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The Phosphorus Cycle01:21

The Phosphorus Cycle

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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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Related Experiment Video

Updated: Aug 3, 2025

Optimized Procedure for Determining the Adsorption of Phosphonates onto Granular Ferric Hydroxide using a Miniaturized Phosphorus Determination Method
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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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Sustainable Low-Cost Phosphorus Recovery Using Nanostructured Materials with Reusability Potential.

David Gómez-Carnota1, José L Barriada1, Pilar Rodríguez-Barro1

  • 1Departamento de Química and CICA-Centro Interdisciplinar de Química e Bioloxía, Universidade da Coruña, As Carballeiras, s/n, 15071 A Coruña, Spain.

Nanomaterials (Basel, Switzerland)
|April 13, 2023
PubMed
Summary
This summary is machine-generated.

A novel, low-cost material using sodium silicate effectively removes phosphorus from water. Its iron-rich nanostructure allows for potential reuse as a valuable crop fertilizer.

Keywords:
adsorptionenvironmental remediationironnanostructuresphosphorusrecovery

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Agricultural Science

Background:

  • Developing cost-effective materials for water remediation is crucial.
  • Phosphorus recovery from wastewater offers potential for resource reuse, such as in fertilizers.

Purpose of the Study:

  • To develop and characterize a low-cost, nanostructured material for efficient phosphorus adsorption.
  • To investigate the material's potential for reuse as a crop fertilizer.

Main Methods:

  • Material synthesis using a sodium silicate polymeric base with iron.
  • Characterization via Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDS), and N2 sorption.
  • Adsorption studies analyzing the effects of pH, ionic strength, and temperature, using Boyd's diffusion and adsorption equilibrium models.

Main Results:

  • The material exhibits a nanostructured, iron-rich surface ideal for phosphate adsorption.
  • Maximum iron adsorption reached 23.9 ± 0.3 mg Fe∙g-1, with a high phosphorus adsorption capacity of 366 ± 21 mg P∙g-1 Fe.
  • The polymeric base acts as a support, preventing nanoparticle agglomeration and simplifying separation.

Conclusions:

  • The developed material is an inexpensive and effective adsorbent for phosphorus removal from aqueous media.
  • The iron nanostructures facilitate efficient phosphorus capture, with potential for direct application as a fertilizer.