Catalytic Ozonation of Ketoprofen with In Situ N-Doped Carbon: A Novel Synergetic Mechanism of Hydroxyl Radical Oxidation and an Intra-Electron-Transfer Nonradical Reaction

Environmental Science & Technology
Zhiqiang SunJun Ma

Abstract

A novel synergetic mechanism of hydroxyl radical (•OH) oxidation and an intra-electron-transfer nonradical reaction was found in the catalytic ozonation of ketoprofen (KTP) with the in situ N-doped hollow sphere carbon (NHC). Outperforming the conventional •OH-based catalytic ozonation process, O3/NHC not only realized an enhancement of the pseudo-first-order rate constant of 11 times in comparison with that of O3 alone, but was also endowed with a high stability over a wide pH (4-9) and temperature (15-35 °C) range for the degradation of KTP. The high graphitization degree (ID/IG = 0.78-0.88) and low unsaturated oxygen content (0.10-1.38%) of NHC highlighted the dominant role of N-heteroatoms in the O3/NHC system. The specific effects of different N species were confirmed by a relationship study (N property vs catalytic activity) and X-ray photoelectron spectroscopy characterization. The graphitic N forming in the bulk of the graphitic structure served as the "electron-mobility" region to promote KTP degradation with the transfer of electrons from the KTP molecule to O3 via a nonradical reaction process. The pyrrolic and pyridinic N located at defects of the graphitic structure acted as the "radical-generation" region to decom...Continue Reading

References

Oct 25, 2001·Journal of the American Chemical Society·A KuznetsovaJ G Chen
Oct 20, 2007·Science·Haeshin LeePhillip B Messersmith
Oct 13, 2009·Journal of the American Chemical Society·Xiaolin LiHongjie Dai
Feb 4, 2010·ChemSusChem·Dang Sheng SuRobert Schlögl
Sep 13, 2012·ACS Applied Materials & Interfaces·Hongqi SunShaobin Wang
Jun 1, 2013·Chemical Reviews·Dang Sheng SuGabriele Centi
Jun 12, 2013·The Science of the Total Environment·Jonas MargotD A Barry
Feb 7, 2014·Chemical Society Reviews·Xiang-Kai KongQian-Wang Chen
Jan 31, 2015·ACS Applied Materials & Interfaces·Xiaoguang DuanShaobin Wang
Oct 10, 2015·Environmental Science & Technology·Yang ZhouLi-Peng Yuan
Mar 2, 2018·Accounts of Chemical Research·Xiaoguang DuanShaobin Wang

❮ Previous
Next ❯

Related Concepts

Related Feeds

Basal Ganglia

Basal Ganglia are a group of subcortical nuclei in the brain associated with control of voluntary motor movements, procedural and habit learning, emotion, and cognition. Here is the latest research.