Efficient Degradation 4-Nitrophenol by Photocatalysis from Modified TiO2 Doped Copper

In the present study,a film consisting of TiO2doped with copper was prepared for efficiently decomposing 4-nitrophenol(4-NP) by photocatalysis.The preparing process of TiO2doped with copper includes two procedures:preparing Ti(OH)4doped with copper and synthesizing anatase and rutile TiO2doped with copper.Ti(OH)4doped with copper could be achieved by hydrolyzing TiCl4in the mixed solution containing deionized water and copper oxalate.The Ti(OH)4doped with copper can be gained successfully by the following procedures:rinsing,drying and vacuum drying.The Ti(OH)4doped with copper could be converted into anatase TiO2doped with copper and rutile TiO2doped with copper by incineration for 4.5 h at 723 and 1 073 K,respectively.Characterizations of anatase TiO2doped with copper and rutile TiO2doped with copper were determined by X-ray diffraction(XRD) and energy dispersion of X-ray(EDX).Anatase and rutile TiO2doped with copper were dissolved in a mixed solution containing isopropanol and diethylamine.Stainless electrode was submerged into with the solutions,the film of TiO2was formed by drying the thin layer at a ramp rate of 3℃/min until 373 K,and this temperature was held for 1 h.The temperature of the oven was subsequently increased to a final temperature of 823 K at a ramp rate of 3℃/min,and was held at this value for 1 h.The stainless steel covered with modified TiO2film was utilized as the anode.The stainless steel mesh was used as the cathode.The cathode and anode were connected with the source and immersed into the solution with 100 mg/L 4-NP.The whole reaction on photocatalysis was perfectly carried out after ultraviolet radiation and aerator were run.The experimental results showed that:cracking ratio of 4-NP ring,the removal ratio of chemical oxygen demand(COD) and total organic carbon(TOC) were respectively more than 90%,80% and 80% within 2 h.Degradation of 4-NP implied its potential application in associated wastewater.