Efficient Fenton oriented oxidation of petroleum hydrocarbons in soil by regulating hydrophilic functional groups in soil organic matter

In order to reduce the ineffective consumption of hydroxyl radicals by soil organic matter, Fenton oriented oxidation was conducted after three methods of regulating the hydrophilic functional. The oriented oxidation of total petroleum hydrocarbons in the inactivated group was up to 7507.29∼ 20,764.87 mg•L/(kg•mol) with KTPH/SOM = 1.29, 0.66, which was 1.5∼ 2.7 folds that in the non-inactivated. 2 group (7820.58, 4911.50 mg•L/(kg•mol)) (KTPH/SOM = 0.43, 0.33). The results showed that highest oriented oxidation was reached in the inactivated group. Besides, from 3DEEM and FIRT, the lowest oxidation of protein I and the lowest percentage of hydrophilic functional groups in the inactivated group was 2006.66 ∼2718.93 mg/kg and 58.17∼ 62.68%, respectively, which were significantly lower than that before regulation. Above results indicated that when the ineffective consumption of hydroxyl groups by protein I was reduced with the hydrophilicity of rect soil organic matter decreasing, the efficient oriented oxidation of petroleum hydrocarbons was realized. [Display omitted] •The oriented oxidation at 225 mmol/L H2O2 was higher than that at 450 mmol/L H2O2.•After regulation, the decrease of protein I oxidation was obvious, improving the oriented oxidation of petroleum hydrocarbon.•The hydrophilicity of soil organic matter was worst in the inactive group, reducing the oxidation of protein I by •OH.