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Radical Autoxidation01:20

Radical Autoxidation

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Radical Anti-Markovnikov Addition to Alkenes: Mechanism01:17

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The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
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Oxidation of Alcohols02:37

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In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
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Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells
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Modular advanced oxidation process enabled by cathodic hydrogen peroxide production.

James M Barazesh1, Tom Hennebel1, Justin T Jasper1

  • 1Department of Civil and Environmental Engineering, University of California, 407 O'Brien Hall, Berkeley, California 94720-1716, United States.

Environmental Science & Technology
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Summary
This summary is machine-generated.

A novel gas diffusion electrode generates hydrogen peroxide (H2O2) in situ for advanced oxidation processes (AOPs), simplifying water treatment and reducing operational costs for small-scale systems.

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Area of Science:

  • Environmental Chemistry
  • Water Treatment Technologies
  • Electrochemistry

Background:

  • Advanced Oxidation Processes (AOPs) commonly use hydrogen peroxide (H2O2) and UV light to degrade organic contaminants.
  • Maintaining concentrated H2O2 stock solutions is costly and complex for small-scale water treatment systems.

Purpose of the Study:

  • To develop an in-situ H2O2 generation method for AOPs using a gas diffusion electrode.
  • To evaluate the effectiveness of this system for trace organic contaminant removal in various water matrices.
  • To assess the operational costs and energy efficiency of the proposed technology.

Main Methods:

  • A gas diffusion electrode was employed to generate H2O2 directly in water before UV treatment.
  • Treated water passed through an anodic chamber to adjust pH and remove residual H2O2.
  • System performance was tested with various trace contaminants in simulated groundwater, surface water, wastewater effluent, and NaCl solutions.

Main Results:

  • The system reliably produced sufficient H2O2 for treating up to 120 L/day across different water types.
  • Contaminant removal efficiency depended on current density and hydroxyl radical scavenger concentrations.
  • Electrical energy per order (EEO) ranged from 1 to 3 kWh/m³, with UV lamps being the primary energy consumers.
  • The gas diffusion electrode demonstrated sustained high efficiency without performance degradation in tested matrices.

Conclusions:

  • In-situ H2O2 generation via a gas diffusion electrode is a viable and efficient method for small-scale AOPs.
  • This approach reduces operational complexity and cost associated with traditional H2O2 replenishment.
  • The technology shows promise for effective trace organic contaminant removal in diverse water sources.