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Fig. S1. FT-IR spectra of five types of humics or quinones (HA, FA, AQDS, AQS, AQC).

Fig. S2. Proposed mechanism of humics-mediated reduction of α-FeOOH and 2,4-D in the system of α-FeOOH/2,4-D+MFC-5+Humics+sucrose under alkaline conditions.

Fig. S3. UV-Vis absorption spectra for 0.5 mmol l−1 quinones (AQDS, AQS and AQC) or 0.5 mM hydroquinones (AH2QDS, AH2QS, and AH2QC) at pH 9.0. Specific wavelengths of AH2QDS, AH2QS, and AH2QC at pH 9.0 were 408 nm, 397 nm and 380 nm respectively.

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