期刊
ENVIRONMENTAL SCIENCE-NANO
卷 6, 期 3, 页码 798-808出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8en01365a
关键词
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资金
- National Natural Science Foundation of China [51808140, 51838005, 51538013]
- National Key Research and Development Plan of China [2016YFA0203200]
- Natural Science Foundation of Guangdong Province [2018A030313487]
- Young Innovative Talent Project in Higher Education of Guangdong Province [2017KQNCX150]
- Special Funds for the Cultivation of Guangdong College Students' Scientific and Technological Innovation (Climbing Program Special Funds) [PDJHA0393]
Cu-Doped mesoporous polyimide nanocomposites (Cu-MP NCs) are developed via an in situ doping and hydrothermal polymerization method for the first time, which shows high activity and efficiency for refractory pollutant degradation, through a Fenton-like process in a very wide pH range (2.6-10.4). The reaction rate for pollutant removal is 15-21 times higher than that of the conventional Fenton catalyst. Based on the experimental and theoretical results, Cu+ and Cu2+ exist on the surface of Cu-MP NCs and bond with the aromatic rings of the polyimide substrate, through C-O-Cu bonding bridges, which induce cation-pi interactions and result in the formation of electron-rich centers around Cu and an electron-deficient center on the bonding aromatic rings. During Fenton-like reactions, the pi-pi stacking between the aromatic rings of Cu-MP NCs and the aromatic rings of pollutants results in the adsorption and electron-donation of pollutants on the electron-deficient centers of Cu-MP NCs. This serves to inhibit H2O2 overoxidation and further accelerates the electron transfer cycles from the electron-deficient centers to the electron-rich centers through pi. cation interaction via a C-O-Cu bridge and from the electron-rich centers to H2O2 with the generation of (OH)-O-center dot.
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