TY - JOUR
T1 - Kinetic study of the effect of pH on hexavalent and trivalent chromium removal from aqueous solution by Cupressus lusitanica bark
AU - Netzahuatl-Muñoz, Alma Rosa
AU - Guillén-Jiménez, Flor De María
AU - Chávez-Gómez, Benjamín
AU - Villegas-Garrido, Thelma Lilia
AU - Cristiani-Urbina, Eliseo
N1 - Funding Information:
A.R.Netzahuatl-Muñoz.F.d.M.Guillén-Jiménez. E. Cristiani-Urbina (*) Departamento de Ingeniería Bioquímica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Colonia Santo Tomás, Mexico, DF 11340, Mexico e-mail: ecristia@encb.ipn.mx B. Chávez-Gómez Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas No. 152, Colonia San Bartolo Atepehuacan, Mexico, DF 07730, Mexico
PY - 2012/2
Y1 - 2012/2
N2 - Solution pH is among the most important parameters that influence heavy metal biosorption. This work presents a kinetic study of the effects of pH on chromium biosorption onto Cupressus lusitanica Mill bark from aqueous Cr(VI) or Cr(III) solutions and proposes a mechanism of adsorption. At all assayed contact times, the optimum pH for chromium biosorption from the Cr(III) solution was 5.0; in contrast, optimum pH for chromium biosorption from the Cr(VI) solution varied depending on contact time. The kinetic models that satisfactorily described the chromium biosorption processes from the Cr(III) and Cr (VI) solutions were the Elovich and pseudo second-order models, respectively. Diffuse reflectance infrared Fourier transform spectroscopy studies suggest that phenolic compounds present on C. lusitanica Mill bark play an important role in chromium biosorption from the Cr(III) solution. On the other hand, chromium biosorption from the Cr(VI) solution involved carboxyl groups produced on the bark by redox reactions between oxygen-containing groups and Cr(VI), and these were in turn responsible for the biosorption of Cr (III) produced by Cr(VI) reduction.
AB - Solution pH is among the most important parameters that influence heavy metal biosorption. This work presents a kinetic study of the effects of pH on chromium biosorption onto Cupressus lusitanica Mill bark from aqueous Cr(VI) or Cr(III) solutions and proposes a mechanism of adsorption. At all assayed contact times, the optimum pH for chromium biosorption from the Cr(III) solution was 5.0; in contrast, optimum pH for chromium biosorption from the Cr(VI) solution varied depending on contact time. The kinetic models that satisfactorily described the chromium biosorption processes from the Cr(III) and Cr (VI) solutions were the Elovich and pseudo second-order models, respectively. Diffuse reflectance infrared Fourier transform spectroscopy studies suggest that phenolic compounds present on C. lusitanica Mill bark play an important role in chromium biosorption from the Cr(III) solution. On the other hand, chromium biosorption from the Cr(VI) solution involved carboxyl groups produced on the bark by redox reactions between oxygen-containing groups and Cr(VI), and these were in turn responsible for the biosorption of Cr (III) produced by Cr(VI) reduction.
KW - Bark
KW - Chromium biosorption
KW - Cupressus lusitanica Mill
KW - DRIFTS
KW - Kinetic models
KW - pH
UR - http://www.scopus.com/inward/record.url?scp=84856547874&partnerID=8YFLogxK
U2 - 10.1007/s11270-011-0888-4
DO - 10.1007/s11270-011-0888-4
M3 - Artículo
SN - 0049-6979
VL - 223
SP - 625
EP - 641
JO - Water, Air, and Soil Pollution
JF - Water, Air, and Soil Pollution
IS - 2
ER -