Black Ta2O5, and preparation method and application thereof

Abstract

The invention discloses a preparation method of black Ta2O5. The preparation method comprises the following steps: dissolving TaCl5 in absolute ethyl alcohol, adding an acetylacetone stabilizer, and magnetically stirring to obtain a TaCl5 sol precursor; aging the TaCl5 sol precursor in a drying oven, taking out a blocky solid at the bottom, and transferring the blocky solid into a ball milling tank, and performing ball milling to obtain tantalum oxide gel powder; feeding the tantalum oxide gel powder into a muffle furnace, heating, and performing heat preservation to obtain white Ta2O5 powder;uniformly mixing and grinding the white Ta2O5 powder and NaBH4, putting the obtained mixture into a tubular furnace, carrying out annealing treatment in a protective atmosphere, and cooling to obtainthe black Ta2O5. Low-valence Ta4<+> ions and oxygen vacancies are introduced into Ta2O5 crystal lattices to improve the visible light absorption, enhance the photo-induced electron and hole separation efficiency and realize efficient degradation of methylene blue pollutants in the water body through photocatalysis, toxic and harmful reagents are not used, the period is short, and the method is anew method capable of simply and rapidly producing the black Ta2O5 photocatalytic material on a large scale.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a kind of black Ta 2 o 5 Preparation method and application of photocatalyst. Background technique [0002] The problem of environmental pollution in the world has been paid more and more attention. The governments of various countries have put forward higher requirements and formulated stricter standards for the treatment of harmful substances, but due to various reasons, no satisfactory results have been achieved. Therefore, it is very necessary to develop new and practical environmental protection treatment technology. With the deepening of research, people found that semiconductor photocatalysis technology can be widely used in water and air purification, bacteria and virus killing, odor control, water splitting and nitrogen fixation due to its good photostability and high efficiency. In particular, heterogeneous photocatalytic oxidation has a remarkable effect on the removal...

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Problems solved by technology

Patent Publication No. CN 104874415B reports a nitrogen-doped hollow TaON structure, but electrospinning equipment and technology are used in the preparation, resulting in high production cost and relatively complicated process

Patent Publication No. CN104826643B reports a kind of N-doped Ta which can work under visible light 2 o 5 And CdS heterostructure, to obtain a certain visible light catalytic effect, but the material used in the preparation process of toxic and harmful metal ions Cd 2+ , which limits its large-scale application

[0005] After researching related literature reports and patents of tantalum oxide nanomaterials at home and abroad, there is no research on black Ta 2 o 5 Preparation and precedents in photocatalytic applications driven by visible light

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