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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.


Photo-Fenton degradation of MB in the presence of Fe3O4@rGO@TiO2 at room temperature under neutral pH. (a) Effect of catalyst dosage on MB degradation (initial MB concentration, 10 mg/L; H2O2, 0.088 M); (b) Effect of H2O2 dosage on MB degradation(initial MB concentration, 10 mg/L; catalysts, 1.5 g/L).
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f4: Photo-Fenton degradation of MB in the presence of Fe3O4@rGO@TiO2 at room temperature under neutral pH. (a) Effect of catalyst dosage on MB degradation (initial MB concentration, 10 mg/L; H2O2, 0.088 M); (b) Effect of H2O2 dosage on MB degradation(initial MB concentration, 10 mg/L; catalysts, 1.5 g/L).

Mentions: The effect of the dose of the catalysts on the degradation activity in the Fenton process was illustrated in Fig. 4a. It can be concluded that the degradation accelerated as the amount of the catalyst increased from 0.1 to 1.5 g/L, but dropped with excessive dosage, as can be seen from the data of dosage of 2.0 g/L. This phenomenon can be ascribed to the reason that the number of the reactive sites can be increased when the amount of the composites were increasing. However, these nanoparticles may have a tendency to aggregate when their quantity is in excess, thus contributing to the decrease of the reactive sites. Besides, excess amount of Fe3O4 may exist as the scavenger of hydroxyl radicals38394041. In this study, the optimal amount of the catalyst was 1.5 g/L just as shown in Fig. 4a.


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)

Photo-Fenton degradation of MB in the presence of Fe3O4@rGO@TiO2 at room temperature under neutral pH. (a) Effect of catalyst dosage on MB degradation (initial MB concentration, 10 mg/L; H2O2, 0.088 M); (b) Effect of H2O2 dosage on MB degradation(initial MB concentration, 10 mg/L; catalysts, 1.5 g/L).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: Photo-Fenton degradation of MB in the presence of Fe3O4@rGO@TiO2 at room temperature under neutral pH. (a) Effect of catalyst dosage on MB degradation (initial MB concentration, 10 mg/L; H2O2, 0.088 M); (b) Effect of H2O2 dosage on MB degradation(initial MB concentration, 10 mg/L; catalysts, 1.5 g/L).
Mentions: The effect of the dose of the catalysts on the degradation activity in the Fenton process was illustrated in Fig. 4a. It can be concluded that the degradation accelerated as the amount of the catalyst increased from 0.1 to 1.5 g/L, but dropped with excessive dosage, as can be seen from the data of dosage of 2.0 g/L. This phenomenon can be ascribed to the reason that the number of the reactive sites can be increased when the amount of the composites were increasing. However, these nanoparticles may have a tendency to aggregate when their quantity is in excess, thus contributing to the decrease of the reactive sites. Besides, excess amount of Fe3O4 may exist as the scavenger of hydroxyl radicals38394041. In this study, the optimal amount of the catalyst was 1.5 g/L just as shown in Fig. 4a.

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.