Mechanism and performance evaluation of FeSe2 and MoS2-loaded carbon fiber sheet as a novel heterogeneous Fenton-like catalyst

• Published in: Applied surface science 2022-10, Vol.598, p.153860, Article 153860
• Main Authors: Zhang, Xu, Zhang, Wei, Ran, Lang, Wang, Xiangyu, Zou, Binze, Zhou, Lincheng
• Format: Article
• Language: English
• Subjects: Carbon fiber sheet; FeSe2; Heterogeneous Fenton; Methylene blue; MoS2
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2022.153860

[Display omitted] •FeSe2 and MoS2 are combined to activate H2O2 in Fenton reaction is reported for the first time.•The adsorption capacity of MoS2 in the MoS2@FeSe2@CFS can confine the pollutant to the catalyst, thus shortening the mass transfer distance.•There are excellent catalytic activity and stability of catalyst in H2O2/ MoS2@FeSe2@CFS systems for MB wastewater.•The S22- species in MoS2 participates in Fe3+/Fe2+ cycle, and enhances the synergy between FeSe2 and MoS2. A novel non-woven carbon fiber sheet-supported FeSe2 and MoS2-loaded Fenton catalyst (MoS2@FeSe2@CFS) was synthesized by a two-step hydrothermalprocess. The MoS2@FeSe2@CFS exhibited an excellent performance on hydrogenperoxide (H2O2) activation at different conditions. Removal efficiency of methyleneblue (MB) reached 99.7% within 20 min and the rate constant was higher than those of the most reported iron-containing catalyst/H2O2 systems for MB degradation. The possible activation mechanism of H2O2 by MoS2@FeSe2@CFS in heterogeneous system was proposed·H2O2 was activated to ·OH by Fe2+, and generated Fe3+ was reduced to Fe2+ by Mo4+. Besides, MoS2 has great adsorption performance and can aggregate MB near the catalyst, shortening the mass transfer distance. Therefore, the heterogeneous Fenton catalyst MoS2@FeSe2@CFS has excellent catalytic property. Notably, it was discovered that S might participate in the Fe3+/Fe2+ cycle, which has not been reported in literature. Moreover, MoS2@FeSe2@CFS have good long-term stability and repeatability because of its highstrength and chemicaldurability. Overall, this work expands the environmental application of iron-containing catalyst and provides a promising heterogeneous Fenton system for removal of contaminants from water.