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Gold binding by native and chemically modified hops biomasses.

M Laura López1, J L Gardea-Torresdey, J R Peralta-Videa

  • 1Chemistry Department, University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, USA.

Bioinorganic Chemistry and Applications
|March 28, 2008
PubMed
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Cone hops biomass effectively recovers gold from wastewater. This study explored hops biomass for gold extraction, finding optimal pH and binding capacities for various modifications, offering a sustainable solution for gold recovery.

Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Industrial wastewaters globally are contaminated with heavy metals from mining and smelting.
  • Efficient metal extraction from effluents is crucial for economic and environmental reasons.
  • There is a growing need for novel methods to recover precious metals like gold.

Purpose of the Study:

  • To investigate the potential of cone hops biomass (Humulus lupulus) as a biosorbent for gold recovery.
  • To evaluate the influence of pH and time on gold binding by hops biomass.
  • To determine the gold binding capacity of native and modified hops biomass.

Main Methods:

  • Biosorption experiments using native, esterified, and hydrolyzed cone hops biomass.
  • Varying pH conditions (pH 2-6) and contact times to assess gold binding.
Keywords:
Au nanoparticlesAu recoveryHopschemical modificationmetal binding

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  • Analysis of gold concentration in the effluent to determine binding efficiency and capacity.

    • Main Results:

    • Gold binding to native hops biomass was pH-dependent, with maximum binding at pH 3.
    • Au(III) binding was time-independent at pH 2 but time-dependent at pH 5.
    • At pH 2, esterified hops biomass showed the highest capacity (33.4 mg Au/g), while at pH 5, native hops biomass exhibited the highest capacity (38.9 mg Au/g).

    Conclusions:

    • Cone hops biomass is a promising material for gold recovery from aqueous solutions.
    • The efficiency of gold recovery is significantly influenced by pH and biomass modification.
    • Hops biomass offers a potentially sustainable and cost-effective alternative for gold remediation from industrial effluents.