Synergetic activation of peroxymonosulfate by Co3O4 modified g-C3N4 for enhanced degradation of diclofenac sodium under visible light irradiation

By Huixin Shao, Xu Zhao, Yanbin Wang, R. Mao, Yan Wang, Meng Qiao, Shen Zhao, Yong Zhu. 2017

277 citations recorded by the source corpus.

Abstract Co 3 O 4 nanoparticles modified g‐C 3 N 4 composites (Co 3 O 4 -g-C 3 N 4 ) were prepared and used as a visible light responsive photocatalyst for the removal of diclofenac sodium (DCF). The Co 3 O 4 -g-C 3 N 4 with 0.20% Co 3 O 4 loading exhibited the highest photocatalytic activity towards DCF degradation among the various Co 3 O 4 loading. In the presence of peroxymonosulfate (PMS), the removal efficiency of DCF with an initial concentration of 10 mg/L was greatly increased from 20% to 100% within 30 min and the first order-kinetic constant was increased from 0.00469 to 0.08403 min −1 . Influencing factors including DCF concentrations, PMS concentrations, and initial pH values were investigated in details. Low pH value was favorable to DCF degradation. Reactive oxygen species generated in the photocatalytic process were identified by radical quenching tests and electron spin response. It was proposed that both sulfate and hydroxyl radicals contributed to the degradation of DCF. PMS could be activated by photogenerated electrons from the Co 3 O 4 -g‐C 3 N 4 hybrids under visible light, as well as the Co 3 O 4 itself to generate sulfate radicals jointly. Hydroxyl radicals were generated from the reaction between sulfate radicals and H 2 O/OH − . As a result, DCF was efficiently degraded.

Subfields: Renewable Energy, Sustainability and the Environment, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/1f9cc1d9f18116f25408aa25ea36c564e54cd5a6

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Citations in the corpus

• Unveiling the origin of boosted photocatalytic hydrogen evolution in simultaneously (S, P, O)-Codoped and exfoliated ultrathin g-C3N4 nanosheets (2019, background): “for practical application, pristine g-C3N4 suffers from fast recombination of photogenerated carriers, low surface area and low density of active sites [18-21].”