Al Momani Fares, Shawaqfah Mo'ayyad, Shawaqfeh Ahmad, Al-Shannag Mohammad
Chemical Engineering Department, Mutah University, Karak 61710, Jordan.
J Environ Sci (China). 2008;20(6):675-82. doi: 10.1016/s1001-0742(08)62112-9.
Fenton and ozone treatment was investigated at laboratory scale for the degradation of aqueous solutions of nitrobenzene (NB). Effects of reactants concentration (03, H2O2, and Fe(II)), temperature, and pH on NB degradation were monitored. Reaction kinetic of these processes was also assessed. A rapid reaction took place for Fenton process at higher initial concentration of H2O2, higher temperatures, and more acidic conditions (pH 3). Similarly, ozonation reaction exhibited rapid rates for higher ozone dose, higher temperatures, and more basic conditions (pH 11). Complete NB degradation in 65 min was achieved using Fenton process. The conditions of complete elimination of 100 mgfL of initial NB concentration, were 250 mg/L of H2O2 concentration, pH 3, and 10 mg/L of Fe(II) concentration. Under these conditions, 55% organic carbon elimination was achieved. Total organic carbon mineralization was attained in 240 min reaction time by Fenton process with 900 mg/L of H2O2 concentration, and 30 mg/L of Fe(II) concentration. Fenton reaction showed a pseudo-first order kinetic; the reaction rate constant was ranged from 0.0226 to 0.0658 min(-1). Complete NB degradation was also achieved for an ozone dose of the order of 2.5 g/L. The ozonation was studied at different ozone doses, different initial pH (7-11) and at different temperatures (15-35 degrees C). NB ozonation kinetic was represented by a bi-molecular kinetic model which was reduced to pseudo-first order kinetic. The pseudo-first order reaction rate constant was determined to increase at 20 degrees C from 0.004 to 0.020 min(-1) as the used ozone increased from 0.4 to 1.9 g/L.
在实验室规模下研究了芬顿和臭氧处理对硝基苯（NB）水溶液的降解效果。监测了反应物浓度（O₃、H₂O₂和Fe(II)）、温度和pH对NB降解的影响。还评估了这些过程的反应动力学。在较高的H₂O₂初始浓度、较高温度和更酸性条件（pH 3）下，芬顿过程发生快速反应。同样，在较高的臭氧剂量、较高温度和更碱性条件（pH 11）下，臭氧氧化反应速率较快。使用芬顿过程在65分钟内实现了NB的完全降解。完全消除初始浓度为100 mg/L的NB的条件是：H₂O₂浓度为250 mg/L、pH为3、Fe(II)浓度为10 mg/L。在这些条件下，实现了55%的有机碳消除。通过芬顿过程，在反应240分钟时，H₂O₂浓度为900 mg/L、Fe(II)浓度为30 mg/L时实现了总有机碳矿化。芬顿反应表现出准一级动力学；反应速率常数范围为0.0226至0.0658 min⁻¹。对于约2.5 g/L的臭氧剂量也实现了NB的完全降解。在不同的臭氧剂量、不同的初始pH（7 - 11）和不同温度（15 - 35℃）下研究了臭氧氧化。NB臭氧氧化动力学由双分子动力学模型表示，该模型简化为准一级动力学。随着使用的臭氧从0.4 g/L增加到1.9 g/L，在20℃下准一级反应速率常数从0.004增加到0.020 min⁻¹。
