davor Kovačević orcid id ; Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-10000, Zagreb, Croatia

Puni tekst: engleski pdf 12.845 Kb

str. 53-64

preuzimanja: 1.345



Brewers’ spent grain (BSG), a lignocellulosic waste material, was evaluated as a low-cost adsorbent for the removal of synthetic dyes methylene blue (MB) and Congo red (CR) from aqueous solutions in a batch process. Characterisation of the BSG was performed by chemical analysis, FTIR and SEM. The effects of contact time, initial dye concentration, adsorbent particle size, adsorbent concentration and pH on the adsorption process were investigated. High removal of both dyes ranging from 70 to over 90 % was achieved. It was shown that in both cases (MB and CR adsorption) the process could be interpreted in terms of Langmuir and Freundlich adsorption isotherms. The kinetics of the adsorption process was well described by the pseudo-second-order model. The results indicated the potential use of BSG as a low-cost adsorbent for MB and CR dye removal from aqueous solutions.

This work is licensed under a Creative Commons Attribution 4.0 International License.

Ključne riječi

adsorption; brewers’ spent grain; Congo red; lignocellulose; methylene blue; synthetic dyes removal

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