TY - JOUR
T1 - Removal of dyes from aqueous solutions by adsorbent prepared from coffee residues
AU - López, L.
AU - Ramirez, A. P.
AU - Giraldo, S.
AU - Flórez, E.
AU - Acelas, N. Y.
N1 - Publisher Copyright:
© 2019 Published under licence by IOP Publishing Ltd.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/11/29
Y1 - 2019/11/29
N2 - This study reports the production of an adsorbent material derived from extracted coffee residues using phosphoric acid and zinc chloride as activating agents. The structural features of the materials were characterized using different analytical techniques. The BET surface areas were found between 3.81 m2.g-1 y 176.27 m2.g-1, while the FTIR analysis showed the formation of oxygenated functional groups, which are active in the adsorption process. These materials were evaluated as adsorbents for the removal of methylene blue from aqueous solution. Batch adsorption tests were performed at room temperature and the effects of contact time and, initial dye concentration was investigated. The equilibrium adsorption results were complied with Langmuir isotherm model and its maximum monolayer adsorption capacity was 15.92 mg.g-1. Adsorption kinetics studies indicated that the pseudo second order model yielded the best fit for the kinetic data. This typical dependence of methylene blue uptake on kinetic studies indicated the adsorption process to be both chemisorption and diffusion controlled. The experimental data obtained in the present study indicate that coffee residues are suitable candidates for use as adsorbents in the removal of cationic dyes.
AB - This study reports the production of an adsorbent material derived from extracted coffee residues using phosphoric acid and zinc chloride as activating agents. The structural features of the materials were characterized using different analytical techniques. The BET surface areas were found between 3.81 m2.g-1 y 176.27 m2.g-1, while the FTIR analysis showed the formation of oxygenated functional groups, which are active in the adsorption process. These materials were evaluated as adsorbents for the removal of methylene blue from aqueous solution. Batch adsorption tests were performed at room temperature and the effects of contact time and, initial dye concentration was investigated. The equilibrium adsorption results were complied with Langmuir isotherm model and its maximum monolayer adsorption capacity was 15.92 mg.g-1. Adsorption kinetics studies indicated that the pseudo second order model yielded the best fit for the kinetic data. This typical dependence of methylene blue uptake on kinetic studies indicated the adsorption process to be both chemisorption and diffusion controlled. The experimental data obtained in the present study indicate that coffee residues are suitable candidates for use as adsorbents in the removal of cationic dyes.
UR - http://www.scopus.com/inward/record.url?scp=85077018900&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/1386/1/012035
DO - 10.1088/1742-6596/1386/1/012035
M3 - Artículo de la conferencia
AN - SCOPUS:85077018900
VL - 1386
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012035
Y2 - 28 May 2019 through 31 May 2019
ER -