MoS2 boosts the Fe2+/PMS process for carbamazepine degradation
2022
Peng, Huan | Chen, Rong | Tao, Ningyao | Xiao, Yangyi | Li, Chenxing | Zhang, Tuqiao | Ye, Miaomiao
Activation of peroxymonosulfate (PMS) by Fe²⁺ is a green oxidation process for degradation of organic contaminants. However, the formation of iron mud and low PMS utilization lead to the decreased oxidation efficiency. In this work, commercial MoS₂ particles were used as the catalyst for boosting the Fe²⁺/PMS process for carbamazepine (CBZ) removal. The CBZ removal efficiency by the MoS₂/Fe²⁺/PMS process was significantly enhanced, increasing to 6.5 times that of the Fe²⁺/PMS process. The Fe³⁺ was reduced to Fe²⁺ by the exposed Mo⁴⁺ on the surface of MoS₂, leading to the enhanced PMS utilization rate and increased Fe²⁺ concentration. The relative intensity of DMPO-HO• and DMPO- SO₄–• followed the order of MoS₂/PMS < Fe²⁺/PMS < MoS₂/Fe²⁺/PMS, also suggesting the enhanced oxidation activity with the addition of MoS₂ in the process of Fe²⁺/PMS. The commercial MoS₂ had good stability shown by the CBZ removal efficiency remaining almost unchanged during 8-time cycling use. Finally, a possible CBZ degradation pathway was proposed for helping understand the oxidation mechanism of the MoS₂/Fe²⁺/PMS process.
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