Add time:08/24/2019         Source:sciencedirect.com

In this paper, H2[email protected] composites were fabricated by the simple hydrothermal method through in-situ growth iron-based metal-organic frameworks (H2N-Fe-MIL-88B) on ordered mesoporous carbon (OMC). Compared with pure H2N-Fe-MIL-88B crystals, the introduction of OMC can shrink the size of H2N-Fe-MIL-88B, increase the specific surface area, decrease the electron transfer resistance and drastically improve the electrochemical performance of H2[email protected] The composite exhibits remarkable electrocatalytic activity for p-nitrotoluene (p-NT) reduction and hydrazine (N2H4) oxidation. Therefore, a novel electrochemical sensor based on H2[email protected] was constructed for the efficient detection of these two environmental pollutants, respectively. Under the optimal experimental conditions, the proposed sensor displays a wide linearity range for p-NT that is composed by two line segments (20–225 μM and 225–2600 μM) and the limit of detection (LOD) is 8 μM (S/N = 3). Meanwhile, the sensor also shows a linear response to N2H4 in the range of 0.006–0.061 μM and 0.061–611.111 μM with a high sensitivity of 20.1 μA/μM·cm2 in low concentration range as well as a very low LOD as 5.3 nM (S/N = 3). And the response time of the sensor for N2H4 detection is about 1 s. In addition, the proposed sensor shows satisfactory electrochemical stability, reproducibility, selectivity and practicability. H2[email protected] may be a splendid candidate for developing electrochemical sensors to detect environmental pollutants.

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