Synthesis of S-Doped porous g-C3N4 by using ionic liquids and subsequently coupled with Au-TiO2 for exceptional cocatalyst-free visible-light catalytic activities

Fazal Raziq, Muhammad Humayun, Asad Ali, Tingting Wang, Abbas Khan, Qiuyun Fu, Wei Luo, Heping Zeng, Zhiping Zheng, Bilawal Khan, Huahai Shen, Xiaotao Zu, Sean Li, Liang Qiao

Research output: Contribution to journalArticlepeer-review

144 Scopus citations

Abstract

The development of new technologies for carbon dioxide reduction, water splitting, and pollutant degradation has been a demanding challenge in the globe due to critical energy and environmental issues. Herein, we have successfully synthesized sulfur doped porous g-C3N4 (S-PCN) using ionic liquid, and then coupled nanocrystalline anatase TiO2 and Au-modified TiO2 to obtain nanocomposites. The amount-optimized 1 Au-6 T/6S-PCN nanocomposite exhibits exceptional visible-light activities for CO2 conversion to CH4, H2 evolution, and 2,4-dichlorophenol degradation, respectively by ∼32-time (365 μmol g−1h−1), ∼41-time (330 μmol g−1h−1) and ∼24-time (95% 10 mg h−1L−1) enhancement compared to the porous g-C3N4 (PCN). The calculated quantum efficiencies for CH4 production and H2 evolution are ∼4.67% and ∼3.34% at 420 nm wavelength. Based on these results, it is suggested that the exceptional photoactivities are attributed to the large surface area (100.5 m2g−1), extended visible-light response and enhanced charge separation via dopant induced surface-states and subsequently coupled Au-TiO2. Furthermore, the [rad]CO2 and [rad]H as active radicals would be dominant to respectively initiate CO2 and H2O reduction, and the produced [rad]OH plays a vital role in 2,4-dichlorophenol degradation. This work demonstrates that the designed PCN-based nanocomposites show promising applications in CO2 photo-reduction, water splitting, and pollutant degradation.
Original languageEnglish (US)
Pages (from-to)1082-1090
Number of pages9
JournalApplied Catalysis B: Environmental
Volume237
DOIs
StatePublished - Dec 5 2018
Externally publishedYes

ASJC Scopus subject areas

  • General Environmental Science
  • Catalysis
  • Process Chemistry and Technology

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