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
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[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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