Photocatalytic Degradation Of Organic Wastewater By Reed Rod Carbon Loaded N-Doped Titanium Dioxide

Organic wastewater can not only affect people's health,but also break the water ecosystem circular.Traditional wastewater treatment methods need harsh treatment conditions and high energy consumption.The new semiconductor photocatalytic method solves this problem.Therefore,a new environmentally friendly catalyst,N-TiO2 supported on reed straw has been prepared.Based on current research progress and status,this paper will study from the following aspects:First,TiO2 was prepared by a sol-gel method and a solvothermal method under different experimental conditions.XRD and SEM results showed that the annealed samples exhibit anatase crystal form.And the sample prepared by the sol-gel method under ethanol condition had high purity,excellent particle dispersion and uniform spherical morphology.The particle size distribution results showed that the particle size of TiO2 prepared by the sol-gel method under ethanol condition was the smallest,about 1 ?m.Degradation experiments of methylene blue(C16H18ClN3S)showed that the degradation rates of TiO2 prepared by three experimental methods were 70%,42%and 53%,respectively.The photocatalytic performance of TiO2 prepared by sol-gel method under ethanol condition was the best.Moreover,with the particle size decreased,the photocatalytic performance of TiO2 increased.Secondly,N-doped TiO2 and Fe-doped TiO2 with different doping ratios were prepared using N(CO(NH2)2)as N source and ferric nitrate(Fe(NO)3)as Fe source.Annealing was carried out at 350?,450? and 550?,respectively.It was found by XRD that the crystal structure of TiO2 was anatase when annealed at 350? and 450?.The crystal structure of Fe-doped TiO2 was anatase at 5 50?,while N reduced the phase transition temperature and converted some of the anatase to the rutile phase.Particle size distribution result showed that the doping of N and Fe can reduce the diameter of TiO2 particles,which about 600 nm.The methylene blue degradation experiment showed that the 1%at N-doped TiO2 had the highest photocatalytic degradation rate of 80%after annealing at 350?.Finally,N-doped TiO2 supported on a reed straw was prepared.The experimental results showed that the degradation rate of sample for methylene blue,phenol,nitrobenzene and p-chlorophenol were all over 85%.