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Rapid degradation of methylene blue in a novel heterogeneous Fe3O4 @rGO@TiO2-catalyzed photo-Fenton system.

Yang X, Chen W, Huang J, Zhou Y, Zhu Y, Li C - Sci Rep (2015)

Bottom Line: This as-prepared catalyst reflected good ferromagnetism and superior stability which makes it convenient to be separated and recycled.Due to the synergic effects between the different components composed the catalyst, swift reduction of Fe(3+) can be achieved to regenerate Fe(2+).Fe3O4@rGO@TiO2 exhibited enhancing catalytic activity for the degradation of azo-dyes compared with Fe3O4, Fe3O4@SiO2@TiO2 or SiO2@rGO@TiO2, further conforming the rapid redox reaction between Fe(2+) and Fe(3+).

View Article: PubMed Central - PubMed

Affiliation: East China University of Science and Technology, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, Shanghai 200237, China.

ABSTRACT
Herein, a ternary nanocomposite with TiO2 nanoparticles anchored on reduced graphene oxide (rGO)-encapsulated Fe3O4 spheres (Fe3O4@rGO@TiO2) is presented as a high efficient heterogeneous catalyst for photo-Fenton degradation of recalcitrant pollutants under neutral pH. Fe3O4@rGO@TiO2 was synthesized by depositing TiO2 nanoparticles on the surface of the Fe3O4 spheres wrapped by graphene oxide (GO) which was obtained by an electrostatic layer-by-layer method. This as-prepared catalyst reflected good ferromagnetism and superior stability which makes it convenient to be separated and recycled. Due to the synergic effects between the different components composed the catalyst, swift reduction of Fe(3+) can be achieved to regenerate Fe(2+). Fe3O4@rGO@TiO2 exhibited enhancing catalytic activity for the degradation of azo-dyes compared with Fe3O4, Fe3O4@SiO2@TiO2 or SiO2@rGO@TiO2, further conforming the rapid redox reaction between Fe(2+) and Fe(3+). All these merits indicate that the composite catalyst possesses great potential for visible-light driven destruction of organic compounds.

No MeSH data available.


(a) Photograph of MB before and after photo-Fenton reaction. (b) The cyclic utilization of the as-prepared Fe3O4@rGO@TiO2 hybrids for the degradation of MB with the addition of H2O2 and illumination at neutral pH and room temperature for 120 min. (c) XRD patterns of Fe3O4@rGO@TiO2 before and after six cycles. (d) TEM image of Fe3O4@rGO@TiO2 after six cycles.
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f5: (a) Photograph of MB before and after photo-Fenton reaction. (b) The cyclic utilization of the as-prepared Fe3O4@rGO@TiO2 hybrids for the degradation of MB with the addition of H2O2 and illumination at neutral pH and room temperature for 120 min. (c) XRD patterns of Fe3O4@rGO@TiO2 before and after six cycles. (d) TEM image of Fe3O4@rGO@TiO2 after six cycles.

Mentions: The stability of the catalytic materials is of great importance if the catalysts are to be practically applicable. The as-prepared catalyst Fe3O4@rGO@TiO2 can be easily separated from the MB solution by magnetic field and for reuse. Figure 5a shows the photograph comparing the MB solutions before and after the Fenton reaction, from which we can distinctly observe that MB almost totally discolored after the reaction. As depicted in Fig. 5b, the removal of MB during the first catalytic run could be achieved above 99.0% after 2 h. After six recycles for the catalytic degradation of MB, the catalytic activity of Fe3O4@rGO@TiO2 just slightly decreased. As can be seen in Fig. 5b, the degradation efficiency of Fe3O4@rGO@TiO2 can reach up to 93% after 2 h even if the catalysts had been utilized for several times, which indicates that this catalyst can maintain good stability. The TEM image of the Fe3O4@rGO@TiO2 which had been used for six times shown in Fig. 5d also proved the catalysts’ stability. The morphology of the as-prepared catalyst did not undergo obvious change even after several cycles. The XRD patterns (Fig. 5c) of the freshly prepared catalyst and the catalyst recycled after many times further illustrated the stability of the catalysts.


Rapid degradation of methylene blue in a novel heterogeneous Fe3O4 @rGO@TiO2-catalyzed photo-Fenton system.

Yang X, Chen W, Huang J, Zhou Y, Zhu Y, Li C - Sci Rep (2015)

(a) Photograph of MB before and after photo-Fenton reaction. (b) The cyclic utilization of the as-prepared Fe3O4@rGO@TiO2 hybrids for the degradation of MB with the addition of H2O2 and illumination at neutral pH and room temperature for 120 min. (c) XRD patterns of Fe3O4@rGO@TiO2 before and after six cycles. (d) TEM image of Fe3O4@rGO@TiO2 after six cycles.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4441169&req=5

f5: (a) Photograph of MB before and after photo-Fenton reaction. (b) The cyclic utilization of the as-prepared Fe3O4@rGO@TiO2 hybrids for the degradation of MB with the addition of H2O2 and illumination at neutral pH and room temperature for 120 min. (c) XRD patterns of Fe3O4@rGO@TiO2 before and after six cycles. (d) TEM image of Fe3O4@rGO@TiO2 after six cycles.
Mentions: The stability of the catalytic materials is of great importance if the catalysts are to be practically applicable. The as-prepared catalyst Fe3O4@rGO@TiO2 can be easily separated from the MB solution by magnetic field and for reuse. Figure 5a shows the photograph comparing the MB solutions before and after the Fenton reaction, from which we can distinctly observe that MB almost totally discolored after the reaction. As depicted in Fig. 5b, the removal of MB during the first catalytic run could be achieved above 99.0% after 2 h. After six recycles for the catalytic degradation of MB, the catalytic activity of Fe3O4@rGO@TiO2 just slightly decreased. As can be seen in Fig. 5b, the degradation efficiency of Fe3O4@rGO@TiO2 can reach up to 93% after 2 h even if the catalysts had been utilized for several times, which indicates that this catalyst can maintain good stability. The TEM image of the Fe3O4@rGO@TiO2 which had been used for six times shown in Fig. 5d also proved the catalysts’ stability. The morphology of the as-prepared catalyst did not undergo obvious change even after several cycles. The XRD patterns (Fig. 5c) of the freshly prepared catalyst and the catalyst recycled after many times further illustrated the stability of the catalysts.

Bottom Line: This as-prepared catalyst reflected good ferromagnetism and superior stability which makes it convenient to be separated and recycled.Due to the synergic effects between the different components composed the catalyst, swift reduction of Fe(3+) can be achieved to regenerate Fe(2+).Fe3O4@rGO@TiO2 exhibited enhancing catalytic activity for the degradation of azo-dyes compared with Fe3O4, Fe3O4@SiO2@TiO2 or SiO2@rGO@TiO2, further conforming the rapid redox reaction between Fe(2+) and Fe(3+).

View Article: PubMed Central - PubMed

Affiliation: East China University of Science and Technology, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, Shanghai 200237, China.

ABSTRACT
Herein, a ternary nanocomposite with TiO2 nanoparticles anchored on reduced graphene oxide (rGO)-encapsulated Fe3O4 spheres (Fe3O4@rGO@TiO2) is presented as a high efficient heterogeneous catalyst for photo-Fenton degradation of recalcitrant pollutants under neutral pH. Fe3O4@rGO@TiO2 was synthesized by depositing TiO2 nanoparticles on the surface of the Fe3O4 spheres wrapped by graphene oxide (GO) which was obtained by an electrostatic layer-by-layer method. This as-prepared catalyst reflected good ferromagnetism and superior stability which makes it convenient to be separated and recycled. Due to the synergic effects between the different components composed the catalyst, swift reduction of Fe(3+) can be achieved to regenerate Fe(2+). Fe3O4@rGO@TiO2 exhibited enhancing catalytic activity for the degradation of azo-dyes compared with Fe3O4, Fe3O4@SiO2@TiO2 or SiO2@rGO@TiO2, further conforming the rapid redox reaction between Fe(2+) and Fe(3+). All these merits indicate that the composite catalyst possesses great potential for visible-light driven destruction of organic compounds.

No MeSH data available.