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Integrated Field Lysimetry and Porewater Sampling for Evaluation of Chemical Mobility in Soils and Established Vegetation

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Published on: July 4, 2014

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

J Gardea-Torresdey¹, M Hejazi, K Tiemann

¹Department of Chemistry and Environmental Science and Engineering, The University of Texas at El Paso, El Paso, TX 79968-0513, USA. gardea@utep.edu

Journal of Hazardous Materials

|March 20, 2002

Summary

Agricultural hop waste effectively removes toxic lead(II) ions from water. This study highlights hop leaves and stems as a sustainable biosorbent for heavy metal remediation, offering a cost-effective solution for water purification.

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Published on: August 18, 2023

Area of Science:

Environmental Science
Biotechnology
Materials Science

Background:

Heavy metal contamination, particularly lead(II) ions, poses significant risks to aquatic ecosystems and human health.
Conventional methods for lead removal are often costly and inefficient, necessitating the development of sustainable alternatives.

Purpose of the Study:

To investigate the potential of agricultural by-products from the hop plant (Humulus lupulus L.) for lead(II) ion removal from contaminated water.
To optimize adsorption conditions and evaluate the binding capacity and mechanism of hop biomass for lead(II).

Main Methods:

Batch adsorption experiments were conducted to determine optimal pH, contact time, and binding capacity using dried and ground hop leaves and stems.
Silica-immobilized hop tissues were tested under flow conditions.
Comparison with ion-exchange resins and X-ray absorption spectroscopy were employed to elucidate the binding mechanism.

Main Results:

Optimal lead(II) binding occurred at pH 5.0, with rapid adsorption within the first 5 minutes.
Hop leaf biomass demonstrated a high binding capacity of 74.2 mg/g for lead(II) ions.
Carboxyl ligands were identified as key functional groups involved in lead(II) binding.

Conclusions:

Hop agricultural waste products are a viable and sustainable biosorbent for the removal and recovery of lead(II) ions from aqueous solutions.
The use of hop biomass offers a cost-effective and environmentally friendly approach to heavy metal remediation.