title: Application of granular activated carbon/MnFe₂O₄ composite immobilized on C. glutamicum MTCC 2745 to remove As(III) and As(V): Kinetic, mechanistic and thermodynamic studies.
abstract: The main objective of the present study was to investigate the efficiency of Corynebacterium glutamicum MTCC 2745 immobilized on granular activated carbon/MnFe2O4 (GAC/MnFe2O4) composite to treat high concentration of arsenic bearing wastewater. Non-linear regression analysis was done for determining the best-fit kinetic model on the basis of three correlation coefficients and three error functions and also for predicting the parameters involved in kinetic models. The results showed that Fractal-like mixed 1,2 order model for As(III) and Brouser-Weron-Sototlongo as well as Fractal-like pseudo second order models for As(V) were proficient to provide realistic description of biosorption/bioaccumulation kinetic. Applicability of mechanistic models in the current study exhibited that the rate governing step in biosorption/bioaccumulation of both As(III) and As(V) was film diffusion rather than intraparticle diffusion. The evaluated thermodynamic parameters ΔG(0), ΔH(0) and ΔS(0) revealed that biosorption/bioaccumulation of both As(III) and As(V) was feasible, spontaneous and exothermic under studied conditions.
authors: Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee 247667, India. Electronic address: mou.chem11@gmail.com.
authors: M S
authors: MS
authors: Podder
authors: Department of Chemical Engineering, Indian Institute of Technology, Roorkee, Roorkee 247667, India. Electronic address: cbmajumder@gmail.com.
authors: C B
authors: CB
authors: Majumder
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000302:isolation & purification*; D001673:Biodegradation, Environmental; D002606:Charcoal / Q000737:chemistry*; D003352:Corynebacterium / Q000378:metabolism*; D004058:Diffusion; D005290:Ferric Compounds / Q000737:chemistry*; D007700:Kinetics; D017895:Manganese Compounds / Q000737:chemistry*; D017711:Nonlinear Dynamics; D012044:Regression Analysis; D013052:Spectrometry, X-Ray Emission; D013816:Thermodynamics; D013997:Time Factors
chemical_list: D005290:Ferric Compounds; D017895:Manganese Compounds; C551151:manganese ferrite; D002606:Charcoal; D001151:Arsenic
keywords: Arsenic; Kinetic; Mechanistic; Simultaneous biosorption and bioaccumulation; Thermodynamic; Wastewater