Synthetic process of bismuth-doped potassium niobate

Abstract

The invention discloses a synthesis process method of bismuth-doped potassium niobate, comprising the following steps: analyzing pure Nb 2 o 5 Add analytically pure KOH to 25ml of deionized water, stir until evenly mixed, then transfer to a hydrothermal kettle, tighten the lid of the kettle, and place it in an oven to react for a certain period of time; after the reaction, take out the reaction kettle and let it cool naturally to room temperature, open the lid of the kettle, take out the product and filter, wash with deionized water and absolute ethanol several times, and obtain potassium niobate after drying under normal pressure at 60°C; take Nb 2 o 5 0.2g, KOH0.36g, Bi(NO 3 )·5H 2 O, according to the molar ratio of Bi / Nb is 0.25%, 0.5%, 0.75%, 1%, and 5% added in different proportions, at 240 ° C, hydrothermal reaction for 24 hours, the obtained samples of potassium niobate doped with Bi are all Appears as white powder. The invention develops a doped modified niobate nano-catalyst with catalytic activity under sunlight through the modification treatment of metal bismuth functional components doped with potassium niobate.

Description

technical field [0001] The invention relates to semiconductor heterogeneous photocatalytic oxidation technology, in particular to a synthesis process method of bismuth-doped potassium niobate. Background technique [0002] The key to photocatalytic research is to develop highly efficient photocatalysts. As a new photocatalytic material, perovskite-type niobium (tantalum) salt compounds have become the most popular photocatalysts due to their controllable composition and structure, good thermal stability, and low price. However, niobium (tantalum) salt compounds have their own limitations, such as low catalytic activity, especially high band gap energy, and cannot efficiently absorb the abundant visible light in the solar spectrum, which limits the promotion of this technology. Although it has been reported in the literature that the absorption spectrum of niobium (tantalum) salt compounds can be red-shifted by modifying them with metal or non-metal doping alone, the current...

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Problems solved by technology

[0003] In the exploratory research, although the solid-phase synthesis in the synthesis method of niobate is simple, the prepared particles have a large particle size, and the crystal form is not uniform, and there are many impurities, which are obviously detrimental to its photocatalytic activity.

The sol-gel method is feasible, but the ethoxides of niobium and tantalum are too expensive and the cost is too high

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