Almost 100 % electron transfer regime over Fe−Co dual-atom catalyst toward pollutants removal: Regulation of peroxymonosulfate adsorption mode

Single-Atom Mn–N4 Catalyst with Electron-Rich O and S Self-Doping for Cooperative Nonradical and Radical Oxidation: Overlooked Nonmetal Heteroatomic Sites

“…•− and 1 O 2 generation, 45 which is consistent with our previously proven conclusion that singleatom Mn sites can activate PMS to produce 1 O 2 . Therefore, the Type I model was considered the optimal PMS adsorption model on single-atom Mn sites.…”

“…Among them, the Type I model (Figure d) showed the highest affinity of PMS for the single atomic Mn site, indicating that this is the most likely adsorption model. Moreover, the ended oxygen single-bonded with S adsorbed on single-atom Mn sites in the Type I model can facilitate the SO 5 ·– and 1 O 2 generation, which is consistent with our previously proven conclusion that single-atom Mn sites can activate PMS to produce 1 O 2 . Therefore, the Type I model was considered the optimal PMS adsorption model on single-atom Mn sites .…”

“…Besides, O 2 ·– scavenging had little effect on IBU removal (Figure b), and self-degradation of PMS also made an insignificant contribution to the generation of 1 O 2 (Figure b). However, the addition of ethylenediaminetetraacetic acid (EDTA), a chelating reagent for metal active sites, , exhibited a comparable inhibitory effect to FFA (only ∼30.6% removal of IBU, Figure b), suggesting that Mn–N 4 sites would be the reactive center for 1 O 2 generation. EPR result (Figure e) further demonstrated that the Mn–N 4 active sites play a dominant role in 1 O 2 generation during PMS activation as the generation of 1 O 2 was significantly inhibited in the presence of EDTA.…”

N-Doped Co–Mn/C Dual Metal Oxide as an Activator of Peroxymonosulfate Considering Radical and Nonradical Pathways

“…For example, the MnCo 2 O 4.5 catalyst with precise cubic configurations showed excellent performance in tetracycline removal through PMS activation, featuring strong Mn–O/Co–O and Mn–O–Co bonds that minimize Mn/Co leaching . The CoFe 2 O 4 bimetallic catalyst and the Fe–Co dual-atom catalyst have also demonstrated high efficacy in activating peracetic acid for sulfamethoxazole removal and PMS activation, respectively. , However, bimetallic catalysts face challenges such as aggregation and metal ion leaching, highlighting the need for further stability enhancement . Manganese oxides are ideal for bimetallic catalyst synthesis with cobalt due to their low toxicity, cost-effectiveness, diverse valence states, and abundant reserves. − The Mn 2+ /Mn 3+ /Mn 4+ redox cycle in Mn plays a crucial role in activating PMS for efficient organic pollutant removal in aqueous systems via enhanced electron transfer pathways. − …”

Ultrafast removal of organics via peroxymonosulfate activation over Co2P/TD hollow spheres derived from ZIF-67

“…Peroxymonosulfate-based advanced oxidation processes (PMS-AOPs) have attracted increasing attention for wastewater purification due to the generation of various reactive oxygen species (ROSs) for the degradation of refractory organics. 1 PMS can be activated easily by transition metal heterogeneous catalysts (TMHCs), homogeneous catalysts like transition metal ions (Fe 2+ , Co 2+ , Cu 2+ , and Mn 2+ ), heating, light, and ultrasound due to its asymmetric structure. 2–4 Among them, Co-based TMHCs are extensively applied to activate PMS owing to the high stability, good reusability, and high efficiency.…”