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Preparation method of defect-rich three-dimensional cross-linked g-C3N4 hybrid two-dimensional Ti3C2MXene photocatalyst

A three-dimensional cross-linking, photocatalyst technology, applied in the field of preparation of visible light catalytic materials, can solve the problems of easy stacking, limited practical application, difficult separation, etc., and achieve the effects of high charge transfer, good visible light response, and large specific surface area.

Pending Publication Date: 2022-03-01
XINXIANG MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, two-dimensional g-C 3 N 4 Based catalysts are easy to stack during the photocatalytic process, and are not easy to separate after photocatalytic treatment, which largely limits their practical applications.
Therefore, the two-dimensional g-C 3 N 4 Cross-linking into a three-dimensional porous structure while introducing defects, and hybridizing with a two-dimensional MXene co-catalyst to construct a Schottky heterojunction will be able to effectively solve the problem of two-dimensional g-C 3 N 4 There are no relevant reports about the problems faced by the based catalysts.

Method used

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  • Preparation method of defect-rich three-dimensional cross-linked g-C3N4 hybrid two-dimensional Ti3C2MXene photocatalyst
  • Preparation method of defect-rich three-dimensional cross-linked g-C3N4 hybrid two-dimensional Ti3C2MXene photocatalyst
  • Preparation method of defect-rich three-dimensional cross-linked g-C3N4 hybrid two-dimensional Ti3C2MXene photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028]First, dissolve 50mmol melamine and 50mmol cyanuric acid in 100mL deionized water and stir for 12h; then transfer the stirred solution to a glass dish and dry at 60°C for 12h; grind the obtained precursor and anneal at 550°C After 4 hours of treatment, the three-dimensional cross-linked g-C 3 N 4 Sample; 1.0 g of three-dimensional cross-linked g-C 3 N 4 Mix the sample with 0.05g sodium borohydride evenly, and anneal at 300°C for 1 hour to obtain a yellow defect-rich three-dimensional cross-linked g-C 3 N 4 Sample; take 2.0g defect-rich three-dimensional cross-linked g-C 3 N 4 The sample was dispersed in 100mL hydrochloric acid solution (1mol / L), after ultrasonic treatment, washed and dried to obtain the protonated defect-rich three-dimensional cross-linked g-C 3 N 4 sample.

[0029] Take 1.0g of lithium fluoride and slowly dissolve it in 40mL of hydrochloric acid solution with a concentration of 5mol / L, stir for 10min to fully dissolve it, and slowly add 3g of Ti...

Embodiment 2

[0032] First, dissolve 10mmol melamine and 10mmol cyanuric acid in 100mL deionized water and stir for 12h; then transfer the stirred solution to a glass dish and dry at 60°C for 12h; grind the obtained precursor and anneal at 600°C After 4 hours of treatment, the three-dimensional cross-linked g-C 3 N 4 Sample; 1.0 g of three-dimensional cross-linked g-C 3 N 4 Mix the sample with 0.05g sodium borohydride evenly, and anneal at 400°C for 1 hour to obtain a yellow defect-rich three-dimensional cross-linked g-C 3 N 4 Sample; take 2.0g defect-rich three-dimensional cross-linked g-C 3 N 4 The sample was dispersed in 100mL hydrochloric acid solution (1mol / L), after ultrasonic treatment, washed and dried to obtain the protonated defect-rich three-dimensional cross-linked g-C 3 N 4 sample.

[0033] Take 3.0g of lithium fluoride and slowly dissolve it in 40mL of hydrochloric acid solution with a concentration of 2.5mol / L, stir for 10min to fully dissolve it, and slowly add 1g of...

Embodiment 3

[0036] Take 10 mg of defect-rich three-dimensional cross-linked g-C prepared in Example 1 3 N 4 Hybridized 2D Ti 3 C 2 The MXene photocatalyst was dispersed in 80mL of RhB solution with a concentration of 20mg / L, stirred in dark light for 30min, turned on the light source, timed, and took samples and filtered at specific time points for analysis. After 25min of reaction under visible light, the degradation rate of RhB was 100%. See the effect for details Figure 4 .

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Abstract

The invention discloses a preparation method of a defect-rich three-dimensional cross-linked g-C3N4 hybridized two-dimensional Ti3C2 MXene photocatalyst, which comprises the following steps: taking melamine and cyanuric acid as precursors to obtain a three-dimensional porous structure catalyst, and preparing a three-dimensional cross-linked g-C3N4 sample by adopting a one-step calcination method; then uniformly mixing the three-dimensional cross-linked g-C3N4 with sodium borohydride, and performing drying and annealing treatment to obtain a defect-rich three-dimensional cross-linked g-C3N4 sample; then, the g-C3N4 / Ti3C2 Schottky heterojunction catalyst is protonated and hybridized with a two-dimensional MXene nanosheet, and the g-C3N4 / Ti3C2 Schottky heterojunction catalyst is prepared; the catalyst has a relatively large specific surface area and good photogenerated charge migration efficiency, and shows excellent and stable organic pollutant photocatalytic degradation and hydrogen production performance under visible light.

Description

technical field [0001] The invention belongs to the technical field of preparation of visible light catalytic materials, in particular to a defect-rich three-dimensional crosslinked g-C 3 N 4 Hybridized 2D Ti 3 C 2 The preparation method of MXene photocatalyst is used to achieve high-efficiency organic pollutant degradation and photocatalytic hydrogen production. Background technique [0002] Based on the conversion and utilization of solar energy, photocatalytic technology provides an important opportunity to solve the problems of environmental pollution and energy shortage. Among many catalysts, graphitic carbon nitride (g-C 3 N 4 ) is a cheap non-metallic photocatalyst with good chemical stability, suitable energy band structure, and easy preparation (precursors such as melamine, dicyandiamine, or urea can be obtained by simple high-temperature polycondensation) and other advantages. It has become a popular material for photocatalysis in recent years. However, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J27/24B01J35/00C01B3/04C02F1/30C02F101/30
CPCB01J27/24B01J27/22C01B3/042C02F1/30C02F2305/10C02F2101/30B01J35/39Y02E60/36
Inventor 刘冬潘翠云牛天琦倪天军赵茜张丰泉李春玲
Owner XINXIANG MEDICAL UNIV
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