Method for preparation of nano-CoFe1.95Y0.05O4 powder and catalytic degradation of methyl orange

Abstract

Belonging to the technical field of nano and photocatalysis, the invention discloses a method for preparation of nano-CoFe1.95Y0.05O4 powder and catalytic degradation of methyl orange. A sol-gel method is employed to prepare the target product by controlling the amount of Y(NO3)3.6H2O, the baking temperature and the like, X-ray diffraction characterization finds that the XRD spectrum of the sample is completely consistent with PDF card (22-1806); TEM characterizes that the particle size is in the range of 16-26nm; diffuse reflection spectrum determination indicates that the CoFe1.95Y0.05O4 band gap is 1.71ev wide, and the ultraviolet region and visible region have strong absorption. A CoFe1.95Y0.05O4-H2O2-pH4 composite system is designed to study the methyl orange solution photocatalytic reaction, and experiments prove that: after 500w xenon lamp illumination on the solution for 2h, the methyl orange degradation rate is close to 100%. The nanocrystals synthesized by the method provided by the invention have the advantages of strong magnetism, high efficiency and complete photocatalytic degradation, etc. At the same time, the cost of the required raw materials is low, and the process is simple, can realize zero emission and has low energy consumption, thus being easy for industrial production.

Description

Technical field [0001] The invention belongs to the technical field of nanometer and photocatalysis, and more specifically, relates to nanometer CoFe 1.95 Y 0.05 O 4 The preparation of powder and the method of catalytic degradation of methyl orange. Background technique [0002] The problem of how to treat industrial wastewater pollution is imminent. The photocatalyst can generate free radicals with very strong oxidizing ability in the system due to the use of sunlight, which can undergo a series of chemical reactions with the organic pollutants in the wastewater to break the chemical bonds and degrade into Water and CO 2 Inorganic small molecules have become a hot spot of social concern. [0003] Currently, Zhang Xiuling and others prepare TiO 2 -CoFe 2 O 4 Catalytic degradation of methyl orange after 2h exposure to sunlight, (1g catalyst, 50ml concentration is 20mg.l -1 The degradation rate of methyl orange solution is 78.5%. Wu Guanghui et al. When the pH of methyl orange is 4,...

AI Technical Summary

Problems solved by technology

Niu Xinshu et al studied Y 3+ doped TiO 2 In the degradation of methyl orange in the ultraviolet light region, it is difficult to recover the catalyst, the process is complicated, and the preparation cycle is long.

There are still many problems in the field of photocatalysis: 1. Most photocatalysts have a high band gap, and the photocatalytic efficiency is reduced. Photocatalytic activity can only be produced under ultraviolet light, which is harmful to the environment and human body, and is inconvenient to operate, which limits its application. Part of the photocatalytic reaction is a heterogeneous reaction; 2. The recovery of the catalyst is more complicated, which will cause secondary pollution; 3. Some photocatalysts are only decolorized, the structure of the aromatic ring is not destroyed, and the degradation is not complete. Based on the above analysis, for Exploring the preparation of a visible light photocatalyst that is easy to separate, recycle, has high catalytic activity and high degradation rate, and the design of the photocatalytic experiment process has naturally become a research hotspot.

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