Modified carbon quantum dot loaded hollow tubular carbon nitride photocatalyst and preparation method thereof

Abstract

The invention discloses a modified carbon quantum dot loaded hollow tubular carbon nitride photocatalyst and a preparation method thereof. The photocatalyst takes hollow tubular carbon nitride as a carrier and is loaded with modified carbon quantum dots; urea and melamine with a mole ratio of 1-5:1 are used to prepare the hollow tubular carbon nitride through hydrothermal and calcination. The preparation method comprises the following steps of: mixing hollow tubular carbon nitride, water and modified carbon quantum dot solution, and drying to obtain the photocatalyst. The photocatalyst has the advantages of large specific surface area, large number of pores, multiple active sites, high speed of separation and migration of photo-generated carriers, strong light absorption capacity, high photocatalytic activity, high stability, high photocatalytic efficiency and the like; the preparation method of the photocatalyst has the advantages of convenience in synthesis, simplicity in operation,no secondary pollution to the environment and the like. The photocatalyst can be widely used for treating organic pollutants in the environment and killing harmful microorganisms in the environment,and has good application value and application prospect.

Description

technical field [0001] The invention belongs to the field of visible light catalysis, and relates to a hollow tubular carbon nitride photocatalyst supported by modified carbon quantum dots and a preparation method thereof. Background technique [0002] Graphite carbon nitride (g-C 3 N 4 ), as a conjugated polymer semiconductor, has attracted considerable attention recently because of its good physicochemical stability, attractive electronic structure and appropriate bandgap, i.e. 2.7eV, which is promising in catalysis and energy Good application prospects. However, it also has inherent problems such as small specific surface area, high exciton binding energy, and serious photogenerated electron-hole recombination, resulting in low photocatalytic efficiency, which seriously restricts its practical application and promotion in the field of energy and environmental photocatalysis. The nanostructure of photocatalysts is closely related to their physical and chemical propertie...

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Problems solved by technology

However, the existing carbon nitride photocatalysts with different morphologies still have disadvantages such as small specific surface area, few active sites, serious recombination of photogenerated carriers, poor light absorption ability, and low photocatalytic activity.

In addition, most of the existing carbon nitride photocatalyst preparation processes are template methods, and templates need to be removed during their synthesis, which is not conducive to improving the preparation efficiency, and leads to complex preparation processes, high preparation costs, and time-consuming At the same time, these synthesis processes require extensive use of various organic material additives or high-pressure conditions, where organic additives are usually difficult to completely remove, and their residual amount will not only affect the photocatalytic performance of carbon nitride photocatalysts, but these organic additives may also It has adverse effects on the environment, and the existence of these problems severely limits the wide application of carbon nitride photocatalysts.

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