Limits...
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.


Schematic illustration of synthesis steps for Fe3O4@rGO@TiO2 hybrid. (a) Fe3O4 modified by APTMS. (b) Synthesis step of GO wrapped Fe3O4. The hybrid was synthesized through electrostatic interactions. (c) Synthesis step of Fe3O4@rGO@TiO2.The hybrid was synthesized through one step hydrothermal GO reduction and TiO2 crystallization.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4441169&req=5

f7: Schematic illustration of synthesis steps for Fe3O4@rGO@TiO2 hybrid. (a) Fe3O4 modified by APTMS. (b) Synthesis step of GO wrapped Fe3O4. The hybrid was synthesized through electrostatic interactions. (c) Synthesis step of Fe3O4@rGO@TiO2.The hybrid was synthesized through one step hydrothermal GO reduction and TiO2 crystallization.

Mentions: 1.299 g of FeCl3, 0.5 g of trisodium citrate, and 2.0 g of NaAc were dissolved in 40 mL of ethylene glycol with magnetic stirring. The homogeneous yellow solution was then transformed into a 100 mL Teflon-lined stainless-steel autoclave, heated at 200 °C for about 10 h, and then cooled to room temperature. The obtained black products were washed by ethanol and distilled water for three times, respectively. 0.5 g of the obtained Fe3O4 was homogeneous dispersed in isopropyl alcohol solution by ultrasonic for 30 min. Afterwards, 0.5 mL of APTMS were added to the above mixture and refluxed at 80 °C for 24 h. The products shown in Fig. 7a were washing by ethanol for several times and then dried in a vacuum oven. Finally, 100 mL homogeneous aqueous solution of the APTMS modified Fe3O4 (APTMS-Fe3O4) was mixed with 150 mL of 0.5 mg/mL GO for about 30 min under mechanical stirring to get GO wrapped Fe3O4 (Fe3O4@GO) nanospheres just like the image illustrated in Fig. 7b.


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)

Schematic illustration of synthesis steps for Fe3O4@rGO@TiO2 hybrid. (a) Fe3O4 modified by APTMS. (b) Synthesis step of GO wrapped Fe3O4. The hybrid was synthesized through electrostatic interactions. (c) Synthesis step of Fe3O4@rGO@TiO2.The hybrid was synthesized through one step hydrothermal GO reduction and TiO2 crystallization.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f7: Schematic illustration of synthesis steps for Fe3O4@rGO@TiO2 hybrid. (a) Fe3O4 modified by APTMS. (b) Synthesis step of GO wrapped Fe3O4. The hybrid was synthesized through electrostatic interactions. (c) Synthesis step of Fe3O4@rGO@TiO2.The hybrid was synthesized through one step hydrothermal GO reduction and TiO2 crystallization.
Mentions: 1.299 g of FeCl3, 0.5 g of trisodium citrate, and 2.0 g of NaAc were dissolved in 40 mL of ethylene glycol with magnetic stirring. The homogeneous yellow solution was then transformed into a 100 mL Teflon-lined stainless-steel autoclave, heated at 200 °C for about 10 h, and then cooled to room temperature. The obtained black products were washed by ethanol and distilled water for three times, respectively. 0.5 g of the obtained Fe3O4 was homogeneous dispersed in isopropyl alcohol solution by ultrasonic for 30 min. Afterwards, 0.5 mL of APTMS were added to the above mixture and refluxed at 80 °C for 24 h. The products shown in Fig. 7a were washing by ethanol for several times and then dried in a vacuum oven. Finally, 100 mL homogeneous aqueous solution of the APTMS modified Fe3O4 (APTMS-Fe3O4) was mixed with 150 mL of 0.5 mg/mL GO for about 30 min under mechanical stirring to get GO wrapped Fe3O4 (Fe3O4@GO) nanospheres just like the image illustrated in Fig. 7b.

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.