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Issue 9, 2017
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Solvothermal-assisted synthesis of self-assembling TiO2 nanorods on large graphitic carbon nitride sheets with their anti-recombination in the photocatalytic removal of Cr(VI) and rhodamine B under visible light irradiation

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Abstract

TiO2-based nanorods (TNRs) were self-assembled on large graphitic carbon nitride (g-C3N4) sheets via the solvothermal-assisted route. The results demonstrated that the effective anchoring of TNRs (a side length of ca. 200–300 nm) was highly dispersed on the surface of whole g-C3N4 sheets. The shift in the Ti 2p XPS core level spectrum indicated an increase in the net positive charge of the Ti ions, ensuring the formation of an interface between TNRs and g-C3N4. The charge transferred from g-C3N4 sheets to TNRs effectively prevented the recombination of excited charges, which is consistent with the significant quenching of PL. The extent of visible-light-sensitive photocatalytic (PC) activity was evaluated by the removal of potassium dichromate (Cr(VI)) or the degradation of rhodamine B (RhB). The photocatalytic removal of Cr(VI) using RhB was effectively improved. The synergistic effect between the removal of Cr(VI) and degradation of RhB was revealed by multiple utilization of TNRs/g-C3N4 for PC activity. The effective suppression of the recombination of photo-induced charges and the absorption of RhB was responsible for the enhancement in the PC activity. An alternate mechanism for enhanced visible-light photocatalytic activity was also considered.

Graphical abstract: Solvothermal-assisted synthesis of self-assembling TiO2 nanorods on large graphitic carbon nitride sheets with their anti-recombination in the photocatalytic removal of Cr(vi) and rhodamine B under visible light irradiation

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Publication details

The article was received on 24 Nov 2016, accepted on 02 Jan 2017 and first published on 04 Jan 2017


Article type: Paper
DOI: 10.1039/C6NR09137G
Citation: Nanoscale, 2017,9, 3231-3245

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    Solvothermal-assisted synthesis of self-assembling TiO2 nanorods on large graphitic carbon nitride sheets with their anti-recombination in the photocatalytic removal of Cr(VI) and rhodamine B under visible light irradiation

    D. Lu, P. Fang, W. Wu, J. Ding, L. Jiang, X. Zhao, C. Li, M. Yang, Y. Li and D. Wang, Nanoscale, 2017, 9, 3231
    DOI: 10.1039/C6NR09137G

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