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Related Concept Videos

pH01:24

pH

121.5K
The potential of hydrogen (pH) is a measure of the acidity or basicity of a water-based solution determined by the concentration of hydronium ions (H3O+). In one liter of pure water at neutral pH, there are 1×10−7 moles of hydronium ions. However, the extensive range of hydronium ion concentrations present in water-based solutions makes measuring pH in moles cumbersome. Therefore, a pH scale was developed to convert moles of hydronium ions into the negative logarithm of the hydronium...
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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.3K
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...
1.3K

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pH-Controlled Tailoring of Multiscale Magnetite Structure for Enhanced H2S Capture.

Wenying Li1,2,3, Yueyue He1,3, Qing Zhang1,3

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Researchers developed a pH-controlled synthesis for iron oxide adsorbents, revealing a pH threshold (≥7) crucial for effective hydrogen sulfide (H2S) removal. Optimizing pH enhances adsorption capacity significantly.

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Chemical Engineering

Background:

  • Iron oxide adsorbents show promise for hydrogen sulfide (H2S) removal due to cost and environmental benefits.
  • Precise control over microstructural features influencing H2S adsorption performance is not well understood.

Purpose of the Study:

  • To investigate the relationship between microstructure and adsorption performance in Fe-based adsorbents.
  • To elucidate the role of pH in controlling the synthesis of effective H2S adsorbents.

Main Methods:

  • A pH-controlled hydrothermal synthesis strategy using ferrous sulfate heptahydrate.
  • Characterization of adsorbent microstructure and surface properties.
  • Fixed-bed adsorption tests for H2S removal at ambient temperature.

Main Results:

  • A functional pH threshold of ≥7 was identified for pure-phase Fe3O4 formation and stabilization of the Fe2+/Fe3+ redox couple.
  • Adsorbent synthesized at pH 13.0 exhibited enhanced basicity, mesoporosity, and {111} facets.
  • Breakthrough capacity reached 85 mg/g, a 7-fold increase compared to pH 7, with a total sulfur uptake of 250 mg/g.

Conclusions:

  • Multiscale microstructural features, including redox-active sites, defects, and surface basicity, critically govern H2S capture efficiency.
  • The study provides a design strategy for tuning these features to optimize Fe-based adsorbents for H2S removal.