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Preparation method and application of nitrogen defect/boron doped tubular carbon nitride photocatalyst

A boron doping and catalyst technology is applied in the field of preparation of tubular carbon nitride photocatalysts, which can solve the problems of weak oxidation performance, inability to obtain catalytic effect, insufficient light absorption performance, etc., achieve large interlayer distance, and improve photocatalytic oxidation. performance, and the effect of enhancing the hydrogen production activity of decomposing water

Inactive Publication Date: 2021-08-31
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, tubular carbon nitride has insufficient light absorption performance and weak oxidation performance below 600 nm, and cannot obtain good catalytic effect.

Method used

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  • Preparation method and application of nitrogen defect/boron doped tubular carbon nitride photocatalyst
  • Preparation method and application of nitrogen defect/boron doped tubular carbon nitride photocatalyst
  • Preparation method and application of nitrogen defect/boron doped tubular carbon nitride photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of TCN photocatalyst:

[0038] Weigh 3 g of melamine and 0.5 g of phosphoric acid into 70 mL of deionized water and stir vigorously for 0.5 h; then transfer the solution to a 100 mL autoclave and react at 190 °C for 8 h; wash the resulting supramolecular precursor with deionized water until Phosphoric acid was thoroughly washed and then dried at 60°C. Finally, the obtained supramolecular precursor was heated to 500°C at a heating rate of 2.3°C / min in a muffle furnace, and calcined for 4 hours to obtain TCN;

[0039] (2) Preparation of D-TCN photocatalyst:

[0040] 0.2g TCN and 160mg NaBH 4 After mixing and grinding evenly, put it in a corundum porcelain boat, cover the porcelain boat cover, keep the porcelain boat in a semi-closed state, and place it in a tube furnace. Under a nitrogen atmosphere, raise the temperature to 450 ℃, the heating rate is 2.3°C / min, the calcination time is 0.5h, after the calcination is finished, it is naturally cooled to ro...

Embodiment 2

[0042] (1) Preparation of TCN photocatalyst:

[0043]Weigh 4 g of melamine and 1 g of phosphoric acid into 70 mL of deionized water and stir vigorously for 0.5 h; then transfer the solution to a 100 mL autoclave and react at 200 °C for 12 h; wash the resulting supramolecular precursor with deionized water until phosphoric acid was thoroughly washed and then dried at 60°C. Finally, the obtained supramolecular precursor was heated to 500°C at a heating rate of 2.3°C / min in a muffle furnace, and calcined for 4 hours to obtain TCN;

[0044] (2) Preparation of D-TCN photocatalyst:

[0045] 0.4g TCN and 80mg NaBH 4 After mixing and grinding evenly, put it in a corundum porcelain boat, cover the porcelain boat cover, keep the porcelain boat in a semi-closed state, and place it in a tube furnace. Under a nitrogen atmosphere, raise the temperature to 450 °C, the heating rate is 2.3 °C / min, and the calcination time is 0.5 h. After the calcination, it is naturally cooled to room tempe...

Embodiment 3

[0047] (1) Preparation of TCN photocatalyst:

[0048] Weigh 5 g of melamine and 2 g of phosphoric acid into 70 mL of deionized water and stir vigorously for 0.5 h; then transfer the solution to a 100 mL autoclave and react at 180 °C for 10 h; wash the resulting supramolecular precursor with deionized water until phosphoric acid It was completely washed, and then dried at 60°C; finally, the obtained supramolecular precursor was heated to 500°C in a muffle furnace at a heating rate of 2.3°C / min, and calcined for 4 hours to obtain TCN;

[0049] (2) Preparation of D-TCN photocatalyst:

[0050] 0.6g TCN and 40mg NaBH 4 After mixing and grinding evenly, place it in a corundum porcelain boat, cover the porcelain boat cover, keep the porcelain boat in a semi-closed state, and place it in a tube furnace, and raise the temperature to 450°C at a heating rate of 2.3°C / min under a nitrogen atmosphere , the heating rate is 2.3°C / min, and the calcination time is 0.5h. After the calcination...

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Abstract

The invention belongs to the technical field of semiconductor photocatalysts, and particularly relates to a preparation method and application of a nitrogen defect / boron doped tubular carbon nitride photocatalyst. The preparation method comprises the following steps: putting melamine and phosphoric acid into a high-pressure kettle containing deionized water to carry out hydrothermal reaction, washing the reacted product with deionized water, carrying out vacuum drying to obtain a substance which is a supramolecular precursor, conducting calcining again, naturally conducting cooling and conducting grinding to obtain tubular carbon nitride; mixing tubular carbon nitride and NaBH4, then conducting uniform grinding, and putting the mixture into a porcelain boat for calcination; and washing the calcined product with HCl and distilled water, and carrying out vacuum drying to obtain the nitrogen defect / boron doped tubular carbon nitride photocatalyst, which is marked as a D-TCN photocatalyst. The synergistic effect of nitrogen defect / boron doping and the tubular structure can effectively promote light capture, accelerate charge transfer and promote exposure of more active sites, and the effects of photocatalytic degradation of antibiotics and decomposition of water to produce hydrogen activity can be remarkably enhanced.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalysts, and in particular relates to a preparation method and application of a nitrogen-deficient / boron-doped tubular carbon nitride photocatalyst. Background technique [0002] Solar-driven photocatalytic degradation of water pollutants and water splitting to produce hydrogen are of great significance for solving my country's environmental and energy problems. The criticality and feasibility of this technology largely depends on the development of cheap, environmentally friendly, and efficient semiconductor materials. Among various photocatalysts, the polymer carbon nitride (g-C 3 N 4 ) as a nonmetal semiconductor nanomaterial has received special attention due to its facile synthesis, environmental friendliness, and chemical stability. However g-C 3 N 4 The overall structure contains limited active sites, low absorbance, and poor charge separation and transfer efficiency, resu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01J37/10B01J37/16C01B3/04C02F1/30C02F1/72C02F101/34C02F101/38
CPCB01J27/24B01J37/10B01J37/082B01J37/16C02F1/30C02F1/725C01B3/042C02F2305/10C02F2101/34C02F2101/38B01J35/39Y02E60/36
Inventor 王帅军陈林贺凤婷李斌王军锋赵朝成
Owner JIANGSU UNIV
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