Carbon quantum dot and titanium codoped mesoporous silica composite photocatalyst

Abstract

The invention relates to a carbon quantum dot and titanium codoped mesoporous silica composite photocatalyst and a preparation method thereof. The method is mainly characterized by comprising the following steps: simultaneously introducing carbon quantum dots and a titanium source in the process of synthesizing an ordered mesoporous silica material by using an in-site loading method, removing a template agent by using a solvent extraction method, and subjecting the carbon quantum dots to crystallization with the manner of calcination in an inert atmosphere so as to obtain the carbon quantum dot and titanium codoped composite photocatalyst. Compared with the prior art, the method provided by the invention has the following advantages: simplicity, convenience, easy operation, and highly-efficient utilization of raw materials are realized; meanwhile, the carbon quantum dots and the titanium can be codoped into pore walls of a mesoporous material, and synergistic effects are generated in the pore walls, so improvement of photocatalytic activity is promoted; meanwhile, ordered mesoporous channels also provide good channels for diffusion and transmission of guest molecules, so the prepared photocatalyst has good catalytic degradation activity to organic pollutants like acid orange 7 (AO7) and 2,4-dichlorophenol (2,4-DCP).

Description

technical field

[0001] The invention relates to a photocatalytic material which can be used for degrading pollutants in water, and belongs to the technical field of photocatalysis. Background technique

[0002] Mesoporous silica is a new type of nano-material developed in recent years, it has up to 1000m 2 / g specific surface area, continuously adjustable pore size and highly long-range ordered channels, high thermal stability, etc. These excellent structural properties make them have great application value in catalysis, drug loading, exhaust gas adsorption, separation and purification, and solar photoelectric conversion. Once reported, they have attracted extensive attention in various related fields. Especially in recent years, with the continuous innovation of synthesis technology, various structures such as KIT, MSU and SBA mesoporous silica have been reported continuously, and the research on mesoporous materials has shown a booming scene. The research on the mechani...

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