title: Biosorptive uptake of Fe(2+), Cu(2+) and As(5+) by activated biochar derived from Colocasia esculenta: Isotherm, kinetics, thermodynamics, and cost estimation.
abstract: The adsorptive capability of superheated steam activated biochar (SSAB) produced from Colocasia esculenta was investigated for removal of Cu(2+), Fe(2+) and As(5+) from simulated coal mine wastewater. SSAB was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and Brunauer-Emmett-Teller analyser. Adsorption isotherm indicated monolayer adsorption which fitted best in Langmuir isotherm model. Thermodynamic study suggested the removal process to be exothermic, feasible and spontaneous in nature. Adsorption of Fe(2+), Cu(2+) and As(5+) on to SSAB was found to be governed by pseudo-second order kinetic model. Efficacy of SSAB in terms of metal desorption, regeneration and reusability for multiple cycles was studied. Regeneration of metal desorbed SSAB with 1 N sodium hydroxide maintained its effectiveness towards multiple metal adsorption cycles. Cost estimation of SSAB production substantiated its cost effectiveness as compared to commercially available activated carbon. Hence, SSAB could be a promising adsorbent for metal ions removal from aqueous solution.
authors.affiliation: Department of Chemical Engg, National Institute of Technology Durgapur, West Bengal, India.
authors.forename: Soumya
authors.initials: S
authors.lastname: Banerjee
authors.affiliation: Department of Chemical Engg, National Institute of Technology Durgapur, West Bengal, India.
authors.forename: Shraboni
authors.initials: S
authors.lastname: Mukherjee
authors.affiliation: Department of Biotechnology and Bioinformatics, North-Eastern Hill University, Shillong, India.
authors.forename: Augustine
authors.initials: A
authors.lastname: LaminKa-Ot
authors.affiliation: Department of Biotechnology and Bioinformatics, North-Eastern Hill University, Shillong, India.
authors.forename: S R
authors.initials: SR
authors.lastname: Joshi
authors.affiliation: Department of Chemical Engg, National Institute of Technology Durgapur, West Bengal, India.
authors.forename: Tamal
authors.initials: T
authors.lastname: Mandal
authors.affiliation: Department of Chemical Engg, National Institute of Technology Durgapur, West Bengal, India.
authors.forename: Gopinath
authors.initials: G
authors.lastname: Halder
keywords: Activated biochar; Adsorption; Cost estimation; Desorption; Metal removal; Regeneration