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Biochar-based supramolecular self-assembled carbon nitride composite photocatalytic material as well as preparation method and application thereof

A technology of supramolecular self-assembly and composite photocatalysis, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, water pollutants, etc., to achieve effective recycling, high photon quantum efficiency, and narrow bandgap width

Pending Publication Date: 2021-07-09
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a carbon material, biochar has a large specific surface area and good photoelectric properties, and there are few reports on the composite of biochar and carbon nitride materials.

Method used

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  • Biochar-based supramolecular self-assembled carbon nitride composite photocatalytic material as well as preparation method and application thereof
  • Biochar-based supramolecular self-assembled carbon nitride composite photocatalytic material as well as preparation method and application thereof
  • Biochar-based supramolecular self-assembled carbon nitride composite photocatalytic material as well as preparation method and application thereof

Examples

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preparation example Construction

[0034] The invention provides a biochar-based supramolecular self-assembled carbon nitride composite photocatalytic material, preparation method and application. The composite photocatalytic material is mainly made of alkali-modified biomass charcoal and supramolecular self-assembled carbon nitride, wherein , the self-assembled carbon nitride is made from melamine and cyanuric acid.

[0035] As a carbon-based raw material, biochar has a large specific surface area that can effectively increase the transmission distance of photoelectric charges of carbon nitride semiconductor materials, thereby reducing its recombination rate and improving its photocatalytic degradation activity; on the other hand, biochar has a larger The specific surface area provides more active sites for the adsorption of organic pollutants, and the effective contact between biochar and pollutants is a powerful guarantee for further photocatalytic decomposition of pollutants. The invention can effectively i...

Embodiment 1

[0050] This example provides a method for preparing a KOH-modified sunflower stalk biochar-based supramolecular self-assembled carbon nitride composite photocatalytic material, such as figure 1 Shown is the schematic diagram of the preparation process of this embodiment, and the preparation method includes steps:

[0051] (1) Preparation of KOH modified sunflower straw biochar:

[0052] Weigh 3g of KOH and dissolve it in deionized water, then add 30g of sunflower stalk powder, stir evenly, place in a constant temperature water bath at 98°C and evaporate to dryness to obtain a dark brown gel-like solid substance, and then put it in an oven to continue Dry for 24 hours, take it out, cool to room temperature and grind thoroughly to obtain a mixture of KOH and biomass powder. Weigh a certain amount of the mixture and put it into a corundum crucible with a cover weighed in advance, put it into a tubular heating furnace, and raise the temperature from room temperature to 500°C at a...

Embodiment 2

[0062] This example provides a KOH-modified sunflower stalk biochar-based supramolecular self-assembled carbon nitride composite photocatalytic material. and cyanuric acid (C3H3N3O3) powder were dissolved in water.

[0063] The light yellow powder obtained in step (2) is the supramolecular self-assembled g-C3N4 material, marked as g-C3N4-H, Figure 3d The SEM image of g-C3N4-H is shown. g-C3N4-H is closely stacked by flat nano-sheets, showing small blocks and needle-like structures of different sizes.

[0064] The composite photocatalytic material obtained in this embodiment is marked as A-BC / g-C3N4-H, Figure 3g The SEM image of A-BC / g-C3N4-H is shown. In the A-BC / g-C3N4-H composite material, after the mixture of A-BC and g-C3N4-H is heated in a constant temperature water bath and calcined at a high temperature again, the original structure is deformed to a large extent, A The relatively smooth surface of -BC with rich pore structure disappeared, but its rough edge struct...

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Abstract

The invention discloses a charcoal-based supramolecular self-assembled carbon nitride composite photocatalytic material, which is mainly prepared from alkali modified biomass charcoal and supramolecular self-assembled carbon nitride, and the self-assembled carbon nitride is prepared from melamine and cyanuric acid. The invention further discloses a preparation method and application of the composite photocatalytic material. The specific surface area and the physical and chemical properties of the biomass charcoal can be effectively improved through alkali modification, the morphology of g-C3N4 is regulated and controlled through a supramolecular self-assembly method, the g-C3N4 has the large specific surface area, the high light quantum efficiency and the narrow band gap width, and the photocatalytic performance of the g-C3N4 material is effectively improved to a certain degree; and on the other hand, the alkali-modified biomass charcoal and a carbon nitride material are compounded, so that effective recycling of agricultural resource wastes is effectively realized, the atmospheric pollution problem caused by straw incineration is relieved, the separation efficiency and mass transfer rate of g-C3N4 photo-induced electron holes are effectively improved, and the photocatalytic performance of the material is further enhanced.

Description

technical field [0001] The invention relates to the technical field of carbon materials and photocatalytic materials, in particular to a biochar-based supramolecular self-assembled carbon nitride composite photocatalytic material, a preparation method and an application. Background technique [0002] High-efficiency selective photocatalytic oxidation technology, as an environmentally friendly technology with broad application prospects, provides strong scientific support for the sustainable use of energy and the restoration of the ecological environment, and the development and preparation of new photocatalysts is an important primary guarantee. Graphite phase carbon nitride (g-C3N4), as a polymer semiconductor material, has high thermal and chemical stability, excellent photoelectric performance and suitable redox potential. However, single g-C3N4 still has many defects such as easy recombination of photogenerated carriers, low photon quantum efficiency, small specific sur...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F1/70C02F1/72C02F101/30C02F101/32
CPCB01J27/24C02F1/30C02F1/725C02F1/70C02F2101/32C02F2101/30C02F2305/10B01J35/39
Inventor 李法云吝美霞程文远王玮周纯亮
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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