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Related Concept Videos

Factors Affecting Solubility04:01

Factors Affecting Solubility

35.9K
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:
35.9K
Formation of Complex Ions03:45

Formation of Complex Ions

25.0K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
25.0K
Precipitation Reactions03:10

Precipitation Reactions

62.2K
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...
62.2K
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

3.6K
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...
3.6K
Colloidal precipitates01:09

Colloidal precipitates

3.2K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
3.2K
Masking and Demasking Agents01:19

Masking and Demasking Agents

3.2K
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
3.2K

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Related Experiment Video

Updated: Nov 30, 2025

Synthesis and Characterization of Fe-doped Aluminosilicate Nanotubes with Enhanced Electron Conductive Properties
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Adsorption behavior of Fe (III) in aqueous solution on melamine.

Hao Peng1, Jing Guo1, Bingqing Wang2

  • 1College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|November 17, 2020
PubMed
Summary
This summary is machine-generated.

Melamine effectively adsorbs nearly 99% of iron (III) from aqueous solutions. Optimal conditions involve a specific melamine dosage, 60-minute reaction time, and 90°C, indicating a promising method for wastewater treatment.

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Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Adsorption Science

Background:

  • Iron (III) contamination in water poses environmental and health risks.
  • Developing efficient adsorbents for heavy metal removal is crucial for water purification.

Purpose of the Study:

  • To investigate the adsorption behavior of iron (III) onto melamine.
  • To determine optimal experimental conditions for iron (III) removal.
  • To elucidate the adsorption mechanism and kinetics.

Main Methods:

  • Batch adsorption experiments were conducted.
  • Response surface methodology (RSM) was employed to optimize parameters.
  • Adsorption kinetics and thermodynamics were analyzed.

Main Results:

  • Nearly 99% Fe (III) removal was achieved under optimal conditions (mole ratio 3.5:1, 60 min, 90 °C).
  • Parameter importance order for Fe (III) removal: mole ratio > temperature > time.
  • Adsorption followed pseudo-second-order kinetics and was endothermic and unspontaneous.
  • Physisorption was identified as the primary adsorption mechanism.

Conclusions:

  • Melamine is a highly effective adsorbent for Fe (III) removal from aqueous solutions.
  • Optimized conditions and understanding the adsorption mechanism provide a basis for practical wastewater treatment applications.
  • The study offers valuable insights for designing efficient systems for treating iron-contaminated effluents.