Boosting hydroxyl radical generation for highly efficient electrooxidation of sulfamethazine via facile doping strategy

Tian Y; Kong L; Zou H; Liu M; Liu G

2024-09-01

10.1016/j.horiz.2024.100103

Sustainable Horizons   影响因子和分区

2772-7378

2772-7378

The one-electron water oxidation reaction (WOR) to generates hydroxyl radicals (OH) plays a pivotal role in electrochemical advanced oxidation processes (EAOPs). In this study, we present a novel and facile strategy involving Ho-doping to regulate the electronic configuration of the conventionally nonactive PbO electrode. Experimental findings demonstrate that PbO doped with 2.4% Ho achieves the highest degradation performance of sulfamethazine (SMZ) (∼100%; k = 0.093 min) and highest OH generation efficiency with a relatively concentration of OH = 1.9 × 10. The doped electrodes exhibit a notable enhancement compare to the undoped electrode, which elevating SMZ degradation efficiency and OH generation by factors of 1.45 and 3.8, respectively. Electrochemical characterization and degradation results elucidate that the modulation of electron transfer rate and oxygen evolution potential are crucial factors governing the performance of the Ho-doped PbO anode. Specifically, maintaining a suitably high oxygen evolution potential (OEP) enables the thermodynamically feasible production of OH, while a relatively fast electron transfer rate ensures the generation of HO (the oxidation precursor of OH) with kinetic feasibility. Furthermore, a degradation pathway for SMZ is proposed based on the identification of transformation mechanism using density functional calculation (DFT) and the detection of intermediates via LC-MS/MS. This study provides an universal strategy for simultaneously enhancing the OEP and optimizing the electron transfer rate of an EAOP anode through the modulation of anodic electronic configuration, thereby advancing the field of efficient water treatment applications.

Electrogeneration of •OH Electronic modulation Ho-PbO2 anodes Sulfamethazine

EI

英语

非南科大

20241415846452

Degradation ; Efficiency ; Electron transitions ; Electrooxidation ; Free radical reactions ; Lead oxide ; Oxygen ; Water treatment

Water Treatment Techniques:445.1 ; Electron Tubes:714.1 ; Electrochemistry:801.4.1 ; Chemical Reactions:802.2 ; Chemical Products Generally:804 ; Production Engineering:913.1

2-s2.0-85189106711

Scopus

2024

Tian Y,Kong L,Zou H,et al. Boosting hydroxyl radical generation for highly efficient electrooxidation of sulfamethazine via facile doping strategy[J]. Sustainable Horizons,2024,11(11).

Tian Y,Kong L,Zou H,Liu M,&Liu G.(2024).Boosting hydroxyl radical generation for highly efficient electrooxidation of sulfamethazine via facile doping strategy.Sustainable Horizons,11(11).

Tian Y,et al."Boosting hydroxyl radical generation for highly efficient electrooxidation of sulfamethazine via facile doping strategy".Sustainable Horizons 11.11(2024).