J. Mater. Sci. Technol. ›› 2022, Vol. 101: 49-59.DOI: 10.1016/j.jmst.2021.05.052

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Metal-organic framework derived multi-functionalized and co-doped TiO2/C nanocomposites for excellent visible-light photocatalysis

Mian Zahid Hussaina,b, Zhuxian Yanga, Ahmed M.E. Khalila,c, Shahzad Hussaind, Saif Ullah Awane, Quanli Jiaf, Roland A. Fischerb, Yanqiu Zhua, Yongde Xiaa,*()   

  1. aCollege of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, United Kingdom
    bDepartment of Chemistry and Catalysis Research Centre, Technical University of Munich, Garching, 85748, Germany
    cDepartment of Chemical Engineering, Faculty of Engineering, Cairo University, Giza 12613, Egypt
    dDepartment of Physics, COMSATS University Islamabad, 45550 Pakistan
    eDepartment of Electrical Engineering, National University of Sciences and Technology, Islamabad, Pakistan f Henan Key Laboratory of High Temperature Functional Ceramics, Zhengzhou University, Zhengzhou 450052, China
  • Received:2021-04-02 Revised:2021-03-28 Accepted:2021-03-28 Published:2022-02-28 Online:2021-07-30
  • Contact: Yongde Xia
  • About author:* E-mail address: Y.Xia@exeter.ac.uk (Y. Xia).

Abstract:

Multi-functionalized and co-doped TiO2/C nanocomposites were derived from the pyrolysis of Ti-MOFs at 800 °C under different gaseous atmospheres and their photocatalytic performance were investigated. The gaseous atmosphere during pyrolysis plays a critical role in determining the structural, textural, optical and physicochemical properties of the derived TiO2/C composites due to the synergistic effect of nitrogen-containing species, carboxylate and sulfur functionalized porous carbon as well as N/S co-doped TiO2 nanoparticles. All the Ti-MOFs derived TiO2/C composites exclusively possess homogeneously distributed TiO2 nanoparticles in a functionalized disc-like porous carbon matrix and demonstrate much enhanced adsorption and photodegradation performance than commercial TiO2 under the same conditions. The adsorption of methylene blue (MB) in dark on these TiO2/C composites are dominated with pseudo second-order kinetic model and the high adsorption capacity of MB in dark on composite TiO2/C derived from MIL-125(Ti) in argon is due to its high surface area with predominant mesoporous carbon matrix in the composite. The composite N-O-TiO2/C derived from NH2-MIL-125(Ti) in water vapor exhibited the highest photodegradation activity with 99.7% MB removal in 3 hours under visible light due to the optimal anatase/rutile phasejunction, together with the formation of photoactive oxygen-rich N-O like interstitial/intraband states above the valence band of TiO2, as well as the presence of N-containing species and -OH/-COOH multi-functional groups with superhydrophilic nature of the composite. This simple one-step and easily modifiable approach can be further employed to modulate homogeneously dispersed multi-functionalized and co-doped metal oxide/carbon nanocomposites for various environment and energy-related applications.

Key words: Nanocomposite, MOF derivative, TiO2, Porous carbon, Photocatalysis