Preparation method of SBA-15 loaded N-doped TiO2 visible catalyst

Abstract

The present invention discloses a preparation method of an SBA-15 loaded N-doped TiO2 visible catalyst. The preparation method comprises the following steps of (1) dissolving P123 in hydrochloric acid solution, dropwise adding tetraethyl orthosilicate and stirring, thermostatically stirring up and filtrating the mixture solution; rinsing resulting precipitate until no chloride ion is present in the precipitate, and drying the precipitate to obtain SBA-15 intermediates; (2) mutually dissolving metatitanic acid, concentrated aqueous ammonia and hydrogen peroxide in an ice-water bath, sitring up the mixture solution to obtain a green yellow solution, adding the SBA-15 intermediates into the green yellow solution, so as to obtain a suspension; (3) removing the resulting suspension into a microwave reactor, so as to obtain an intermediate product; (4) filtering, scrubbing, drying and calcining the intermediate product, so as to obtain a finished product. The SBA-15 with surfactant is used as carrier, so as to effectively keep the ordered pore canal structure of the carrier, ensure high absorption capacity, and effectively prevent TiO2 from glomerating during the heat treatment process, with low manufacture cost..

Description

technical field [0001] The present invention relates to a kind of TiO 2 preparation method, especially a SBA-15 loaded N-doped TiO 2 Preparation method of visible light catalyst. Background technique [0002] TiO 2 The material is odorless, non-toxic, has high light stability, good thermal stability and chemical stability, and has high photocatalytic activity. It is considered to be the most environmentally friendly photocatalytic material with development prospects and application potential. But currently TiO 2 The effect of powder materials for sewage treatment and ambient air purification is not satisfactory. The main problems are: (1) The quantum size effect makes TiO 2 The band gap of the material is widened, the redox potential is increased, and the driving force of the photocatalytic reaction is increased, but nano-TiO 2 However, the material has disadvantages such as easy deactivation, easy condensation, and difficulty in recycling. (2) Traditional TiO 2 The m...

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Problems solved by technology

But currently TiO 2 The effect of powder materials for sewage treatment and ambient air purification is not satisfactory. The main problems are: (1) The quantum size effect makes TiO 2 The band gap of the material is widened, the redox potential is increased, and the driving force of the photocatalytic reaction is increased, but nano-TiO 2 However, the material has disadvantages such as easy deactivation, easy condensation, and difficulty in recycling.

(2) Traditional TiO 2 The material has photoexcitation activity only under the irradiation of ultraviolet light with a wavelength not greater than 387 nm, and the energy of the ultraviolet band in sunlight only accounts for about 5% of the total solar energy, and most of the energy of visible light (about 45%) has not yet been obtained. Take advantage of

[0004] But the above method can only solve TiO 2 There are one or two problems, such as the use of semiconductors with narrow band gaps such as CdS for recombination may improve visible light catalytic activity and electron-hole separation efficiency, but the specific surface area will decrease, while TiO 2 The oxidation ability of the catalyst will also be reduced; although the high specific surface area carrier loading will increase the adsorption of the target and improve the photocatalytic efficiency, the visible light activity will not be improved.

Moreover, these preparation methods have problems such as complex process, poor stability or need for more complicated equipment.

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