Catalytic properties of the composite of La-doped ZnO nanorods and Ag 2 CrO 4 nanoparticles
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Catalytic properties of the composite of La‑doped ZnO nanorods and Ag2CrO4 nanoparticles Fucheng Yu1 · Dongmei Nan1 · Bolong Wang1 · Zhengyan Liu1 · Yuanmeng Li1 · Ling He1 · Xianxi Tang1 · Jianbin Zhang1 Received: 2 March 2020 / Accepted: 22 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract To study the application of ZnO in photocatalysis, a composite of La-doped ZnO nanorods and A g2CrO4 nanoparticles was prepared by hydrothermal and precipitation methods. At a fixed concentration, the volume of Ag+ precursor has a significant effect on the composition and structure of the composite. With the increase in the A g+ source volume, the amount of Ag2CrO4 nanoparticles generated in the composite increases. When the volume of the Ag+ source exceeds some critical value, although the amount of A g2CrO4 nanoparticles in the composite continues to increase, the quality of the crystals is lower. Both the content and crystal quality of A g2CrO4 nanoparticles affect the photocatalytic properties of the composite. The introduction of additional oxygen vacancy defects in nanorods leads to the formation of more, and larger, A g2CrO4 nanoparticles in the composite without degradation of crystal quality. Then, two dyes (methyl orange and methylene blue) were selected to examine the photocatalytic properties of the samples. The improvement of photocatalytic performance of the composite samples is realized by the separation of electron–hole pairs in both ZnO and Ag2CrO4 crystals. Keywords La-doped ZnO nanorods · Oxygen vacancy defects · Ag2CrO4 nanoparticles · Photocatalysis
1 Introduction In recent years, with the rapid development of modern science and technology, environmental problems have attracted more attention among researchers, especially with regard to organic-compound-rich pollutants and heavy metal ions. Therefore, how to solve these problems has become a major challenge for the development of modern human society [1, 2]. Meanwhile, water pollution is a significant environmental problem. Considering the disadvantages of low purification efficiency, low recycling efficiency, high preparation cost, and generation of secondary pollution, traditional water treatment methods could not meet current requirements for pollutant treatment, so more advanced methods are required [3–5]. Furthermore, with the increasing depletion of oil resources, the use of green energy is becoming more important. As an efficient, simple, green method, photocatalytic * Fucheng Yu [email protected] 1
School of Material Science and Engineering and School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, People’s Republic of China
technology shows its unique advantages and has been widely studied in the degradation of organic pollutants for the purification of water sources [6, 7]. Semiconductors, as photocatalysts, play an important role in photocatalysis and are among the most popular materials used at present given their excellent optical and photoelectric properties [8–
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