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- W3122558082 abstract "Siderite is a conventional mineral of sedimentary rock and can activate H2O2 to produce hydroxyl radicals (·OH). Bisphenol A (BPA), 2,4-dichlorophenoxyacetic acid (2,4-D), and sodium sulfadiazine are selected as typical micropollutants to be degraded in a siderite-activated H2O2 system. To determine the influence of solution chemistry on siderite-activated Fenton-like reactions, the amount of ·OH was quantified by using benzoic acid as a probe molecule, and then, kinetic fitting was used to analyze the reaction rate. The results showed that in the range of pH values from 3 to 9, the dissolved Fe2+ and the lattice Fe(Ⅱ) of siderite activate H2O2 to generate ·OH. An increase in siderite dosage and H2O2 concentration favored the generation of ·OH, but higher siderite dosage and H2O2 concentration suppressed the production rate. The inhibition order of anions on the generation of ·OH was confirmed as follows Cl− > NO3− > SO42−. Little difference was observed in the presence of Ca2+ and Mg2+, while the presence of Mn2+ significantly promoted the production of ·OH. The suppression of humic acid (HA) became more serious as the HA concentration increased. Cycling experiments proved that the system could still produce ·OH in four cycles, although the production rate experienced a slight decrease. The experimental results suggested the role of siderite in the degradation of organic pollution in the process of in-situ soil and groundwater remediation." @default.
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- W3122558082 date "2021-03-01" @default.
- W3122558082 modified "2023-09-28" @default.
- W3122558082 title "A quantitative analysis of hydroxyl radical generation as H2O2 encounters siderite: Kinetics and effect of parameters" @default.
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- W3122558082 doi "https://doi.org/10.1016/j.apgeochem.2021.104893" @default.
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