纳米二氧化钛光催化氧化油田采出水中萘和芴的影响因素分析

利用纳米二氧化钛光催化氧化技术,分析了不同影响因素UV波长(UVA 365 nm、UVB 308 nm和UVC 254 nm)、温度、pH、催化剂(TiO2)、抑制剂(BuOH)和氧化剂(O2、H2O2和O3)对油田采出水中多环芳烃萘和芴降解效率的影响,并进一步优化出单因子的最佳条件。实验结果表明,各因素对萘和芴降解有不同的影响,但其效果都随波长减小和酸度降低而得到增强。当其他条件为一致最优时(T=90℃, TiO2=0.5 g/L和BuOH=0.03 mol),当H2O2=0.01 mol 或O2=30 mL/min时,萘的降解率最高,而当H2O2=0.1 mol或O3=30 mL/min对芴的降解效果最好。

Factor analysis for nanometer titanium dioxide phtocatalytic oxidation of naphthalene and fluorine in produced water

This study applied the nano titamium dioxide photocatalytic oxidation technology to remove two typical polycyclic aromatic hydrocarbons(PAHs), naphthalene and fluorine, from oilfield produced water. Laboratory tests were conducted to examine the effects on removal effectiveness of multiple factors including UV wavelength (UVA 365 nm, UVB 308 nm, UVC 245 nm), temperature, pH, catalyst(nano-TiO2),inhibitors(BuOH), oxidants(O2,H2O2 and O3), The optimal conditions for each single factor were identified. The experimental results showed that the degradation rates of the two compounds varied with factors,and indicated some common observations. For example, the degradation was pormoted with the decrease of UV wavelength and the reduction of acidity. Under the optimal conditions(T=90℃, TiO2=0.5 g/L, and BuOH=0.03 mol), the highest degradation rate for naphthalene could be achieved when H2O2=0.01 mol or O2=30 mL/min, but for fluorine such conditions changed to H2O2=0.1 mol or O3=30 mL/min.