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Caption : edx pattern of (a) fe3mn1-mof, (b) fe2mn1-mof, (c) fe1mn1-mof, (f) fe1mn2-mof.

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Caption : fig. s2 uv–vis absorption spectra of tmb catalyzed by different composite in system (a) tmb + h2o2 + fexmny-mof; (b) tmb +fexmny-mof.

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Caption : fig. s3 (a) uv-vis absorption spectra and color changes of tmb in different reaction systems: (1) fe1mn1-mof, (2) tmb, (3) tmb + fe1mn1-mof; (b) the oxidation of various substrates catalyzed by fe1mn1-mof. (c) the uv-vis spectra of tmb catalyzed by different concentrations of fe1mn1-mof; (d) uv-vis spectra of different concentrations of fe1mn1-mof after adding sulfuric acid. the effects of (e) ph and (f) temperature on the mimic enzyme activity.

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Caption : fig. s4 absorbance at 652 nm of the tmbox system as a function of time in two solutions (black line: fe1mn1-mof, red line: leaching solution).

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Caption : fig. s5 steady-state kinetic analyses using the michaelis–menten curves (a, b and c) and the lineweaver–burk plots (d, e and f) for fe1mn1-mof. (a and d) the tmb concentration was altered, (b and e) the h2o2 concentration was altered, and (c and f) the concentration of tmb was altered without h2o2.

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Caption : fig. s6 esr spectra of fe1mn1-mof+h2o2 in (a) h2o for dmpo-•oh, (c) h2o for dmpo-•o2−, and (e) h2o for temp-1o2. esr spectra of fe1mn1-mof composite without h2o2 for dmpo-•oh, dmpo-•o2−, and temp-1o2 are shown in b, d, and f, respectively.

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Caption : fig. s8 configurations of adsorption of h2o2 on different models: (a) mn-mof; (b) fe-mof; (c) fe1-mn1-mof (mn*); (d) fe1-mn1-mof (fe*).

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Caption : fig. s9 configurations of adsorption of o2 on different models: (a) mn-mof; (b) fe-mof; (c) fe1-mn1-mof (mn*); (d) fe1-mn1-mof (fe*).

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Caption : fig. s10 the influences of buffer solution ph (a); concentration of tmb (b); concentration of fe1-mn1-mof (c);concentration of 8-hq (d); temperature (e); responsive time (f) on the system (fe1-mn1-mof: 60 μg/ml, tmb: 0.5 mm, 8-hq: 0.45 mm, cr (ⅵ): 3000 nm).

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Caption : fig. s7 uv-vis spectra of different reactive oxygen species scavengers added to the system.

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Caption : fig. s11 (a) variation of catalytic activity of the fe1mn1-mofs with time through 30 days; (b) the absorbance difference (δa) at 652 nm of five sample solutions with the same cr(ⅵ) concentration.

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Caption : fig. s12 anti-interference experiment for colorimetric detection of cr (vi). (a) cation, (b) anion.

