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Preparation method of two-dimensional carbon nitride/two-dimensional titanium dioxide composite material

A technology of titanium dioxide and composite materials, which is applied in the field of nanomaterials and photocatalysis, can solve the problems of small interfacial contact area of ​​composite materials, low light utilization rate of titanium dioxide, and high recombination rate of photogenerated carriers, so as to improve photocatalytic activity, close contact, The effect of shortening the transmission distance

Active Publication Date: 2019-04-23
浙江理工大学上虞工业技术研究院有限公司
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  • Description
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Problems solved by technology

[0005] The object of the present invention is to address the above problems, to provide a method for preparing a two-dimensional carbon nitride and two-dimensional titanium dioxide composite material, which solves the problem of small specific surface area of ​​carbon nitride, high recombination rate of photogenerated carriers and high utilization of titanium dioxide in the prior art. Low rate, small interface contact area of ​​composite materials, loose contact, etc.

Method used

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  • Preparation method of two-dimensional carbon nitride/two-dimensional titanium dioxide composite material
  • Preparation method of two-dimensional carbon nitride/two-dimensional titanium dioxide composite material
  • Preparation method of two-dimensional carbon nitride/two-dimensional titanium dioxide composite material

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Embodiment 1

[0022] Step 1: Mix and grind 4 grams of melamine and 10 grams of ammonium chloride evenly, transfer to a crucible, raise the temperature to 550°C in a muffle furnace at a rate of 2°C / min, and anneal for 2 hours to obtain yellow carbon nitride nanosheets .

[0023] Step 2: Add 200 mg of the above-mentioned carbon nitride into 31.5 ml of isopropanol, and ultrasonically disperse for 30 min. Then add 0.025 mL of diethylenetriamine (EDTA) into it, stir for 10 min, continue to add 1.125 mL of diisopropyl di(acetylacetonate) titanate, and stir for 10 min. The resulting solution was transferred into a reaction kettle, and subjected to solvent heat treatment at 200° C. for 24 hours. After the reaction, cool to room temperature, wash the precipitate three times with deionized water and absolute ethanol, place in an oven at 60°C, and dry for 24 hours to obtain a two-dimensional carbon nitride / two-dimensional titanium dioxide nanocomposite material.

[0024] figure 1 It is the XRD patt...

Embodiment 2

[0029] Step 1: Mix and grind 1 gram of melamine and 2 grams of ammonium chloride evenly, transfer to a crucible, raise the temperature in a muffle furnace to 500°C at a rate of 1°C / min, and anneal for 2 hours to obtain yellow carbon nitride nanosheets .

[0030] Step 2: Add 100 mg of the above-mentioned carbon nitride into 30 ml of isopropanol, and ultrasonically disperse for 30 min. Then add 0.02 mL of diethylenetriamine (EDTA) into it, stir for 10 min, continue to add 1.0 mL of diisopropyl di(acetylacetonate) titanate, and stir for 10 min. The resulting solution was transferred into a reaction kettle, and subjected to solvent heat treatment at 180° C. for 20 hours. After the reaction, cool to room temperature, wash the precipitate three times with deionized water and absolute ethanol, place in an oven at 60°C, and dry for 24 hours to obtain a two-dimensional carbon nitride / two-dimensional titanium dioxide nanocomposite material.

[0031] According to the method described i...

Embodiment 3

[0033] Step 1: Mix and grind 10 grams of melamine and 25 grams of ammonium chloride evenly, transfer them to a crucible, raise the temperature to 600 degrees Celsius at a rate of 10 degrees Celsius / min in a muffle furnace, and anneal for 4 hours to obtain yellow carbon nitride nanosheets .

[0034]Step 2: Take 800 mg of the above-mentioned carbon nitride and add it to 35 ml of isopropanol, and ultrasonically disperse for 30 min. Then add 0.05 mL of diethylenetriamine (EDTA) into it, stir for 10 min, continue to add 1.5 mL of diisopropyl di(acetylacetonate) titanate, and stir for 10 min. The resulting solution was transferred into a reaction kettle, and subjected to solvent heat treatment at 220° C. for 30 hours. After the reaction, cool to room temperature, wash the precipitate three times with deionized water and absolute ethanol, place in an oven at 60°C, and dry for 24 hours to obtain a two-dimensional carbon nitride / two-dimensional titanium dioxide nanocomposite material....

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Abstract

The invention provides a preparation method of a two-dimensional carbon nitride / two-dimensional titanium dioxide composite material. The two-dimensional carbon nitride / two-dimensional titanium dioxidecomposite material is formed by in-situ growing titanium dioxide nanosheets on surfaces of carbon nitride nanosheets. The preparation method has the advantages that the two-dimensional / two-dimensional heterojunction composite material is larger in specific surface area and larger in interface contact area, can provide a high-speed current carrier transfer passage, can improve the photon-generatedcarrier separation and transfer efficiency, and can provide more photocatalytic water-decomposition hydrogen-generation reaction active sites, and has outstanding photocatalytic activity. The preparation method of the invention is simple in preparation process, reaction conditions are easy to control, and the prepared two-dimensional carbon nitride / two-dimensional titanium dioxide composite material is a high-efficient and stable photocatalyst and is suitable for the mass preparation and industrialized production.

Description

technical field [0001] The invention relates to the preparation of a two-dimensional carbon nitride / two-dimensional titanium dioxide composite material, which belongs to the technical field of nanometer materials and photocatalysis. Background technique [0002] The development of clean, renewable energy is the key to meeting the increasing global energy demand and solving the problem of environmental pollution. The most attractive thing is to use semiconductor photocatalyst to split water to produce hydrogen, and convert the inexhaustible solar energy into clean and pollution-free hydrogen energy. [0003] The non-metallic semiconductor graphite phase carbon nitride has an energy band of 2.7 eV. It has excellent visible light photocatalytic activity, remarkable thermochemical stability, and the preparation method is simple, non-toxic, and low in price. It has become a research hotspot in the field of science and technology in recent years. However, carbon nitride has a sma...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/02B01J37/08C01B3/04
CPCC01B3/042B01J27/24B01J37/0215B01J37/082B01J35/39Y02E60/36
Inventor 崔灿闫玉梅
Owner 浙江理工大学上虞工业技术研究院有限公司
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