Abstract
The development of efficient catalysts to activate peroxymonosulfate (PMS) for pollutant degradation has captured tremendous attentions. Herein, a series of high-performance MIL-68(Fe)/MoS2 (68M) composite catalysts with Fe-Mo bimetallic active sites were synthesized. Several characterization results confirmed the successful preparation of these composite materials. The PMS activation by MIL-68(Fe)/MoS2 was systematically evaluated by degrading Rhodamine B (RhB). It was shown that the RhB removal rate could reach up to 99% within 15 min with catalyst and PMS dosage of 0.2 g/L and 0.4 mM, respectively. It could be attributed to the synergistic effects of Fe-site, Mo-site and S-vacancy. The RhB removal rate could achieve 91%− 99% under a broad PH range (2−10) in 68M-10/PMS system. The RhB removal efficiency still maintained higher-level (92.2%) after being used for five cycles, suggesting the outstanding reusability of 68M-10. The PMS activation mechanism was explored by XPS, EPR and the RhB degradation pathway was also proposed based on HR-MS results. Above results highlighted the bright application prospect of the synthesized catalysts in solving the increasing dye crisis.
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