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Related Concept Videos

Factors Affecting Solubility04:01

Factors Affecting Solubility

35.0K
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:
35.0K
Precipitation Reactions03:10

Precipitation Reactions

57.7K
In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
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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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Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

2.4K
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
2.4K
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

3.0K
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...
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Photoluminescence: Applications01:14

Photoluminescence: Applications

591
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Related Experiment Video

Updated: Oct 30, 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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Phosphate removal from aqueous solution by Fe-La binary (hydr)oxides: characterizations and mechanisms.

Haijing Duan1,2,3, Lin Zhang1,3, Yulong Wang4,5,6

  • 1College of Geography and Environmental Science, Henan University, Kaifeng, 475004, China.

Environmental Science and Pollution Research International
|July 3, 2021
PubMed
Summary

Fe-La binary (hydr)oxides efficiently remove phosphate from water. Higher lanthanum (La) concentrations significantly boost adsorption capacity, with mechanisms involving surface hydroxyl exchange and LaPO4 precipitation.

Keywords:
AdsorptionFe–La binary (hydr)oxidesPhosphateRemovalRhabdophane

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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
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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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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Inorganic Chemistry

Background:

  • Phosphate contamination poses a significant environmental threat, necessitating effective remediation strategies.
  • Developing novel adsorbents with high efficiency and capacity for phosphate removal is crucial for water treatment.

Purpose of the Study:

  • To synthesize and characterize Fe-La binary (hydr)oxides for phosphate removal.
  • To investigate the adsorption performance, kinetics, and mechanisms of these materials.

Main Methods:

  • Co-precipitation method for synthesizing Fe-La binary (hydr)oxides.
  • Characterization using SEM-EDX, p-XRD, BET, FTIR, and XPS.
  • Batch adsorption experiments to evaluate phosphate removal efficiency and kinetics.

Main Results:

  • Phosphate removal performance increased with higher La concentrations.
  • Adsorption followed pseudo-second-order kinetics, indicating a chemisorption process.
  • Maximum adsorption capacities varied with Fe/La ratios, reaching 136.99 mg/g for Fe/La 1:3 at pH 4.0.
  • Phosphate uptake was pH-dependent, decreasing with increasing pH.
  • Mechanisms included surface hydroxyl exchange and LaPO4 precipitation.

Conclusions:

  • Fe-La binary (hydr)oxides demonstrate excellent potential for phosphate decontamination.
  • The high adsorption capacity and efficient removal highlight their applicability in wastewater treatment.