Cd(II) biosorption using bacterial isolates from sawdust : optimization via orthogonal array Taguchi method

Orthogonal array of Taguchi experimental design with L16 four-level factors: pH (2-8), temperature (303-333 K), time (1-4 h), inoculum concentration (5-20 v/v) and Cd(II) initial concentration (50-200 mg/L) was applied to optimize Cd(II) biosorption from aqueous solution via bacterial isolates from...

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Bibliographic Details
Published in:Water S. A. 2020-10, Vol.46 (4), p.627-637
Main Authors: Popoola, Lekan Taofeek, Yusuff, Adeyinka Sikiru, Adeoye, Babatunde Kazeem, Aderibigbe, Tajudeen Adejare
Format: Article
Language:English
Subjects:
Aqueous solution
Aqueous solutions
Bacteria
Bacterial isolates
Bioremediation
Biosorption
Cadmium
Design of experiments
Electron microscopy
Electrostatic properties
Experimental design
Fourier analysis
Fourier transforms
Heavy metals
Inoculum
Investigations
Ion exchange
Methods
Motility
Multilayers
Nitrates
Optimization
Orthogonal arrays
pH effects
Removal
Sawdust
Scanning electron microscopy
Taguchi methods
Temperature
Variance analysis
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Summary:Orthogonal array of Taguchi experimental design with L16 four-level factors: pH (2-8), temperature (303-333 K), time (1-4 h), inoculum concentration (5-20 v/v) and Cd(II) initial concentration (50-200 mg/L) was applied to optimize Cd(II) biosorption from aqueous solution via bacterial isolates from sawdust. The optimum conditions were found to be 4, 303 K, 4 h, 15 v/v % and 50 mg/L for pH, temperature, time, inoculum concentration and Cd(II) initial concentration, respectively. A confirmatory experimental run at these conditions revealed 99.53% Cd(II) removal. Fourier transform infrared revealed the presence of -OH on the bacterial surface enhancing Cd(II) biosorption. The presence of small cavities on the bacterial surface with a porous inner multilayer was shown by scanning electron microscopy analysis. Proposed biosorption mechanisms were electrostatic interaction, surface complexation and ion exchange. In conclusion, bacterial isolates from sawdust could efectively be applied as biosorbent for Cd(II) removal from aqueous solution.
ISSN:0378-4738
1816-7950
DOI:10.17159/wsa/2020.v46.i4.9076