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Copper accumulation by Aspergillus awamori.

K V Tsekova1, P G Marinov, A N Tzekova

  • 1Institute of Microbiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.

Folia Microbiologica
|March 29, 2001
PubMed
Summary

Aspergillus awamori efficiently removes copper ions (Cu2+) from water, with uptake depending on concentration. This biosorption process follows Langmuir and Freundlich models, indicating a saturable chemical mechanism.

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Area of Science:

  • Environmental microbiology
  • Bioremediation
  • Metal ion sorption

Background:

  • Copper (Cu2+) contamination in aqueous solutions poses environmental and health risks.
  • Bioremediation using microorganisms is a sustainable approach for heavy metal removal.
  • Understanding the sorption mechanisms of fungi like Aspergillus awamori is crucial for effective copper remediation.

Purpose of the Study:

  • To investigate the capability of Aspergillus awamori for copper ion (Cu2+) accumulation from aqueous solutions.
  • To determine the factors influencing copper uptake, including initial metal concentration.
  • To elucidate the sorption mechanism and kinetics of copper by Aspergillus awamori.

Main Methods:

  • Batch experiments were conducted to study copper (Cu2+) sorption by Aspergillus awamori.
  • Copper uptake was measured at varying initial metal concentrations.
  • Sorption data were analyzed using Langmuir and Freundlich isotherm models to describe the equilibrium.
  • Kinetic analysis was performed to determine the reaction rate constants.

Main Results:

  • Aspergillus awamori demonstrated significant accumulation of Cu2+ from aqueous solutions.
  • Copper uptake was directly dependent on the ambient Cu2+ concentration.
  • The sorption process exhibited a two-phase behavior: a rapid initial phase followed by a slower secondary phase.
  • The Langmuir model provided a better fit than the Freundlich model, suggesting a chemically controlled, saturable sorption mechanism.
  • Kinetic constants for the sorption reaction were successfully calculated.

Conclusions:

  • Aspergillus awamori is an effective biosorbent for removing copper ions (Cu2+) from contaminated water.
  • The biosorption process is concentration-dependent and follows Langmuir isotherm characteristics, indicating monolayer sorption on a limited number of active sites.
  • The findings provide valuable kinetic and mechanistic insights for designing Aspergillus awamori-based copper remediation strategies.

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