Carnauba straw powder treated with bentonite for copper adsorption in aqueous solution: isothermal, kinetic and thermodynamic study

In this work, the natural and modified carnauba powder from the addition of bentonite was evaluated for the adsorption of Cu(II) ions in synthetic solution. The results showed that the carnauba powder treated with bentonite (CPTB) showed a better percentage of removal of Cu(II) ions when compared to...

Full description

Saved in:
Bibliographic Details
Published in:Water science and technology 2020-11, Vol.82 (10), p.2178-2192
Main Authors: Pereira, Jéssyca E S, Silva, Alfredo J F, Nascimento, Paula F P, Ferreira, Ruan L S, Barros Neto, Eduardo L
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aqueous solutions
Bentonite
Copper
Effluents
Environmental impact
Heavy metals
Hydrogen-Ion Concentration
Ions
Kinetics
Metals
Pore size
Powder
Powders
Removal
Thermodynamics
Water Pollutants, Chemical - analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this work, the natural and modified carnauba powder from the addition of bentonite was evaluated for the adsorption of Cu(II) ions in synthetic solution. The results showed that the carnauba powder treated with bentonite (CPTB) showed a better percentage of removal of Cu(II) ions when compared to natural carnauba powder (NCP). The best results for both adsorbents were obtained with pH 5. The adsorption kinetics was governed by the pseudo-second-order model for both bioadsorbents studied. While the isothermal behavior was governed by the Langmuir model and showed that the adsorption capacity of the CPTB for Cu(II) was 21.98 mg·g . The interaction of the metal and CPTB was also investigated by means of thermodynamic parameters showing that the adsorption process is not spontaneous, although the values of ΔG° decrease with the increase in temperature from 20 to 40 °C and endothermic causing an increase in the degree of disorder at the solid/liquid interface. The results showed that the CPTB is a material with potential adsorbent for the removal of copper ions.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2020.491