Search

A novel magnetic FeO/BiOI hybrid nanostructure was fabricated by combining electrospinning and successive ionic layer adsorption and reaction (SILAR) method. Hollow FeO nanofibers with internal diameter around 50 nm were produced by using electrospinning and calcinations of the as-spun fibers at 450 °C for 2 h. BiOI was deposited on the FeO nanofiber surface by SILAR method, and the BiOI quantity could be controlled by the growth cycles of SILAR. Similar synthetic procedure could also be used to prepare FeO/BiOBr and FeO/BiOCl hybrid nanostructures. The BiOI on the magnetic nanofiber surface is highly crystalline with lamellae morphology of around 16 nm in thickness from the X-ray diffraction and scanning electron microscopy detections. The obtained FeO/BiOI hybrid nanostructures exhibit superior visible light catalytic performance toward decomposition of RhB. This new method, which can also be used to prepare other magnetic photocatalyst simply at low cost, is suitable for practical applications. [ABSTRACT FROM AUTHOR]

• Bi 4 Ti 3 O 12 /C/Bi 2 S 3 /MoS 2 composites with amorphous carbon interlayer were constructed by electrospinning and hydrothermal methods. • The carbon interlayer could not only suppress the formation of Bi 2 S 3 but also accelerate the charge separation. • The photocatalytic activity was significantly enhanced by the introduction of the carbon interlayer. Fabricating heterojunctions by combining with MoS 2 is efficient to boost the visible light photocatalytic activity of Bi 4 Ti 3 O 12 (BTO) but limited by the concurrent formation of Bi 2 S 3 nanorods by in-situ ion exchange reaction. An amorphous carbon interlayer that can effectively protect the BTO fibrous structure and suppress the Bi 2 S 3 generation was introduced to construct Bi 4 Ti 3 O 12 /C/Bi 2 S 3 /MoS 2 (BCBM) composites with enhanced photocatalytic activity. The BCBM fibers were fabricated by electrospinning and subsequent hydrothermal growth of carbon and MoS 2. Owing to the important roles of carbon interlayer to keep the integrity of the BTO fibrous structure and provide charge transfer channel, fast separation of photoinduced carriers happens on the semiconductor interface between BTO and MoS 2 to improve the visible light photocatalytic activity. The optimum BCBM displays a photocatalytic efficiency of 88.4% and apparent constant of 0.0148 min−1 towards degrading RhB, which are much higher relative to the Bi 4 Ti 3 O 12 /Bi 2 S 3 /MoS 2 composites prepared without the carbon interlayer. Moreover, it is demonstrated that the thickness of carbon interlayer is crucial for fabricating high-performance BTO heterojunctions with MoS 2. The design and results in this work may broaden the horizon to construct the Bi-based semiconductor photocatalyst with high photocatalytic performance. Amorphous carbon interlayer that can effectively protect the Bi 4 Ti 3 O 12 fibrous structure and suppress the Bi 2 S 3 generation was introduced to construct Bi 4 Ti 3 O 12 /C/Bi 2 S 3 /MoS 2 composites with enhanced photocatalytic activity. [Display omitted] [ABSTRACT FROM AUTHOR]

Graphical abstract CoFe 2 O 4 /BiOI fiber photocatalysts, prepared by decorating BiOI nanoplates on electrospun CoFe 2 O 4 fiber surface through both SILAR and solvothermal methods exhibit high magnetic response and visible light photocatalytical activity toward degradation of RhB. Abstract A facile methodology for fabricating novel magnetic fibrous visible light photocatalysts CoFe 2 O 4 /BiOI (CFO/BiOI) is presented. The fabrication procedure involves production of electrospun CoFe 2 O 4 nanofibers and subsequent controllable decoration of BiOI nanoplates by both the successive ionic layer adsorption and reaction (SILAR) and solvothermal methods on CoFe 2 O 4 nanofiber surface. The BiOI nanoplates on the fiber surface obtained by two methods are highly crystallized with lamellae morphology. The resulting CFO/BiOI fibers exhibit strongly magnetic response to external magnetic field and can be quickly collected. All the CFO/BiOI fiber samples exhibit excellent visible light photocatalytic performance towards degrading RhB regardless of the preparation methods, in which h+ and O2− play the major roles examined by the trapping experiment. Above 80% RhB dyes can be degraded within 2 h after 3 cycles under visible light irradiation, suggesting the good reusability of the photocatalysts. This work demonstrates that the CFO/BiOI is characteristic with high visible light photocatalysis performance and magnetic response, hence is promising for photocatalysis. [ABSTRACT FROM AUTHOR]

We present a novel method to facilely prepare magnetically recoverable AgCl/Fe 3 O 4 @MIL-100(Fe) (ACFM) nanostructures for photocatalytic degradation of rhodamine B (RhB). The ACFM was directly prepared via a simple successive ionic layer adsorption and reaction (SILAR) deposition of MIL-100(Fe) on solvothermal synthesized Ag/Fe 3 O 4 nanoparticles, in which process Ag was completely oxidized into AgCl concurrent with the formation of MIL-100(Fe). The ACFM prepared with 15 SILAR cycles exhibits 92.9% efficiency towards photodegrading RhB within 30 min under visible light illumination, which is higher than that of the individual structure of AgCl/Fe 3 O 4 , Ag/Fe 3 O 4 @MIL-100(Fe) or Fe 3 O 4 @MIL-100(Fe). The remarkably enhanced photocatalytic performance is attributed to the abundant active sites and sufficient visible light response of MIL-100(Fe), as well as effective charge separation at the heterojunction interface between AgCl and MIL-100(Fe). Furthermore, the obtained ACFM can be quickly separated from the pollutant solution with a magnet and possesses good stability for recycling photocatalysis. In light of the study, the ACFM nanostructures are believed to be applied as promising photocatalysts for practical applications. • ACFM was synthesized by concurrent formation of AgCl and MIL-100(Fe). • ACFM displays significantly improved photocatalytic activity. • The ACFM could be easily collected with a magnet for reusage. [ABSTRACT FROM AUTHOR]

Metal ion doping is an efficient method to achieve high photocatalytic performance of semiconductors. However, the current synthetic methods by using inorganic salts as doped sources in the precursor reaction system might suffer from ion waste and second pollution. Herein, we developed a novel method by employing electrospun nanofibers as ion reservoir to release metal ions for the synthesis of ion-doped semiconductors with high photocatalytic activity. As demonstrated, Co/Fe co-doped BiOCl photocatalyst (Co/Fe-BOC) was facilely prepared in the presence of CoFe 2 O 4 nanofibers as Co and Fe ion reservoir via a simple solvothermal method. Compared with BiOCl, the resulted Co/Fe-BOC shows increased specific surface area, visible light response as well as separation and transportation efficiencies of photogenerated carriers. Thus, the Co/Fe-BOC exhibits significantly enhanced visible light photocatalytic activity to degrade 99.4% rhodamine B (RhB) within 4 min. This new doping approach not only avoids the ion waste and pollution during the reaction process but also facilitates the separation of the photocatalyst. Moreover, the CoFe 2 O 4 nanofibers could be repeatedly used as ion reservoir to prepare high-performance Co/Fe-BOC. This nanofiber-based ion doping approach provides a novel, universal and promising insight to obtain doped semiconductors with high photocatalytic activity. [Display omitted] • CoFe 2 O 4 nanofibers were used as ion reservoir for the first time to prepare ion doped semiconductor photocatalyst. • The Co/Fe-BOC displays significantly improved visible light photocatalytic activity to degrade rhodamine B. • The CoFe 2 O 4 nanofibers could be repeatedly used as ion reservoir to prepare high-performance Co/Fe-BOC. [ABSTRACT FROM AUTHOR]

A novel fibrous BiVO 4 /Bi 2 S 3 /MoS 2 heterojunction is facilely constructed by simple electrospinning and hydrothermal processes. Bi 2 S 3 was formed concurrently along with the hydrothermal synthesis of MoS 2 on to the porous structure of BiVO 4 fibers. The BiVO 4 /Bi 2 S 3 /MoS 2 (BBM) heterojunction is organized with MoS 2 nanosheets of several layers in thickness encapsulating both on the Bi 2 S 3 nanorod around 40 ​nm in diameter and fibrous BiVO 4 template. The BiVO 4 /Bi 2 S 3 /MoS 2 heterojunction shows significant enhancement of visible light absorption in the region of 500–800 ​nm and photocurrent of 3 times higher than that of pure BiVO 4. By adjusting the precursor concentration of MoS 2 , the optimized BBM-2 sample presents 4.9 and 9.5 times higher of the photodegradation efficiency and apparent reaction rate constant respectively, than that of pure BiVO 4 fibers after 120 ​min under visible light irradiation. The present work will provide a new strategy to the design of Bi-contained nanofibrous heterojunctions with high photocatalytic activity for the applications in energy storage and conversion. [Display omitted] • BiVO 4 /Bi 2 S 3 /MoS 2 ​heterojunctions are prepared by one-step hydrothermal growth of MoS 2 ​on BiVO 4 ​nanofibers. • BiVO 4 /Bi 2 S 3 /MoS 2 ​fibers show significantly enhanced photocatalytic activity towards decomposing RhB. • The synthetic method is simple and efficient for preparing various Bi-contained composite photocatalysts. [ABSTRACT FROM AUTHOR]