Study On Preparation And Catalytic Activity Of Vanadium Catalysts From Stone Coal

coal is an unique kind of vanadium-containing ore, but60%of the coal is notreached industrial exploitation value as its low grade. Therefore, extraction andutilizaton vanadium form the low-grade stone coal have a high practical significance.Photocatalyst technologies are used as ideal environment pollution control technologieswhich degradate the environmental pollutants and improve the recycling of energy.However, the photocatalytic properties of vanadium pentoxide which extracted fromstone coal is low, so it has very important significance that use the vanadium whichextracted form stone coal as as a source of vanadium to prepare efficient photocatalyst.BiVO4as a novel vanadium-containing semiconductor photocatalysts, it has stablephotochemical performance, strong redox capacity, which has become a hot researchfield of visible light catalysis. In order to improve the photocatalytic activity of BiVO4,many researchers had done some doping research, but these doped BiVO4weremodified to improve the catalytic performance, but it can not solve the recycle rate andseparation problem. Therefore load magnetic material on BiVO4catalyst could improvethe photocatalytic activity of the catalyst, it could also improve the recovery efficiencyand reduce production costs simultaneously.This paper use solvent extraction to prepare vanadium from stone coal, theexperiment mainly on the effects of different organic match and aqueous phaseequilibrium pH on the enrichment of vanadium, and the sample was subjected withXRD, FT-IR analysis tests and so on, the results showed that the optimum ratio oforganic phase was used for extraction:25%P204+5%TBP+70%sulfonated kerosene,pH value of the aqueous phase should be controlled at about2.5, the extraction rate ofvanadium reached about85%, the prepared vanadium pentoxide had high purity about80%, the entire process of vanadium extraction rate was92.8%.Vanadium which extracted form stone coal was used as vanadium source to prepareBiVO4photocatalyst, the experiment mainly on the effects of the amount of tartaric acid.the sample was subjected with XRD, SEM, UV-vis tests. the results showed that whenthe molar ratio of V and tartaric acid was1:2, BiVO4had a high catalytic activity, thedegradation rate of methylene blue was90.2%after5h.SrFe12O19was used as magnetic particle to prepared BiVO4/SrFe12O19magneticphotocatalyst, the sample through a series of characterization methods to investigate onits surface morphology, catalytic properties and the recovery rate. The results showed that the degradation rate of methylene blue for5h was93.3%within15%BiVO4/SrFe12O19. BiVO4/SrFe12O19magnetic photocatalyst had excellent magneticproperties which can easily be separated and recovered, the recovery rate after repeatedfive times was reached92.3%, the degradation rate of methylene blue was more than60%. Fitting BiVO4/SrFe12O19degradation of methylene blue curve showed that thedegradation reaction follow the first-orde kinetics model.