Photocatalytic reaction system, preparation method thereof and method for improving utilization rate of photon and photocatalyst of photocatalytic reaction system

Abstract

The invention discloses a photocatalytic reaction system, a preparation method thereof and a method for improving the photon and catalyst utilization rate thereof. The photocatalytic reaction system can be a photocatalytic degradation reaction system, and the photocatalytic degradation reaction system adopts an optical fiber as a photocatalyst and a light carrier and adopts a micro-channel reactor as a reactor. The preparation method of the photocatalytic degradation reaction system comprises the following steps: loading the photocatalyst on the optical fiber; connecting the optical fiber loaded with the photocatalyst with a light source; the area, loaded with the photocatalyst, of the optical fiber is arranged in a micro-channel of the micro-channel reactor. According to the photocatalytic reaction system, light energy can be concentrated in the photocatalyst, efficient coupling utilization of photons and the catalyst is achieved, and therefore the reaction with the high mass transfer speed, the high reaction rate and the high conversion rate can be achieved.

Description

technical field [0001] The present application relates to but not limited to the technical field of photocatalysis, especially a photocatalytic reaction system and its preparation method, and a method for improving the photon and photocatalyst utilization rate of the photocatalytic reaction system at the same time. Background technique [0002] Photocatalytic technology, taking photocatalytic degradation as an example, is a green technology with important application prospects in the environmental field. It utilizes TiO 2 When the semiconductor photocatalyst absorbs light energy under light conditions, when the energy of light reaches or exceeds the semiconductor band gap, the electrons in the valence band will be excited to the conduction band, and relatively stable holes will be obtained in the valence band to form electrons. - Pair of holes. The photogenerated electrons and holes can be transferred to the surface of the catalyst and the H in the external environment 2 O...

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Problems solved by technology

This method has the advantages of simple equipment and convenient operation, but there are also some significant disadvantages: (1) The light path from the light source to the catalyst is long, and it will absorb and scatter when passing through the transmission medium (air, water, etc.) And form a large light loss, resulting in a decrease in photon utilization efficiency; (2) After the light contacts the catalyst, except for a part of it being absorbed and utilized, a considerable proportion of the light will pass through the catalyst and continue to be transmitted. The proportion of effective light is low, which not only causes the waste of light energy but also leads to the inability to fully utilize the potential of the catalyst, which indirectly leads to the reduction of the effective utilization rate of the catalyst itself; (3) the catalyst cannot be recycled and used to disperse Catalysts present in the degradation solution will become a new pollutant

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