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Materials (Basel). 2016 Nov 15;9(11). pii: E927. doi: 10.3390/ma9110927.

ZnO-Layered Double Hydroxide@Graphitic Carbon Nitride Composite for Consecutive Adsorption and Photodegradation of Dyes under UV and Visible Lights.

Author information

1
School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia. l.zhang9@uq.edu.au.
2
Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia. l.li2@uq.edu.au.
3
School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia. x.sun5@uq.edu.au.
4
School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia. p.liu2@uq.edu.au.
5
School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia. d.yang@uq.edu.au.
6
School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia. george.zhao@uq.edu.au.

Abstract

In this work, a ZnO-layered double hydroxide@graphitic carbon nitride composite (ZnO-LDH@C₃N₄) was synthesized via co-precipitation method with solvothermal treatment. The structure and morphology of ZnO-LDH@C₃N₄ composite were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopes/transmission electron microscopes (SEM/TEM), N₂ adsorption/desorption, ultraviolet visible diffuse reflectance spectroscopy (UV-Vis-DRS), photoluminescence spectrometer (PL) and electrochemical impedance spectroscopy (EIS). The adsorption and photocatalytic properties of ZnO-LDH@C₃N₄ composite towards the organic dyes: Orange II sodium salt (OrgII, an anionic azo dye) and methylene blue (MB, a cationic azo dye) were investigated. Compared to ZnO-LDH and g-C₃N₄, the ZnO-LDH@C₃N₄ composite displayed an excellent performance in both adsorption and photocatalytic degradation of the organic dyes. Moreover, a combination of ZnO-LDH and g-C₃N₄ significantly improved the photocatalytic performance of ZnO-LDH and g-C₃N₄ under visible-light irradiation. The adsorption and photocatalytic mechanism were also investigated.

KEYWORDS:

adsorption; graphitic carbon nitride; layered double hydroxide; photocatalysis; zinc oxide

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