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CN-121972203-A - Nano composite photocatalytic material and preparation method and application thereof

CN121972203ACN 121972203 ACN121972203 ACN 121972203ACN-121972203-A

Abstract

The invention discloses a nano composite photocatalytic material and a preparation method and application thereof, wherein the preparation method comprises the steps of adding porous carbon nitride into deionized water, stirring, adding silver nitrate solution, continuously stirring, dripping potassium bromide solution, stirring for a period of time, filtering, washing, roasting and grinding to obtain a composite material of porous carbon nitride and silver bromide nanoparticles, adding the composite material of porous carbon nitride and silver bromide nanoparticles into deionized water, stirring, adding rhenium disulfide quantum dot dispersion, continuously stirring, and freeze-drying and drying.

Inventors

  • HONG DUNHUA
  • ZHENG SHIHAN
  • HE JINGJING
  • ZHANG YUN
  • JIANG JINGHONG
  • LIU LAN
  • ZHU WEI
  • YUAN JIAXIN
  • WANG MINGJIANG
  • CHEN JIAYAN
  • LIU FEIYAN
  • LU XUAN

Assignees

  • 遵义师范学院

Dates

Publication Date
20260505
Application Date
20260211

Claims (10)

  1. 1. A preparation method of a nano composite photocatalytic material, which is characterized by comprising the following steps: (a) Grinding melamine, adding cyanuric acid, continuously grinding, adding absolute ethyl alcohol, stirring, performing ultrasonic treatment, and drying to obtain a precursor, grinding the precursor into powder, heating to 450-550 ℃, calcining, cooling, grinding into powder, and drying to obtain porous carbon nitride; (b) Adding porous carbon nitride into deionized water, stirring, adding silver nitrate solution, continuously stirring to obtain dispersion liquid, dropwise adding potassium bromide solution into the dispersion liquid, stirring for a period of time, filtering, washing, roasting and grinding to obtain a composite material of porous carbon nitride and silver bromide nano particles; (c) Grinding rhenium disulfide powder, adding N-methyl pyrrolidone, uniformly mixing to obtain a mixed solution, carrying out ultrasonic crushing treatment on the mixed solution, centrifuging, and collecting supernatant to obtain rhenium disulfide quantum dot dispersion liquid; (d) Adding the composite material of the porous carbon nitride and silver bromide nano particles into deionized water, stirring for a period of time, adding rhenium disulfide quantum dot dispersion liquid, continuously stirring for a period of time, and freeze-drying and drying to obtain the nano composite photocatalytic material.
  2. 2. The preparation method according to claim 1, wherein in the step (a), the mass ratio of melamine to cyanuric acid is (2-3) to 1.
  3. 3. The method according to claim 1, wherein in the step (a), the temperature rising rate is 1.8-2.2 ℃ per minute, and the calcination time is 4-6 hours.
  4. 4. The preparation method of claim 1, wherein in the step (b), the roasting temperature is 120-140 ℃ and the time is 18-25 h, and the mass content of silver bromide nanoparticles in the composite material of the porous carbon nitride and the silver bromide nanoparticles is 5-20%.
  5. 5. The method according to claim 1, wherein in the step (c), the ultrasonic power is 160-200W and the time is 8-12 h, and the centrifugation comprises centrifugation at 3500-4500 rpm for 15-25 min, collecting supernatant, and centrifugation at 12000-14000 rpm for 15-25 min.
  6. 6. The method according to claim 1, wherein in the step (d), the mass percentage of the rhenium disulfide quantum dots in the nanocomposite photocatalytic material is 1% -10%.
  7. 7. The nanocomposite photocatalytic material produced by the production method according to any one of claims 1 to 6.
  8. 8. The application of the nano composite photocatalytic material prepared by the preparation method of any one of claims 1-6 in photocatalytic degradation of organic matters.
  9. 9. The use of the nanocomposite photocatalytic material produced by the production method according to any one of claims 1 to 6 in sewage treatment.
  10. 10. The use of the nanocomposite photocatalytic material produced by the production method according to any one of claims 1 to 6 in photocatalytic hydrogen production.

Description

Nano composite photocatalytic material and preparation method and application thereof Technical Field The invention relates to the technical field of photocatalytic materials, in particular to a nano composite photocatalytic material and a preparation method and application thereof. Background Under the background of the introduction of a double-carbon target and the normalization of ecological environment protection, environmental pollution control and clean energy replacement have become core issues related to sustainable development of human beings. The problems of organic pollutant pollution caused by industrial wastewater discharge, greenhouse gas emission caused by traditional fossil energy consumption, resource exhaustion and the like form a vicious circle of pollution-energy consumption, and development of an integrated technology with pollution control and clean energy production capability is urgently needed. The photocatalysis technology can synchronously realize the degradation and mineralization of organic pollutants and the hydrogen production by water separation by virtue of the green characteristic of solar energy drive, does not need additional energy consumption and secondary pollution, becomes an ideal choice for breaking the dilemma, and has the core of developing a photocatalysis material with high-efficiency double-function catalytic activity, wide spectral response and long-cycle stability. Among the currently reported photocatalytic materials, graphite-phase carbon nitride (g-C 3N4) is favored in the field of photocatalysis due to the advantages of proper energy band structure (band gap of about 2.7 eV), good chemical stability, low cost, easiness in preparation and the like, but the pure-phase material has inherent defects of high photo-generated electron-hole recombination rate, limited specific surface area, insufficient visible light utilization rate and the like, and severely restricts the comprehensive efficiency in the fields of pollution control and hydrogen production. Although the traditional modification strategies such as single element doping, simple compounding and the like can improve the performance to a certain extent, the high-efficiency requirements of double-function catalysis are difficult to meet at the same time. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a nano composite photocatalytic material and a preparation method and application thereof, wherein the nano composite photocatalytic material of a porous carbon nitride (p-g-C 3N4) -based (ReS 2 QDs-AgBr NPs) @ PCN ternary heterostructure is constructed through thermal polycondensation, chemical precipitation, quantum dot introduction and other processes, the p-g-C 3N4 in the nano composite photocatalytic material provides stable substrate and basic catalytic activity, agBr widens the spectral response range, enhances pollutant adsorption degradation, reS 2 QDs optimizes charge transmission, improves hydrogen evolution kinetic efficiency, and the three synergistically realize high-efficiency conversion of solar energy-chemical energy and high-efficiency degradation of organic pollutants. In order to achieve the above object of the present invention, the following technical solutions are specifically adopted: the first aspect of the present invention provides a preparation method of a nanocomposite photocatalytic material, the preparation method comprising the steps of: (a) Grinding melamine, adding cyanuric acid, continuously grinding, adding absolute ethyl alcohol, stirring, performing ultrasonic treatment, and drying to obtain a precursor, grinding the precursor into powder, heating to 450-550 ℃, calcining, cooling, grinding into powder, and drying to obtain porous carbon nitride; (b) Adding porous carbon nitride into deionized water, stirring, adding silver nitrate solution, continuously stirring to obtain dispersion liquid, dropwise adding potassium bromide solution into the dispersion liquid, stirring for a period of time, filtering, washing, roasting and grinding to obtain a composite material of porous carbon nitride and silver bromide nano particles; (c) Grinding rhenium disulfide powder, adding N-methyl pyrrolidone, uniformly mixing to obtain a mixed solution, carrying out ultrasonic crushing treatment on the mixed solution, centrifuging, and collecting supernatant to obtain rhenium disulfide quantum dot dispersion liquid; (d) Adding the composite material of the porous carbon nitride and silver bromide nano particles into deionized water, stirring for a period of time, adding rhenium disulfide quantum dot dispersion liquid, continuously stirring for a period of time, and freeze-drying and drying to obtain the nano composite photocatalytic material. Preferably, in the step (a), the mass ratio of the melamine to the cyanuric acid is (2-3) to 1. Preferably, in the step (a), the temperature rising rate is 1.8-2.2 ℃ per minute, and the calci