Original Paper

International Journal of Environmental Science and Technology

, Volume 10, Issue 3, pp 579-590

Biosorption of lead from acid solution using chitosan as a supporting material for spore forming-fungal biomass encapsulation

  • W. LangAffiliated withDepartment of Microbiology, Faculty of Liberal Arts and Science, Kasetsart UniversityLaboratory of Molecular Enzymology, Research Faculty of Agriculture, Hokkaido University Email author 
  • , W. BuranaboripanAffiliated withDepartment of Science, Faculty of Liberal Arts and Science, Kasetsart UniversityGraduate School of Environmental Science, Hokkaido University
  • , J. WongchawalitAffiliated withDepartment of Microbiology, Faculty of Liberal Arts and Science, Kasetsart University
  • , P. ParakulsuksatidAffiliated withDepartment of Biotechnology, Faculty of Agro-Industry, Kasetsart UniversityCenter for Advanced Studies in Tropical Natural Resources, National Research University-Kasetsart University, Kasetsart University
  • , W. VanichsriratanaAffiliated withDepartment of Biotechnology, Faculty of Agro-Industry, Kasetsart UniversityCenter for Advanced Studies in Tropical Natural Resources, National Research University-Kasetsart University, Kasetsart University
  • , N. SakairiAffiliated withGraduate School of Environmental Science, Hokkaido University
  • , W. Pathom-areeAffiliated withDepartment of Biology, Faculty of Science, Chiang Mai University
  • , S. SirisansaneeyakulAffiliated withDepartment of Biotechnology, Faculty of Agro-Industry, Kasetsart UniversityCenter for Advanced Studies in Tropical Natural Resources, National Research University-Kasetsart University, Kasetsart University

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Abstract

Asexual spores of the filamentous fungus Rhizopus arrhizus were used as the resting biomass as they tolerate chitosan gelling for mycelia growing in chitosan beads. Biosorption of lead using the dead detergent pre-treated chitosan-immobilised and grown fungal beads was performed with initial lead (II) nitrate concentrations ranging from 9.02 to 281.65 mg/L. The adsorption data were best correlated with equilibrium adsorption isotherms in the order Redlich–Peterson, Langmuir, Freundlich and Fritz–Schlünder by non-linear regression. The biosorption kinetic model of pseudo second-order (R 2 > 0.99) fitted better than pseudo first-order and modified pseudo first-order models. Among the four pseudo second-order kinetic models, the Blanchard model was the best fit for the experimental biosorption data. The rate-limiting step of biosorption of lead was shown to be intraparticle diffusion controlled according to Weber and Morris model fitting. The beads could be regenerated using 1 M nitric acid solution. This illustrated the good performance of the beads for regenerated sorption/desorption at least five cycles.

Keywords

Adsorption kinetics Detergent Diffusion model Heavy metal Lead (II) Regeneration Rhizopus arrhizus