Method for preparing heterojunction photocatalyst

A photocatalyst and heterojunction technology, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve undiscovered problems, and achieve regular morphology, complete crystallization, and good dispersion.

Active Publication Date: 2017-01-11
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, no one has been found to prepare NQGDs-ZnNb

Method used

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  • Method for preparing heterojunction photocatalyst
  • Method for preparing heterojunction photocatalyst
  • Method for preparing heterojunction photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1NGQDs-BiOI / MnNb 2 O 6 Preparation of p-n junction photocatalyst

[0018] Add 0.5 g of Nb 2 O 5 Mix with 3.37 g of KOH, add 60 ml of distilled water and react for 3 days at 200 ℃ to obtain the precursor liquid [Nb 6 O 19 ] 8- ; Take 16 ml of precursor liquid (containing 0.5mmolNb 5+ ), adjust the pH of the above solution to 7.8 with a hydrochloric acid solution, and then add different molar amounts of g-C obtained by calcining urea 3 N 4 (0.25, 0.75, 1.25, 1.75 and 2.25mmol) After stirring for 30 minutes, add 0.25mmol Zn(NO 3 )·6H 2 O (abbreviated as: Zn / CN, Zn / 3CN, Zn / 5CN, Zn / 7CN and Zn / 9CN) and different amounts of NGQDs obtained by pyrolysis of ammonium citrate, of which NGQDs and ZnNb 2 O 6 / g-C 3 N 4 The mass ratio of the sum of masses is 1:100; 3:100; 5:100 and 7:100 (abbreviated as: 1%NGQDs-ZnNb 2 O 6 / g-C 3 N 4 , 3% NGQDs-ZnNb 2 O 6 / g-C 3 N 4 , 5% NGQDs-ZnNb 2 O 6 / g-C 3 N 4 And 7% NGQDs-ZnNb 2 O 6 / g-C 3 N 4 ) And continuous stirring for 60 minutes; finally,...

Example Embodiment

[0019] Example 2NGQDs-ZnNb 2 O 6 / g-C 3 N 4 Characterization and analysis of heterojunction photocatalyst

[0020] Such as figure 1 As shown in a, ZnNb 2 O 6 / g-C 3 N 4 The composite sample has ZnNb 2 O 6 The peak has g-C 3 N 4 Peak, and g-C 3 N 4 The peak intensity of is accompanied by g-C 3 N 4 The content increases and becomes stronger; such as figure 1 b, when NGQDs introduce ZnNb 2 O 6 / g-C 3 N 4 After the surface, no diffraction peaks of NGQDs were found, which may be due to the presence of NGQDs in NGQDs-ZnNb 2 O 6 / g-C 3 N 4 The content in the heterojunction is relatively small, the dispersibility is relatively high and the crystallinity is relatively low.

[0021] figure 2 a-b can be observed, pure ZnNb 2 O 6 Shows a large-scale microsphere structure composed of many nanosheets; such as figure 2 As shown in c, g-C 3 N 4 Presents a sheet-like graphene-like structure; figure 2 d shows g-C 3 N 4 Nanosheets and three-dimensional flower-like ZnNb 2 O 6 Mixed together to form Z...

Example Embodiment

[0022] Example 3 NGQDs-ZnNb 2 O 6 / g-C 3 N 4 Visible light catalytic activity experiment of heterojunction photocatalyst

[0023] (1) The co-catalyst (0.6% Pt) nanocrystals are deposited to 50mg NGQDs-ZnNb by light 2 O 6 / g-C 3 N 4 The surface of the target composite system to enhance its catalytic activity.

[0024] (2) On-line detection of NGQDs-ZnNb under visible light (420-680nm) irradiation through the photolysis water hydrogen production test platform 2 O 6 / g-C 3 N 4 The photocatalytic hydrogen production efficiency of the target composite system; a visible light source with a fixed wavelength (420nm) is used to irradiate a closed transparent device containing the target composite system aqueous solution.

[0025] (3) Detect the hydrogen production by gas chromatography every 30 minutes, and calculate the hydrogen production efficiency.

[0026] (4) by image 3 It can be seen that the prepared NGQDs-ZnNb 2 O 6 / g-C 3 N 4 The catalyst has excellent visible light decomposition of...

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Abstract

The invention relates to the technical field of photocatalytic oxidation treatment, particularly relates to a method for preparing an NQGDs-zNnB2O6/G-C3N4 heterojunction photocatalyst by taking C6H5O7(NH43), Nb2O5, KOH, Zn(NO3).6H2O and urea as raw materials. The method has the advantages that the preparation technology is simple and the cost is low.

Description

technical field [0001] The invention relates to the technical field of photocatalytic oxidation treatment, in particular to a 6 h 5 o 7 (NH 4 ) 3 , Nb 2 o 5 , KOH, Zn(NO 3 )·6H 2 O and urea as raw materials to prepare NQGDs-ZnNb 2 o 6 / g -C 3 N 4 The method of the heterojunction photocatalyst is a method with simple preparation process and low cost. Background technique [0002] In today's society, the excessive use of fossil energy has caused serious damage to the global environment, and hydrogen energy can be used as an alternative energy due to its recyclability and environmental friendliness. Photocatalytic water splitting to produce hydrogen is a promising technology, which can realize the conversion of solar energy to chemical energy, and the pollution-free combustion process makes hydrogen have incomparable advantages in green energy. [0003] Carbon Nitride (g-C 3 N 4 ), due to its good chemical and thermal stability, low cost, safety and non-toxicity,...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24B01J35/004C01B3/042Y02E60/36
Inventor 严铭施伟东花银群朱芳芳孙林顾巍
Owner JIANGSU UNIV
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