Cu2+/Cu+ cycle promoted PMS decomposition with the assistance of Mo for the degradation of organic pollutant

Sulfur vacancies on MoS2 enhanced the activation of peroxymonosulfate through the co-existence of radical and non-radical pathways to degrade organic pollutants in wastewater

“…This indicated that the 1 O 2 species existed in this reaction system and played an important role in the degradation of organic pollutants. There were several formed sources of 1 O 2 , and they are as follows: (i) O 2 ˙ − as an intermediate, 33,43 as shown in formulas (3-10) and (3-11); (ii) the vacancies interacted with PMS; 43 and (iii) O 2 ˙ − reduced Mo( vi ), 44 as shown in formulas (3-12):2O 2 ˙ − + H 2 O → H 2 O 2 + OH − + 1 O 2 O 2 ˙ − +˙OH + 2H + → OH − + 1 O 2 Mo( vi ) + O 2 ˙ − + 2H + → Mo( iv ) + 1 O 2 …”

“…as shown in formulas(3)(4)(5)(6)(7)(8)(9)(10) and(3)(4)(5)(6)(7)(8)(9)(10)(11); (ii) the vacancies interacted with PMS; 43 and (iii) O 2 c À reduced Mo(VI),44 as shown in formulas(3)(4)(5)(6)(7)(8)(9)(10)(11)(12):2O 2 c À + H 2 O / H 2 O 2 + OH À + 1 O 2 (3-10) O 2 c À +cOH + 2H + / OH À + 1 O 2 (3-11)Mo(VI) + O 2 c À + 2H + / Mo(IV) + 1 O 2(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) …”

A new FeOCl/graphene quantum dot catalyst for peroxymonosulfate activation to efficiently remove organic pollutants and inactivate Escherichia coli

“…The sulfate radical-based advanced oxidation processes (SR-AOPs) that activate peroxymonosulfate (PMS) or persulfate (PS) to generate sulfate radicals (SO 4 − ˙) and hydroxyl radicals (HO˙) have recently been widely investigated. 1–3 Compared with HO˙, SO 4 − ˙ exhibits many superiorities, such as broad working pH range, long half-life, and high redox potential (HO˙, E 0 = 2.8 V; SO 4 − ˙, E 0 = 2.5–3.1 V). 2,4–6 PMS commonly can be activated by UV, heat, ultrasonication, and transition metal ions.…”

“…have recently been widely investigated. [1][2][3] Compared with HO , SO 4 À exhibits many superiorities, such as broad working pH range, long half-life, and high redox potential (HO , E 0 = 2.8 V; SO 4 À , E 0 = 2.5-3.1 V). 2,[4][5][6] PMS commonly can be activated by UV, heat, ultrasonication, and transition metal ions.…”

Pomegranate-Like CuO2@SiO2 Nanospheres as H2O2 Self-Supplying and Robust Oxygen Generators for Enhanced Antibacterial Activity

“…In recently years, reactive oxygen species (ROS)-based antimicrobial strategies have attracted tremendous research interests. , Among them, Fenton and Fenton-like reactions are simple approaches that induce intracellular oxidative stress by converting less-reactive hydrogen peroxide (H 2 O 2 ) into hydroxyl radical (•OH), the most detrimental ROS . Nevertheless, off-the-shelf formulations for the on-demand production of •OH are not yet feasible because of the slow rate of the metal-ion catalytic redox cycle (e.g., Cu 2+ /Cu + ) , and the extremely short half-life of the generated •OH in solutions (10 –9 s) . Diverse tactics have been adopted to ameliorate the applicability of the Fenton system, involving the utilization of solar photo, , electricity, advanced catalysts, − and reducing agents such as catechol, − as well as to accelerate the reductive conversion of metal ions and H 2 O 2 production.…”