C60 aminofullerene-magnetite nanocomposite designed for efficient visible light photocatalysis and magnetic recovery
- C60 aminofullerene-magnetite nanocomposite designed for efficient visible light photocatalysis and magnetic recovery
- 최여선; 예영진; Yuri Mackeyev; 조민; 이상협; Lon J. Wilson; 이진우; Pedro J.J. Alvarez; 최원용; 이재상
- Issue Date
- VOL 69, 92-100
- A magnetically recyclable photosensitizing system for harnessing solar energy for water
treatment and disinfection is reported. This system comprises C60 aminofullerene as a sensitizer for singlet oxygenation and functionalized mesoporous silica (msu-f SiO2) encapsulating
magnetite nanoparticles (msu-SiO2/mag) as a magnetically separable host. Rapid degradation of furfuryl alcohol (FFA) (a singlet oxygen (1O2) probe) under visible-light irradiation
along with the kinetic retardation of FFA decomposition in the presence of 1O2
quenchers suggests that the visible-light activity of C60 aminofullerene-derivatized msu-
SiO2/mag (C60/msu-SiO2/mag) is related to the photosensitization of 1O2. On the other hand,
the use of SiO2 gel and fumed SiO2 as magnetic supports drastically reduced the photosensitized generation of 1O2, which is ascribed to the absence of an ordered pore structure in
the alternative silica support, resulting in an uncontrolled growth of Fe3O4 and an aggregation
of the fullerenes on the SiO2 gel and fumed SiO2. Significant 1O2 production using C60/
msu-SiO2/mag led to the effective oxidation of emerging pharmaceutical contaminants and
inactivation of MS-2 bacteriophage under visible-light irradiation. Magnetic recovery and
the subsequent reuse of the composite did not cause any significant loss in the photosensitizing activity of C60/msu-SiO2/mag, demonstrating its potential for catalytic applications.
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