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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  • Summary
  • 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 2 o 6 / g -C 3 N 4 Heterojunction Photocatalyst Materials

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

Embodiment 1

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

[0018] 0.5 g of Nb 2 o 5 Mix with 3.37 g of KOH, add 60 ml of distilled water and react at 200°C for 3 days to obtain the precursor liquid [Nb 6 o 19 ] 8- ; Take 16 milliliters of precursor liquid (containing 0.5mmolNb 5+ ), the pH value of the above solution was adjusted to 7.8 with hydrochloric acid solution, and subsequently, different molar amounts of g-C obtained by calcining urea were added 3 N 4 (0.25, 0.75, 1.25, 1.75 and 2.25mmol) were stirred for 30 minutes before adding 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, where NGQDs with ZnNb 2 o 6 / g -C 3 N 4 The mass ratio of the mass sum 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-Zn...

Embodiment 2

[0019] Embodiment 2NGQDs-ZnNb 2 o 6 / g -C 3 N 4 Characterization Analysis of Heterojunction Photocatalysts

[0020] Such as figure 1 As shown in a, ZnNb 2 o 6 / g -C 3 N 4 Composite samples have both ZnNb 2 o 6 g-C 3 N 4 peak, and g-C 3 N 4 The peak intensity of g-C accompanies 3 N 4 content increases and becomes stronger; as figure 1 b, When NGQDs were introduced into ZnNb 2 o 6 / g -C 3 N 4 On the surface, no diffraction peaks of NGQDs were found, which may be due to the presence of NGQDs in the NGQDs-ZnNb 2 o 6 / g -C 3 N 4 The content in the heterojunction is relatively small, the dispersion is relatively high and the crystallinity is relatively low.

[0021] figure 2 a-b It can be observed that pure ZnNb 2 o 6 presents a large-scale microsphere structure composed of many nanosheets; as figure 2 c, g-C 3 N 4 Presents a sheet-like graphene structure; figure 2 d shows g-C 3 N 4 Nanosheets and 3D flower-like ZnNb 2 o 6 mixed together to form...

Embodiment 3

[0022] Embodiment 3NGQDs-ZnNb 2 o 6 / g -C 3 N 4 Visible light catalytic activity experiments of heterojunction photocatalysts

[0023] (1) Deposit cocatalyst (0.6% Pt) nanocrystals onto 50 mg 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 the irradiation of visible light (420-680nm) by 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 closed and transparent device containing an aqueous solution of the target composite system is irradiated with a visible light source with a fixed wavelength (420nm).

[0025] (3) The hydrogen production is detected by gas chromatography every 30 minutes, and the hydrogen production efficiency is calculated.

[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 ...

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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
CPCC01B3/042B01J27/24B01J35/39Y02E60/36
Inventor 严铭施伟东花银群朱芳芳孙林顾巍
Owner JIANGSU UNIV
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