One-pot synthesis of lightly doped Zn1−x Cu x O and Au–Zn1−x Cu x O with solar light photocatalytic activity in liquid phase
2017
Fkiri, Anis | Santacruz, Marisa Rico | Mezni, Amine | Smiri, Leila-Samia | Keller, Valérie | Keller, Nicolas
We report on the facile and low-temperature one-pot chemical synthesis of lightly doped Zn₁₋ₓ Cu ₓ O and hybrid Au–Zn₁₋ₓ Cu ₓ O 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, N₂ adsorption study, UV–vis diffuse reflectance spectroscopy, inductively coupled plasma optical emission spectroscopy, and transmission electron microscopy. The lightly doped hybrid Au–Zn₁₋ₓ Cu ₓ O photocatalysts consisted in faceted quasi-spherical large-size Au nanoparticle cores surrounded by closely packed small-size Zn₁₋ₓ Cu ₓ O nanoparticles. Taking the photocatalytic degradation of Diuron under solar light as liquid-phase test reaction, the lightly doped Au–Zn₁₋ₓ Cu ₓ O 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₋ₓ Cu ₓ O photocatalyst and further from the addition of gold nanoparticles allowing interfacial oxide-to-metal electron transfer within the hybrid Au–Zn₁₋ₓ Cu ₓ O photocatalyst.
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