Origins of Electron-Transfer Regime in Persulfate-Based Nonradical Oxidation Processes

Abstract

Persulfate-based nonradical oxidation processes (PS-NOPs) are appealing in wastewater purification due to their high efficiency and selectivity for removing trace organic contaminants in complicated water matrices. In this review, we showcased the recent progresses of state-of-the-art strategies in the nonradical electron-transfer regimes in PS-NOPs, including design of metal and metal-free heterogeneous catalysts, in situ/operando characterization/analytical techniques, and insights into the origins of electron-transfer mechanisms. In a typical electron-transfer process (ETP), persulfate is activated by a catalyst to form surface activated complexes, which directly or indirectly interact with target pollutants to finalize the oxidation. We discussed different analytical techniques on the fundamentals and tactics for accurate analysis of ETP. Moreover, we demonstrated the challenges and proposed future research strategies for ETP-based systems, such as computation-enabled molecular-level investigations, rational design of catalysts, and real-scenario applications in the complicated water environment. Overall, this review dedicates to sharpening the understanding of ETP in PS-NOPs and presenting promising applications in remediation technology and green chemistry.

Insights into the degradation of emerging organic pollutants by peroxydisulfate activated with Co3O4@NiO: role of each component and catalytic mechanism

“…8A, the CV curve of Co 3 O 4 @NiO-2 shows obvious redox peaks, revealing its good electrochemical reversibility. 25 Importantly, in comparison with Co 3 O 4 and NiO, the CV curve of Co 3 O 4 @NiO-2 displayed higher current density, proving its redox ability. 31 Fig.…”

“…Thus, it could be identified with the possible presence of and ˙OH. 24,25 Because of the lack of α-H, TBA could only react with ˙OH. It was observed from Fig.…”

Recent advances in metal-free catalysts for the remediation of antibiotics, antibiotic resistant bacteria (ARB), and antibiotic resistant genes (ARGs)

“…13 Second-order rate constants (k) for reactions of various antibiotics and commonly used quenching agents with ROS (i.e., cOH, SO 4 c À , 1 O 2 , and Clc). 218, [284][285][286] This journal is © The Royal Society of Chemistry 2022 KMnO 4 -based AOPs would be boosted. In their study, the graphite mediated one-electron transfer from sulfamethoxazole to KMnO 4 led to high KMnO 4 utilization efficiency.…”

Efficient activation of peroxymonosulfate by C3N5 doped with cobalt for organic contaminant degradation

“…Persulfate-based advanced oxidation technologies have been studied extensively in both laboratory and field applications in recent years. [1][2][3] Peroxymonosulfate (PMS) is a popular oxidant for the generation of reactive species due to its asymmetric structure and ease of decomposition. 3,4 The conventional PMS homogenous activation process by transition metal ions (Co 2+ , Cu 2+ and Fe 2+ ) is an effective method for pollutant degradation but usually suffers from the toxicity of metal ions.…”