CoFe 2 O 4 @ZnS core–shell spheres as magnetically recyclable photocatalysts for hydrogen production

Chang, Chi‐Jung; Lee, Zijing; Chu, Kuan-Wu; Wei, Yi-Hung

doi:10.1016/j.jtice.2016.06.033

Cited by 47 publications

(9 citation statements)

References 38 publications

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“…22,23 Chang et al reported that the CoFe 2 O 4 @ZnS photocatalyst fabricated for 0.5 h (ZnS growth time) achieved a H 2 production rate of 1650 μmol g −1 h −1 . 24 Chen et al also reported that g-C 3 N 4 modified with CoFe 2 O 4 exhibited almost 3 times increment in H 2 production activity in comparison with pure g-C 3 N 4 , with an apparent quantum yield of 3.5%. 25 However, the low conduction band potential compared with the redox hydrogen potential makes CoFe 2 O 4 an inferior photocatalyst toward photocatalytic water splitting, but it can be used as a photosensitizer.…”

Section: Introductionmentioning

confidence: 94%

“…In general, it is a very difficult task to remove or settle the catalyst after the reaction in heterogeneous catalysis. A useful strategy was proposed by integration of a TiO 2 -based photocatalyst with magnetic materials such as, CuFe 2 O 4 , CoFe 2 O 4 , and so on. , In particular, cobalt ferrite (CoFe 2 O 4 ) with a spinel structure has attracted significant attention for a variety of applications including photodegradation of organic pollutants and water splitting because of its visible-light-responsive photocatalytic activity, low band gap, nontoxicity, corrosion resistance, and chemical stability in aqueous solution, apart from its magnetic property. , Chang et al reported that the CoFe 2 O 4 @ZnS photocatalyst fabricated for 0.5 h (ZnS growth time) achieved a H 2 production rate of 1650 μmol g –1 h –1 . Chen et al also reported that g-C 3 N 4 modified with CoFe 2 O 4 exhibited almost 3 times increment in H 2 production activity in comparison with pure g-C 3 N 4 , with an apparent quantum yield of 3.5% .…”

Section: Introductionmentioning

confidence: 99%

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Environmentally Sustainable Synthesis of a CoFe₂O₄–TiO₂/rGO Ternary Photocatalyst: A Highly Efficient and Stable Photocatalyst for High Production of Hydrogen (Solar Fuel)

et al. 2019

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Herein, a magnetically separable reduced graphene oxide (rGO)-supported CoFe 2 O 4 –TiO 2 photocatalyst was developed by a simple ultrasound-assisted wet impregnation method for efficient photocatalytic H 2 production. Integration of CoFe 2 O 4 with TiO 2 induced the formation of Ti 3+ sites that remarkably reduced the optical band gap of TiO 2 to 2.80 eV from 3.20 eV. Moreover, the addition of rGO improved the charge carrier separation by forming Ti–C bonds. Importantly, the CoFe 2 O 4 –TiO 2 /rGO photocatalyst demonstrated significantly enhanced photocatalytic H 2 production compared to that from its individual counterparts such as TiO 2 and CoFe 2 O 4 –TiO 2 , respectably. A maximum H 2 production rate of 76 559 μmol g –1 h –1 was achieved with a 20 wt % CoFe 2 O 4 - and 1 wt % rGO-loaded TiO 2 photocatalyst, which was approximately 14-fold enhancement when compared with the bare TiO 2 . An apparent quantum yield of 12.97% at 400 nm was observed for the CoFe 2 O 4 –TiO 2 /rGO photocatalyst under optimized reaction conditions. This remarkable enhancement can be attributed to synergistically improved charge carrier separation through Ti 3+ sites and rGO support, viz., Ti–C bonds. The recyclability of the photocatalyst was ascertained over four consecutive cycles, indicating the stability of the photocatalyst. In addition, it is worth mentioning that the photocatalyst could be easily separated after the reaction using a simple magnet. Thus, we believe that this study may open a new way to prepare low-cost, noble-metal-free magnetic materials with TiO 2 for sustainable photocatalytic H 2 production.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Environmentally Sustainable Synthesis of a CoFe₂O₄–TiO₂/rGO Ternary Photocatalyst: A Highly Efficient and Stable Photocatalyst for High Production of Hydrogen (Solar Fuel)

et al. 2019

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“…SCN possesses an irregular sheet-like structure based on Figure 2a,b [40][41][42]. As shown in Figure 2c,d, CoFe2O4 exhibits irregular aggregates with particles ranging from 10.5 to 53 nm due to their strong magnetic properties and the dipole-dipole interactions between the magnetic aggregates [38,43,44]. Figure 2e,f shows that the SCN/CoFe2O4 nanocomposite consists of aggregated nanoparticles embedded in the sheet-like SCN.…”

Section: Sonocatalytic Degradation Of Organic Dyesmentioning

confidence: 93%

Ultrasonically Induced Sulfur-Doped Carbon Nitride/Cobalt Ferrite Nanocomposite for Efficient Sonocatalytic Removal of Organic Dyes

et al. 2020

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The sulfur-doped carbon nitride/cobalt ferrite nanocomposite (SCN/CoFe2O4) was prepared via ultrasonication and studied for the sonocatalytic degradation of wastewater organic dye pollutants including methylene blue, rhodamine B, and Congo red. The X-ray photoelectron spectroscopy confirmed the presence and atomic ratios of S, C, N, Co, Fe, and O elements and their corresponding bonds with Co2+ and Fe3+ cations. The nanocomposite was found to have aggregated nanoparticles on a sheet-like structure. The bandgap energy was estimated to be 1.85 eV. For the sonocatalytic degradation of 25-ppm methylene blue at 20 kHz, 1 W and 50% amplitude, the best operating condition was determined to be 1 g/L of catalyst dosage and 4 vol % of hydrogen peroxide loading. Under this condition, the sonocatalytic removal efficiency was the highest at 96% within a reaction period of 20 min. SCN/CoFe2O4 outperformed SCN and CoFe2O4 by 2.2 and 6.8 times, respectively. The SCN/CoFe2O4 nanocomposite was also found to have good reusability with a drop of only 7% after the fifth cycle. However, the degradation efficiencies were low when tested with rhodamine B and Congo red due to difference in dye sizes, structural compositions, and electric charges.

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“…The ZnS shell deposited on a magnetic core decreases the magnetic saturation of core-shell microspheres. CoFe 2 O 4 @ZnS nanoparticles exhibit superparamagnetic properties where no residual magnetism is left after repeated use of the photocatalyst [73]. Figure 6 shows the dispersion and magnetic separation of calcinated CoFe 2 O 4 @ZnS-0.5h photocatalyst.…”

Section: Magnetic Materials-based Composite Photocatalystsmentioning

confidence: 99%

Recent Progress on Metal Sulfide Composite Nanomaterials for Photocatalytic Hydrogen Production

Lee

Chang

2019

Catalysts

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Metal sulfide-based photocatalysts have gained much attention due to their outstanding photocatalytic properties. This review paper discusses recent developments on metal sulfide-based nanomaterials for H2 production, acting as either photocatalysts or cocatalysts, especially in the last decade. Recent progress on key experimental parameters, in-situ characterization methods, and the performance of the metal sulfide photocatalysts are systematically discussed, including the forms of heterogeneous composite photocatalysts, immobilized photocatalysts, and magnetically separable photocatalysts. Some methods have been studied to solve the problem of rapid recombination of photoinduced carriers. The electronic density of photocatalysts can be investigated by in-situ C K-edge near edge X-ray absorption fine structure (NEXAFS) spectra to study the mechanism of the photocatalytic process. The effects of crystal properties, nanostructure, cocatalyst, sacrificial agent, electrically conductive materials, doping, calcination, crystal size, and pH on the performance of composite photocatalysts are presented. Moreover, the facet effect and light trapping (or light harvesting) effect, which can improve the photocatalytic activity, are also discussed.

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CoFe 2 O 4 @ZnS core–shell spheres as magnetically recyclable photocatalysts for hydrogen production

Cited by 47 publications

References 38 publications

Environmentally Sustainable Synthesis of a CoFe₂O₄–TiO₂/rGO Ternary Photocatalyst: A Highly Efficient and Stable Photocatalyst for High Production of Hydrogen (Solar Fuel)

Environmentally Sustainable Synthesis of a CoFe₂O₄–TiO₂/rGO Ternary Photocatalyst: A Highly Efficient and Stable Photocatalyst for High Production of Hydrogen (Solar Fuel)

Ultrasonically Induced Sulfur-Doped Carbon Nitride/Cobalt Ferrite Nanocomposite for Efficient Sonocatalytic Removal of Organic Dyes

Recent Progress on Metal Sulfide Composite Nanomaterials for Photocatalytic Hydrogen Production

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CoFe 2 O 4 @ZnS core–shell spheres as magnetically recyclable photocatalysts for hydrogen production

Cited by 47 publications

References 38 publications

Environmentally Sustainable Synthesis of a CoFe2O4–TiO2/rGO Ternary Photocatalyst: A Highly Efficient and Stable Photocatalyst for High Production of Hydrogen (Solar Fuel)

Environmentally Sustainable Synthesis of a CoFe2O4–TiO2/rGO Ternary Photocatalyst: A Highly Efficient and Stable Photocatalyst for High Production of Hydrogen (Solar Fuel)

Ultrasonically Induced Sulfur-Doped Carbon Nitride/Cobalt Ferrite Nanocomposite for Efficient Sonocatalytic Removal of Organic Dyes

Recent Progress on Metal Sulfide Composite Nanomaterials for Photocatalytic Hydrogen Production

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Environmentally Sustainable Synthesis of a CoFe₂O₄–TiO₂/rGO Ternary Photocatalyst: A Highly Efficient and Stable Photocatalyst for High Production of Hydrogen (Solar Fuel)

Environmentally Sustainable Synthesis of a CoFe₂O₄–TiO₂/rGO Ternary Photocatalyst: A Highly Efficient and Stable Photocatalyst for High Production of Hydrogen (Solar Fuel)