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Preparation method of nitrogen-doped carbon quantum dot and titanium dioxide composite material

A technology of carbon quantum dots and titanium dioxide, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve the problems of low photon quantum efficiency, hydrogen gas has not been reported, etc., achieve broad application prospects, excellent photocatalytic methanol The performance of decomposing hydrogen production and the effect of easy industrial production

Inactive Publication Date: 2015-09-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this material has two deficiencies: (1) TiO 2 The bandgap of TiO is very wide (taking anatase as an example, its bandgap is 3.2ev), it can only be excited by ultraviolet light in sunlight, and cannot be used for light with a wavelength greater than 420nm in sunlight; (2) TiO 2 Electrons and holes on the surface are easy to recombine quickly during the catalytic process, resulting in low photon quantum efficiency (Yu Z-M, Meng J-L, Xiao J-R, et al. Int J Hydrogen Energy, 2014, 39, 15387-15393.)
But so far, for nitrogen-doped carbon quantum dots and TiO 2 The research on compound hydrogen production has not been reported yet

Method used

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  • Preparation method of nitrogen-doped carbon quantum dot and titanium dioxide composite material
  • Preparation method of nitrogen-doped carbon quantum dot and titanium dioxide composite material
  • Preparation method of nitrogen-doped carbon quantum dot and titanium dioxide composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0037] At room temperature, put 2g of glucose and 80ml of acetonitrile into the inner tank of a polytetrafluoroethylene hydrothermal kettle for a hydrothermal reaction (reaction condition is 180°C, 10h); after the reaction kettle is cooled to room temperature, the product is suction filtered, and the filtrate is collected. Wash the filtrate repeatedly with dichloromethane; use a rotary evaporator to evaporate the filtrate at 65°C, and after concentration, use a dialysis bag with a molecular weight cut-off of 100 to dialyze for two weeks; use the rotary evaporator again to concentrate the product at 80°C , And then freeze-drying (-45℃, 48h) to obtain brown powder as nitrogen-doped carbon quantum dots; the obtained nitrogen-doped carbon quantum dots and titanium dioxide are respectively 5:95, 10:90, 15:85 and 20:80 The mass ratio is mixed, and then placed in an oven at 80°C for aging. The material is then dried and put into a methanol solution with a mass fraction of 5% to cataly...

Embodiment 2

[0039] At room temperature, 10g glucose and 80ml acetonitrile are put into the inner tank of a polytetrafluoroethylene hydrothermal kettle for hydrothermal reaction (reaction conditions are 160°C, 14h); after the reaction kettle is cooled to room temperature, the product is suction filtered, and the filtrate is collected. Wash the filtrate repeatedly with dichloromethane; use a rotary evaporator to evaporate the filtrate at 80°C, and after concentration, use a dialysis bag with a cut-off molecular weight of 1,000 to dialyze the product for two weeks; use the rotary evaporator again to concentrate the product at 80°C , Then freeze-drying (-45℃, 48h) to obtain brown powder as nitrogen-doped carbon quantum dots; the obtained nitrogen-doped carbon quantum dots and titanium dioxide are mixed in a mass ratio of 5:95, and then placed in an oven at 80℃ Aging. Subsequently, the material is dried and put into a 5% methanol solution to catalyze hydrogen production under sunlight.

Embodiment 3

[0041] At room temperature, put 5g of glucose and 80ml of acetonitrile into the inner tank of a polytetrafluoroethylene hydrothermal kettle for a hydrothermal reaction (reaction condition is 200°C, 14h); after the reaction kettle is cooled to room temperature, the product is suction filtered, and the filtrate is collected. Wash the filtrate repeatedly with dichloromethane; use a rotary evaporator to evaporate the filtrate at 60°C, and after concentration, use a dialysis bag with a cutoff molecular weight of 300 to dialyze for two weeks; use the rotary evaporator again to concentrate the product at 60°C , Then freeze-drying (-45℃, 48h) to obtain brown powder as nitrogen-doped carbon quantum dots; the obtained nitrogen-doped carbon quantum dots and titanium dioxide are mixed in a mass ratio of 10:90, and then placed in an oven at 80℃ Aging. Subsequently, the material is dried and put into a 5% methanol solution to catalyze hydrogen production under sunlight.

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Abstract

The invention relates to a preparation method of a nitrogen-doped carbon quantum dot and titanium dioxide composite material. The preparation method comprises the following steps: (1) using glucose and a solvent as raw materials, and putting the glucose and the solvent in a hydrothermal kettle inner container for a solvothermal reaction; (2) cooling to room temperature, performing suction filtration, collecting a filter liquor, and using an organic solvent to repeatedly wash the filter liquor; (3) dialyzing after the filter liquor is concentrated; (4) performing freeze drying after the product is concentrated again to obtain nitrogen-doped carbon quantum dots; and (5) obtaining the nitrogen-doped carbon quantum dot and titanium dioxide composite material through mixing and aging. The nitrogen-doped carbon quantum dot and titanium dioxide composite material prepared by the invention has excellent performance of photocatalysis methanolysis hydrogen production under sunlight, and has wide application prospect in the field of new energy sources.

Description

Technical field [0001] The invention belongs to the field of preparing titanium dioxide composite materials, and particularly relates to a method for preparing nitrogen-doped carbon quantum dots / titanium dioxide composite materials. Background technique [0002] Due to the depletion of petroleum resources, hydrogen has received extensive attention as an important clean energy and chemical raw material. Among many hydrogen preparation methods, the use of semiconductor materials to decompose water is a cheap and pollution-free preparation method. Fujishima and Honda (Fujishima A, Honda K. Nature, 1972(238), 37-38.) in 1972, used water as a raw material in titanium dioxide (TiO 2 ) The surface of the electrode is prepared by electrochemical method. 2 , Opened a precedent for the preparation of hydrogen from semiconductors. Since then, ZnO, WO 3 Many other semiconductors have been successfully used as photocatalytic materials to produce hydrogen by water splitting. Among many semic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/18C01B3/32
Inventor 王宏志魏婕张青红李耀刚
Owner DONGHUA UNIV
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