Method for preparing ultrathin g-C3N4/Al2O3 nano-grade composite photocatalyst

A nanocomposite and photocatalyst technology, applied in the field of photocatalytic materials, can solve the problems of complex preparation process, long time-consuming, low photocatalytic hydrogen production efficiency, etc., and achieve the effect of simple preparation process, short time-consuming, and improved photocatalytic activity

Active Publication Date: 2016-10-26
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

These methods have problems such as complicated preparation process, long time-consuming, and low photocatalytic hydrogen production efficiency of the obtained product.

Method used

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  • Method for preparing ultrathin g-C3N4/Al2O3 nano-grade composite photocatalyst
  • Method for preparing ultrathin g-C3N4/Al2O3 nano-grade composite photocatalyst
  • Method for preparing ultrathin g-C3N4/Al2O3 nano-grade composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Measure 50 mL of methanol into a round-bottomed flask, weigh 2.5 g of melamine into the above-mentioned round-bottomed flask, and stir for 0.5 h under reflux at 60°C to obtain a suspension.

[0026] (2) Measure 50mL methanol into a beaker, weigh 1.0gAl(NO 3 ) 3 9H 2 O was added to the above beaker, stirred to obtain a clear solution; the solution was transferred to the round bottom flask in step (1), and stirred at 60°C under reflux for 2 hours to obtain a suspension;

[0027] (3) The suspension obtained in step (2) was filtered, washed, and dried; the dried solid was calcined in a muffle furnace at 550°C for 3 hours to obtain Al 2 o 3 / g -C 3 N 4 Composite photocatalyst finished product.

[0028] Gained catalyst is carried out X-ray diffraction test (see figure 1 ), it can be seen that the composite catalyst contains graphite phase C 3 N 4 and amorphous Al 2 o 3 . figure 2 For the Al prepared in Example 1 2 o 3 / g -C 3 N 4 Nitrogen adsorption-desor...

Embodiment 2

[0030] (1) Measure 50 mL of methanol into a round-bottomed flask, weigh 2.5 g of melamine into the above-mentioned round-bottomed flask, and stir for 0.5 h under reflux at 60°C to obtain a suspension.

[0031] (2) Measure 50mL methanol into a beaker, weigh 2.0 gAl(NO 3 ) 3 9H 2 O was added to the above beaker, and stirred to obtain a clear solution; the solution was transferred to the round bottom flask in step (1), and stirred at 60°C under reflux for 1.5 hours to obtain a suspension;

[0032] (3) Other preparation methods are the same as in Example 1.

[0033] For the resulting finished product Al 2 o 3 / g -C 3 N 4 Composite photocatalysts were tested by X-ray diffraction (see figure 1 ), it can be seen that the composite catalyst contains graphite phase C 3 N 4 , and the amorphous Al 2 o 3 ; The specific surface area of ​​the composite catalyst is 72.6 m 2 / g; Carry out visible light catalytic water splitting experiment according to the method for embodiment 1, ...

Embodiment 3

[0035] (1) Measure 50 mL of methanol into a round-bottomed flask, weigh 2.5 g of melamine into the above-mentioned round-bottomed flask, and stir for 0.5 h under reflux at 60°C to obtain a suspension.

[0036] (2) Measure 50mL methanol into a beaker, weigh 0.5gAl(NO 3 ) 3 9H 2 O was added to the above beaker, stirred to obtain a clear solution; the solution was transferred to the round bottom flask in step (1), and stirred at 60°C under reflux for 2 hours to obtain a suspension;

[0037] (3) Other preparation methods are the same as in Example 1.

[0038] For the resulting finished product Al 2 o 3 / g -C 3 N 4 Composite photocatalysts were tested by X-ray diffraction (see figure 1 ), it can be seen that the composite catalyst contains graphite phase C 3 N 4 , and the amorphous Al 2 o 3 ; The specific surface area of ​​the composite catalyst is 32.1 m 2 / g; Carry out visible light catalytic water splitting experiment according to the method for embodiment 1, see F...

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Abstract

The invention discloses a method for preparing an ultrathin g-C3N4 / Al2O3 nano-grade composite photocatalyst. The method comprises the following steps: (1) melamine is added into methanol; heating, condensation, reflux and stirring are carried out, such that a suspension liquid A is obtained; (2) a certain amount of aluminum nitrate nonahydrate is dissolved in methanol; the solution is mixed and stirred with the suspension liquid obtained in the step (1), such that a suspension liquid B is obtained; (3) the suspension liquid B obtained in the step (2) is filtered, washed and dried; and a solid obtained after drying is calcined in a Muffle furnace, such that a finished product is obtained. According to the synthesized ultrathin g-C3N4 / Al2O3 nano-grade composite photocatalyst provided by the invention, the specific surface area of g-C3N4 can be improved; with the compounding of aluminum oxide, photocatalytic activity of g-C3N4 can be effectively improved. Under visible light, the rates of the ultrathin g-C3N4 / Al2O3 nano-grade composite photocatalyst for producing hydrogen by decomposing water and for photo-degrading Rhodamine B are substantially higher than those of single-phase g-C3N4 prepared through melamine pyrolysis. The method is simple, and has the advantages of low cost and low pollution. The method meets the requirements of production reality.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, especially a one-step in-situ preparation of ultra-thin g-C 3 N 4 / Al 2 o 3 The invention relates to a nanocomposite photocatalyst method, which belongs to the technical field of photocatalytic materials. Background technique [0002] Using photocatalysts to convert solar energy into energy that can be directly used by humans, and using it to solve the depletion of earth's resources and the deterioration of the living environment, is a direction of renewable and clean energy research. g-C 3 N 4 The unique structure endows it with good photocatalytic properties, making it a research hotspot in the field of photocatalysis. g-C 3 N 4 It is a non-metallic semiconductor, composed of C and N elements that are more abundant on the earth, with a band gap of about 2.7eV, and has certain visible light absorption. Compared with the photocatalyst of traditional transition metal compounds, it has l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C01B3/04C02F101/30
CPCB01J27/24B01J35/004B01J35/023B01J35/1014C01B3/042C01B2203/1088C02F1/30C02F2101/30C02F2305/10Y02E60/36
Inventor 王晓静李旭力李发堂
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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