REACTION KINETICS STUDY ON H2O2 AND Na2FeO4 REMOVING TOTAL PETROLEUM HYDROCARBON FROM SOIL
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摘要: 利用H2O2、Na2FeO4 2种氧化剂对土壤中TPH进行去除实验,根据反应条件和反应速率的关系建立反应动力学模型,并对反应过程中反应速率变化、半衰期、TPH去除率等因素进行讨论和对比,寻找其反应规律。结果表明:H2O2去除TPH过程符合一级反应动力学模型。Na2FeO4去除TPH过程符合二级反应动力学模型,H2O2浓度增大导致反应动力学常数增加,Na2FeO4浓度增大导致反应动力学常数减小。采用0.078,0.156,0.234 mol/L 3种浓度H2O2溶液与TPH的初始反应速率分别为0.61×10-3,1.38×10-3,2.09×10-3 mol/(L·min),浓度为0.070,0.140,0.210 mol/L的Na2FeO4溶液与TPH的初始反应速率分别为13.30×10-3,20.47×10-3,12.86×10-3 mol/(L·min)。2种氧化剂与TPH的反应速率大小为:Na2FeO4>H2O2。H2O2、NaFeO4与TPH反应半衰期分别为40.40~66.50,4.10~7.14 min。H2O2的半衰期约为Na2FeO4的10倍。2种氧化剂对土壤中TPH去除率均可达到60%以上,但利用率较低。总结了2种氧化剂在去除TPH过程中反应速率、半衰期和去除率的特点,最终筛选并优化反应条件,为黄土高原土壤修复提供参考。Abstract: Two oxidants, H2O2 and Na2FeO4, were used to remove TPH from soil. The reaction kinetic model was established according to the relationship between reaction conditions and reaction rate. The factors such as reaction rate change, half-life and TPH removal rate in the reaction process were discussed and compared, and their reaction laws were also found out. The results showed that the process of removing TPH by H2O2 conformed to the first-order reaction kinetic model. The process of removing TPH by Na2FeO4 conformed to the second-order reaction kinetic model. The increase of H2O2 concentration led to the increase of reaction kinetic constant, and the increase of Na2FeO4 concentration led to the decrease of reaction kinetic constant. The initial reaction rates of H2O2 solution with TPH at concentrations of 0.078, 0.156, 0.234 mol/L TPH were 0.61×10-3, 1.38×10-3, 2.09×10-3 mol/(L·min). The initial reaction rates of Na2FeO4 solution with TPH at three concentrations of 0.070, 0.140 and 0.210 mol/L were 13.30×10-3, 20.47×10-3, 12.86×10-3 mol/(L·min). The reaction rates of the two oxidants with TPH were in the order of Na2FeO4>H2O2. The half-life of H2O2 reacted with TPH was 40.40~66.50 min, and the half-life of Na2FeO4 reacted with TPH was 4.10~7.14 min. The half-life of H2O2 was about 10 times of that of Na2FeO4. The removal rate of TPH in the soil by the two oxidants could reach more than 60%, which would not cause residue in the soil, but the utilization rate was low. The characteristics of the reaction rate, half-life and removal rate of the two oxidants in the process of removing TPH were summarized. Finally, the paper screened and optimized the reaction conditions to provide a theoretical basis for soil remediation in the Loess Plateau.
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Key words:
- total petroleum hydrocarbons (TPH) /
- soil organic matter (SOM) /
- reaction rate /
- H2O2 /
- Na2FeO4
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