Nano-titanium dioxide and polyphosphazene based composite optical catalyst and preparation method thereof

Abstract

The invention discloses a nano-titanium dioxide and polyphosphazene based composite optical catalyst and a preparation method thereof in the technical field of catalyst preparation. The preparation method comprises the steps of: putting 1 part by weigh of hexachlorocyclotriphosphazenes, 2.16 parts by weigh of bisphenol and 1-5 parts by weigh of nano-titanium dioxide into 2500 parts by weigh of organic solvent, and obtaining a dispersing solution after ultrasonic dispersion; further adding 73 parts by weigh of acid binding agent, obtaining the dispersion solution of a target product through warming water bath, and filtering, washing and drying to obtain the nano-titanium dioxide and polyphosphazene based composite optical catalyst. In the invention, the nano-titanium dioxide and polyphosphazene based composite optical catalyst with a nuclear shell structure is obtained by cladding and modifying Degussa P25 nano-titanium dioxide with polyphosphazene. Compared with the P25, the optical catalyst has an excellent absorption property on a target organic pollutant and shows higher optical catalytic activity in the presence of the irradiation of ultraviolet light.

Description

technical field [0001] The invention relates to a method in the technical field of catalysts, in particular to a composite photocatalyst based on nano titanium dioxide and polyphosphazene and a preparation method thereof. Background technique [0002] With the acceleration of industrialization, a large amount of industrial waste containing various organic compounds is discharged into nature, causing serious pollution to the ecology. To solve this pressing problem, photocatalytic degradation technology has attracted much attention in the past two decades due to its higher efficiency compared with traditional biodegradation pathways. Anatase nano-titanium dioxide has the characteristics of high catalytic activity, non-toxicity and good chemical stability, and is one of the most commonly used photocatalysts. However, the adsorption of titanium dioxide to target organic pollutants is poor, the catalytic activity is not high in the environment of low pollutant concentration, and...

AI Technical Summary

Problems solved by technology

[0003] Found through literature search to prior art, Holland " applied catalysis, B series: environment " periodical in 2008 the 79th volume 2 phase 171~178 pages (T.Guo, Z.P.Bai, C.Wu, T.Zhu ,Influence of relative humidity on the photocatalytic oxidation(PCO)of toluene by TiO 2 loaded on activated carbon fibers: PCO rate and intermediates accumulation, Applied Catalysis B: Environmental, 2008, 79(2): 171-178) reported a surface-loaded composite light formed by loading nano-titanium dioxide particles on the surface of porous activated carbon fibers. Catalyst, the photocatalyst has excellent adsorption capacity and photocatalytic activity to toluene, but the firmness of this method is relatively weak, and the nano-titanium dioxide particles are easy to fall off from the surface of the porous activated carbon fiber, which limits the recycling of the catalyst

British "Journal of Materials Chemistry" in 2002, Volume 12, No. 5, Page 1391-1396 (T.Tsumura, N.Kojitani, I.Izumi, N.Iwashita, M.Toyoda, M.Inagaki, Carbon coating of anatase -type TiO 2 and photoactivity, Journal of Material Chemistry, 2002, 12 (5): 1391-1396) reported a method of coating nano-titanium dioxide particles with porous carbon materials to obtain a core-shell composite photocatalyst, although this method can effectively enhance the performance of titanium dioxide adsorption capacity, but usually requires high-temperature carbonization of the precursor, and the steps are cumbersome and harsh

Images