Study on photocatalytic CO2 reduction of Ag/h-BNNS/PVP composite fiber membranes performance

Abstract

In order to improve the photocatalytic performance of nano-noble metal materials, porous boron nitride nanosheets (h-BNNS) with high specific surface area were prepared by high temperature pyrolysis of the precursor using melamine and boric acid as raw materials. After vacuum impregnation of AgNO3, the nanosheets were added to polyvinylpyrrolidone (PVP) spinning solution. Ag/h-BNNS/PVP composite fiber film was prepared by electrospinning, and the composition, microstructure and photoelectrothermal properties of the composite fiber film were characterized. The Ag plasmon resonance effect significantly improves the visible light absorption and electron-hole pair separation efficiency of the composite fiber membrane. The results showed that silver nanoparticles (Ag NPs) were uniformly dispersed on the surface of the composite fibers, and the average particle size was less than 10 nm. In addition, the introduction of Ag NPs also improves the thermal stability of the membrane material. Based on the CO2 reduction model, the photocatalytic performance of the composite fiber membrane was investigated and tested. The results showed that the best photocatalytic activity of the composite fiber membrane was achieved when the calcination temperature was 250 ℃ and the Ag NPs content was 1.0% (CO yield was 300 μmol/(g·h)).The stability test showed that the CO yield of Ag/h-BNNS/PVP composite membrane was not less than 500 μmol/g after 10 cycles of use. Therefore, the efficient porous composite membrane catalyst prepared by doping Ag NPs to modify h-BNNS and loading Ag/h-BNNS composite particles in PVP fiber provides theoretical reference for future research on boron nitride based catalysts.

Keywords

• polymer composites; boron nitride; ag nanoparticles; photocatalytic performance; mechanism