Synthesis And Photocatalvtic Properties Of Nano-Heteropoly Acid Bismuth/Amidoxime Fiber Composites

Nowadays,The main problem facing humanity is environmental and energy issues.The Semiconductor photocatalysis in environmental purification and utilization of solar energy plays an increasingly important role.The key point of this technology is the preparation of photocatalyst.This article was prepared photocatalyst mainly liquid phase,and then to amidoxime of polyacrylonitrile fiber as a ligand,using its-NH2 and-OH and Bi(Ⅲ)is coordinated so that the nano heteropolyacid bismuth(BiV04,Bi2W06 and Bi2Mo06)by coordinating role in the success of loading surface amidoxime fiber can be obtained nano heteropolyacid bismuth/amidoxime fiber.Degradation of Rhodamine B dye solution with the goal to study the synthesis reaction time,temperature and the addition ratio of the heteropoly acid and bismuth amidoxime fiber to determine the optimum preparation conditions of nano heteropoly acid bismuth/amidoxime fiber.The structure and composition of the product were determined by scanning electron microscopy(SEM),energy dispersive spectrometry(EDS),powder X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),UV-Vis diffuse reflectance spectroscopy(UV-vis).Rhodamine B,methylene blue,methyl orange and yellow activity as simulated contaminants to investigate the catalyst degradation for different dyes.And the optimal catalytic conditions the catalyst were studied.(1)Synthesis and photocatalytic properties of nano-BiVO4/amidoxime fiber compositesThe best preparation condition of BiVO4/AOCF were:1.0 mmol Bi(N03)3 and 1.0 mmol NH4VO3 at 60 ℃ for 32 h.The band gap of BiV04 is narrowed by the coordination compound of AOCF and BiV04,not only more conducive to absorption of visible light,but also makes BiV04/AOCF on the photocatalytic activity as compared to BiVO4 has significantly improved.The results of photodegrading rhodamine B,eactive yellow,methylene blue and methyl orange showed that BiVO4/AOCF has good photocatalytic degradation and the catalytic activity is better in acidic condition.BiVO4/AOCF is easy to be recycled and reused,and after repeated 5 times for Rh B degradation was still up to 96.3%.The photocatalytic reaction accorded with first-order kinetics.(2)Synthesis and photocatalytic properties of nano-Bi2WO6/amidoxime fiber compositesThe best preparation condition of Bi2WO6/AOCF were:1.0 mmol Bi(NO3)3 and 0.5 mmol Na2WO4 at 70 ℃ for 24 h.The band gap of Bi2WO6 is narrowed by the coordination compound of AOCF and Bi2WO6,not only more conducive to absorption of visible light,but also makes Bi2W06/AOCF on the photocatalytic activity as compared to Bi2W06 has significantly improved.The results of photodegrading rhodamine B,eactive yellow,methylene blue and methyl orange showed that Bi2WO6/AOCF has good photocatalytic degradation and the catalytic activity is better in acidic condition.Bi2WO6/AOCF is easy to be recycled and reused,and after repeated 5 times for Rh B degradation was still up to 97%.The photocatalytic reaction accorded with first-order kinetics.(3)Synthesis and photocatalytic properties of nano-Bi2Mo06/amidoxime fiber compositesThe best preparation condition of Bi2MoO6/AOCF were:1.0 mmol Bi(NO3)3 and 0.5 mmol Na2Mo04 at 120 ℃ for 32 h.The band gap of Bi2Mo06 is narrowed by the coordination compound of AOCF and Bi2Mo06,not only more conducive to absorption of visible light,but also makes Bi2Mo06/AOCF on the photocatalytic activity as compared to Bi2Mo06 has significantly improved.The results of photodegrading rhodamine B,eactive yellow,methylene blue and methyl orange showed that Bi2MoO6/AOCF has good photocatalytic degradation and the catalytic activity is better in acidic condition.Bi2MoO6/AOCF is easy to be recycled and reused,and after repeated 5 times for Rh B degradation was still up to 91.4%.The photocatalytic reaction accorded with first-order kinetics.