title: Defatted algal biomass as a non-conventional low-cost adsorbent: surface characterization and methylene blue adsorption characteristics.
abstract: The present study investigates the use of defatted algal biomass (DAB) as a non-conventional low cost adsorbent. The maximum adsorption capacity of biomass (raw, defatted and sulfuric acid pretreated DAB) was determined by liquid phase adsorption studies in batch mode for the removal of methylene blue present at various concentrations (1, 2, 3, 4, and 5 mg L(-1)) from aqueous solutions. The data was well fitted with Langmuir and Freundlich isotherms. The maximum adsorption capacity for raw, defatted and sulfuric acid pretreated DAB was found to be 6.0, 7.73 and 7.80 mg g(-1), respectively. The specific surface area of raw, defatted and sulfuric acid pretreated DAB was estimated to be 14.70, 18.94, and 19.10 m(2) g(-1), respectively. To evaluate the kinetic mechanism that controls the adsorption process, pseudo-first order, pseudo-second order, intraparticle diffusion and particle diffusion has been tested. The data fitted quite well with pseudo-second order kinetic model.
authors.affiliation: Environmental Biotechnology Division, CSIR-National Environmental Engineering Research Institute, Nagpur, Maharashtra, India; Centre for Environmental Science and Engineering, Indian Institute of Technology Bombay, Mumbai, Maharashtra, India; Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore, Karnataka, India.
authors.forename: T
authors.initials: T
authors.lastname: Sarat Chandra
authors.affiliation: Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore, Karnataka, India.
authors.forename: S N
authors.initials: SN
authors.lastname: Mudliar
authors.affiliation: Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore, Karnataka, India.
authors.forename: S
authors.initials: S
authors.lastname: Vidyashankar
authors.affiliation: Centre for Environmental Science and Engineering, Indian Institute of Technology Bombay, Mumbai, Maharashtra, India.
authors.forename: S
authors.initials: S
authors.lastname: Mukherji
authors.affiliation: Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore, Karnataka, India.
authors.forename: R
authors.initials: R
authors.lastname: Sarada
authors.affiliation: Environmental Health Division, CSIR-National Environmental Engineering Research Institute, Nagpur, Maharashtra, India.
authors.forename: K
authors.initials: K
authors.lastname: Krishnamurthi
authors.affiliation: Plant Cell Biotechnology Department, CSIR-Central Food Technological Research Institute, Mysore, Karnataka, India. Electronic address: vikas@cftri.res.in.
authors.forename: V S
authors.initials: VS
authors.lastname: Chauhan
mesh_terms: D000327:Adsorption; D018533:Biomass; D003365:Costs and Cost Analysis; D004058:Diffusion; D005227:Fatty Acids / Q000302:isolation & purification*; D007700:Kinetics; D008751:Methylene Blue / Q000302:isolation & purification*; D008962:Models, Theoretical; D044444:Scenedesmus / Q000187:drug effects / Q000378:metabolism*; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013464:Sulfuric Acids / Q000494:pharmacology; D013499:Surface Properties; D013696:Temperature
chemical_list: D005227:Fatty Acids; D012996:Solutions; D013464:Sulfuric Acids; C033158:sulfuric acid; D008751:Methylene Blue
keywords: Defatted algal biomass; Kinetics; Langmuir and Freundlich adsorption isotherm; Methylene blue; Specific surface area