A visible-light-responsive n,b co-doped in 2 o 3 /tio 2 Precursor, its preparation method and application

Abstract

The invention discloses a visible light responsive N, B co-doped In 2 O 3 / TiO 2 Precursors, preparation methods and applications thereof. TheIn 2 O 3 / TiO 2 In the precursor, the N element accounts for 1 to 3% of the mass of the precursor, the B element accounts for 0.01 to 0.6% of the mass of the precursor, and the molar ratio of In to Ti is 0.001 to 0.03. N, B co-doped In of the present invention 2 O 3 / TiO 2 The precursor can be dissolved in ordinary solvents, so that it can be loaded on fibers, molecular sieves, silicon wafers, glass flakes and other substrates through simple impregnation. The loaded substrate is roasted at high temperature in the air, and the precursor is transformed into N and B co-doped MiscellaneousIn 2 O 3 / TiO 2 The photocatalyst is supported on the substrate, which not only solves the problem of recycling the catalyst, but also solves the problem of ordinary TiO 2 The problem is that the catalyst does not respond to visible light.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a visible light responsive N, B co-doped In 2 o 3 / TiO 2 Precursors, their preparation methods and applications. Background technique [0002] Since the 20th century, with the continuous development and progress of science and technology, the global industry has achieved unprecedented development. However, while the development of industry is promoting economic development and bringing convenience to human life, it is also ruthlessly destroying the environment on which human beings live. The air pollution and water pollution brought about by industrial development have an impact on people's lives. has become increasingly apparent. As an advanced oxidation technology, the photocatalytic oxidation technology based on semiconductor catalysts has attracted increasing attention from scholars at home and abroad. Almost all organic compounds can be completely oxidized to CO by photo...

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Problems solved by technology

[0003] TiO 2 The photocatalytic properties of semiconductors have been confirmed by many researches, but there are two key problems to be solved in order to be practical: ① Traditional photocatalytic research is generally carried out in a suspended photocatalytic reaction system, where TiO 2 The powder is easy to agglomerate, and it is difficult to realize the continuous separation, recovery and regeneration of the catalyst; ②TiO 2 Photocatalytic oxidation can only be carried out in the limited wavelength range of ultraviolet light, and the proportion of utilizing sunlight is low, which limits the popularization and application of photocatalytic technology

However, the obtained catalyst exists in the form of powder, which is not conducive to the recycling of the catalyst. Even if it is recovered, it is easy to agglomerate when it is used for the second time after recovery, thereby reducing the photocatalytic performance and making the utilization rate of titanium dioxide per unit mass low.

[0006] In summary, the TiO prepared by the prior art 2 Photocatalysts generally exist in the form of powder, and the photocatalytic reaction is generally carried out in a suspended photocatalytic reaction system, which is difficult to settle and recover, and TiO 2 The powder is easy to agglomerate, and it is difficult to realize the continuous separation, recovery and recycling of the catalyst; there are also related studies on loading the powder, but there are generally problems of uneven loading and easy powder drop; moreover, ordinary TiO 2 The catalyst only responds to ultraviolet light, and the ultraviolet part of sunlight accounts for less than 5%, these problems severely limit the TiO 2 Practical application of photocatalyst

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