Novel Li@ZnWO 4 nanocomposite materials with enhanced photoactivity for degradation of MB
- PDF / 1,752,392 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 49 Downloads / 182 Views
Novel Li@ZnWO4 nanocomposite materials with enhanced photoactivity for degradation of MB Li He1 Received: 5 February 2020 / Accepted: 27 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Li@ZnWO4 was synthesized by a facile hydrothermal method. The as-prepared nanostructures were characterized by various techniques including TEM, XRD, XPS, FT-IR, Raman analysis, etc. Meanwhile, the photocatalytic activity of the Li@ZnWO4 was evaluated by the degradation of methylene blue (MB) solution under UV–Vis irradiation. Li@ZnWO4 has excellent photocatalytic performance. The mechanism has been confirmed and discussed in detail. The Li@ZnWO4 photocatalyst has good stability in the catalytic process.
1 Introduction With the rapid development of economy, science, and technology, energy and environment problems have become the main reason restricting the social development and a key factor affecting the sustainable development of mankind. The development and utilization of new green energy and the control and treatment of environmental pollution have become hot issues that must be solved in the development of human society. Semiconductor photocatalytic materials arouse scientists’ interest because of their excellent performances on light absorption, photocatalysis, and photoelectric conversion [1]. If solar energy can be fully utilized to realize energy conversion and degradation of pollutants, and put into practical application, the development of the semiconductor photocatalytic materials will become one of the effective ways to solve the problem of environment and energy, therefore the semiconductor photocatalytic materials and photocatalytic technologies have important theoretical guidance and practical significance [2]. In recent years, tungstate photocatalytic materials have attracted extensive attention due to their unique crystal structure, excellent stability, and good light absorption capacity [3, 4]. As a member of the tungstate family, ZnWO4 plays an important role. However, there are two main drawbacks of ZnWO4 that hinder the industrial application prospect: first, * Li He [email protected] 1
the light absorption is mainly concentrated in the ultraviolet region; second, the low separation rate of photogenerated electron and hole pairs restricts REDOX reaction [5]. As we know, the preparation process and method have a great influence on the properties of nanomaterials [6]. At present, researchers have adopted different methods, such as hydrothermal, solid-state, microwave solvothermal, etc. [7–12], by controlling the synthesis conditions such as adjusting the pH and temperature to change the morphology and increase the crystallinity to improve the photocatalytic activity of Z nWO4 [13–15]. Besides, element doping and material compounding can further enhance the photocatalytic activity of Z nWO4. Doping with F, Eu, In, Dy, etc., changes the surface properties and energy-level structure of the semiconductor, and improves the photo-response range and the quantum yield
Data Loading...
