Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration

This study investigates the potential use of activated carbon prepared from coffee waste (CW) as an adsorbent for the removal of congo red dye from aqueous solution. The oxygen-containing groups of activated carbon prepared from CW play an important role in dyes ions adsorption onto activated carbon...

Full description

Bibliographic Details
Main Authors: Ridha Lafi, Imed Montasser, Amor Hafiane
Format: Article
Language:English
Published: Hindawi - SAGE Publishing 2019-03-01
Series:Adsorption Science & Technology
Online Access:https://doi.org/10.1177/0263617418819227
id doaj-b243b79d4b7f408d9fb149c40868bc31
record_format Article
spelling doaj-b243b79d4b7f408d9fb149c40868bc312021-04-02T13:32:45ZengHindawi - SAGE PublishingAdsorption Science & Technology0263-61742048-40382019-03-013710.1177/0263617418819227Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regenerationRidha LafiImed MontasserAmor HafianeThis study investigates the potential use of activated carbon prepared from coffee waste (CW) as an adsorbent for the removal of congo red dye from aqueous solution. The oxygen-containing groups of activated carbon prepared from CW play an important role in dyes ions adsorption onto activated carbon prepared from CW. The activated carbon is characterized by scanning electron microscopy and Fourier transform infrared (FTIR) spectroscopy. Adsorption experiments were carried out as batch studies at different contact time, pH, and initial dye concentration. The dye adsorption equilibrium was attained after 120 min of contact time. Removal of dye in acidic solutions was better than in basic solutions. The adsorption of dye increased with increasing initial dye concentration. The equilibrium data were revealed that Langmuir model was more suitable to describe the congo red adsorption and demonstrated excellent reusability potential with desorption greater than 90% throughout six consecutive adsorption–desorption cycles. Experimental data founded that kinetics followed a pseudo-second-order equation. Thermodynamic study showed that the adsorption was a spontaneous and exothermic process. According to the FTIR analyses, hydrogen bonding and electrostatic interactions between dyes and oxygen-containing functional groups on activated carbon prepared from CW are dominant mechanisms for dye adsorption.https://doi.org/10.1177/0263617418819227
collection DOAJ
language English
format Article
sources DOAJ
author Ridha Lafi
Imed Montasser
Amor Hafiane
spellingShingle Ridha Lafi
Imed Montasser
Amor Hafiane
Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration
Adsorption Science & Technology
author_facet Ridha Lafi
Imed Montasser
Amor Hafiane
author_sort Ridha Lafi
title Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration
title_short Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration
title_full Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration
title_fullStr Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration
title_full_unstemmed Adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration
title_sort adsorption of congo red dye from aqueous solutions by prepared activated carbon with oxygen-containing functional groups and its regeneration
publisher Hindawi - SAGE Publishing
series Adsorption Science & Technology
issn 0263-6174
2048-4038
publishDate 2019-03-01
description This study investigates the potential use of activated carbon prepared from coffee waste (CW) as an adsorbent for the removal of congo red dye from aqueous solution. The oxygen-containing groups of activated carbon prepared from CW play an important role in dyes ions adsorption onto activated carbon prepared from CW. The activated carbon is characterized by scanning electron microscopy and Fourier transform infrared (FTIR) spectroscopy. Adsorption experiments were carried out as batch studies at different contact time, pH, and initial dye concentration. The dye adsorption equilibrium was attained after 120 min of contact time. Removal of dye in acidic solutions was better than in basic solutions. The adsorption of dye increased with increasing initial dye concentration. The equilibrium data were revealed that Langmuir model was more suitable to describe the congo red adsorption and demonstrated excellent reusability potential with desorption greater than 90% throughout six consecutive adsorption–desorption cycles. Experimental data founded that kinetics followed a pseudo-second-order equation. Thermodynamic study showed that the adsorption was a spontaneous and exothermic process. According to the FTIR analyses, hydrogen bonding and electrostatic interactions between dyes and oxygen-containing functional groups on activated carbon prepared from CW are dominant mechanisms for dye adsorption.
url https://doi.org/10.1177/0263617418819227
work_keys_str_mv AT ridhalafi adsorptionofcongoreddyefromaqueoussolutionsbypreparedactivatedcarbonwithoxygencontainingfunctionalgroupsanditsregeneration
AT imedmontasser adsorptionofcongoreddyefromaqueoussolutionsbypreparedactivatedcarbonwithoxygencontainingfunctionalgroupsanditsregeneration
AT amorhafiane adsorptionofcongoreddyefromaqueoussolutionsbypreparedactivatedcarbonwithoxygencontainingfunctionalgroupsanditsregeneration
_version_ 1721564618346725376