Orange G degradation by heterogeneous peroxymonosulfate activation based on magnetic MnFe2O4/α-MnO2 hybrid

Decomposition and mineralization of glyphosate herbicide in water by radical and non-radical pathways through peroxymonosulfate activation using Co3O4/g-C3N4: a comprehensive study

“…The high decomposition efficiency of organic pollutants at pH 11 was also observed for Co/g-C 3 N 4 /PMS, 16 CuCoFe-LDH/PMS, 11 Co/Bi 25 FeO 40 /PMS, 71 and MnFe 2 O 4 /α-MnO 2 /PMS. 78 However, when the pH increased from 11 to 12, the efficiency decreased sharply from 94.28 to 30.46%. At pH ≥ 12, there is a loss of the HSO 5 − form for PMS; thus, it is not effective for the formation of 1 O 2 .…”

“…As the temperature increases, the Gly decomposition efficiency increases, which may be due to the thermal decomposition of the O–O bond in HSO 5 − to yield more ROS. 77,78…”

“…The formation of O 2 ˙ − is from the decomposition of HO 2 ˙ (reactions (17) and (18)). 11,78 These 1 O 2 , O 2 ˙, SO 4 ˙ − , and HO˙ radicals will then oxidize Gly on the catalyst surface to intermediates and mineralize them into inorganic ions (reactions (35) and (36)). Co( ii ) + HSO 5 − → Co( iii ) + SO 4 ˙ − + OH − Co( iii ) + HSO 5 − → Co( ii ) + SO 5 ˙ − + H + g-C 3 N 4 + HSO 5 − → g-C 3 N 4 − + SO 5 ˙ − + H + 2SO 5 ˙ − + 2OH − → 2SO 4 2− + 2HO˙ + O 2 HSO 5 − → SO 5 2− + H + H 2 O 2 → H + + HO 2 − H 2 O 2 + HO − → H 2 O + HO 2 − HSO 5 − + HO 2 − → H 2 O + SO 4 ˙ − + 1 O 2 4SO 4 ˙ − + 2H 2 O → 4HSO 4 − + 1 O 2 HO˙ + O 2 ˙ − → 1 O 2 + HO − [ 1 O 2 , O 2 ˙, SO 4 ˙ − , HO˙] + Gly → intermediates + SO 4 2− [ 1 O 2 , O 2 ˙, SO 4 ˙ − , HO˙] + intermediates → H 2 O + CO 2 + NH 4 + + NO 3 − + PO 4 3− The MS spectra of the samples collected at a certain time during Gly decomposition are shown in Fig.…”

Facet-Dependent Catalytic Activity of MnFe Prussian Blue Analogues in Peroxymonosulfate-Activated System for Efficient Degradation of Acetamiprid

“…The principle of high-performance catalyst design is to precisely customize the active site for the desired catalytic reaction with optimal geometric and electronic properties. , Notably, the crystal facets that make up the semiconductor surface have different atomic configurations, which largely determine the exposed active sites and electronic structure, thereby endowing them with distinctive surface properties and catalytic activity. − As published, compared to other MnO 2 crystal forms, α-MnO 2 stands out as the most efficient PMS activator to degrade organic pollutants such as phenol, p -chloroaniline, and carbamazepine . Subsequently, more α-MnO 2 -based catalysts such as α-MnO 2 /palygorskite, MnFe 2 O 4 /α-MnO 2 , and α-MnO 2 /graphite were manufactured, and they displayed excellent catalytic performance for PMS activation. Therefore, the determination of the dominant crystal plane of the basic material can provide a meaningful research basis for subsequent studies.…”

“…11−13 As published, compared to other MnO 2 crystal forms, α-MnO 2 stands out as the most efficient PMS activator to degrade organic pollutants such as phenol, 14 pchloroaniline, 15 and carbamazepine. 16 MnO 2 -based catalysts such as α-MnO 2 /palygorskite, 17 MnFe 2 O 4 /α-MnO 2 , 18 and α-MnO 2 /graphite 19 were manufactured, and they displayed excellent catalytic performance for PMS activation. Therefore, the determination of the dominant crystal plane of the basic material can provide a meaningful research basis for subsequent studies.…”