Bismuth ferrite/bismuth tungstate heterojunction photocatalytic material and preparation method thereof

Abstract

The invention discloses a bismuth ferrite / bismuth tungstate heterojunction photocatalytic material and a preparation method thereof. The photocatalytic material is prepared from Bi2Fe4O9 and bismuth tungstate, and the bismuth tungstate is attached to the Bi2Fe4O9. The method comprises the following steps: mixing a bismuth ferrite solution, a bismuth nitrate solution and a sodium tungstate solution, adjusting the pH value to 4-6, and carrying out a hydrothermal reaction on suspension liquid to obtain the bismuth ferrite / bismuth tungstate heterojunction photocatalytic material. The photocatalytic material has the advantages of being wide in visible light absorption range, excellent in photocatalytic performance, good in stability, high in reusability, and the like, and is a visible-light responsive semiconductor photocatalytic material with a wide application prospect; the preparation method of the photocatalytic material has the advantages of being mild in reaction conditions, simple inpreparation process, environmentally-friendly, and the like. The photocatalytic material provided by the invention can be used for degrading rhodamine B in water, shows efficient catalytic performance, and realizes the rapid and effective degradation of the rhodamine B, thus having a better application prospect.

Description

technical field [0001] The invention belongs to the field of functional nanometer materials, and relates to a heterojunction semiconductor material and a preparation method thereof, in particular to a bismuth ferrite / bismuth tungstate heterojunction photocatalytic material and a preparation method thereof. Background technique [0002] With the rapid development of the economy, the problems of energy shortage and environmental pollution are becoming more and more serious. Exploring new energy sources and developing new technologies for environmental purification have become important issues in today's society. Compared with conventional energy sources, solar energy has three major advantages as a new energy source, namely, economy, environmental protection, and regeneration. How to convert solar energy into new energy and to remove pollutants has become a research hotspot. Semiconductor photocatalysis technology is the most studied and mature technology in recent years, wh...

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Problems solved by technology

In addition, in Bi 2 Fe 4 o 9 There are also the following problems in the preparation process of bismuth tungstate heterojunction materials: (1) pure phase Bi 2 Fe 4 o 9 Difficult to prepare, in pure phase Bi 2 Fe 4 o 9 The preparation of B is easily affected by temperature, pH and reaction time. If Bi containing impurities is used 2 Fe 4 o 9 Preparation of bismuth ferrite / bismuth tungstate heterojunction materials, as a result it is difficult to form Bi 2 Fe 4 o 9 / Bi 2 WO 6 Z-type heterojunction; (2) During the preparation of composite materials, Bi 2 Fe 4 o 9 It may also be transformed into other substances, such as Bi 2 Fe 4 o 9 May be converted to BiFeO 3 , the result is that Bi cannot be formed 2 Fe 4 o 9 / Bi 2 WO 6 Z-type heterojunction; (3) Bi 2 Fe 4 o 9 It may dissolve part of itself in a strong acidic solution, thereby affecting the generation of composite materials; (4) in the preparation of Bi 2 Fe 4 o 9 / bismuth tungstate process, Bi 2 Fe 4 o 9 The amount of addition will have a great impact on the performance of the composite material; (5) in Bi 2 Fe 4 o 9 In the preparation process of bismuth tungstate heterojunction materials, if the Bi 2 Fe 4 o 9 Different from the preparation method and raw materials of bismuth tungstate, it will make the prepared Bi 2 Fe 4 o 9 / The physical and chemical properties of bismuth tungstate heterojunction materials are completely different, that is, Bi 2 Fe 4 o 9 The physical and chemical properties of bismuth tungstate and bismuth tungstate determine whether the Z-type heterojunction photocatalytic material can be successfully prepared; (6) in Bi 2 Fe 4 o 9 In the preparation process of bismuth tungstate heterojunction materials, the main material and the modification material used are different, which has an important impact on the performance of the composite material. If it is simply replaced, the composite material will not be able to be synthesized. For example, Bi 25 FeO 40 as the main material, Bi 2 WO 6 As a modified material, it will lead to the inability to prepare Z-type heterojunction photocatalytic materials; (7) The synthesis conditions of conventional methods are relatively harsh, and the requirements for temperature and operation are strict, which will increase the cost of preparation

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