Understanding spatial effects of tetrahedral and octahedral cobalt cations on peroxymonosulfate activation for efficient pollution degradation

Insights into biochar supported atomically dispersed cobalt as an efficient peroxymonosulfate activator for sulfamethoxazole degradation: robust performance, ROS and surface electron-transfer pathways

“…7d and Table S2†) demonstrated that the proportion of octahedral Co in 0.5-Co–N@BC was reduced from 60.41% to 58.76% after the reaction. As octahedral Co has a high spin state, 25 its intrinsic activity is much higher than that of tetrahedral Co. 41 This is attributed to the fact that octahedral Co facilitates the adsorption of PMS and promotes the electron transfer process. 31,41 The correlation results also existed in the defect levels of Co–N@BC (Fig.…”

“…The cobalt content in Co-N@BC (Table S1 †) followed the increase of the cobalt-based complex proportion, and the cobalt loading in 0.5-Co-N@BC is 0.57 at%. However, the spin state, 31,40 coordination structure, 25,41 and chemical valence also determine the catalytic performance. In this regard, as revealed in Fig.…”

“…Regardless of the radical or non-radical pathway, the decisive steps for the PMS activation are the adsorption of PMS on the catalyst surface and the electron transfer between active sites and the PMS molecule. 31,41 The non-radical surface electron-transfer pathway also depends on the adsorption of target organic pollutants on catalysts. 10,21,27 The adsorption and activation sites for PMS and SMX in 0.5-Co-N@BC were investigated, and the results are shown in Fig.…”

Graphene Oxide-Supported Three-Dimensional Cobalt–Nickel Bimetallic Sponge-Mediated Peroxymonosulfate Activation for Phenol Degradation

“…Several pollutants (such as phenolic compounds), which are difficult to biodegrade due to their biological toxicity and high persistence, threaten the ecological balance and human health. , However, it is difficult for traditional wastewater treatment processes to remove phenolic pollutants completely . Advanced oxidation processes (AOPs) based on peroxymonosulfate (PMS) activation as an effective method that can initiate a chain reaction to generate sulfate radicals (SO 4 •– ), hydroxyl radicals (HO • ), and other reactive oxygen species (ROS) by breaking the O–O bond. , These active substances can degrade complex organic compounds into small molecular substances and thereby reduce toxicity. , So far, the known methods for activating PMS include, for example, ultraviolet (UV) radiation, ultrasound, thermal treatment, and photocatalysis . In general, these listed techniques all need external energy input.…”

“…•− ), hydroxyl radicals (HO • ), and other reactive oxygen species (ROS) by breaking the O−O bond. 5,6 These active substances can degrade complex organic compounds into small molecular substances and thereby reduce toxicity. 7,8 So far, the known methods for activating PMS include, for example, ultraviolet (UV) radiation, ultrasound, thermal treatment, and photocatalysis.…”