Synergistic activation of peroxymonosulfate and persulfate by ferrous ion and molybdenum disulfide for pollutant degradation: Theoretical and experimental studies

Activation of peroxymonosulfate (PMS) and persulfate (PS) by Fe is widely used for oxidizing organic pollutants. However, their application is limited by the slow conversion rate of Fe to Fe and the accumulation of Fe. Here, we introduce commercial molybdenum disulfide (MoS) to promote the activation of PMS and PS by Fe, and explore the mechanism of this promotion using experimental and theoretical methods. The Fe/PMS/MoS and Fe/PS/MoS systems achieved faster rate of PMS and PS conversion and also higher degradation efficiency toward pollutants. About 94.7% and 87.6% of rhodamine B (RhB) could be degraded in Fe/PMS/MoS (54 μM Fe, 1 mM PMS) and Fe/PS/MoS (54 μM Fe, 0.25 mM PS) system, respectively. MoS addition simultaneously promoted the Fe/Fe cycle, the PMS and PS conversion, and the RhB mineralization. As a co-catalyst, MoS exhibited excellent stability for eight successive cycles of use. The predominant oxidant was identified as SO[rad] in Fe/PMS/MoS and Fe/PS/MoS systems. Theoretical calculations and a kinetic model were employed to evaluate the catalytic performance of the systems. These novel findings indicate that the combination of a commercially available MoS catalyst with a low dosage of Fe is a promising and effective approach for efficient activation of PMS and PS to produce SO[rad] and [rad]OH.

Bibliographic Details

Main Authors:	He, D., Cheng, Y., Zeng, Y., Luo, H., Luo, K., Li, J., Pan, X., Barceló, Damià, Crittenden, J.C.
Format:	artículo biblioteca
Published:	Elsevier 2020
Online Access:	http://hdl.handle.net/10261/232289
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