A Comprehensive Assessment of Catalytic Performances of Mn2O3 Nanoparticles for Peroxymonosulfate Activation during Bisphenol A Degradation

Abstract

Catalytic performances of Mn2O3 nanoparticles for peroxymonosulfate (PMS) activation in bisphenol A (BPA) degradation were comprehensively investigated in this study. Experimental results showed that 10 mg/L BPA could be 100% degraded within 20 min with the dosages of 0.2 g/L Mn2O3 and 0.1 mM PMS. Moreover, Mn2O3 showed remarkable activity in activation of PMS and excellent adaptability in various real water matrices, including river water, tap water and secondary effluents. Based on the radical detection and scavenging experiments, it was found that both radical and non-radical oxidation contributed to the degradation of BPA and 1O2 was the dominant species in the degradation compared to •OH, SO4•− and O2•−. A total of 15 transformation products were identified by LC/MS-MS during BPA degradation in the Mn2O3/PMS system, and degradation pathways via three routes are proposed. Compared with lab-made catalysts reported in the literature, the Mn2O3 catalyst demonstrated its superiority in terms of its high TOC removal, low PMS consumption and fast degradation rate for BPA.

Fabrication of a Co3O4 monolithic membrane catalyst as an efficient PMS activator for the removal of methylene blue

“…29,38,39 Remarkably, 1 O 2 could also be formed through the reaction of HSO 5 − and O* converted from O L , as eqn (24) and (25) described. 36 Finally, MB molecules were attacked and degraded by these reactive radicals (SO 4 ˙ − , ˙OH and ˙O 2 − ) and non-radicals ( 1 O 2 ). The proposed degradation mechanism for MB in the integral NF-based Co 3 O 4 /PMS system is illustrated in Fig.…”

“…29,38,39 Remarkably, 1 O 2 could also be formed through the reaction of HSO 5 À and O* converted from O L , as eqn ( 24) and ( 25) described. 36 Finally, MB molecules were attacked and degraded by these reactive radicals (SO 4 À , OH These findings suggested that the integral NF-based Co 3 O 4 was a promising candidate catalyst for activating PMS to remove organic contaminants owing to its excellent catalytic efficiency, high stability and easy recovery feature.…”

“…35 After that, a proportion of the generated SO 4 À reacted with H 2 O or OH À to form OH, which could further react with HSO 5 À to produce O 2 À (eqn ( 15)-( 17). 36 Besides, O 2 À could also be generated through the reaction of dissolved oxygen and electron transferred from the catalyst surface (eqn ( 18) and ( 19)). 2,37 Meanwhile, the non-radical active species of 1 O 2 were also synchronously produced either by the self-decomposition of PMS or reactions involving OH and O 2 À (Eqn (20-23).…”

Peroxymonosulfate activation using CoFe2O4/Fe2O3 nanocomposite for Acid Orange removal

“…Cobalt (Co)-based catalysts have been reported as the most efficient catalyst in PMS activation to generate SO 4 •− [10]. To date, a numerous of Co containing materials as heterogeneous catalyst have been studied as PMS activators.…”