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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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...
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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Precipitation of Ions03:11

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Colloidal precipitates01:09

Colloidal precipitates

3.0K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

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Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
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Updated: Nov 25, 2025

A Dual-Functional Electroactive Filter Towards Simultaneously SbIII Oxidation and Sequestration
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Selective adsorption of lead(II) from aqueous solution.

Viet Anh Hoang1, Syouhei Nishihama1, Kazuharu Yoshizuka1

  • 1Department of Chemical Engineering, Faculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu, Japan.

Environmental Technology
|December 17, 2020
PubMed
Summary

This study explores heavy metal removal using chelating resin CR11 and iron-based adsorbents (goethite, magnetite). Magnetite shows selective adsorption for lead (Pb(II)), enabling potential chromatographic separation.

Keywords:
AdsorptionFe-based adsorbentchelating resinlead(II)separation

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Area of Science:

  • Environmental Science
  • Materials Science
  • Analytical Chemistry

Background:

  • Heavy metal contamination in aqueous solutions poses significant environmental and health risks.
  • Effective separation and removal of toxic metals like lead (Pb(II)), copper (Cu(II)), zinc (Zn(II)), and cadmium (Cd(II)) are crucial.
  • Adsorptive separation offers a promising method for remediating contaminated water.

Purpose of the Study:

  • To investigate the adsorptive separation of Pb(II) from multi-metal aqueous solutions.
  • To evaluate the performance of iminodiacetic acid-chelating resin (CR11), goethite, and magnetite as adsorbents.
  • To assess the selectivity and kinetics of metal ion adsorption.

Main Methods:

  • Batchwise adsorption experiments were conducted using CR11, goethite, and magnetite.
  • Adsorption was studied in single and multi-component metal systems.
  • Parameters such as pH, time, and initial metal concentrations were varied.

Main Results:

  • CR11 exhibited the highest adsorption capacity but limited selectivity.
  • Goethite showed selectivity for Pb(II) and Cu(II); magnetite demonstrated selectivity for Pb(II).
  • Adsorption kinetics followed a pseudo-second-order model, with magnetite displaying the fastest kinetics.

Conclusions:

  • All three adsorbents show potential for chromatographic separation of heavy metals.
  • Magnetite is particularly feasible for selective Pb(II) separation, despite incomplete elution.
  • The choice of adsorbent depends on the specific separation requirements and target metals.