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The present study focused on the oxidative fixation of As(Ⅲ) by Fe(Ⅱ)-containing minerals in coordination with low molecular weight organic acids (LMWOA) (such as oxalic acid (OA), citric acid (CA), gallic acid (GA)) to generate reactive oxygen species (ROS). Siderite (FeCO3) was utilized as the test mineral to investigate the capacity of FeCO3-LMWOA complexes in adsorbed and co-precipitated states for As(Ⅲ) oxidation, and to analyze the generation of hydroxyl radicals (·OH) and the morphological changes of Fe during the oxidation process, as well as the effects of radical quenchers and C/Fe molar ratio on As(Ⅲ) oxidation and As(T) immobilization. The results demonstrated that adding 0.05~0.5mmol/L LMWOA enhanced the oxidation of As(Ⅲ) by siderite, with the order of GA>CA>OA, and the removal rate of As(Ⅲ) in the presence of GA was up to 80%. For the adsorbed and co-precipitated complexes, the oxidative capacity was enhanced by increasing C/Fe, and the co-precipitated FeCO3-CA complex exhibited the highest removal efficiency of As(Ⅲ), reaching 92.1%. The free radical quencher methanol and NBT exhibited obvious inhibition on As(Ⅲ) oxidation, which proved that the main active substances for oxidizing As(Ⅲ) were and ·OH. The ability of different LMWOA to compete with As(Ⅲ) for ·OH was different, among which the co-precipitated FeCO3-GA complex had the highest OC mineralization rate of 72.2%, and the main reason for the OC loss was the oxidation by ·OH. SEM and XRD analyses showed that siderite was transformed to hematite after reaction. This study not only reveals the synergistic mechanism between Fe(II)-containing minerals and LMWOA in As(Ⅲ) oxidation, but also provides new perspectives and strategies for the environmental management of arsenic pollution.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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