The Synthesis Of BiXO₄（X=V,P）/metal Phthalocyanine Nanofiber And The Photocatalytic Performance

We controlled the crystal phase, morphology, particle size and bandgap of the catalysts by sol-gel, electrospinning and hydrothermal method in this paper. We combined the photoelectrochemical, theoretical calculations, spectroscopy, Mott-schottky and other characterization techniques discussed photogenerated electrons and holes separation on the interface influence the transmission rate of the carrier of the bismuth-based photocatalysts, to reveal the nature of the activity of the catalysts. This work may provide further understanding on the photocatalytic mechanisms for non-TiO2 catalysts.First, we synthesized the BiVO4 microribbon by electrospinning method. The bandgap of the samples prepared ca.2.4 eV. The photodegradation for MB of the microribbon sample was 1.2 times than the BiVO4 powders. The high band position of the sample by electrospinning method is the main reason it has efficient degradation of methylene blue solution.The BiPO4 nanofiber were also prepared by electrospinning method. The nanofiber sample owned higher efficient than the powder by solvthermal method. Inductive Effect of the phosphate favor conduction electron-hole separation and is considered to be the reason of its high activity. Further research also found that raising or lowering of the valence band, resulting in changes in the photocatalytic degradation mechanism is the main factor restricting activity. It might extend to the synthesis of other inorganic nonmetal salts of oxy photocatalysts with suitable band gap and high activity for the environmental purification of organic pollutants in aqueous solution.Broaden the light response range of the semiconductor is favor for improve the performance of semiconductor photocatalysts. We can design highly active photocatalyst instructive from this point. On the basic of this point, we synthesized the iron phthalocyanine/phosphate bismuth, cobalt phthalocyanine/bismuth vanadate heterostructures by electrospinning method combining hydrothermal in the paper. The light absorption of iron phthalocyanine/bismuth phosphate heterostructure is largely broadened than the bismuth phosphate, widened from about 320 nm to 800 nm. EIS and Mott-schottky tests show that the introduction of iron phthalocyanine changed photoelectrochemical properties of bismuth phosphate, making it more efficient light degradation of pollutants. Cobalt phthalocyanine/bismuth vanadate heterostructure increase the BET surface than bismuth vanadate, from about 16m2/g increased to 33m2/g, High specific surface area and cobalt phthalocyanine unique structural properties, making cobalt phthalocyanine/bismuth vanadate heterostructures have higher activity centers and electron-hole separation efficiency and reduces the body’s combound of the electron-hole to achieve the purpose of improving the photocatalytic efficiency.Finally, the bismuth phosphate/graphene composite structure were synthesized by hydrothermal method in this paper in purpose of the regulation of the absorption band edges. The results showed that, after the introduction of the graphene, the band gap results in smaller variations, and obviously changed bismuth phosphate light absorption and electron transport properties, prompting the photogenerated carriers are effectively separated, thereby increasing the photocatalyst activity.