Novel N/Carbon Quantum Dot modified MIL-125(Ti) composite for enhanced visible-light photocatalytic removal of NO

Meijuan CHEN, Xiaoyan WEI, Liaoliao ZHAO, Yu HUANG, Shun-cheng LEE, Wing Kei HO, Kehao CHEN

Research output: Contribution to journalArticles

1 Citation (Scopus)

Abstract

Highly efficient and stable photocatalysts were synthesized at room temperature by modifying MIL-125(Ti) with N-doped carbon quantum dots (N/CM(Ti)). The N/CM(Ti) with 2.5 vol % N doped carbon quantum dots (N/CQDs) had the best light absorption and visible-light photocatalytic nitrogen oxide (NO) removal efficiency (approximately 49%). It was found through X-ray photoelectron spectroscopy analysis that a N–Ti–O bond was formed in the 2.5 vol % N/CM(Ti), which is more conducive to charge transfer. Photocurrent and electrochemical impedance data also showed that the carrier separation efficiency of 2.5 vol % N/CM(Ti) was significantly superior to that of MIL-125(Ti). In addition, the TiIII–TiIV of MIL-125(Ti) acts as the active center for photocatalytic removal of NO. Two possible electron migration paths were proposed: electron transfer from N/CQDs to TiIII–TiIV center of MIL-125(Ti) due to the photoinduced electron transfer property of N/CQDs, and absorption of UV light generated from the N/CQDs by the terephthalic acid ligand followed by electron transfer to metal active sites for photocatalytic removal of NO. Copyright © 2020 American Chemical Society.
Original languageEnglish
Pages (from-to)6470-6478
JournalIndustrial & Engineering Chemistry Product Research and Development
Volume59
Issue number14
Early online dateMar 2020
DOIs
Publication statusPublished - 2020

Citation

Chen, M., Wei, X., Zhao, L., Huang, Y., Lee, S.-C., Ho, W., & Chen, K. (2020). Novel N/Carbon Quantum Dot modified MIL-125(Ti) composite for enhanced visible-light photocatalytic removal of NO. Industrial & Engineering Chemistry Research, 59(14), 6470-6478. doi: 10.1021/acs.iecr.9b06816

Fingerprint Dive into the research topics of 'Novel N/Carbon Quantum Dot modified MIL-125(Ti) composite for enhanced visible-light photocatalytic removal of NO'. Together they form a unique fingerprint.