Preparation method of aerogel-based photocatalytic material

Abstract

The invention discloses a preparation method of an aerogel-based photocatalytic material, and belongs to the technical field of photocatalytic material preparation. Iron ions doped in titanium dioxidesol is subjected to a reaction with photo-generated electrons and holes in titanium dioxide, and a prepared titanium dioxide film is of a nano anatase structure; because band gap energy of the anatase phase is higher than that of the rutile phase, the surface of titanium dioxide is coated with a layer of silica gel, and the surface area of silicon dioxide is larger, so that hydroxyl groups serveas trapping sites of holes to stop combination of electron-hole pairs; besides, titanium dioxide and silicon dioxide are partially compounded, silicon dioxide or Ti-O-Si bonds hinder mutual contact among particles, and accordingly, a powdery nano material prepared from the prepared photocatalytic material can be cured on a massive matrix to improve photocatalytic reaction efficiency; the used matrix raw materials are biomass raw materials and are healthy, nontoxic and easy to degrade and recycle, and the application prospect is broad.

Description

technical field [0001] The invention discloses a preparation method of an airgel-based photocatalytic material, and belongs to the technical field of photocatalytic material preparation. Background technique [0002] Photocatalytic materials refer to a type of semiconductor catalyst material required for photochemical reactions that occur through the material under the action of light, and are chemical reactions that occur under the action of light. Photochemical reactions require molecules to absorb electromagnetic radiation of a specific wavelength, and are excited to generate molecular excited states, which then undergo chemical reactions to generate new substances, or become intermediate chemical products that trigger thermal reactions. The activation energy of photochemical reactions comes from the energy of photons. In the utilization of solar energy, photoelectric conversion and photochemical conversion have always been very active research fields. There are many pho...

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Problems solved by technology

[0007] The technical problem mainly solved by the present invention is that the current existing photocatalysts have a wide band gap and can only absorb and utilize ultraviolet light with a wavelength less than 387nm in sunlight, and only about 3% to 5% of sunlight can be utilized. The response of visible light is small, and the photocatalytic efficiency is low, which leads to the defects of low solar energy utilization efficiency, and a preparation method of airgel-based photocatalytic materials is provided.

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