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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
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Related Experiment Video

Updated: May 14, 2026

Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for Cu(II) Through Microwave Pre-Pyrolysis
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One-Step Preparation of Ion-Exchangeable Biochar for Enhanced Pb (II) Adsorption.

Zhangshuai Ding1, Hao Sun1, Yujia Wu1

  • 1National Joint Engineering Research Center for Highly-Efficient Utilization Technology of Forest Biomass Resources, Southwest Forestry University, Kunming 650224, China.

Molecules (Basel, Switzerland)
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

This study developed a cost-effective one-step method to create biochar from agricultural waste for removing lead (Pb(II)) from water. Rape straw biochar showed the highest adsorption capacity, offering a promising solution for heavy metal remediation.

Keywords:
adsorptionagricultural and forestry wastebiocharleadpyrolysis

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Lead (Pb(II)) contamination in drinking water poses significant risks to human health.
  • Physical adsorption is an effective method for removing Pb(II) from water.
  • Biochar derived from waste materials offers a sustainable approach to water remediation.

Purpose of the Study:

  • To develop a simple, cost-effective one-step method for producing biochar from agricultural and forestry wastes.
  • To evaluate the Pb(II) adsorption performance of biochar derived from rape straw, bagasse, and walnut shell.
  • To investigate the adsorption mechanisms and the role of KHCO3 in enhancing biochar properties.

Main Methods:

  • Three types of biochar were produced using a one-step co-carbonization process with agricultural wastes (rape straw, bagasse, walnut shell) and KHCO3.
  • The Pb(II) adsorption capacity of the synthesized biochar was measured.
  • Adsorption mechanisms were analyzed using techniques including ion exchange, physical adsorption, coprecipitation, and electrostatic attraction.

Main Results:

  • All synthesized biochar types demonstrated significant Pb(II) adsorption capacities.
  • Bagasse-derived biochar reached 76.94 mg/g, walnut shell-derived biochar reached 124.90 mg/g.
  • Rape straw-derived biochar exhibited the highest adsorption capacity, up to 265.69 mg/g.
  • The one-step process using KHCO3 increased biochar's specific surface area and microporosity, enhancing Pb(II) removal.

Conclusions:

  • The one-step co-carbonization method using KHCO3 is efficient and cost-effective for producing high-performance biochar for Pb(II) removal.
  • Rape straw biochar shows exceptional potential for remediating Pb(II) contamination in water.
  • This approach offers a sustainable and practical solution for heavy metal remediation in natural water bodies.