Oxidation of nine petroleum hydrocarbon compounds by combined hydrogen peroxide/sodium persulfate catalyzed by siderite
2020
Li, YueHua | Zhao, Lin | Chen, Fulong | Jin, Kylan S. | Fallgren, Paul H. | Ma, Yukun
A system consisting of hydrogen peroxide/persulfate (H₂O₂/S₂O₈²⁻) catalyzed by siderite was attempted to oxidize nine representative petroleum hydrocarbon compounds [benzene, toluene, ethylbenzene, m-xylene, p-xylene, o-xylene, 1,2,4-trimethylbenzene, methyl-tert-butyl ether, and naphthalene] that tend to persist in the environment. Oxidation under different siderite dosages, H₂O₂:S₂O₈²⁻ ratios, and pH conditions were investigated. Results indicated that oxidation rates increased from 1.21–4.62 to 1.77–8.94 d⁻¹ as siderite increased from 0.16 to 0.48 g/40 mL (H₂O₂:Na₂S₂O₈ = 5:1, initial pH = 3.0), except for naphthalene (decreased from 0.58 to 0.45 d⁻¹ with increased siderite dosage). When the H₂O₂:S₂O₈²⁻ ratio was increased from 1:1 to 5:1 (siderite = 0.16 g, initial pH = 3.0), the oxidation rates increased from 0.02–0.73 to 0.33–2.19 d⁻¹. However, as pH increased to > 5.5 (siderite = 0.16 g, H₂O₂:Na₂S₂O₈ = 2.5:1), the oxidation rates of petroleum hydrocarbons decreased to 0.003–0.09 d⁻¹, which was approximately 90% less than that at pH = 3.0. The partial correlations and principal component analysis of the experimental data were conducted. Overall, both siderite dosage and H₂O₂:S₂O₈²⁻ ratio correlated positively with oxidation efficiency. The oxidation potential by H₂O₂/S₂O₈²⁻ mixtures towards the target petroleum hydrocarbon compounds seemed to be more sensitive to pH conditions than to siderite dosages or H₂O₂:S₂O₈²⁻ ratios.
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