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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Oxidation of Phenols to Quinones01:17

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Recycling Endosomes and Transcytosis00:58

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The recycling endosome, also known as the endosomal recycling compartment (ERC), is a part of the slow-recycling process of the endocytic pathway. Molecules internalized through receptor-mediated endocytosis are either degraded in the lysosomes or are recycled to the plasma membrane through the fast- or slow-recycling route.
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Structure and Nomenclature of Alcohols and Phenols02:23

Structure and Nomenclature of Alcohols and Phenols

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Overview
Alcohols are one of the most important functional groups in organic chemistry. The name of alcohol comes from the hydrocarbon from which it is derived. Alcohols are organic molecules containing the functional hydroxyl or –OH group directly bonded to carbon. Phenols have an OH group directly attached to a benzene ring. While alcohols are colorless, phenol is a white crystalline compound with a characteristic "hospital smell" odor.
As with other organic compounds, alcohols and...
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Physical Properties of Alcohols and Phenols02:32

Physical Properties of Alcohols and Phenols

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Alcohols are organic compounds in which a hydroxy group is attached to a saturated carbon. Phenols are a class of alcohols containing a hydroxy group attached to an aromatic ring. The physical properties of the alcohols and phenols are influenced by hydrogen bonding due to the oxygen–hydrogen dipole in the hydroxy functional group and dispersion forces between alkyl or aryl regions of alcohol and phenol molecules.
Alcohols possess a higher boiling point than aliphatic hydrocarbons of similar...
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Acidity and Basicity of Alcohols and Phenols02:36

Acidity and Basicity of Alcohols and Phenols

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Like water, alcohols are weak acids and bases. This is attributed to the polarization of the O–H bond making the hydrogen partially positive. Moreover, the electron pairs on the oxygen atom of alcohol make it both basic and nucleophilic. Protonation of an alcohol converts hydroxide, a poor leaving group, into water—a good one. The two acid–base equilibria corresponding to ethanol are depicted below.
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Ferromagnetic Bare Metal Stent for Endothelial Cell Capture and Retention
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Recyclable ferromagnetic chitosan nanozyme for decomposing phenol.

Jianfang Jiang1, Chunyang He1, Sen Wang1

  • 1School of Pharmacy, Zunyi Medical College, Zunyi, Guizhou, 563006, PR China.

Carbohydrate Polymers
|August 11, 2018
PubMed
Summary

Ferromagnetic chitosan nanozyme (MNP@CTS) effectively degrades phenol, offering an eco-friendly solution for environmental purification. This novel nanozyme demonstrates high catalytic activity, stability, and reusability for industrial applications.

Keywords:
ChitosanFerromagnetic nanoparticle (MNP)NanozymePhenolWastewater

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Area of Science:

  • Environmental Science and Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Phenol and phenolic compounds pose environmental risks, necessitating effective decomposition methods.
  • Ferromagnetic nanoparticles (MNP) show promise for phenol degradation but suffer from limited catalytic activity and stability.
  • Improving MNP properties is crucial for their practical application in environmental remediation.

Purpose of the Study:

  • To synthesize and characterize a novel ferromagnetic chitosan nanozyme (MNP@CTS) with enhanced properties.
  • To evaluate the catalytic efficiency of MNP@CTS for phenol and phenolic compound decomposition.
  • To assess the stability and reusability of MNP@CTS for sustainable environmental applications.

Main Methods:

  • Synthesized MNP@CTS using an improved hydrothermal method and molecular self-assembly.
  • Characterized MNP@CTS particle size, polydispersity index (PDI), zeta potential, and magnetic properties.
  • Optimized catalytic conditions (pH, temperature, substrate and H2O2 concentrations) for phenol degradation.

Main Results:

  • MNP@CTS exhibited favorable characteristics: particle size of 11.76 nm, PDI of 0.073, zeta potential of 40.34 mV, saturation magnetization of 35.28 emu/g, and coercivity of 17.56 Oe.
  • Under optimized conditions, MNP@CTS achieved over 95% phenol removal from aqueous solutions within 5 hours.
  • MNP@CTS demonstrated excellent stability and reusability, maintaining effectiveness for at least ten regeneration cycles.

Conclusions:

  • The developed MNP@CTS nanozyme offers a highly effective, stable, and reusable solution for environmental phenol decomposition.
  • This study provides a foundation for the eco-friendly application of MNP@CTS in environmental purification.
  • MNP@CTS presents attractive features including ease of preparation, low cost, and superior catalytic performance.