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Novel magnetic Fe3O4@C nanoparticles as adsorbents for removal of organic dyes from aqueous solution

Zhengyong Zhang1, Jilie Kong

  • 1Department of Chemistry, Fudan University, Shanghai 200433, China.

Journal of Hazardous Materials
|August 5, 2011
PubMed

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.