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Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
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Nitriles to Ketones: Grignard Reaction00:57

Nitriles to Ketones: Grignard Reaction

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Organomagnesium halides, commonly known as Grignard reagents, convert nitriles to ketones and proceed through a nucleophilic acyl substitution. Nitriles react with a Grignard reagent, followed by an aqueous acid, to yield ketones. The reaction introduces a new carbon–carbon bond. The alkyl–magnesium bond in the Grignard reagent is highly polar, so the alkyl carbon develops a carbanionic character and acts as a nucleophile.
The mechanism begins with a nucleophilic attack by the Grignard...
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Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

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The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
6.0K
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

5.6K
All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

4.3K
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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization: A pilot-scale study.

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Hydrophobic Salt-modified Nafion for Enzyme Immobilization and Stabilization
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High efficiency and stable partial nitration achieved via gel immobilization.

Xin Hu1, Hong Yang1, Xiaoyue Fang2

  • 1Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering, Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, China.

Bioresource Technology
|January 6, 2024
PubMed
Summary

Gel-immobilized bacteria achieve stable partial nitrification (PN) for efficient nitrogen removal. This technology ensures rapid reactivation, even after disruptions, supporting practical wastewater treatment applications.

Keywords:
Immobilized fillerMicrobial community competitionMicrobial community structureOxygen-limited zoneRapid reactivation

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Area of Science:

  • Environmental Microbiology
  • Wastewater Treatment Technologies
  • Biotechnology

Background:

  • Partial nitrification (PN) is crucial for efficient nitrogen removal in wastewater treatment.
  • Maintaining stable PN performance, especially under varying conditions, remains a challenge.
  • Ammonia-oxidizing bacteria (AOB) play a key role in the PN process.

Purpose of the Study:

  • To evaluate the long-term efficiency and stability of partial nitrification using gel-immobilized bacteria.
  • To investigate the PN characteristics under different ammonia nitrogen concentrations and low temperatures.
  • To assess the rapid reactivation capability of the immobilized system after operational interruptions.

Main Methods:

  • Utilizing gel-immobilized partial nitrifying bacteria in a reactor system.
  • Comprehensive study of PN performance under high/low ammonia nitrogen and low temperatures.
  • Analysis of microbial community dynamics and oxygen gradients within the immobilized filler.
  • Monitoring ammonia oxidation rate and nitrite accumulation rate.

Main Results:

  • Achieved long-term high efficiency and stable partial nitrification performance.
  • Demonstrated maximum ammonia oxidation rate of 66.8 mg•(L•h)⁻¹ and >95% nitrite accumulation rate.
  • Confirmed rapid reactivation after reactor breakdown or stagnation periods.
  • Identified high abundance of AOB and dynamic microbial communities as key factors for stability.

Conclusions:

  • Gel-immobilized partial nitrifying bacteria offer a reliable technology for stable and efficient PN.
  • The system's stability is attributed to AOB abundance, microbial community dynamics, and oxygen limitation within the filler.
  • This approach provides a robust solution for practical nitrogen removal in wastewater treatment.