Abstract
By the deposition of noble metal nanoparticles on a metal oxide substrate with a specific micro-/nanostructure, namely, yolk-shell structure, a remarkable improvement in photocatalytic performance can be achieved by the composites. Nevertheless, noble metal nanoparticles only distribute on the surface shell of metal oxide substrates when the conventional wet-chemistry reduction approach is employed. Herein, we proposed a novel acoustic levitation synthesis of Pt nanoparticles deposited on yolk-shell La2O3. The composites not only displayed well-defined, homogeneous distribution of Pt NPs on the exterior shell of La2O3 and the interior La2O3 core, but an enhanced chemical interaction between Pt and La2O3. The unique structure not only can display improved photocatalytic degradation rate toward methyl orange, but also may show great potential in fields of hydrogen generation, environmental protection, etc. The novel acoustic levitation synthesis can supplement the methodology of synthesizing well dispersed noble metal oxides over the whole yolk-shell structure through noble metal NPs deposition method.
Highlights
Along with the rapid development of industry, dyestuff wastewater has become a severe environmental issue for their biodegradability and carcinogenicity to human bodies [1,2].Photocatalysis has been proven an effective way to eliminate dyes in wastewater by converting them into nontoxic matters without secondary pollution [3,4,5]
The amplified transmission electron microscope (TEM) images demonstrate the Pt NPs were uniformly dispersed on the surface of the shell
A Pt deposited yolk-shell La2 O3 composite was successfully prepared by a novel acoustic levitation approach
Summary
Along with the rapid development of industry, dyestuff wastewater has become a severe environmental issue for their biodegradability and carcinogenicity to human bodies [1,2]. Deposition of Pt NPs on yolk-shell metal oxides can be a promising alternative for high-performance photocatalysts. Though tremendous efforts have been devoted to the synthesis of Pt NPs deposited yolk-shell metal oxides composites, the conventional wet-chemistry reduction approach can only construct yolk-shell composites with Pt coatings on the exterior shells of the metal oxides [14,15,16]. The inhomogeneous distribution of Pt in the whole yolk-shell structure is adverse to attaining catalysts with high photocatalytic activity due to the fewer catalytic active sites resulting from the declined interfacial and interaction areas between noble metal NPs and metal oxides [17,18,19,20]. Our research supplements the synthesis of well-defined homogeneous noble metal NPs/yolk-shell metal oxides by noble metal NPs deposition
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