Method for degrading phenol-containing wastewater by modified tio2 catalyst in a rotating disk reactor

Abstract

The invention discloses a method for degrading phenol-containing wastewater with a modified TiO2 catalyst in a rotating disk reactor, comprising the following steps: (1) in-situ doping and modification of the catalyst to prepare a modified catalyst sol; (2) catalyst loading; (3) catalyst loading; (3) ) Design and installation of uniform light source; (4) Degradation of phenol-containing wastewater. The invention adopts the sol-gel method to complete the preparation, ion doping modification and loading of the catalyst at one time, and applies this technology to the rotating disk reactor to combine the advantages of the two, so as to improve the phenolic wastewater. Photocatalytic degradation efficiency.

Description

technical field [0001] The invention relates to a modified TiO in a rotating disk reactor 2 The invention discloses a method for degrading phenolic wastewater with a catalyst, belonging to the technical field of wastewater treatment. Background technique [0002] Photocatalytic oxidation technology has the characteristics of low energy consumption and no secondary pollution, and can completely mineralize organic matter into water, CO 2 It is a green and environmentally friendly organic wastewater treatment method. There are two main methods of photocatalytic treatment of wastewater: suspension method and loading method. In the suspension method, the nano-catalyst particles are in full contact with organic pollutants, and the solid-liquid mass transfer effect is good, but the separation of the catalyst becomes a technical problem. Although the loading method solves the separation problem of the catalyst, the mass transfer effect of this method is reduced because the loadin...

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Problems solved by technology

But there are three problems, (1) pure TiO 2 The photogenerated electron-hole pairs of the catalyst are easy to recombine, which makes the carrier utilization rate low, which is reflected in the degradation rate of phenol-containing wastewater is only 40% in 2 hours; (2) The binder method has a certain degree of embedding of the catalyst particles, The contact area between catalyst particles and organic pollutants is reduced, which reduces the utilization rate of the catalyst surface; (3) In the patent, the reactor is equipped with ultraviolet lamps above and below the turntable, and the distance between the horizontally placed ultraviolet lamps below the turntable and the inner wall of the reactor is relatively small. Far away, the light intensity attenuation is serious, and the economic investment is increased when the degradation rate is low; in actual operation, it is difficult to load the catalyst on the inner wall of the reactor; the light source is composed of two linear ultraviolet lamps, and the light intensity on the plate is not uniform , the difference between the light intensity directly below the lamp and the edge of the turntable is 10mW / cm 2 Left and right, far away from the lamp tube, the light intensity attenuation is serious

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