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Related Concept Videos

Redox Titration: Other Oxidizing and Reducing Agents01:26

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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
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Enhancing Aqueous Chlorate Reduction Using Vanadium Redox Cycles and pH Control.

Jinyu Gao1, Gongde Chen1, Qi Fu1,2

  • 1Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, United States.

Environmental Science & Technology
|November 17, 2023
PubMed
Summary

Adding vanadium to palladium catalysts significantly enhances chlorate reduction, a toxic pollutant. This breakthrough offers a more efficient method for water treatment and pollutant removal.

Keywords:
X-ray photoelectron spectroscopy (XPS)catalystchlorateelectrochemical studypalladiumrecycleredoxvanadium

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Area of Science:

  • Environmental Chemistry
  • Catalysis Science
  • Materials Science

Background:

  • Chlorate (ClO3-) is a toxic oxyanion pollutant originating from various industrial and agricultural sources, posing risks to water quality.
  • Conventional catalytic reduction of chlorate using palladium (Pd) nanoparticle catalysts shows limited efficiency due to sluggish kinetics.
  • Developing effective methods for chlorate removal is crucial for ensuring safe drinking water and mitigating environmental pollution.

Purpose of the Study:

  • To enhance the catalytic activity for chlorate reduction by integrating earth-abundant vanadium (V) into palladium on carbon (Pd/C) catalysts.
  • To elucidate the underlying catalytic mechanism, particularly the role of vanadium in the reduction process.
  • To develop a method for catalyst recovery and recycling after the treatment process.

Main Methods:

  • Synthesis of a V-integrated Pd/C catalyst.
  • Catalytic reduction of chlorate using the modified catalyst and hydrogen gas.
  • Characterization using X-ray photoelectron spectroscopy (XPS) and electrochemical studies.
  • Investigation of the vanadium redox cycle and its role in chlorate reduction.
  • pH-controlled immobilization of vanadium for catalyst recycling.

Main Results:

  • An 18-fold enhancement in catalytic activity for chlorate reduction was achieved by integrating vanadium into the Pd/C catalyst.
  • X-ray photoelectron spectroscopy and electrochemical studies revealed that the VIII/IV redox cycle, facilitated by Pd-activated H2, is the primary mechanism for chlorate reduction.
  • Chlorine intermediates are further reduced to chloride (Cl-) via VIII/IV and VIV/V redox cycles or direct reduction by Pd/C.
  • Adjusting the pH to 8 effectively immobilized the vanadium species onto the Pd/C support, enabling catalyst recycling.

Conclusions:

  • The integration of vanadium into Pd/C catalysts significantly boosts the efficiency of chlorate reduction, offering a promising solution for water remediation.
  • The VIII/IV redox cycle plays a critical role in the enhanced catalytic performance, expanding the scope of transition metals for water pollutant treatment.
  • The developed pH-triggered immobilization strategy allows for effective catalyst recycling, promoting sustainable water treatment practices.