Synthesis of manganese vanadate nanobelts and their visible light photocatalytic activity for methylene blue

Abstract

Manganese vanadate nanobelts have been synthesised by a simple hydrothermal process using polymer polyvinyl pyrrolidone as the surfactant by adjusting the pH value. The X-ray diffraction, selected area electron diffraction and the highresolution transmission electron microscopy (TEM) show that the manganese vanadate nanobelts are composed of a single crystalline monoclinic Mn 2 V 2 O 7 phase. Scanning electron microscopy and TEM observations show that the thickness, width and length of the nanobelts are 20 nm, 350 nmÀ1 mm and several dozens to several hundreds of micrometres, respectively. The photocatalytic activities of the manganese vanadate nanobelts have been evaluated by the photocatalytic degradation of methylene blue (MB) in an aqueous solution as a model pollutant under the solar light irradiation. After 4 h of the irradiation by the solar light, the MB solution with the volume of 10 mL and the concentration of 10 mg¢mL ¡1 can be totally degraded using 10 mg manganese vanadate nanobelts.

Insight into Potassium Vanadates as Visible-Light-Driven Photocatalysts: Synthesis of V(IV)-Rich Nano/Microstructures for the Photodegradation of Methylene Blue

“… 14 − 17 A series of compounds can be mentioned here, such as Ag 3 VO 4 , 18 AgV 7 O 18 , 19 CuV 2 O 6 , 20 FeVO 4 , 21 Cd 2 V 2 O 7 , 22 InVO 4 , 23 GdVO 4 , 24 and BiVO 4 25 , 26 as the most known representatives from the vanadate family. The conducted research is mainly devoted to the nanostructured vanadates, which can appear in various forms such as nanoparticles, 27 , 28 nanobelts, 29 , 30 or nanotubes. 31 It is well known that the shape and size play a significant role, as broadly described in the literature.…”

Photocatalytic Processes for Environmental Applications

“…However, Mn 2 V 2 O 7 has attracted attention not only for its electrochemical performance but also for its optical properties. There are two phases of this manganese vanadate: monoclinic β-Mn 2 V 2 O 7 and triclinic α-Mn 2 V 2 O 7 [178,179]. β-Mn 2 V 2 O 7 exhibits an energy band gap of about 1.2 eV while α-Mn 2 V 2 O 7 has a larger E g (1.8 eV) [178,180].…”

Effective oil–water mixture separation and photocatalytic dye decontamination through nickel-dimethylglyoxime microtubes coated superhydrophobic and superoleophilic films

“…† The as-prepared [Ni(DMG) 2 ] lms not only exhibit excellent photocatalytic properties but also exhibit excellent stability and reusability compared with transition metal complex-based catalysts such as MnV 2 O 6 (ref. 33) or Ag 3 PO 4 . 34 Furthermore, the as-prepared [Ni(DMG) 2 ] lms also exhibited superhydrophobicity and superoleophilicity.…”