Pt quantum dots decorated nest-like 3D porous ZnO nanostructures for enhanced visible-light degradation of RhB
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Pt quantum dots decorated nest‑like 3D porous ZnO nanostructures for enhanced visible‑light degradation of RhB Yi Xia1,2 · Thiquynhxuan Le1,3 · Jinhui Peng1 · A. V. Ravindra1 · Lei Xu1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this work, a novel Pt/ZnO composite: Pt quantum dots decorated nest-like 3D porous ZnO nanostructures has been prepared via a simple and effective method. The effect of loading Pt quantum dots on photocatalytic properties of ZnO nanostructures is investigated by using SEM, TEM, EDX, XPS, PL, UV–Vis DRS, and BET studies. The results show that nest-like 3D porous ZnO nanostructures can be rapidly synthesized at 80 ℃ for 30 min under microwave heating. Subsequently, the metallic Pt quantum dots are successfully supported and uniformly distributed on the nest-like ZnO nanostructures by photochemical method to form the Pt/ZnO composite. The loading of Pt quantum dots on the nest-like 3D porous ZnO nanostructures intensively increases the visible light absorption resulting in about 4 times higher current response to the visible light, together with the BET surface area enhancement by 75%, than that of the pure ZnO. As a result, Pt/ZnO composite exhibits high catalytic stability and photocatalytic activity towards the degradation of Rhodamine B. In addition, the enhanced photocatalytic activity of Pt/ZnO is attributed to the Pt quantum dots acting as excellent photosensitizer and transporter of photogenerated electrons under visible light, which can retard the recombination of electrons and holes. Keywords Pt quantum dots · Nest-like 3D porous ZnO nanostructures · Microwave heating · Photocatalysis · Rhodamine B
1 Introduction ZnO semiconductor photocatalysts have attracted much attention due to its high thermal stability, nontoxic nature, low cost, and high electron mobility [1, 2]. Nevertheless, ZnO can only absorb photons in ultraviolet (UV) range with a low photocatalytic activity due to its wide band gap nature and quick recombination of photogenerated electrons and * Yi Xia [email protected] * Lei Xu [email protected] 1
The Key Laboratory of Unconventional Metallurgy, Ministry of Education, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
2
Research Center for Analysis and Measurement, Kunming University of Science and Technology and Analytic & Testing Research Center of Yunnan, Kunming 650093, Yunnan, China
3
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
holes [3–7]. Since the visible light is the main component of the solar energy, it is therefore necessary to further increase the photocatalytic activity of ZnO under visible light to meet the requirements of current photocatalysis technology. In recent years, inorganic quantum dots have been reported to effectively transfer photogenerated electrons on the surface of semiconductor photocatalytics and improve the separation efficiency o
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