Black-phosphorus quantum-dot photocatalyst with adjustable band gaps, preparation method and application thereof

Abstract

The invention provides a black-phosphorus quantum-dot photocatalyst with adjustable band gaps, a preparation method and application thereof. The black-phosphorus quantum-dot photocatalyst is prepared by a simple heating reaction method, the sizes and the band gaps of black-phosphorus quantum dots are regulated and controlled by changing a reaction solvent, and further the photocatalytic property of the black-phosphorus quantum-dot photocatalyst is enhanced. The researched black-phosphorus quantum dots can be effectively applied in organic pollutants such as photocatalytic-degradation rhodamine B and the like. The black-phosphorus quantum-dot photocatalyst has the advantages of no pollution, low cost, stability and simple preparation process and the like.

Description

technical field

[0001] The invention belongs to the field of environment-friendly materials, and in particular relates to a black phosphorus quantum dot photocatalyst with adjustable band gap, its preparation method and application. Background technique

[0002] The rapid development of the global economy has led to serious environmental pollution problems, and environmental pollution has also become a serious challenge to the sustainable development of society. In recent years, water pollution with organic matter as pollutants has become increasingly serious, and the development of low-cost, green treatment methods has become a huge challenge for the development of human society. Photocatalytic degradation of organic pollutants, using abundant solar energy as the driving force to decompose organic matter on the surface of photocatalysts, is one of the most ideal ways to treat organic pollutants in water.

[0003] In the field of photocatalytic degradation of organic pollut...

Examples

Embodiment 1-1

[0025] Add 10mg of black phosphorus crystal powder to 100ml of N-methylpyrrolidone-oleic acid (v / v, 3 / 2) mixed solution, and react at 150℃ for 6h after ultrasonication for 20 minutes. After the reaction solution was cooled to room temperature, the unreacted black phosphorus powder was removed by centrifugation at 7000 rpm / min, and the centrifuged solution was collected to obtain a brown black phosphorus quantum dot solution. The average size of black phosphorus quantum dots is 2.9nm, such as figure 1 shown. Black phosphorus quantum dots have strong absorption in visible light, and emit blue light when excited at 345nm, such as figure 2 shown.

Embodiment 1-2

[0027] Add 10mg of black phosphorus crystal powder to 100ml of N-methylpyrrolidone solution, and react at 150℃ for 6h after ultrasonication for 20 minutes. After the reaction solution was cooled to room temperature, the unreacted black phosphorus powder was removed by centrifugation at 7000 rpm / min, and the centrifuged solution was collected to obtain a green black phosphorus quantum dot solution. The average size of black phosphorus quantum dots is 2.2nm, such as figure 1 shown. Black phosphorus quantum dots have weak absorption in visible light, and emit green light when excited at 345nm, such as figure 2 shown.

Embodiment 1

[0028] Examples 1-3 to 1-10 As shown in Table 1, black phosphorus quantum dot catalysts with different sizes and band gaps were prepared on the basis of changing the solvent, heating temperature, and reaction time of Example 1.

[0029] Table 1

[0030]

[0031]

technical field

[0001] The invention belongs to the field of environment-friendly materials, and in particular relates to a black phosphorus quantum dot photocatalyst with adjustable band gap, its preparation method and application. Background technique

[0002] The rapid development of the global economy has led to serious environmental pollution problems, and environmental pollution has also become a serious challenge to the sustainable development of society. In recent years, water pollution with organic matter as pollutants has become increasingly serious, and the development of low-cost, green treatment methods has become a huge challenge for the development of human society. Photocatalytic degradation of organic pollutants, using abundant solar energy as the driving force to decompose organic matter on the surface of photocatalysts, is one of the most ideal ways to treat organic pollutants in water.

[0003] In the field of photocatalytic degradation of organic pollut...

Examples

Embodiment 1-1

[0025] Add 10mg of black phosphorus crystal powder to 100ml of N-methylpyrrolidone-oleic acid (v / v, 3 / 2) mixed solution, and react at 150℃ for 6h after ultrasonication for 20 minutes. After the reaction solution was cooled to room temperature, the unreacted black phosphorus powder was removed by centrifugation at 7000 rpm / min, and the centrifuged solution was collected to obtain a brown black phosphorus quantum dot solution. The average size of black phosphorus quantum dots is 2.9nm, such as figure 1 shown. Black phosphorus quantum dots have strong absorption in visible light, and emit blue light when excited at 345nm, such as figure 2 shown.

Embodiment 1-2

[0027] Add 10mg of black phosphorus crystal powder to 100ml of N-methylpyrrolidone solution, and react at 150℃ for 6h after ultrasonication for 20 minutes. After the reaction solution was cooled to room temperature, the unreacted black phosphorus powder was removed by centrifugation at 7000 rpm / min, and the centrifuged solution was collected to obtain a green black phosphorus quantum dot solution. The average size of black phosphorus quantum dots is 2.2nm, such as figure 1 shown. Black phosphorus quantum dots have weak absorption in visible light, and emit green light when excited at 345nm, such as figure 2 shown.

Embodiment 1

[0028] Examples 1-3 to 1-10 As shown in Table 1, black phosphorus quantum dot catalysts with different sizes and band gaps were prepared on the basis of changing the solvent, heating temperature, and reaction time of Example 1.

[0029] Table 1

[0030]

[0031]

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