Process optimization using response surface methodology for the removal of thorium from aqueous solutions using rice-husk

Varala, S, Ravisankar, V, Al-Ali, M, Pownceby, M, Parthasarathy, R and Bhargava, S 2019, 'Process optimization using response surface methodology for the removal of thorium from aqueous solutions using rice-husk', Chemosphere, vol. 237, pp. 1-9.


Document type: Journal Article
Collection: Journal Articles

Title Process optimization using response surface methodology for the removal of thorium from aqueous solutions using rice-husk
Author(s) Varala, S
Ravisankar, V
Al-Ali, M
Pownceby, M
Parthasarathy, R
Bhargava, S
Year 2019
Journal name Chemosphere
Volume number 237
Start page 1
End page 9
Total pages 9
Publisher Elsevier Ltd
Abstract The adsorptive capability of rice-husk for the sorption of thorium ions from aqueous solutions in batch mode was studied. The key process variables (initial metal ion concentration, initial solution pH and S/L (solid-to-liquid ratio) were optimized for achieving maximum bioremoval efficiency (B%) by employing the Box-Behnken design (33) in response surface methodology (RSM). A quadratic model developed by fitting the experimental data predicted 93% of the responses and estimated the local maximum of B% as >99% for an initial ThIV concentration of 150 g/L, S/L ratio of 5, and an initial pH of 4, and the reported biosorption capacity (qe) is 15.95 mg/g for the same conditions. Freundlich isotherm (R2 = 0.9841) and pseudo-first-order (R2 = 0.9416) kinetic models had the best concurrence with the experimental data in the thorium concentration range used implying the sorption mechanism involves surface biosorption and intraparticle diffusion.
Subject Wastewater Treatment Processes
Membrane and Separation Technologies
Keyword(s) Biosorption
Optimization
Radionuclide
Rice-husk
RSM
Thorium
DOI - identifier 10.1016/j.chemosphere.2019.124488
Copyright notice © 2019 Published by Elsevier Ltd.
ISSN 0045-6535
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