Imprinting-doped mesoporous TiO2 microspheres and preparation method and application thereof

Abstract

The invention provides a synthesis method and application for imprinting-doped mesoporous TiO2 microspheres. The synthesis method includes dissolving 1-5ml of titanium source substances into 100-200ml of organic solution, adding 0.1-0.3g of catalytic into the organic solution, adding 0.1-0.5g of target molecules used as imprinting molecules while stirring the mixture, and further adding metal salt with the molar ratio ranging from 0.1% to 8% relative to a titanium source so as to introducing doping ions; and continuing stirring for 1-12 hours, then enabling the solution to react in a high-temperature and high-pressure kettle at the temperature ranging from 80 DEG C to 180 DEG C for 3-6 hours, centrifugally washing to obtain white solid, placing the white solid in a muffle furnace at the temperature ranging from 400 DEG C to 450 DEG C, keeping the temperature for 2-4 hours and then obtaining the imprinting-doped mesoporous TiO2 microspheres. The prepared materials are used for degrading target organic pollutant in water, have higher photocatalytic activity as compared with pure TiO2(P25), and are capable of selectively degrading the target pollutant. In addition, the imprinting-doped mesoporous TiO2 microspheres have a wider photoresponse range as compared with pure TiO2 undoped with imprinting, and have high visible light absorption capacity.

Description

technical field [0001] The invention belongs to the field of semiconductor photocatalysts, in particular to a mesoporous titanium dioxide (TiO2) containing molecular imprints of organic pollutants and doped with metal ions. 2 ) microspheres and their preparation and use. Background technique [0002] Environmental endocrine disruptors refer to exogenous substances that intervene in the synthesis, secretion, in vivo transport, combination, action or decomposition of hormones in organisms, thereby affecting the normal maintenance of organisms, endangering reproduction, development or behavior, which can lead to a series of Biological damage, such as reproductive disorders and deformation of sexual organs, sex reversal, feminization, etc. Many chemicals in the environment have endocrine disrupting effects, including many refractory persistent organic pollutants (such as polychlorinated biphenyls, dioxins, organochlorine pesticides, etc.). Bisphenol A (BPA) is a plastic additi...

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Problems solved by technology

However, the disadvantage of this material is that the organic polymer modified layer is used, which is easily oxidized by the hydroxyl radicals produced by titanium dioxide, which makes the stability of the material not high and the service life not long.

[0007] (1) The photocatalyst obtained by preparing a layer of organic imprinted polymer with specific molecular recognition ability on the surface of titanium dioxide is not stable and has a short service life;

[0008] (2) with TiO 2 Prepared all-inorganic molecularly imprinted photocatalytic materials, due to TiO 2 The absorption wavelength range is narrow, and the absorption range is mainly in the ultraviolet region, so visible light cannot be used, and the utilization rate of sunlight is low (ultraviolet only accounts for 3-5%). Not suitable for exposure to ultraviolet light;

[0009] (3) Due to TiO 2 The photogenerated electron-hole pairs are easy to recombine, the photocatalytic activity is not high enough, and the quantum efficiency is low;

[0010] (4) The preparation process of all-inorganic catalysts with core / shell structure is relatively complicated

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