The Biosorption Features of Cr (VI) Ions by Dried Biomass of a Facultative Anaerobic Bacillus cereus Strain Pf-1 | Chapter 05 | Current Research in Science and Technology Vol. 3
Many studies were undertaken on the
biosorption potential of different kinds of biomaterials. However, there is a
paucity of data regarding the biosorption mechanism of Cr (VI) using dried
cells. In our study, the removal of Cr (VI) from aqueous solution was
investigated in a batch system by the dried biomass of Bacillus cereus Pf-1
isolated from activated sludge samples. Equilibrium and kinetic experiments
were undertaken at various initial metal concentration, pH, and biosorbent
dosage. Energy-Dispersive X-ray (EDX), Scanning Electron Microscope (SEM) and
Fourier Transform Infrared Spectroscopy (FTIR) were used to characterize the
biomass. Biosorption process was found to be pH dependent. The optimum pH was
found to be 2.0. The Langmuir and Freundlich were considered to identify the
isotherm that could better describe the equilibrium adsorption of Cr (VI) onto
the biomass. Langmuir and Freundlich models fitted our experimental data. The
suitability of the pseudo-first order and pseudo-second order kinetic models
for the biosorption of Cr (VI) onto Bacillus cereus was also performed. The
mechanism for the adsorption was studied by fitting the kinetic data with the
Boyd plot and intra-particle diffusion model. External mass transfer was found
to be the rate-determining step. Based on the ionic nature of the metal, the
intra-particle diffusion and extent of film diffusion varied.
Author(s) Details
Dr. Paul Fabrice Nguema
Faculty of Agronomy and
Agricultural Science, School of Wood, Water and Natural Resources, University
of Dschang, P.O.Box 786, Ebolowa, Cameroon.
Professor Zejiao Luo
State Key Laboratory of
Biogeology and Environmental Geology, Ministry of Education, School of
Environmental Studies, China University of Geosciences, 388 Lumo lu, Wuhan
430074, China.
Zachari Mohamadou Mounir
Departement Hygiene Securite
Environnement, Institut Universitaire de Technologie, Universite de Zinder, Bp
656, Zinder, Niger.
Dr. Lian Jing Jing
State Key Laboratory of
Biogeology and Environmental Geology, Ministry of Education, School of
Environmental Studies, China University of Geosciences, 388 Lumo lu, Wuhan
430074, China.
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