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Related Concept Videos

Coagulation01:06

Coagulation

373
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
373
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

524
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...
524
Electrodeposition01:08

Electrodeposition

709
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
709
Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

344
Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
344
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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Updated: Sep 8, 2025

A Dual-Functional Electroactive Filter Towards Simultaneously SbIII Oxidation and Sequestration
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Selenium(VI) Removal from Challenge Waters by Continuous-Flow-Through Iron Electrocoagulation.

Xicheng He1, Yihang Yuan1, Maya Mehrotra1

  • 1Department of Energy, Environmental and Chemical Engineering, Washington University at St. Louis, St. Louis, Missouri 63130, United States.

Environmental Science & Technology
|August 11, 2025
PubMed
Summary
This summary is machine-generated.

Iron electrocoagulation effectively removes selenate from water, but bicarbonate and sulfate significantly inhibit the process by altering iron solid reactivity. Optimizing iron dosage and sulfate pretreatment are key for real-world applications.

Keywords:
bicarbonateelectrocoagulationflue-gas desulfurizationgreen rustiron oxideseleniumsulfate

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Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Inorganic Chemistry

Background:

  • Selenium(VI) (selenate) is a contaminant of concern in various water bodies.
  • Iron electrocoagulation (EC) shows potential for selenate removal.
  • Understanding water matrix effects is crucial for effective EC application.

Purpose of the Study:

  • To investigate the performance of flow-through iron EC for selenate removal under environmentally relevant conditions.
  • To determine the influence of water composition on selenate removal efficiency.
  • To elucidate the mechanisms by which water components affect selenate removal.

Main Methods:

  • Flow-through iron electrocoagulation experiments were conducted.
  • The effects of major anions (bicarbonate, sulfate, nitrate) and humic acid were examined individually and in complex water matrices.
  • Analysis of iron solids formation, redox properties, and adsorption mechanisms was performed.

Main Results:

  • Bicarbonate inhibited selenate removal by forming less reactive iron solids (green rust).
  • Sulfate hindered iron solid oxidation and transformation, reducing reactivity with selenate.
  • Sulfate and high ionic strength were major inhibitors in real wastewater, requiring higher iron doses.
  • Sulfate pretreatment improved EC performance for agricultural and mining wastewater but not for FGD wastewater.

Conclusions:

  • Water composition significantly impacts iron electrocoagulation efficiency for selenate removal.
  • Bicarbonate and sulfate are key inhibitory species requiring management strategies.
  • Insights into solids formation, redox, and adsorption provide guidance for practical water treatment design.