Immobilized nano porous BiFeO3 and preparation method thereof

Abstract

The invention discloses an immobilized nano porous BiFeO3 material and a preparation method thereof. The method comprises the following steps: firstly preparing a NiO / macroscopic base material monolithic catalyst by virtue of a dipping method, heating to 550 DEG C to 600 DEG C under nitrogen protection and then feeding CH4, C2H4 or CO under a normal pressure so as to grow carbon nanofibers; then feeding N2 to blow away the rest of CH4, C2H4 or CO, cooling to a room temperature, dipping the obtained carbon nanofibers solidified on a macroscopic base material into an ethanol solution of a metal nitrate containing Bi and Fe, carrying out suction filtration, sequentially drying an obtained sample at 120 DEG C and 300 DEG C for 0.5 hour each time, repeatedly carrying out dipping and suction filtration and drying for 3 to 4 times; and finally, roasting the sample in the air by controlling the temperature within 475 DEG C to 525 DEG C so as to obtain the immobilized nano porous BiFeO3 material with a good orientation. The immobilized nano porous BiFeO3 material is simple in preparation process, controllable in shape, low in production cost and high in repeatability.

Description

technical field [0001] The invention relates to an immobilized nanoporous BiFeO 3 The invention and a preparation method thereof belong to the field of inorganic materials. Background technique [0002] Bismuth ferrite (BiFeO 3 ) as a ferroelectric material and piezoelectric material, due to its anti-fatigue properties and high Curie temperature, it has good application potential in microwave, storage, sensors and smart devices. At the same time, BiFeO 3 With its unique electronic structure, excellent visible light absorption ability and high organic degradation ability, it has aroused great interest of many researchers in the field of photocatalysis. [0003] Currently reported BiFeO 3 There are many kinds of preparation methods, mainly high-temperature solid-phase synthesis method, sol-gel method, hydrothermal method, co-precipitation method, combustion method and so on. The BiFeO prepared by the above method 3 The samples mainly exist in the state of nano-powder, an...

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Problems solved by technology

Nano-carbon fiber template technology can be used to solidify nanoporous BiFeO3 on the macroscopic matrix material by impregnation method, and by optimizing the preparation process conditions, high-quality macroscopic matrix and microscopic particles can be finally obtained. This type of material is expected to show better catalytic performance in the application of visible light catalytic degradation of organic dyes, which is mainly due to the fact that BiFeO3 solidified on the macroscopic However, due to the disadvantages of bulk photocatalytic materials in actual use, they have potential practical application prospects, and no reports on this work have been seen so far.

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