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Preparation method and application of a three-dimensional porous composite photocatalyst

A three-dimensional porous, composite light technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of small specific surface area, uneven morphology, and imperfect specific surface area, etc. Specific surface area, easy operation effect

Active Publication Date: 2020-02-21
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

g-C 3 N 4 As a non-metallic photocatalyst, it is favored by many photocatalytic researchers for its high thermal and chemical stability, suitable energy band gap and convenient preparation method, but g-C obtained by calcining 3 N 4 There are many disadvantages, such as uneven morphology, small specific surface area, etc., the present invention prepares three-dimensional porous g-C 3 N 4 to increase g-C 3 N 4 The specific surface area, but the unilateral increase of g-C 3 N 4 The specific surface area is not perfect enough, so measures such as doping and loading carrier materials are needed to make up for its deficiency

Method used

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  • Preparation method and application of a three-dimensional porous composite photocatalyst
  • Preparation method and application of a three-dimensional porous composite photocatalyst
  • Preparation method and application of a three-dimensional porous composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Three-dimensional porous g-C 3 N 4 Precursor preparation:

[0030] Weigh 10g of urea and put it into a crucible after fully grinding it, put it into a muffle furnace for high-temperature calcination at 500°C for 4h, and the heating rate is 2°C / min to obtain the initial g-C 3 N 4 , after weighing 1.6g NaHCO 3 and 0.4g initial g-C 3 N 4 After sufficient grinding, calcinate at 350°C for 1 hour, the heating rate is 5°C / min, and the obtained sample is thoroughly ground with an agate mortar to obtain a three-dimensional porous g-C 3 N 4 Precursor.

[0031] (2) Three-dimensional porous AgBr / g-C 3 N 4 Preparation of intermediates:

[0032] Weigh 0.2g three-dimensional porous g-C 3 N 4 Place the precursor in a glass beaker, add ethanol for ultrasonic dispersion for 1 hour, and magnetically stir; then add 50 mL of 0.08 mol / L CTAB to the above mixed solution, and after sufficient magnetic stirring for 6 hours, slowly add 50 mL of silver nitrate solution of the same...

Embodiment 2

[0035] (1) Three-dimensional porous g-C 3 N 4 Precursor preparation:

[0036] Weigh 10g of urea, grind it sufficiently, put it in a large crucible, and put it into a muffle furnace for high-temperature calcination at 500°C for 4h (the heating rate is 2°C / min) to obtain the initial g-C 3 N 4 , after weighing 1.6g NaHCO 3 and 0.4g initial g-C 3 N 4 After sufficient grinding, calcined at 350°C for 1h (heating rate: 5°C / min), and the obtained sample was thoroughly ground with an agate mortar to obtain a three-dimensional porous g-C 3 N 4 Precursor.

[0037] (2) Three-dimensional porous AgBr / g-C 3 N 4 Preparation of intermediates:

[0038] Weigh 0.2g two-dimensional porous g-C 3 N 4 Place the precursor in a glass beaker, add ethanol for ultrasonic dispersion for 1 hour, and magnetically stir; then add 50 mL of 0.10 mol / L CTAB to the above mixed solution, and after fully magnetic stirring for 6 hours, slowly add 50 mL of silver nitrate solution of the same concentration ...

Embodiment 3

[0041] (1) Three-dimensional porous g-C 3 N 4 Precursor preparation:

[0042] Weigh 10g of urea, grind it sufficiently, put it in a large crucible, and put it into a muffle furnace for high-temperature calcination at 500°C for 4h (the heating rate is 2°C / min) to obtain the initial g-C 3 N 4 , after weighing 1.6g NaHCO 3 and 0.4g initial g-C 3 N 4 After sufficient grinding, calcined at 350°C for 1h (heating rate: 5°C / min), and the obtained sample was thoroughly ground with an agate mortar to obtain a three-dimensional porous g-C 3 N 4 Precursor.

[0043] (2) Three-dimensional porous AgBr / g-C 3 N 4 Preparation of intermediates:

[0044] Weigh 0.2g three-dimensional porous g-C 3 N 4 Place the precursor in a glass beaker, add ethanol for ultrasonic dispersion for 1 hour, and magnetically stir; then add 50 mL of 0.12 mol / L CTAB to the above mixed solution, and after fully magnetic stirring for 6 hours, take 50 mL of silver nitrate solution of the same concentration and ...

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Abstract

The invention belongs to the technical field of environmental protection material preparation, and specifically refers to the preparation and application of a three-dimensional porous composite photocatalyst. First, the calcination method is used to prepare the initial g‑C 3 N 4 , in passing with NaHCO 3 Three-dimensional porous g-C prepared by mixing and calcining 3 N 4 Precursor, and then prepare AgBr / g‑C by precipitation method 3 N 4 intermediate, and finally prepared three-dimensional porous rGO / AgBr / g‑C by hydrothermal method 3 N 4 The composite photocatalyst is used to degrade tetracycline and 2,4-dichlorophenol; the present invention prepares efficient three-dimensional porous rGO / AgBr / g-C through a simple preparation method and simple operation process. 3 N 4 Composite photocatalyst, and its use will not cause waste of resources and the formation of secondary pollution. It is a green, environmentally friendly and efficient pollution treatment photocatalyst.

Description

technical field [0001] The invention belongs to the technical field of preparation of environmental protection materials, in particular to a preparation method and application of a three-dimensional porous composite photocatalyst. First urea is calcined to get initial g-C 3 N 4 , then g-C 3 N 4 with NaHCO 3 Three-dimensional porous g-C can be obtained by grinding sufficiently at a certain ratio and calcining 3 N 4 , and then loaded AgBr on three-dimensional porous g-C by precipitation method 3 N 4 internal and external surfaces, and finally rGO and AgBr / g-C 3 N 4 Uniform ultrasonic dispersion and synthesis of three-dimensional porous rGO / AgBr / g-C by hydrothermal reaction 3 N 4 composite photocatalyst. Background technique [0002] Antibiotics are a class of secondary metabolites produced by microorganisms (including bacteria, fungi, actinomycetes, etc.) or higher animals and plants in the process of life and production, with anti-pathogen or other activities, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/36
CPCC02F1/30B01J27/24C02F2101/36B01J35/30B01J35/39
Inventor 周亚举刘重阳李金择张玮玮关静茹霍鹏伟王会琴闫永胜
Owner JIANGSU UNIV
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