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Method for reducing carbon dioxide through inorganic semiconductor photocatalysis system

An inorganic semiconductor and carbon dioxide technology, which is applied in the preparation of carbon dioxide reduction method, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as excessively wide band gap, and achieve the effects of simple composition, high utilization rate of visible light, and simple operation.

Inactive Publication Date: 2016-10-05
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most semiconductor materials have the disadvantage of excessively wide band gap and can only be excited by ultraviolet light, which only accounts for ~4% of the energy of sunlight.

Method used

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  • Method for reducing carbon dioxide through inorganic semiconductor photocatalysis system
  • Method for reducing carbon dioxide through inorganic semiconductor photocatalysis system
  • Method for reducing carbon dioxide through inorganic semiconductor photocatalysis system

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Embodiment 1: the aqueous phase preparation of CdSe quantum dot

[0064] The experimental steps include: ① preparation of Na 2 SeSO 3 : First weigh 40.0mg selenium powder (0.5mmol) and add to 100mL Na 2 SO 3 (189 mg) in aqueous solution, degassed for 30 minutes. Heat to reflux until the selenium powder is completely dissolved to obtain clear and transparent Na 2 SeSO 3 Solution, stored away from light under an inert atmosphere; ②Synthesis of water-soluble CdSe quantum dots: add 46mg CdCl to a 500mL single-necked round bottom flask 2 ·5 / 2H 2 O (0.2mmol), 190mL deionized water and 26μL mercaptopropionic acid (0.3mmol), adjust the pH value to 11.00 with 1.0mol / L NaOH, and pass argon for 30 minutes; then use a syringe to take 10mL of fresh Na 2 SeSO 3 The solution was quickly injected into the reaction solution of the single-necked flask, continued degassing for 20 minutes, and refluxed for 2.0-4.0h to obtain a yellow-green solution, and the synthesized CdSe quantum...

Embodiment 2

[0065] Embodiment 2: CdSe nanorod oil phase synthesis

[0066] Add 0.06g CdO, 0.28g octylated diphenylamine (abbreviation: ODPA) and 3g tri-n-octylphosphine oxide (abbreviation: TOPO) into a 25mL three-necked flask, heat to 300°C under argon atmosphere, and dissolve CdO into the solution Clear and transparent, inject 1.5g trioctylphosphine (abbreviation: TOP), the temperature rises to 350 ° C, inject the precursor of Se (0.058g Se+0.36g TOP), where [Cd]:[Se] (molar ratio) = 2:3, the reaction was stopped after 5s to obtain CdSe seeds with a diameter of about 2.6nm. CdSe nanorods can be obtained by changing the ratio of precursor, stabilizer and temperature, figure 2 Electron micrographs of CdSe nanorods synthesized in oil phase.

Embodiment 3

[0067] Embodiment 3: the aqueous phase synthesis of CdTe quantum dot

[0068] ① Synthesis of NaHTe: Put a small magnet in a 3.0mL glass bottle, adjust the rotation speed so that it just rotates. Prepare an ice bath, weigh 100mg NaBH 4 Add to the glass bottle, add 1.0 mL of pre-cooled distilled water, seal it with a parafilm, make a small hole, stir until clear, add 127 mg of Te powder, ice bath, and stir for 4.0 h. ②Synthesis of CdTe quantum dots: add 46mg CdCl to a 250mL round bottom flask 2 ·5 / 2H 2 O, 200mL deionized water and 26μL mercaptopropionic acid, stirred; then adjust the pH value to 11.2 with 1.0M sodium hydroxide, and flow argon for 30min. Take 0.5mL freshly prepared NaHTe and add it into the reaction system, continue degassing for 20min, and then reflux for 2.0h to obtain CdTe quantum dots. image 3 Spectral characterization of the synthesized CdTe quantum dots.

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Abstract

The invention discloses a system for reducing carbon dioxide through an inorganic semiconductor photocatalysis system, and a reduction method thereof. The system for reducing carbon dioxide through the inorganic semiconductor photocatalysis system comprises an inorganic semiconductor photocatalyst, a solvent, an electron sacrificing body and an illuminator. The method for reducing carbon dioxide by using the system comprises the following steps: 1, adding the inorganic semiconductor photocatalyst to a photoreactor, carrying out aggregating precipitation by using an acid or a solvent greatly different from a semiconductor raw solution in polarities, centrifuging the obtained solution, and dispersing the obtained precipitate by using a solvent to obtain a catalyst solution; 2, adding the electron sacrificing body to the catalyst solution to obtain a mixed solution; 3, adjusting the pH value of the mixed solution to 2.0-14.0 in order to obtain a reaction solution; 4, introducing carbon dioxide to the reaction solution, and sealing the reaction solution and 5, irradiating the final mixed solution with a light source to carry out a reduction reaction. The system disclosed in the invention has the advantages of simple com position, simplicity in operation, low price, easy obtaining, and high visible light utilization rate.

Description

technical field [0001] The invention relates to an inorganic semiconductor catalyst, in particular to a method for reducing carbon dioxide by an inorganic semiconductor photocatalyst. Background technique [0002] Carbon is one of the four basic elements that constitute living matter, and it exists in various forms in nature; among them, carbon dioxide is the final product of the oxidation of carbon and carbon compounds, and is actually a rich and available carbon source. Since the Industrial Revolution, the extensive exploitation and utilization of fossil fuels such as coal, oil, and natural gas have led to a continuous increase in carbon dioxide emissions. As of 2013, the concentration of carbon dioxide in the atmosphere has exceeded 400ppm. Because carbon dioxide gas has a heat preservation effect, it has become one of the main gases of the greenhouse effect, which has caused serious harm to the earth's ecosystem and human survival. Therefore, how to effectively suppres...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J27/057C01B31/18C07C9/04C07C1/02C07C53/02C07C51/00C07C47/04C07C45/00C07C31/04C07C29/15
CPCY02P20/52
Inventor 吴骊珠李旭兵高雨季黄茂勇李治军
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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