热活化过硫酸盐氧化修复柴油污染土壤

Thermo activated persulfate oxidation for remediation of diesel oil contaminated soil

采用热活化过硫酸盐法,考察了过硫酸盐浓度、温度、水土比和初始pH对柴油污染土壤氧化修复的影响,并分析了其动力学和热力学参数。结果表明,当Na2S2O8摩尔浓度为0.8mmol/g、温度为70℃、水土比为2.0mL/g、初始pH为11.00时,反应72h后的柴油降解率最高,达到77.85%。动力学和热力学分析表明,热活化过硫酸盐氧化降解柴油过程为自发、吸热、熵增的过程,表观活化能为-80.73kJ/mol。

Thermo activated persulfate oxidation was selected to repair diesel oil contaminated soil The effects of concentration of persulfate, temperature, water-soil ratio, and initial pH on the degradation efficiency of diesel oil were investigated,and kinetic and thermodynamic parameters were analyzed. Results showed that the degradation efficiency of diesel oil reached peak （77.85%） when Na2S2O5 molar concentration was 0,8mmol/g, temperature was 70℃ ,water-soil ratio was 2.0 mL/g,and initial pH was 11.00 after 72 h. According to the kinetic and thermodynamic analysis,it was showed that the remediation process could occur spontaneously. The oxidation process was a endothermic and entropy-increasing reaction with an apparent activation energy of -80.73 kJ/mol.