Decolorization and detoxification of malachite green by Ganoderma lucidum: Key operating parameters and adsorption studies

Edwin D. Morales-Álvarez, Claudia M. Rivera-Hoyos, Laura E. Chaparro-Núñez, Carlos E. Daza, Raúl A. Poutou-Piñales, Aura M. Pedroza-Rodríguez

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18 Scopus citations

Abstract

Ganoderma lucidum's potential to decolorize and detoxify malachite green (MG) was studied. A Plackett-Burman experimental design to select operational factors and conditions favoring decolorization associated with laccase activity was performed. The most influential variables based on this statistical optimization were temperature, rpm for flask agitation, inoculum percentage, and dye concentration. Based on these features, removal experiments for 96 h were performed. Following thr 96-h removal assays, it was demonstrated that viable biomass at different glucose concentrations was able to remove over 90% MG at a 10 mg/L concentration, evidencing a positive correlation with laccase activity. Adsoprtion studies allowed to evidence acid pHs favored MG adsorption, with the Elovich model best describing the chimioadsorption phenomenon. Finally, it was demonstrated that MG (10 mgL-1) without treatment was highly toxic for Lactuca sativa seed germination index (GI) (<50%). This index increased when seeds were exposed to MG solution after it was treated with G. lucidum viable biomass (VB).

Original languageEnglish
Article number04016093
JournalJournal of Environmental Engineering (United States)
Volume143
Issue number4
DOIs
StatePublished - 01 Apr 2017

Keywords

  • Decolorization
  • Ganoderma lucidum
  • Laccase
  • Malachite green
  • Toxicity

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