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Title: Gold Binding by Native and Chemically Modified Hops Biomasses

Heavy metals from mining, smelting operations and other industrial processing facilities pollute wastewaters worldwide. Extraction of metals from industrial effluents has been widely studied due to the economic advantages and the relative ease of technical implementation. Consequently, the search for new and improved methodologies for the recovery of gold has increased. In this particular research, the use of cone hops biomass ( Humulus lupulus ) was investigated as a new option for gold recovery. The results showed that the gold binding to native hops biomass was pH dependent from pH 2 to pH 6, with a maximum percentage binding at pH 3. Time dependency studies demonstrated that Au(III) binding to native and modified cone hops biomasses was found to be time independent at pH 2 while at pH 5, it was time dependent. Capacity experiments demonstrated that at pH 2, esterified hops biomass bound 33.4 mg Au/g of biomass, while native and hydrolyzed hops biomasses bound 28.2 and 12.0 mg Au/g of biomass, respectively. However, at pH 5 the binding capacities were 38.9, 37.8 and 11.4 mg of Au per gram of native, esterified and hydrolyzed hops biomasses, respectively.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [1] ;  [4] ;  [5]
  1. Chemistry Department, University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, USA
  2. Envtronmental Science and Engineering Ph.D. Program, University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, USA, Chemistry Department, University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, USA
  3. Envtronmental Science and Engineering Ph.D. Program, University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, USA
  4. Department of Chemical Engineering, University of Texas at Austin, Austin, TX 78712-1062, USA
  5. Department of Crop and Soil Science, United States Department of Agriculture—Agricultural Research Service, Oregon State University, Corvallis, OR 973311, USA
Publication Date:
OSTI Identifier:
1197936
Grant/Contract Number:
DEFC0401AL67097
Type:
Published Article
Journal Name:
Bioinorganic Chemistry and Applications
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1-2; Related Information: CHORUS Timestamp: 2016-08-23 11:51:03; Journal ID: ISSN 1565-3633
Publisher:
Hindawi Publishing Corporation
Sponsoring Org:
USDOE
Country of Publication:
Country unknown/Code not available
Language:
English