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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

504
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...
504

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Related Experiment Video

Updated: Aug 10, 2025

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Highly Efficient Cd2+ Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution.

Juan Qin1, Sujuan Yuan1, Mauricio Córdova-Udaeta2

  • 1School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China.

Materials (Basel, Switzerland)
|February 11, 2023
PubMed
Summary
This summary is machine-generated.

This study synthesized tobermorite to remove toxic cadmium (Cd2+) from water. The material effectively adsorbed 99.71% of cadmium, demonstrating its potential for heavy metal remediation.

Keywords:
adsorptioncadmiumcalciumpH self-adjustmenttobermorite

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemistry

Background:

  • Cadmium (Cd) is a toxic heavy metal pollutant.
  • Cd exposure, even at low concentrations, is linked to various diseases.
  • Effective methods for cadmium removal from aqueous solutions are crucial for environmental protection.

Purpose of the Study:

  • To synthesize tobermorite for adsorbing cadmium ions (Cd2+) from aqueous solutions.
  • To investigate the physicochemical properties of the synthesized tobermorite.
  • To evaluate the efficiency and capacity of tobermorite in removing Cd2+.

Main Methods:

  • Hydrothermal synthesis of tobermorite.
  • Characterization of tobermorite's physicochemical properties, including surface area and porosity.
  • Batch experiments to study the effects of various factors on Cd2+ adsorption.
  • Adsorption isotherm and kinetic modeling (Langmuir, pseudo-second-order).

Main Results:

  • Synthesized tobermorite exhibited a high specific surface area (140.92 m2/g) and mesoporosity.
  • Tobermorite demonstrated a pH self-adjustment ability, maintaining an alkaline environment.
  • Achieved 99.71% Cd2+ removal efficiency and a maximum adsorption capacity of 39.18 mg/g.
  • Adsorption followed pseudo-second-order kinetics and Langmuir isotherm models.

Conclusions:

  • Hydrothermally synthesized tobermorite is a highly effective adsorbent for cadmium removal.
  • The material's properties, including pH self-adjustment and large surface area, contribute to its efficiency.
  • Surface complexation and ion exchange are the primary mechanisms for Cd2+ adsorption by tobermorite.