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Study on adsorption coupling photodegradation on hierarchical nanostructured g-C3N4/TiO2/activated carbon fiber composites for toluene removal

  • Original Paper: Sol-gel and hybrid materials for catalytic, photoelectrochemical and sensor applications
  • Published:
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Abstract

The hierarchical nanostructured g-C3N4/TiO2/activated carbon fiber (ACF) composites are fabricated by simple ultrasonic assisted sol–gel method to removal toluene gas. The results show g-C3N4/TiO2 is evenly loaded onto the ACF surface in the form of a smooth film. The g-C3N4/TiO2/ACF possess strong photocatalytic activity, and its removal efficiency is twice as high as that of TiO2. Compared with TiO2, photoluminescence fluorescence (PL) intensity of g-C3N4/TiO2/ACF decreases nearly 10 times. Interestingly, the significantly enhanced removal efficiency is due to the synergetic effects of adsorption coupling photodegradation and the formation of Ti–O–C bonds between g-C3N4/TiO2 and ACF. The chemical bonding interaction accelerates the separation efficiency of photogenerated charge carriers. The removal efficiency and adsorption amount can be up to 94% and 140.55 mg/g for toluene concentration of 400 mg/m3 and space velocity of 1000 h−1 with 6% g-C3N4/TiO2/ACF. The space-time-yield of g-C3N4/TiO2/ACF reaches 141.06 g h−1 L−1 much higher than that of ACF (73.29 g h−1 L−1) and g-C3N4/TiO2 (64 g h−1 L−1). The possible photodegradation pathway and mechanisms are proposed. Therefore, the g-C3N4/TiO2/ACFs porous composites possess excellent application potential for elimination volatile organic compounds from atmospheric environment.

Schematic diagram of the removal of toluene gas from g-C3N4/TiO2/ACF composites.

Highlights

  • Hierarchical nanostructured g-C3N4/TiO2/ACF are prepared for dynamic toluene removal.

  • g-C3N4/TiO2/ACF has synergetic effect of adsorption coupling photocatalysis.

  • The adsorption amounts of g-C3N4/TiO2/ACF reach 140.55 mg/g.

  • Removal efficiency of g-C3N4/TiO2/ACF is twice as high as that of TiO2.

  • Ti–O–C bonds accelerate separation efficiency of photogenerated charge carriers.

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Acknowledgements

This study was supported by the Open Project Program of State Key Laboratory of Petroleum Pollution Control (No. PPCIP2017005). Authors are also grateful to FL for checking English phrasing of the paper.

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Correspondence to Fang Liu.

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Li, Y., Liu, F., Li, M. et al. Study on adsorption coupling photodegradation on hierarchical nanostructured g-C3N4/TiO2/activated carbon fiber composites for toluene removal. J Sol-Gel Sci Technol 93, 402–418 (2020). https://doi.org/10.1007/s10971-019-05198-7

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  • DOI: https://doi.org/10.1007/s10971-019-05198-7

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