Method for preparing ion-free sources of morphology-controlled bismuth tungstate and bismuth vanadate nanomaterials

Abstract

The invention discloses a method for preparing ion-free sources of morphology-controlled bismuth tungstate and bismuth vanadate nanomaterials. The method comprises the following steps of: respectively immersing a bismuth elementary substance target, a tungsten elementary substance target and a vanadium elementary substance target which have a purity of 99.99 percent into deionized water; irradiating the bismuth elementary substance target, irradiating the tungsten elementary substance target and irradiating the vanadium elementary substance target by using Nd:YAG pulse laser with a wavelength of 1,064nm and pulse energy of 100Mj for 5 minutes, 25 minutes and 15 minutes respectively to obtain bismuth colloids, tungsten colloids and vanadium colloids respectively; uniformly mixing the bismuth colloids and the tungsten colloids in a volume ratio of 1:1, feeding the mixture into a high pressure reaction kettle with a polytetrafluoroethylene liner, and reacting at the temperature of 200 DEG C for 15 hours to obtain a Bi2WO6 nanomaterial; and uniformly mixing the bismuth colloids and the vanadium colloids in a volume ratio of 1:1, feeding the mixture into the high pressure reaction kettle with a polytetrafluoroethylene liner, and reacting at the temperature of 200 DEG C for 15 hours to obtain a BiVO4 nanomaterial. By the method, nanomaterials and nano structures of Bi2WO6 and BiVO4 with different morphology are synthesized; and the PH value of the bismuth / tungsten mixed colloids is adjusted, so that the morphology-controlled Bi2WO6 nano structure with uniformly distributed sizes can be synthesized in a controlled manner.

Description

technical field [0001] The present invention relates to a kind of bismuth tungstate (Bi 2 WO 6 ), bismuth vanadate (BiVO 4 ) preparation of nanomaterials, in particular to an ion-source-free preparation method of bismuth tungstate and bismuth vanadate nanomaterials with controllable morphology. Background technique [0002] Nanoscale Bi 2 WO 6 、BiVO 4 As a new type of energy and catalytic material, due to its good visible light response characteristics and shape-dependent optical, electrical, and magnetic properties, it has a wide range of applications in clean energy, water phase pollutant degradation, and other fields. How to obtain Bi with nanometer size and shape controllable 2 WO 6 、BiVO 4 Nanostructures have been the focus of numerous studies. [0003] In the prior art, the traditional Bi 2 WO 6 、BiVO 4 The preparation methods mainly include high-temperature solid-state reaction method, mechanical ball milling method, hydrothermal reaction method and so on....

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Problems solved by technology

For example, in addition to the high reaction temperature required for high-temperature solid-state reaction, it cannot control the size and shape of the generated substance well during the synthesis process like the mechanical ball milling method; in comparison, the temperature required for the preparation of nanomaterials by the hydrothermal method is even higher. It is a commonly used method in the synthesis of nanomaterials, but the precursors used in hydrothermal reactions are mostly inorganic / organic ionic salts, and the use of ionic salts gives Difficulty in sample cleaning and contamination of nanostructures with other ion sources

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