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Related Concept Videos

Microbial Corrosion01:24

Microbial Corrosion

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Microbiologically Influenced Corrosion (MIC) is a significant form of material degradation caused by the metabolic activities of microorganisms. This phenomenon poses substantial challenges across various industries, including oil and gas, maritime, and water treatment sectors.MIC occurs when microorganisms, such as bacteria, archaea, and fungi, colonize metal surfaces, forming biofilms that alter the local electrochemical environment. These biofilms can lead to the production of corrosive...
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Related Experiment Video

Updated: Mar 28, 2026

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx
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Nanomaterials to Combat NO(x) Pollution.

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    |December 31, 2015
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    This summary is machine-generated.

    Researchers are developing advanced nanomaterials, particularly titanium dioxide (TiO2) compounds, to improve photocatalysis for removing harmful nitrogen oxide (NOx) gases from the atmosphere. Enhanced TiO2 materials show promise in combating air pollution through efficient photochemical oxidation.

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    Area of Science:

    • Environmental Science
    • Materials Science
    • Chemistry

    Background:

    • Nitrogen oxide (NOx) gases (NO + NO2) pose significant environmental and health risks.
    • Photocatalysis offers an innovative solution for removing NOx from the atmosphere via photochemical oxidation.
    • Developing advanced nanomaterials is crucial for enhancing NOx removal efficiency.

    Purpose of the Study:

    • To explore novel nanomaterials for improved photocatalytic degradation of NOx gases.
    • To investigate the impact of specific surface area, morphology, and chemical modifications on TiO2 photocatalytic activity.
    • To evaluate alternative visible-light photocatalysts for De-NOx applications.

    Main Methods:

    • Synthesizing TiO2-based compounds with high specific surface area (SSA) using various substrates (e.g., carbon fibers, mesoporous materials).
    • Developing TiO2 nanostructures like nanotubes and nanoparticles with optimized sizes.
    • Doping TiO2 with ions to enhance visible-light photocatalytic performance.
    • Investigating alternative non-TiO2 photocatalysts active under visible light (λ > 400 nm).

    Main Results:

    • Dispersing TiO2 on substrates like organic fibers and clays increased SSA.
    • Nanotubes, self-ordered nano-tubular films, and small nanoparticles demonstrated high photocatalytic performance.
    • Ion-doped TiO2 exhibited enhanced activity under visible light due to intermediate energy states.
    • Alternative photocatalysts showed good De-NOx efficiency under visible light irradiation.

    Conclusions:

    • Optimized TiO2-based nanomaterials, through structural and chemical modifications, significantly enhance NOx photocatalytic removal.
    • Nanomaterial design, including high SSA, specific morphologies, and ion doping, is key to improving De-NOx efficiency.
    • Visible-light-active photocatalysts offer a promising alternative for sustainable NOx abatement.