Photocatalytic Degradation Of Multi-nitrophenolics-DNBP

With the rapid development of synthetic chemical processes, a variety of refractory organics swarm into the Earth’s environment we live, in which the nitro phenolic compounds are toxic and recalcitrant organics, easy to be bioaccumulated but not easy be biochemical degradated in our environment and physical health and the environment which caused great harmness. The subjects of nanometer TiO2powder as a photocatalyst-DNBP nitro phenolic compounds in natural light simple process of photocatalytic degradation.The photocatalytic properties of TiO2semiconductor band gap of photo-generated electron-hole recombination constraints due to its structure, the light use efficiency is low and the hole composite its photocatalytic performance. Departure from the degradation mechanism of TiO2change the band gap of TiO2to improve energy efficiency, to improve the quantum efficiency explores Mixed TiO2photocatalytic degradation rate DNBP inhibition of photo-generated electron and hole recombination. Experiments sol-gel prepared TiO2catalyst, in the sunlight of low concentration DNBP photocatalytic reaction.Firstly,when TiO2mixed with metal elements, metal atoms get into the lattice internal semiconductor grain defects, photo-generated electron-hole recombination is suppressed to improve the degradation rate of the photocatalytic DNBP zinc doped TiO2powder on DNBP highest degradation rate,65.8%; followed by non-metallic can change the width of the band gap of the semiconductor TiO2, TiO2doped optical absorption band edge redshift of visible light use efficiency, and also improve the photocatalytic degradation rate DNBP the degradation rate of the activated carbon-doped nanometer TiO2powder DNBP the highest at73.2%; third, co-doping of metal-non-metallic played a synergistic effect to some extent, more effective inhibition of the photo-generated electron-hole composite, and increase the utilization rate of absorption of visible light to further enhance the degradation rate of Photocatalytic DNBP. The orthogonal design come to different metal-nonmetal codoped the best modified nano-TiO2powder DNBP photocatalytic degradation rate of88.4%, relative to the doped TiO2Nanoparticles photocatalytic DNBP degradation rate has been significantly improved.This issue had solved photocatalytic degradation of the low concentration of DNBP successfully and effectively in natural light.