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    • Keywords


      Fe$_3$O$_4$; particle size; light irradiation; photodegradation.

    • Abstract


      Magnetite (Fe$_3$O$_4$) nanoparticles with different particle sizes (9.9–29.1 nm) were prepared by using the aerial oxidation method under light irradiation with various wavelengths at room temperature. The photocatalytic degradation of orange II using Fe$_3$O$_4$ nanoparticles as photocatalysts was evaluated. Experimental results showed that the particle sizes of Fe$_3$O$_4$ nanocrystals decreased gradually with the decreasing wavelengths of light irradiation. With the decrease in the size of the samples, the Fe$_3$O$_4$ nanoparticles exhibited a large surface area and high adsorption. Furthermore, the smallparticle-sized Fe$_3$O$_4$ sample could cause an appropriate red shift of the spectra and promote the decomposition of H$_2$O$_2$, and produce high-content ${}^{\bullet}$OH radicals, which lead to an improvement of photodegradation efficiency of orange II.

    • Author Affiliations



      1. College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, People’s Republic of China
      2. National Demonstration Center for Experimental Chemistry, Hebei Normal University, Shijiazhuang 050024, People’s Republic of China
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