【摘要】 把反应速率常数和量子产率作为动力学常数,研究了石油烃类化合物的TiO2光催化氧化降解.并采用高光密度法,以K3Fe(C2O4)3做光露计,300 W中压汞灯为光源,在365 nm波长处测定石油烃类的反应速率常数和量子产率.结果表明:正十六烷、正癸烯和萘等石油烃类在365 nm波长下的TiO2光催化氧化降解反应均服从一级反应动力学,其反应速率常数分别为4.3×10-3、6.7×10-3和5.1×10-3m in-1.K3Fe(C2O4)3光解服从零级反应,其速率常数为5×10-5(mol/L)-1.m in-1;正十六烷、正癸烯和萘的量子产率分别为1.20、1.87和1.42,其值均大于1,进而表明了TiO2光催化氧化法对石油烃类化合物的降解反应可能有活性氧参与.更多还原

【Abstract】 The reaction kinetics constants and quantum yields of petroleum hydrocarbons by TiO₂ photocatalytic oxidation were studied.Under 300 W medium mercury lamp,the quantum yields of petroleum hydrocarbons at 365 nm were determined by potassium ferri-oxalate actinometer.And their reaction kinetics constants were measured too.The reasults showed that the TiO₂ phtodegradation reaction of n-hexadecane,n-decene and naphthalene at 365 nm wavelength was the first-order.The reaction rate constants were 4.3×10^-3,6.7×10^-3 and 5.1×10^-3 min^-1 respectively;The photodegradation of（K₃Fe（C₂O₄）₃） was zero order reaction.And the reaction rate constants was 5×10^-5(（mol/L）^-1·min^-1);The photodagradation quantum yields of n-hexadecane,n-decene and naphthalene were 1.20,1.87 and 1.42 respectively under 300 W medium mercury lamp.Their values were greater than 1,which revealed that TiO₂ photocatalytic oxidation mechanism may be reactive oxygen species.更多还原