PMS activation over MoS2/Co0.75Mo3S3.75 for RhB pollutant oxidation removal in fuel cell system. Issue 3 (June 2022)

• Record Type: Journal Article
• Authors: Chen, Xingyan; Liu, Lifen
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 3(2022)
• Publication Date: 2022-06
• Subjects: MoS2 -- Co-doping -- PMS activation -- PFC; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.107449
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: In advanced oxidation processes (AOPs), organic pollutants are oxidized, but getting the most energy out of pollutant in reducing cost of AOPs is still a challenge. In this study, MoS2 / Co0.75 Mo3 S3.75 composite nano-catalyst with high density catalytic active sites was synthesized by homogeneous and dispersed doping of single Co atoms in MoS2 by one-step hydrothermal method. The prepared catalyst was coated on stainless steel with silica sol for electrode application under visible light and activation of PMS (peroxymonosulfate) in Photocatalytic fuel cell (PFC) system. The synergy system at pH 6.5, visible light irradiation and 0.06 mM [PMS], was able to rapidly degrade RhB (50 mg·L −1 ) within 10 min and reach 98% degradation within 21 min (kinetic rate constant 0.261 min −1 ). The role of visible light contributes to RhB degradation more than oxidation by just PMS in PFC (Photocatalytic Fuel Cell). The dispersed Co sites have a significant effect of activating PMS, improving catalytic activity and enhancing reaction under closed circuit. The system has good stability, is also applicable to significant removal of tetracycline(TC, 76.35%) and bisphenol A (BPA, 53.76%). In MoS2 / Co0.75 Mo3 S3.75 -vis/PMS/PFC, species such as OH, SO4 −, O2 −, h + and 1 O2 jointly promote the degradation of RhB. This work provides a perspective for further study of two-dimensional metallic sulfide doped with transition metal ions and application of such vis/PMS/PFC system in removing other toxic pollutants. Graphical Abstract: ga1 Highlights: The prepared MoS2 / Co0.75 Mo3 S3.75 composite catalyst has enhanced photocatalytic activity. The catalyst (0.3 g·L −1 )and peroxymonosulfate (PMS 0.06 mM) is enough to degrade pollutants quickly. The synergy of the visible light, PMS and photocatalytic fuel cell(PFC) improves the efficiency of AOPs. The main ROSs involved in degradation are OH, SO4 −, O2 −, h + and 1 O2 . The system can remove more than 98% of Rhodamin B within 21 min.