Study on enhanced photocatalytic activity of magnetically recoverable Fe3O4@C@TiO2 nanocomposites with core–shell nanostructure

Zhang, Qi; Meng, Guihua; Wu, Jianning; Li, Deqiang; Li, Yong

doi:10.1016/j.optmat.2015.04.001

Cited by 56 publications

(26 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the widely accepted strategies to achieve better particle dispersion and thus suppress phase transformation as well as exploit interface‐related phenomena is to support small TiO 2 NPs on inert supports oxide materials such as SiO 2 , Fe 2 O 3 , Al 2 O 3 , MoO 3 , and ZrO 2 . SiO 2 is a low cost material, has good thermomechanical stability and is transparent in the UV region where TiO 2 absorbs and is thus preferred material for supporting TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

The stability of titania‐silica interface

Staykov

Ferreira-Neto

Cruz

et al. 2017

Int J of Quantum Chemistry

View full text Add to dashboard Cite

Silica is very often the catalyst support of choice for transition metal oxides such as titania, and specially anatase. Titania is an excellent absorber and photocatalyst for many organic molecules degradation. In order to understand the chemical nature of the interaction between titania and silica, we have performed a theoretical study using density functional theory aiming to elucidate the role on the stability of the interface of the specific type of interactions, H-bonding, covalent bonding of the pristine surfaces, and covalent bonding after silicon and titanium ions interdiffusion. The calculations were carried out for hydrogen and oxygen terminated surface, comparing the bonding types and the forces acting along the interface. The interface dynamics was studied for interfaces under applied stress in order to elucidate their stability and failure limits. The shearing forces and the mechanisms of interface failure were determined. Interfaces with interdiffused Si and Ti ions were studied to improve the interface stabilization. The results demonstrate that high-temperature treatment leading to formation of SiAOATi bonds at the interface is responsible for the formation of strong and flexible binding interaction between both oxides. At high strains, the SiAOATi interface failure is observed due to lattice mismatch between the SiO 2 and TiO 2 .The failure is a result of forces acting orthogonal to the interface shearing. In case of hydrogen terminated surface, the interface binding is a result of hydrogen bond network. Such interface is fragile at moderate shearing forces along the applied strain. The hydrogen bond network decreases the elastic properties and flexibility of the interface. The SiO 2 /TiO 2 interface is further stabilized by Si/Ti ion interdiffusion. The ionic interdiffusion process also increases the interface flexibility. Thus, in order to obtain more stable anatase photocatalyst supported on silica, the synthetic routes should favor silicon and titanium ions interdiffusion along the interface. K E Y W O R D S density functional theory, interface, silica, titania | I N TR ODU C TI ONTiO 2 is one of the most widely used semiconductor materials finding widespread application in materials chemistry, heterogeneous catalysis, photocatalysis, and many other fields. [1][2][3][4][5] The widespread use of TiO 2 in different fields stems from its low cost, good thermochemical stability, and suitable optical and electronic properties. The discovery of photocatalytic water-splitting on anatase surface under UV illumination [6] led to a new era of TiO 2 -based heterogeneous photocatalysis [2,3,5,[7][8][9][10] and huge efforts have been directed to improve the quantum yield of the process as well as extend the light harvesting ability of TiO 2 to the visible region of the spectrum. [11][12][13][14] Since the efficiency of the photocatalytic process greatly depends on the physical properties of the photocatalyts, [5,[15][16][17] many strategies have been proposed to achieve the formation of TiO 2 nanoparticle...

show abstract

Section: Introductionmentioning

confidence: 99%

The stability of titania‐silica interface

Staykov

Ferreira-Neto

Cruz

et al. 2017

Int J of Quantum Chemistry

View full text Add to dashboard Cite

show abstract

“…The degradation of RhB was obviously enhanced in the presence of Fe 3 O 4 /TiO 2 nanocomposites, indicating that the presence of Fe 3 O 4 in the sample can reduce the band gap and enhance visible light photocatalytic activity. Furthermore, the presence of organic molecules in Fe 3 O 4 /TiO 2 nanocomposites can inhibit the photodissolution [38], leading to high photocatalytic activity of Fe 3 O 4 /TiO 2 nanocomposites. The possible reason for this phenomenon is that with the increase of Fe 3 O 4 content in the composite, TiO 2 can’t completely envelope the Fe 3 O 4 inside.…”

Section: Resultsmentioning

confidence: 99%

“…The possible reason for this phenomenon is that with the increase of Fe 3 O 4 content in the composite, TiO 2 can’t completely envelope the Fe 3 O 4 inside. Under light irradiation, the strong photocatalytic reaction of TiO 2 erodes the inert insulating organic layer, and the Fe 3 O 4 magnetic core then has direct contact with TiO 2 , which leads to the occurrence of photodissolution [38] and the decrease of photocatalytic activity.…”

Section: Resultsmentioning

confidence: 99%

Recyclable Magnetic Titania Nanocomposite from Ilmenite with Enhanced Photocatalytic Activity

et al. 2017

View full text Add to dashboard Cite

Using ilmenite as a raw material, iron was converted into Fe3O4 magnetic fluid, which further was combined with titanium filtrate by a solvothermal method. Finally Fe3O4/TiO2 nanocomposites with the uniform size of 100–200 nm were prepared. This approach uses rich, inexpensive ilmenite as a titanium and iron source, which effectively reduces the production cost. The crystal structure, chemical properties and morphologies of the products were characterized by SEM, TEM, XRD, FTIR, BET, UV-Vis, XPS and VSM. The novel photocatalyst composed of face-centered cubic Fe3O4 and body-centered tetragonal anatase–TiO2 exhibits a spherical shape with porous structures, superparamagnetic behavior and strong absorption in the visible light range. Using the degradation reaction of Rhodamine B (RhB) to evaluate the photocatalytic performance, the results suggest that Fe3O4/TiO2 nanocomposites exhibit excellent photocatalytic activities and stability under visible light and solar light. Moreover, the magnetic titania nanocomposites displayed good magnetic response and were recoverable over several cycles. Based on the trapping experiments, the main active species in the photocatalytic reaction were confirmed and the possible photocatalytic mechanism of RhB with magnetic titania was proposed. The enhanced photocatalytic activity and stability, combined with excellent magnetic recoverability, make the prepared nanocomposite a potential candidate in wastewater purification.

show abstract

“…reported that yolk–shell‐structured Fe 3 O 4 /C@F–TiO 2 microspheres with a fluorinated surface can be used as recyclable visible‐light‐driven photocatalysts. Liu et al . reported that the presence of a carbon interlayer can prevent the occurrence of photodissolution.…”

Section: Introductionmentioning

confidence: 99%

Controlled Synthesis of Recyclable, Porous FMO/C@TiO₂ Core–Shell Nanofibers with High Adsorption and Photocatalysis Properties for the Efficient Treatment of Dye Wastewater

et al. 2016

View full text Add to dashboard Cite

One‐dimensional magnetite/manganese iron oxide modified by carbon coating and with TiO2 nanoparticles into core–shell composite nanofibers (FMO/C@TiO2) with porous structure were fabricated using organometallic compounds as templates. The structure and physicochemical properties of the as‐obtained composite nanofibers were characterized by a series of techniques, including X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption–desorption isotherms, X‐ray photoelectron spectroscopy and UV/Vis diffuse reflectance. The results demonstrate that the one‐dimensional core–shell structure was formed by coating TiO2 nanoparticles onto a substrate of FMO/C nanofibers. The porous nanostructures and photoresponse range of the composite nanofibers can be controlled by varying the proportion of both template and titanium source. The resultant composite nanofibers exhibited highly efficient removal of dye from wastewater by combining adsorption and photocatalysis processes. In addition, the composite nanofibers are superparamagnetic, and can be recovered by magnet easily with almost no decline in the removal efficiency. The facile synthesis strategy used here might provide a universal and efficient method to fabricate one‐dimensional magnetic nanocomposites with porous structures for various functional applications.

show abstract

Study on enhanced photocatalytic activity of magnetically recoverable Fe3O4@C@TiO2 nanocomposites with core–shell nanostructure

Cited by 56 publications

References 35 publications

The stability of titania‐silica interface

The stability of titania‐silica interface

Recyclable Magnetic Titania Nanocomposite from Ilmenite with Enhanced Photocatalytic Activity

Controlled Synthesis of Recyclable, Porous FMO/C@TiO₂ Core–Shell Nanofibers with High Adsorption and Photocatalysis Properties for the Efficient Treatment of Dye Wastewater

Contact Info

Product

Resources

About

Study on enhanced photocatalytic activity of magnetically recoverable Fe3O4@C@TiO2 nanocomposites with core–shell nanostructure

Cited by 56 publications

References 35 publications

The stability of titania‐silica interface

The stability of titania‐silica interface

Recyclable Magnetic Titania Nanocomposite from Ilmenite with Enhanced Photocatalytic Activity

Controlled Synthesis of Recyclable, Porous FMO/C@TiO2 Core–Shell Nanofibers with High Adsorption and Photocatalysis Properties for the Efficient Treatment of Dye Wastewater

Contact Info

Product

Resources

About

Controlled Synthesis of Recyclable, Porous FMO/C@TiO₂ Core–Shell Nanofibers with High Adsorption and Photocatalysis Properties for the Efficient Treatment of Dye Wastewater