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Related Concept Videos

Ion Exchange01:17

Ion Exchange

642
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
642
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

2.0K
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...
2.0K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

519
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...
519
Factors Affecting Solubility04:01

Factors Affecting Solubility

33.9K
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:
33.9K

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Related Experiment Video

Updated: Sep 1, 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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Resin-based iron-manganese binary oxide for phosphate selective removal.

Jie Wang1, Yongcan Jiang2, Musheng Xu1

  • 1College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China.

Environmental Science and Pollution Research International
|August 16, 2022
PubMed
Summary

A novel iron-manganese oxide-modified resin effectively removes phosphorus from water, aiding resource recovery and preventing eutrophication. This stable, reusable adsorbent shows excellent performance even with coexisting ions and humic acid.

Keywords:
Binary oxideIon-exchange resinIronManganesePhosphate

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Water Treatment

Background:

  • Adsorption is key for phosphorus removal and recovery, crucial for mitigating water eutrophication and resource scarcity.
  • Ion-exchange resins face challenges in practical application due to humic acid and coexisting ions causing competitive adsorption and pore blockage.

Purpose of the Study:

  • To develop a robust adsorbent for efficient phosphorus removal and recovery from water.
  • To overcome the limitations of traditional ion-exchange resins in complex water matrices.

Main Methods:

  • Synthesized an iron-manganese oxide-modified resin composite (Fe/Mn-402) using nanoconfinement theory.
  • Characterized the adsorbent using XRD, FT-IR, SEM, and XPS.
  • Conducted batch adsorption experiments to evaluate performance and selectivity.

Main Results:

  • Fe/Mn-402 demonstrated successful loading of iron-manganese binary oxide onto the resin with good stability.
  • Achieved a maximum phosphorus adsorption capacity of 50.97 mg/g at an optimal Fe:Mn ratio of 1:1.
  • Exhibited excellent selectivity and stable adsorption performance in the presence of high concentrations of sulfate, bicarbonate, and humic acid.
  • Showcased recyclability with sustained treatment capacity over multiple cycles.

Conclusions:

  • Fe/Mn-402 is a promising adsorbent for phosphorus removal and recovery, particularly in challenging wastewater conditions.
  • The nanoconfinement approach offers a new strategy for designing advanced adsorbents for water treatment.
  • The developed adsorbent is suitable for stable, long-term application in phosphorus management.