Comparison of different phases of bismuth silicate nanofibers for photodegradation of organic dyes

Abstract

Two different phases of bismuth silicate nanofibers [Bi 2 SiO 5 and Bi 4 (SiO 4 ) 3 ] were synthesized using electrospinning technique. BS nanofibers were tested for the photocatalytic degradation of methyl orange and safranin O dyes. Different phases of BS affect the photodegradation efficiency of nanofibers. Impressive enhancement in photocatalytic efficiency and BET surface area of Bi 4 (SiO 4 ) 3 was observed over Bi 2 SiO 5 . A speedy reduction in dyes concentration was attributed to the rapid formation of oxygenated radicals by the capture of electrons and holes, generated in the BS nanofiber by UV irradiation. Therefore, the photocatalytic mechanism was elucidated using impedance spectroscopy at room temperature. The lower impedance value of Bi 4 (SiO 4 ) 3 nanofibers had improved high-efficiency charge transfer capability. The cycling efficiency (30 times) and recovery characteristics pointed out that Bi 4 (SiO 4 ) 3 nanofibers photocatalysts had high constancy, resilience, and regeneration ability.

Study of electric conduction mechanisms in bismuth silicate nanofibers

“…The whole solution was stirred for about 90 minutes in a capped beaker. The final solution was loaded into a syringe and a voltage of 10 kV was applied between the tip of the needle and collector plate 13,14 . As spun PVP/ bismuth silicate nanofibers were collected on a copper plate.…”

Electrochemical Study of Semiconductor Properties for Bismuth Silicate-Based Photocatalysts Obtained via Hydro-/Solvothermal Approach

“…They focused on the influence of pH and redox potential of electrolyte on the measured results and revealed that the negative flat-band potential increases with the increase in the redox potential of the electrolyte used. Additionally, for electrolytes containing Fe(CN) 6 4− and I − species, the specific adsorption of the anions was found to cause significant changes in Helmholtz potential, thus affecting flat-band potential values [42].…”

“…Bismuth silicates (Bi 2 SiO 5 , Bi 12 SiO 20 , Bi 4 Si 3 O 12 , etc.) and their composites seem to be promising photocatalysts [6][7][8][9], which is due to their activity in the visible range [10] and high polarization and internal electric field [11,12], as well as their ability to form effective junctions (S-scheme [13], type-II [14]), and so on. Previously, we obtained bismuth silicate (BSO)-based materials via mechanical activation [15] and laser fragmentation [16].…”

The highly stable construction of Pt/FeVO4 heterostructure with improving photocatalytic performance and growth mechanism for •O2 and •OH production based on Electron Spin Resonance study

“…For photocatalytic activity, the photocatalyst surface area has a signi cant in uence on the degradations of pollutants [1,[38][39][40][41], since the greater surface area has a higher ability to absorb dye pollutants from the solution which consequently increases the reaction rate and enhances the degradation response. The N 2 adsorption-desorption curve was generated from Brunauer-Emmett-Teller (BET) analysis to calculate surface area.…”