Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 24, Issue 18, Pages 15622-15633Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-017-9067-5
Keywords
Photocatalysis; Hybrid photocatalyst; Zinc oxide; Copper; Gold; Solar light; Diuron; Water treatment
Categories
Funding
- Ministry of Higher Education and Scientific Research of Tunisia
- French Agence Nationale de la Recherche [ANR-13-ECOT-010]
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We report on the facile and low-temperature one-pot chemical synthesis of lightly doped Zn1-xCuxO and hybrid Au-Zn1-xCuxO photocatalysts with low Cu molar content (0 < x < 0.7%) using 1,3-propanediol polyol simultaneously as solvent, reducing and a stabilizing agent, without any final thermal treatment. The photocatalysts have been characterized by X-ray diffraction, N-2 adsorption study, UV-vis diffuse reflectance spectroscopy, inductively coupled plasma optical emission spectroscopy, and transmission electron microscopy. The lightly doped hybrid Au-Zn1-xCuxO photocatalysts consisted in faceted quasi-spherical large-size Au nanoparticle cores surrounded by closely packed small-size Zn1-xCuxO nanoparticles. Taking the photocatalytic degradation of Diuron under solar light as liquid-phase test reaction, the lightly doped Au-Zn1-xCuxO hybrid photocatalysts with optimized x = 0.09% Cu content showed strongly enhanced photocatalytic activity when compared to the bare ZnO counterpart. The observed 16-fold higher degradation rate constant resulted jointly from the light doping of ZnO with Cu to form Zn1-xCuxO photocatalyst and further from the addition of gold nanoparticles allowing interfacial oxide-to-metal electron transfer within the hybrid Au-Zn1-xCuxO photocatalyst.
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