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Comparison of XRD of pyrite in different periods: (a) pyrite standard card (FeS2-PDF#89-3057); (b) the initial pyrite; (c) the pyrite after reaction. (Experimental conditions: [MB]0 = 100 mg/L, [pyrite] = 0.5 g/L, [PDS] = 2 mmol/L, initial pH = 5, 25 °C).
