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Related Concept Videos

Factors Affecting Solubility04:01

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
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Phosphate adsorption on lanthanum loaded biochar.

Zhanghong Wang1, Dekui Shen2, Fei Shen3

  • 1Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, PR China; Institute of Ecological and Environmental Science, Sichuan Agricultural University, Sichuan 611130, PR China.

Chemosphere
|February 13, 2016
PubMed
Summary

Lanthanum-loaded biochar (La-BC) effectively removes phosphate from water. This low-cost adsorbent shows high efficiency and capacity, utilizing precipitation, ligand exchange, and complexation mechanisms.

Keywords:
AdsorptionBiocharLanthanumPhosphate

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemistry

Background:

  • Developing cost-effective and highly efficient adsorbents is crucial for phosphate removal.
  • Biochar is a promising material, but its adsorption capacity for phosphate can be limited.
  • Lanthanum (La) modification can enhance the adsorption properties of biochar.

Purpose of the Study:

  • To develop a low-cost and high-efficiency phosphate adsorbent using lanthanum-loaded biochar (La-BC).
  • To investigate the adsorption capacity and mechanisms of La-BC for phosphate removal.
  • To compare the performance of La-BC with pristine biochar (CK-BC).

Main Methods:

  • Lanthanum (La) loaded biochar (La-BC) was prepared via a chemical precipitation method.
  • Characterization of La-BC and CK-BC using zeta potential, BET surface area, SEM-EDS, XRD, XPS, and FT-IR.
  • Adsorption isotherm, kinetic, and thermodynamic studies were conducted to understand adsorption behavior and mechanisms.

Main Results:

  • La-BC exhibited significantly higher phosphate adsorption capacity than CK-BC, reaching a maximum of 46.37 mg g⁻¹.
  • Adsorption followed the Langmuir isotherm and second-order kinetic model, indicating homogeneous and chemical adsorption processes.
  • Characterization confirmed the presence of La-composites (LaOOH, LaONO3, La(OH)3) on biochar, reducing surface charge and area.

Conclusions:

  • Lanthanum modification enhances biochar's efficiency for phosphate adsorption.
  • Phosphate adsorption mechanisms involve precipitation, ligand exchange, and complexation interactions.
  • La-BC is a promising, low-cost, and high-efficiency adsorbent for phosphate removal.