Preparation Of Modified TiO₂ And Its Applications On The Treatment Of Oil-field Wastewater

Titania TiO2 and Transition metal-doped TiO2 was obtained through a hydrothermal process and characterized by X-ray powder diffractometry(XRD),N-absorptiometry,transmission electron microscope (TEM) , thermal analyses (TG-DTA) and UV-Vis DRS. The results showed that the rare elements might be highly dispersed in TiO2 internal lattice, Incorporation makes the crystalline phase corresponding to the width of the diffraction Peaks shape, The product has a good dispersion, the crystal structure of TiO2 electrode was small. The titania with Fe/TiO2 molar ratio of 3.0%, large special surface area. Doped ions had not been found in FT-IR of complex TiO2 materials and there were an amount of hydroxyl groups on surface of the samples, Decreasing shifts in the bandgap energy which helps to increase the photocatalytic activity of the catalysts. The structure of the nanocomposites and the relationship between the concentrations of Fe and their photocatalystic activity, between heat treatment temperatures and their photocatalystic activity were also studied.The best doping rate and heat treatment temperature were obtained.The reaction conditions of the titania TiO2 and Transition metal-doped TiO2 photocatalytic desulfurization of HPAM adopted oil-field wastewater as the model compound were studied. the best preparation conditions were determined. The optimal Hydrothermal reaction temperature and time and the heat treatment temperature were 140℃and 48hours and 350℃; The results showed that the optimal volume of doped Fe, Ni, Cu, Zn of TiO2 in the oxidation of oil-field wastewater as photocatalysis respectively was 3%, 5%, 3%, 2%.Under the reaction conditions in the laboratory, the photocatalytic activity influence factors of Mesoporous titania TiO2 and Transition metal-doped mesoporous TiO2 Degradate oil, HPAM and COD in oilfield wastewater were studied. The results showed that when the molar ratio of TiO2 to PFS was 0.1:1, the dosing quantity was 11g/L, pH range was3-4, the reaction time was 40min,the removal rates of the oil content,HPAM and COD in oilfield wastewater were 93.8%, 92.7% and 62.9% respectively, This shows that the modified TiO2 through a hydrothermal process performs high photocatalytic activity on degradation of water HPAM,oil and COD, they can achieved a good effect on treatment of ASP flooding oil-field wastewater in HPAM,oil and COD.In addition, This paper gives the combinations of TiO2 with PFS techniques for the treatment of oil-field wastewater. The degradation processes of oil-field wastewater were studied. The result indicated that the best effect was obtained when the ratio of PFS and TiO2 is 1:0.1; dosage to 0.8g/L; pH in the range of 7 to 9; the reaction time of 40 minutes. The removal efficiency of oil content and suspended solids were 94.1% and 96.4%, Under the best treatment process, Treated effluent to the oilfield oilfield wastewater re-injection standards.