Bismuth tungstate composite photocatalyst modified by nitrogen-doped carbon quantum dot and preparation method and application thereof

Abstract

The invention discloses a bismuth tungstate composite photocatalyst modified by a nitrogen-doped carbon quantum dot and a preparation method and application thereof. The composite photocatalyst is characterized in that bismuth tungstate is taken as a carrier, and is modified with the nitrogen-doped carbon quantum dot. The preparation method comprises the following steps: mixing bismuth nitrate, sodium tungstate and water, and stirring the mixture to obtain a bismuth tungstate precursor solution; mixing the bismuth tungstate precursor solution with a nitrogen-doped carbon quantum dot solution, and stirring the mixture to obtain a mixed solution; performing a hydrothermal reaction to obtain the bismuth tungstate composite photocatalyst. The composite photocatalyst has the advantages of environmental friendliness, high photo-induced electron-hole separating efficiency, high light absorbing efficiency, high photocatalysis activity, high photocatalysis stability and high corrosion resistance; the preparation method has the advantages of simple preparation process, low raw material cost, and easiness in controlling operation conditions. The composite photocatalyst is used for catalyzing degradation of antibiotic wastewater, and has the advantages of simple application method, high degrading efficiency and high repeatability, and has a very good practical application prospect.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis and relates to a bismuth tungstate composite photocatalyst and its preparation method and application, in particular to a nitrogen-doped carbon quantum dot modified bismuth tungstate composite photocatalyst and its preparation method and application. Background technique [0002] With the development of modern industry, the problems of energy crisis and environmental pollution are becoming more and more serious. Among them, energy shortage and environmental degradation are major problems that human beings face in the 21st century and need to be solved urgently. Therefore, new energy utilization and environmental pollution control are of great significance to the national sustainable development strategy. Due to its low cost, no pollution and high efficiency, photocatalytic technology has broad application prospects in energy storage, conversion and environmental protection. [0003] Bismut...

AI Technical Summary

Problems solved by technology

However, these traditional modification methods usually use larger-sized materials to modify bismuth tungstate. Due to the large size of the modified material, the combination of the modified material and bismuth tungstate is not complete, thus forming on the surface of the composite photocatalyst. The existence of these surface defects will make the photogenerated electron-hole pairs in the composite photocatalyst recombine more easily, which severely limits the photocatalytic performance of the composite photocatalyst.

Therefore, how to comprehensively improve the fast recombination rate of bismuth tungstate photogenerated electron-hole pairs, low light absorption efficiency, poor photocatalytic activity, and poor stability of photocatalytic performance is a technical problem that needs to be solved urgently in this field, and to obtain a green and environmentally friendly , nitrogen-doped carbon quantum dots modified bismuth tungstate composite photocatalyst with high photogenerated electron-hole separation efficiency, high light absorption efficiency, high photocatalytic activity, good photocatalytic performance stability, and strong corrosion resistance, which can promote tungstic acid It is of great significance for bismuth materials to go to a wide range of practical applications

Images