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Graphite-phase carbon nitride material for catalytic reduction of p-nitrophenol as well as preparation method and application of graphite-phase carbon nitride material

A technology of graphite phase carbon nitride and p-nitrophenol, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of high catalyst cost and unsuitability for large-scale production, and achieve Conducive to adsorption, multiple active sites, and increased specific surface area

Pending Publication Date: 2020-02-07
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This also has the problem that the cost of the catalyst is high and it is not suitable for large-scale production; therefore, it will be a very meaningful work to find a catalyst that is more economical and environmentally friendly.

Method used

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  • Graphite-phase carbon nitride material for catalytic reduction of p-nitrophenol as well as preparation method and application of graphite-phase carbon nitride material
  • Graphite-phase carbon nitride material for catalytic reduction of p-nitrophenol as well as preparation method and application of graphite-phase carbon nitride material
  • Graphite-phase carbon nitride material for catalytic reduction of p-nitrophenol as well as preparation method and application of graphite-phase carbon nitride material

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preparation example Construction

[0021] The preparation steps of graphite phase carbon nitride of the present invention and catalytic reduction process are as follows:

[0022] In the first step, dicyandiamide is dissolved in deionized water, heated and stirred at 40-45 °C for 30-60 min;

[0023] In the second step, slowly drop concentrated nitric acid with a volume ratio of 1:5 to 8 into the solution of the first step, and stir for 120-180 min;

[0024] In the third step, the reaction solution in the second step is cooled and crystallized in a mixed solution of ice and water, dried at 50-60° C., and dried to obtain amidinourea nitrate;

[0025] The fourth step is to roast the amidinourea nitrate obtained in the third step at 550±10° C. for 2-4 h to prepare graphite phase carbon nitride;

[0026] The fifth step, weigh an appropriate amount of graphite phase carbon nitride in the catalytic tube, add p-nitrophenol ( p- NP) and reducing agent sodium borohydride (NaBH 4 ), the reaction was carried out at room ...

Embodiment 1

[0029] In the first step, 2 g of dicyandiamide was dissolved in 40 mL of deionized water, heated and stirred at 40°C for 60 min;

[0030] In the second step, slowly drop concentrated nitric acid (5mL) with a volume ratio of 1:8 into the solution of the first step, and stir for 120 min;

[0031] In the third step, the reaction solution in the second step is cooled and crystallized in a mixed solution of ice and water, dried at 60° C., and dried to obtain amidinourea nitrate;

[0032] In the fourth step, calcining the amidinourea nitrate obtained in the third step at 550±10°C for 4 h to obtain graphitic carbon nitride 5H-CN;

[0033] The fifth step, weigh 1 mg 5H-CN in the catalytic tube, add 25mLH 2 O. 25mL p- NP (20mg / L)

[0034] and 25 mg NaBH 4 , react at room temperature.

[0035] The prepared 5H-CN, its field emission scanning electron microscope and transmission electron microscope such as figure 2 As shown, BET as image 3 shown.

[0036] Catalytic reduction of ...

Embodiment example 2

[0038] In the first step, 2 g of dicyandiamide was dissolved in 40 mL of deionized water, heated and stirred at 45 °C for 30 min;

[0039] In the second step, slowly drop concentrated nitric acid (8 mL) with a volume ratio of 1:5 into the solution of the first step, and stir for 180 min;

[0040] In the third step, the reaction solution in the second step is cooled and crystallized in the ice-water mixture, and dried at 50°C;

[0041] In the fourth step, the amidinourea nitrate obtained in the third step was calcined at 550 °C for 2 h to prepare graphitic carbon nitride 8H-CN.

[0042] The fifth step, weigh 1 mg8H-CN in the catalytic tube, add 25mLH 2 O. 25mL p- NP (20mg / L)

[0043] and 25 mg NaBH 4 , react at room temperature.

[0044] The result is as Figure 4 Shown, room temperature catalytic reduction p- After 14 min of reaction, the reduction rate of NP reached 90.8%.

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Abstract

The invention discloses a graphite-phase carbon nitride material for catalytic reduction of p-nitrophenol as well as a preparation method and application of the graphite-phase carbon nitride material.The preparation method comprises the following steps: dissolving dicyandiamide in water, and performing heating and stirring to dissolve the dicyandiamide; slowly dropwise adding concentrated nitricacid in a volume ratio of the concentrated nitric acid to the water of 1:(5-8) into the solution, and performing stirring for 120-180 minutes; and performing cooling and crystallizing in an ice-watermixed solution, and performing drying so as to obtain amidinourea nitrate; and performing roasting for 2-4 hours at 550+ / -10 DEG C, so as to prepare graphite-phase carbon nitride with a porous twistedstructure. The graphite-phase carbon nitride material is used as a catalyst for organic catalysis; the catalyst has excellent performance in the aspect of catalytic reduction of p-nitrophenol; when the feeding volume ratio of the concentrated nitric acid to the water is 1:8, the prepared graphite-phase carbon nitride material is used for catalytic reduction of o-nitrophenol (o-NP), m-nitrophenol(m-NP) and p-nitrophenol (p-NP), the reduction rates are 98.2%, 99.0% and 99.6% respectively, and the graphite-phase carbon nitride material has an obvious and excellent catalytic reduction effect.

Description

technical field [0001] The invention relates to a graphite-phase carbon nitride and an application thereof, belonging to the field of nanometer material preparation. Background technique [0002] Nitrophenol (Nitrophenol) is an organic substance widely used in industrial production. Nitrophenol contained in the environment is usually mainly from organic synthesis, dye manufacturing, and explosives production. Since nitrophenols are extremely toxic, their content in natural water bodies is also required to be less than 10 mg L -1 , and 2-nitrophenol ( o -NP), 4-nitrophenol ( p -NP), 2,4-dinitrophenol (2,4-DNT) have been listed as priority hazardous pollutants by the US Environmental Protection Agency. Therefore, how to effectively treat nitrophenol wastewater is a problem of great significance. Aminophenol, the reduction product of nitrophenol, is a kind of fine organic chemical intermediate widely used in our country at present, and has important application significance...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/34C02F101/38
CPCB01J27/24C02F1/30C02F2101/345C02F2101/38B01J35/39
Inventor 付永胜黄婷汪信朱俊武彭琼向忆南黄夏露刘冰倩
Owner NANJING UNIV OF SCI & TECH
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