Activity For Decomposition Of Rhodamine Research Articles

Tunable morphology, bandgap, photocatalysis and magnetic properties of Bi6Fe2Ti3O18 nanocrystals by doping cobalt ions

At present, the researchers pay much more attention on thin films and ceramics of Bi6Fe2Ti3O18 with different element doping, not nanomateials. Therefore in this work, the single-crystalline Bi6Fe2-xCoxTi3O18 (BFCTO) (x = 0–0.5) nanocrystals were synthesized successfully by the hydrothermal method. As the Co ions doping concentration increase, the main morphology of BFCTO nanocrystals changed from nanoplate to nanosheet. Meanwhile, doping Co ions in the BFTO can efficiently reduce the band gap of products. As the Co ions doping concentration increase to x = 0.5, the corresponding bandgap is shorten from 2.576 to 2.201eV. Besides, the BFCTO-0.5 sample exhibited optimal ultraviolet (UV)-light-driven photocatalytic activity for decomposition of rhodamine B (RhB). At room temperature, upon Co doping, the samples have spontaneous magnetic moments, indicating the ferromagnetic nature. The hysteresis loop of BFCTO-0.2 and BFCTO-0.1 nanocrystals obtained the maximum remnant magnetization 2Mr of 0.27emu/g and the maximum coercive field 2Hc of 1600Oe, respectively. The BFCTO-0.5 nanocrystal performed the best ferromagnetism with a saturated magnetization Ms of 2.15emu/g. All the results indicate the BFCTO nanocrystals have potential applications in data storage, sensors and nanodevices.

Synthesis, Characterization and Catalytic Properties of Attapulgite/CeO2 Nanocomposite Films for Decomposition of Rhodamine B.

ATP(attapulgite)/CeO2 nanocomposite films were prepared on the glass substrates via a sol-gel and dip-coating route. The ATP/CeO2 nanocomposite films were characterized by Powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), transmission electron microscopy (TEM), atomic force microscopy (AFM) and fourier transform infrared spectroscopy (FT-IR). The results showed that the ATP/CeO2 nanocomposite films were free from cracks and the nanoparticles were attached onto the surface of attapulgite. The ATP/CeO2 nanocomposite films displayed excellent catalytic activity for decomposition of Rhodamine B. The COD (chemical oxygen demand) removal rate of rhodamine B using ATP/CeO2 nanocomposite films as catalyst reached as high as 94% when the weight ratio of ATP to CeO2 was 2:1.

Ternary reduced-graphene-oxide/Bi2MoO6/Au nanocomposites with enhanced photocatalytic activity under visible light

A novel ternary nanocomposite photocatalyst consisted of reduced-graphene-oxide (RGO), Bi2MoO6 and plasmonic Au nanoparticles were successfully fabricated by multiple steps including a simple solvothermal process and photochemical reduction process. RGO/Bi2MoO6/Au was characterized by X-ray powder diffraction patterns, transmission electron microscopy, UV–vis diffuse reflectance spectra, Raman spectroscopy and X-ray photoelectron spectroscopy. In comparison with Bi2MoO6, RGO/Bi2MoO6 and Au/Bi2MoO6, RGO/Bi2MoO6/Au exhibits an enhanced photocatalytic activity for decomposition of Rhodamine B under visible light. The separation efficiency of the photogenerated holes and electrons on Bi2MoO6 is promoted by the combined effect of both RGO and Au in the ternary composite, and thus enhances photocatalytic activity. The scavenger study revealed that both hole and superoxide are the major reactive species for the photocatalytic degradation of Rhodamine B using RGO/Bi2MoO6/Au photocatalyst.

Bi4Ti3O12 nanofibers–BiOI nanosheets p–n junction: facile synthesis and enhanced visible-light photocatalytic activity

A novel p-n junction photocatalyst of Bi4Ti3O12 nanofibers-BiOI nanosheets has been fabricated through a simple and economical technique of electrospinning combined with a successive ionic layer adsorption and reaction (SILAR) process. The products are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectra (DRS), and photoluminescence (PL) spectroscopy. The as-formed Bi4Ti3O12 nanofibers are composed of inter-linked nanoparticles of 50-80 nm in size. The thickness of the as-grown BiOI nanosheets is about 10 nm and the size of the BiOI nanosheets increases with the SILAR cycles. In particular, many {001} facets of BiOI nanosheets are exposed, which is favorable to enhance the visible-light photocatalytic activity. The p-n junction photocatalyst exhibits enhanced visible-light-driven photocatalytic activity for decomposition of rhodamine B (RhB) and phenol. The enhanced photocatalytic activity can be attributed to the extended absorption in the visible light region resulting from the BiOI nanosheets and the effective separation of photogenerated carriers driven by the photo-induced potential difference generated at the Bi4Ti3O12-BiOI p-n junction interface.

One-step preparation of bismuth tungstate nanodisks with visible-light photocatalytic activity

Bismuth Tungstate (Bi2WO6) nanodisks were synthesized using Bi (NO3)3·5H2O and Na2WO4·2H2O as starting materials by a one-step hydrothermal process in the presence of ethylene glycol. The prepared sample was characterized by powder X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), Brunauer–Emmett–Teller (BET) measurement, Fourier transform infrared spectroscopy (FTIR) and UV–visible diffuse reflectance spectrum (DRS). The prepared Bi2WO6 nanodisks consist of fine particles and possess an optical band gap of 2.76eV. The photocatalytic experiment demonstrates that the prepared Bi2WO6 nanodisks exhibit high photocatalytic activity for decomposition of Rhodamine B under visible-light, which is ascribed to the unique shaped structures as well as narrow optical band gap.

Synthesis and photocatalytic properties of the graphene–La 2Ti 2O 7 nanocomposites

Graphene–La 2Ti 2O 7 nanocomposites used as photocatalyst were prepared via a two-step process in this paper. Graphite oxide was firstly exfoliated via thermal expanding process under 1000 °C, then the expanded graphite was reduced by La 2Ti 2O 7 nanosheets under UV light irradiation. The as-prepared graphene–La 2Ti 2O 7 nanocomposites were characterized by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), BET surface area analyzer, Raman spectroscopy, Fourier transformation infrared (FTIR) spectroscopy and UV–vis diffuse spectroscopy. The composites exhibited an enhanced photocatalytic activity for decomposition of rhodamine B (RhB) under UV-irradiation compared to pure La 2Ti 2O 7 materials, which was attributed to the increase in the charge separation efficiency in the presence of graphene and the large surface contact between graphene and La 2Ti 2O 7.

Characterization and Visible-Light Photocatalytic Activity of Nano-Bi<sub>2</sub>MoO<sub>6</sub> Catalysts Prepared by Hydrothermal Process

The Nano-Bi2MoO6was prepared using Bi(NO3)3•5H2O and Na2MoO4•2H2O as starting materials by a hydrothermal process. The prepared Bi2MoO6product was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-visible diffuse reflectance spectroscopy (DRS). It was found that the prepared nano-Bi2MoO6show narrow band gap of 2.88 eV. Consequently, the prepared nano-Bi2MoO6show high visible-light photocatalytic activity for decomposition of Rhodamine B in comparison with the commercial Degussa P25, which was ascribed to the visible-light absorption.