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Synthesis, characterization and enhanced visible-light photocatalytic activity of novel NiO/HTi2NbO7 nanocomposite

Abstract

The novel NiO/HTi2NbO7 nanocomposite was successfully synthesized by assembling HTi2NbO7 nanosheets with the nickel hydroxide precursor. The as-prepared NiO/HTi2NbO7 nanocomposite and its precursors were characterized by means of X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) with energy dispersive spectrometer (EDS), N2 adsorption-desorption measurements, X-ray photoelectron spectroscopic (XPS), UV-vis diffuse reflection spectroscopy (UV-vis DRS), laser Raman spectroscopy (LRS), 1H magic angle spinning nuclear magnetic resonance (1H MAS NMR) spectra, current-time (i-t) curves and Mott-Schottky (M-S) curves. The catalytic activities of the as-prepared materials were evaluated by the photodegradation of methylene blue (MB) dyes. The results showed that NiO nanoparticles were distributed on the surface of HTi2NbO7 nanosheets successfully. The significant interaction between dispersed NiO species and the hydroxyl groups on the nanosheets was observed via the 1H-MAS NMR study of the nanocomposite, which was rarely explored before. The nanocomposite displayed enhanced visible-light photocatalytic activity compared to that of NiO nanoparticles and HTi2NbO7 nanosheet aggregation, which could result from the improved visible-light region absorption intensity and the decreased electron-hole recombination rate. It is suggested that this improvement comes from the synergistic effect between the host HTi2NbO7 and guest NiO in the nanocomposite.

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Publication details

The article was received on 21 Feb 2018, accepted on 08 May 2018 and first published on 15 May 2018


Article type: Paper
DOI: 10.1039/C8NJ00877A
Citation: New J. Chem., 2018, Accepted Manuscript
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    Synthesis, characterization and enhanced visible-light photocatalytic activity of novel NiO/HTi2NbO7 nanocomposite

    J. Li, L. Xu, J. He, L. Hu, L. Da and B. Wang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00877A

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