PMID: 11900908Mar 20, 2002Paper

Use of hop (Humulus lupulus) agricultural by-products for the reduction of aqueous lead(II) environmental health hazards

Journal of Hazardous Materials
Jorge L Gardea-TorresdeyJ Henning

Abstract

The agricultural by-products of the hop plant (Humulus lupulus L.) were investigated to determine their potential for use in the removal of heavy lead(II) ions from contaminated aqueous solutions. Separate batch laboratory experiments were performed to establish the optimal binding pH, time exposures, and capacity of the metal adsorption for lead(II) ions by dried and ground hop leaves and stems biomass. Results from these studies have shown a pH dependent binding trend from pH 2-6, with optimum binding occurring around pH 5.0. Time dependency experiments showed a rapid adsorption of lead(II) ions within the first 5 min of contact. Binding capacity experiments demonstrated that 74.2mg of lead(II) were bound per gram of leaf biomass. Similarly overall capacity was seen for the leaves and stems. Desorption of 99% of the bound lead(II) ions was achieved by exposing the metal laden biomass to 0.5M sodium citrate. Further experiments were performed with silica-immobilized hop tissues to determine the lead(II) binding ability under flow conditions. Comparison studies were performed with ion-exchange resins to evaluate the binding ability and to gain further insight into the metal binding mechanism. X-ray absorption spectroscopy exper...Continue Reading

References

May 1, 1979·Journal of Agricultural and Food Chemistry·S E Wallen, H F Marshall
Sep 30, 1999·Journal of Hazardous Materials·J L Gardea-TorresdeyK Dokken
Nov 26, 1999·Applied Microbiology and Biotechnology·R AshkenazyL Gottlieb

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Citations

Mar 23, 2013·Environmental Science & Technology·Gudrun L BovenkampJosef Hormes
Jul 2, 2010·Journal of Hazardous Materials·J Cruz-OlivaresP Balderas-Hernández
Sep 1, 2015·Environmental Science and Pollution Research International·Shalini SrivastavaM K Mondal

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