Nano gold-mesoporous silica composite nanotube, preparation and applications thereof

Abstract

For the first time, a nano gold-mesoporous silica composite nanotube is prepared by taking aniline oligomer organic nano wires as the template. The nanotube has a large specific area (the BET specific surface area can reach 469 m2 / g) and mesoporous channels (3.7 nm). The size (5 to 20 nm) and load capacity (1 to 5 wt%) of nano gold catalyst can be simply and effectively controlled, and the shortages such as shedding of catalyst, growth of crystal grains, and the like are overcome. The nanotube can be used as a catalyst for the degradation of nitrophenol dyes and the catalytic activity is high. When the concentration of nitrophenol in water is 1 mM, 1 mg of Au-mSiO2 composite nanotube is taken as the catalyst, more than 95% of degradation is completed within one hour, and the degradation rate constant (k) can reach 0.045 min<-1>. The nanotube can be repeatedly used for three times, while the catalytic performance is not degraded. Moreover, the preparation method is simple and feasible, the reactions can be carried out in a water phase environment at a room temperature, and thus the preparation method is environment-friendly and energy-saving.

Description

technical field [0001] The invention discloses a method for preparing nano-gold-mesoporous silicon dioxide composite nanotubes by using aniline oligomer organic nanowires as templates, and using the method to efficiently catalyze the degradation reaction of p-nitrophenol dyes. Background technique [0002] Metal nanoparticle catalysts (Au, Ag, Pd, Pt, etc.) are expensive. In order to improve catalytic efficiency, reduce costs, and avoid agglomeration, it is usually necessary to load the catalyst on a carrier material. At present, there are many catalyst supports at home and abroad: silica gel, molecular sieve, aluminum silicate, Al 2 o 3 , diatomaceous earth, ion exchange resin, bentonite, activated carbon, etc. Among them, mesoporous SiO 2 The material has the advantages of cheap price, large specific surface area, strong adsorption capacity, controllable pore size, and easy functional modification of the surface. play an important role. However, the catalyst is prone ...

AI Technical Summary

Problems solved by technology

The present invention also provides a simple and effective method for solving the problems of "easy shedding and loss, enlarged crystal grain growth, difficult control of dispersibility and loading capacity" of metal catalysts in the process of loading treatment and subsequent reaction catalysis

Images