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Oxygen-deficient titanium dioxide material compounded with hydroxylated carbon nitride and preparation method thereof

A technology for compounding hydroxylated carbon nitride and hydroxylated carbon nitride is applied in the field of photocatalysis, which can solve the problems of low quantum efficiency and achieve the effects of improving quantum efficiency, good stability and enhancing separation efficiency.

Pending Publication Date: 2020-12-18
HAINAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, simply combining two kinds of semiconductors still has the problem of low quantum efficiency in photocatalytic oxidation.

Method used

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  • Oxygen-deficient titanium dioxide material compounded with hydroxylated carbon nitride and preparation method thereof
  • Oxygen-deficient titanium dioxide material compounded with hydroxylated carbon nitride and preparation method thereof
  • Oxygen-deficient titanium dioxide material compounded with hydroxylated carbon nitride and preparation method thereof

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Embodiment 1

[0030] The preparation method of the oxygen-deficient titanium dioxide material composited with hydroxylated carbon nitride of the present invention comprises the following steps:

[0031] (1) Surface hydroxylation g-C 3 N 4 preparation of

[0032] Weigh 1.5g of melamine, 7.5g of potassium chloride and 0.1g of sodium hydroxide, mix them well and place them in a corundum crucible, cover them and place them in a muffle furnace, and calcinate at 550°C for 4h with a heating rate of 2.5°C / min . After cooling to room temperature naturally, take it out and grind it. Disperse the obtained powder in 100mL deionized water, stir for 6 hours, filter with suction, wash and dry at 80°C, and cool to obtain the surface hydroxylated g-C 3 N 4 sample. Samples are labeled CN-OH.

[0033] (2) CN-OH / oxygen-deficient TiO 2 Preparation of composite materials

[0034] Add 3 mL of titanium isopropoxide into 6 mL of absolute ethanol, mix well, and slowly add it dropwise into 40 mL of deionized...

Embodiment 2

[0036] The preparation method of the oxygen-deficient titanium dioxide material composited with hydroxylated carbon nitride of the present invention comprises the following steps:

[0037] (1) Surface hydroxylation g-C 3 N 4 preparation of

[0038] Weigh 1.5g of melamine, 7.5g of potassium chloride and 0.1g of sodium hydroxide, mix them thoroughly and place them in a corundum crucible, cover them and place them in a muffle furnace, and calcinate at 500°C for 5h with a heating rate of 3°C / min . After cooling to room temperature naturally, take it out and grind it. Disperse the obtained powder in 100mL deionized water, stir for 6 hours, filter with suction, wash and dry at 80°C, and cool to obtain the surface hydroxylated g-C 3 N 4 sample. Samples are labeled CN-OH.

[0039] (2) CN-OH / oxygen-deficient TiO 2 Preparation of composite materials

[0040] Add 3 mL of titanium isopropoxide into 6 mL of absolute ethanol, mix well, and slowly add it dropwise into 40 mL of deion...

Embodiment 3

[0042] The preparation method of the oxygen-deficient titanium dioxide material composited with hydroxylated carbon nitride of the present invention comprises the following steps:

[0043] (1) Surface hydroxylation g-C 3 N 4 preparation of

[0044] Weigh 1.5g of melamine, 7.5g of potassium chloride and 0.1g of sodium hydroxide, mix them well, place them in a corundum crucible, cover them and put them in a muffle furnace, and calcinate at 600°C for 2h, with a heating rate of 2°C / min . After cooling to room temperature naturally, take it out and grind it. Disperse the obtained powder in 100mL deionized water, stir for 6 hours, filter with suction, wash and dry at 80°C, and cool to obtain the surface hydroxylated g-C 3 N 4 sample. Samples are labeled CN-OH.

[0045] (2) CN-OH / oxygen-deficient TiO 2 Preparation of composite materials

[0046] Add 3 mL of titanium isopropoxide into 6 mL of absolute ethanol, mix well, and slowly add it dropwise into 40 mL of deionized water...

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Abstract

The invention belongs to the technical field of photocatalysis, and discloses an oxygen-deficient titanium dioxide material compounded with hydroxylated carbon nitride and a preparation method thereof, wherein the oxygen-deficient titanium dioxide material is obtained by compounding the hydroxylated carbon nitride and the oxygen-deficient titanium dioxide material; and the hydroxylated carbon nitride accounts for 10%-90% of the mass fraction of the composite material. The preparation method of an oxygen-deficient titanium dioxide material of composite hydroxylated carbon nitride comprises thefollowing steps: preparing surface hydroxylated carbon nitride (CN-OH), synthesizing titanium dioxide by using titanium isopropoxide as a titanium source through a hydrothermal method, fully mixing the hydroxylated carbon nitride (CN-OH) and titanium dioxide (TiO2), and calcining in an Ar / H2 mixed atmosphere to obtain the oxygen-deficient titanium dioxide material, wherein oxygen defects are introduced into a titanium dioxide phase through the process, thereby compounding of the two materials is achieved at the same time. The separation efficiency of photon-generated carriers is enhanced through effective combination of the two, the compounded CN-OH / Ov-TiO2 material has high light energy utilization rate and oxidability, and the quantum efficiency of photocatalytic degradation of phenol can be further improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a composite photocatalytic material and a preparation method, in particular to a hydroxylated carbon nitride and oxygen-deficient titanium dioxide composite material and a preparation method. Background technique [0002] Phenols and phenolic compounds are important raw materials in the chemical industry, and water pollution is becoming more and more serious due to their excessive use and lack of timely treatment. Phenol-containing wastewater has a large quantity and a wide range of sources, which indirectly endangers the growth and reproduction of aquatic animals and plants and human health. Therefore, it is of great significance to purify and treat phenolic wastewater. At present, the main treatment methods include physical methods such as adsorption and extraction; chemical methods such as oxidation and biological methods such as biofilm. Among them, the photocatalytic ...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/08B01J37/10C02F1/30C02F1/72C02F101/34
CPCB01J27/24B01J37/08B01J37/10C02F1/30C02F1/725C02F2305/10C02F2101/345B01J35/39
Inventor 马健华英杰王崇太
Owner HAINAN NORMAL UNIV
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