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Related Concept Videos

Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

685
Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
685

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p-Phosphonated Calix[n]arene Stabilizes Superparamagnetic Nanoparticles for Nitrate and Phosphate Uptake.

Nicholas J D'Alonzo1, Paul K Eggers1, Ela Eroglu1,2

  • 1School of Chemistry and Biochemistry, The University of Western Australia, Crawley, WA, 6009, Australia.

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|January 22, 2020
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Summary

Superparamagnetic magnetite nanoparticles coated with p-phosphonated calixarenes were synthesized. These nanoparticles demonstrate dual functionality, effectively removing nitrate and phosphate from water.

Keywords:
calixarenesmagnetitenanoparticlesnitrate removalphosphate removal

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Area of Science:

  • Materials Science
  • Environmental Science
  • Nanotechnology

Background:

  • Superparamagnetic magnetite nanoparticles (Fe3O4) are crucial for various applications.
  • Calixarenes are macrocyclic compounds with tunable properties.
  • Controlling nanoparticle morphology and surface chemistry is key for enhanced functionality.

Purpose of the Study:

  • To synthesize superparamagnetic magnetite nanoparticles stabilized by p-phosphonated calixarenes.
  • To investigate the effect of calixarene ring size on nanoparticle morphology and magnetic properties.
  • To evaluate the dual functionality of these nanoparticles in water remediation.

Main Methods:

  • Co-precipitation technique for nanoparticle synthesis.
  • Characterization of nanoparticle size, shape, and magnetic properties.
  • Adsorption studies for nitrate and phosphate removal from aqueous solutions.

Main Results:

  • Facetted superparamagnetic magnetite nanoparticles (approx. 11 nm) were synthesized using p-phosphonated calix[n]arenes (n=4, 5, 6).
  • Spherical particles were obtained with the larger calix[8]arene.
  • Maximum magnetization ranged from 60-70 emu/g, decreasing with larger calixarene size.
  • Calixarenes bind to nanoparticles via phosphonate groups.
  • Nanoparticles removed up to 62% nitrate nitrogen and 48% phosphate from effluent.

Conclusions:

  • P-phosphonated calixarenes effectively stabilize superparamagnetic magnetite nanoparticles.
  • Calixarene size influences nanoparticle morphology and magnetic properties.
  • The synthesized nanoparticles exhibit promising dual functionality for water purification, removing both nitrate and phosphate contaminants.