Surface modified nanometer TiO2 particle, preparation method thereof, application and method for reducing content of p-nitrophenol in wastewater

Abstract

The invention provides a surface modified nanometer TiO2 particle, a preparation method thereof, application and a method for reducing the content of p-nitrophenol in wastewater. The surface modified nanometer TiO2 particle comprises a nanometer TiO2 particle, the surface of which is combined with 1-hydroxy-2-naphthoic acid. In the invention, the 1-hydroxy-2-naphthoic acid including benzene ring is taken as a surface modifier to carry out surface modification on the nanometer TiO2 particle via a simple surface chemical adsorption method; meanwhile, the nanometer TiO2 reacts with an organic modifier by utilizing generalized acid and alkali properties of the nanometer TiO2 to generate similar esterification reaction and form a hexatomic ring compound with strong stability; and the benzene ring is bound on the surface of the nanometer TiO2 to improve the affinity for the aromatic pollutants.

Description

technical field [0001] The present invention relates to a kind of nano TiO 2 Particles, their preparation method, use and method for degrading the content of organic matter in wastewater, in particular to a surface-modified nano-TiO 2 Microparticles, their preparation method, use and method for degrading p-nitrophenol content in wastewater. Background technique [0002] TiO 2 It is an N-type semiconductor, which belongs to the excitation range of ultraviolet light (below 380nm), TiO 2 The electrons (e-) on the valence band can be excited to transition to the conduction band under the action of ultraviolet light, and corresponding holes (H + ). Then H + and e - with adsorption on TiO 2 H on the surface 2 O and so on react to generate OH - , O 2- These active groups can oxidize and decompose harmful organic substances such as formaldehyde and methylamine, pollutant odor, bacteria, etc. into harmless CO 2 and H 2 O. Due to nano TiO 2 It has broad application prosp...

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Problems solved by technology

[0004] Existing Nano TiO 2 Surface modification methods can be divided into two categories: physical adsorption surface modification method and surface modifier addition method. In physical adsorption surface modification method, there are organic substances in nano-TiO 2 The disadvantages of weak surface binding, easy elution, high energy consumption, complex equipment and technology, high cost, and difficulty in large-scale promotion; surface modifier addition methods include coupling methods, surface grafting methods and similar There are three kinds of esterification modification methods. Among them, the coupling method and surface grafting method are cumbersome, time-consuming, and costly; the esterification modification method uses organic matter and nano-TiO 2 The hydroxyl group on the surface is bonded, resulting in an esterification reaction similar to that between acid and alcohol. The operation is convenient, the cost is low, and the stability of the surface modification complex formed is improved, but it is still not ideal in terms of acid and alkali resistance. It is acidic or alkaline, which is not suitable for direct application to wastewater treatment, and the organic treatment agents currently used cannot be used in nano-TiO 2 The surface is linked with benzene rings, making it difficult to break through TiO 2 The bottleneck of adsorption of aromatic organic pollutants—the pollutants in TiO 2 low surface coverage

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