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A modified g-c with glutamic acid 3 no 4 -cu 2 oPreparation method and application of composite catalyst

A composite catalyst, g-c3n4 technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as easy deactivation, photocatalytic efficiency needs to be improved, etc. Good temperature, ensuring photocatalytic performance, and the effect of large specific surface area

Active Publication Date: 2019-10-15
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But Cu 2 O is easily deactivated when degrading pollutants, and the rapid recombination of photogenerated electron-hole pairs leads to Cu 2 The photocatalytic efficiency of O needs to be improved

Method used

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  • A modified g-c with glutamic acid <sub>3</sub> no <sub>4</sub> -cu <sub>2</sub> oPreparation method and application of composite catalyst
  • A modified g-c with glutamic acid <sub>3</sub> no <sub>4</sub> -cu <sub>2</sub> oPreparation method and application of composite catalyst
  • A modified g-c with glutamic acid <sub>3</sub> no <sub>4</sub> -cu <sub>2</sub> oPreparation method and application of composite catalyst

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preparation example Construction

[0034] Embodiment of the present invention uses PEG to modify g-C 3 N 4 -Cu 2 The preparation method of O composite catalyst, described method comprises the steps:

[0035] obtaining a first solution comprising Cu in dissolved state 2+ , and glutamic acid;

[0036]Add protonated g-C to the first solution 3 N 4 , stirred, sonicated to obtain a suspension;

[0037] Add xylitol to the suspension under stirring, adjust the pH value to 10-12, and stir to obtain a mixed solution;

[0038] Heating the mixed solution to 150-200°C in a high-pressure reaction vessel, and reacting at a constant temperature for 25-35 hours to obtain a reactant;

[0039] The cooled reactant is separated from solid and liquid, washed, and dried in vacuum to obtain a solid product;

[0040] The solid product is heated to 150-250°C under the protection of an inert gas and kept at a constant temperature for 1h-3h to obtain g-C 3 N 4 -Cu 2 O composite catalyst.

[0041] g-C 3 N 4 It has good chemi...

Embodiment 1

[0048] Raw Materials and Reagents

[0049] Dicyandiamide (C 2 h 4 N 4 ), copper sulfate pentahydrate (CuSO 4 ·5H 2 O), sodium hydroxide (NaOH), and hydrochloric acid (HCl) were of analytical grade (AR), purchased from Sinopharm Chemical Reagent Co., Ltd.; xylitol (C 5 h 12 0 5 ), methyl orange (C 14 h 14 N 3 NaO 3 S) were analytically pure (AR), purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0050] g-C 3 N 4 preparation of

[0051] g-C 3 N 4 -Cu 2 Preparation of O composite catalyst

[0052] First, 1.25 g of CuSO was mixed under magnetic stirring 4 ·5H 2 Add O to 40mL deionized water, add 0.5g glutamic acid, when the solution turns dark blue, continue to add g-C to the above solution 3 N 4 (g-C 3 N 4 : Cu 2 The mass ratio of O is 1:5), after magnetic stirring for 1 h, continue ultrasonication for 1 h to obtain a uniform suspension, then add 1.5 g of xylitol to the above suspension under magnetic stirring, and then use 1 mol / LNaOH s...

Embodiment 2

[0054] The raw materials and reagents are similar to those in Example 1 and will not be repeated here.

[0055] g-C 3 N 4 preparation of

[0056] Preparation of g-C by High Temperature Pyrolysis of Dicyandiamide 3 N 4 : Weigh 4g of dicyandiamide and place it in a corundum crucible with a cover, put the crucible into a muffle furnace, heat up to 500°C with a heating rate of 1k / min in an air atmosphere, and keep it warm for 5h, and wait for the product to naturally After cooling, the obtained yellow powder was ground for 30 min, and the obtained preliminary product was ground for later use. Mix 10ml of concentrated sulfuric acid and add it into a 50ml flask, stir at room temperature for 6h, and sonicate for 2h. The stirred mixture is slowly poured into 100ml of deionized water while stirring. The obtained milky white suspension was centrifuged at 3000 r for 10 min and washed with deionized water. Dry at 80°C. Weigh the acidified g-C 3 N 4 Pour 0.4g into a 200ml flask, ...

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Abstract

The invention provides a method of modifying g-C with glutamic acid 3 N 4 ‑Cu 2 Preparation method of O composite catalyst and its application, the method includes the following steps: obtaining a first solution, the first solution includes Cu in a dissolved state 2+ ions as well as glutamic acid; add protonated g‑C to the first solution 3 N 4 , stir, and ultrasonic to obtain a suspension; add xylitol to the suspension under stirring, adjust the pH value to 10-12, and stir to obtain a mixed solution; heat the mixed solution to 150 in a high-pressure reaction vessel -200°C, constant temperature reaction for 25-35h to obtain the reactants; separate the cooled reactants from solid and liquid, wash, and vacuum dry to obtain a solid product; heat the solid product to 150-250°C under the protection of inert gas and maintain Keep the temperature constant for 1h-3h to obtain g-C 3 N 4 ‑Cu 2 O composite catalyst. The composite catalyst has stronger visible light absorption ability, and enhanced photocatalytic performance and stability.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a g-C modified with glutamic acid 3 N 4 -Cu 2 Preparation method and application of O composite catalyst. Background technique [0002] Semiconductor photocatalyst is an environmentally friendly material, which is expected to solve the energy crisis and environmental problems brought about by modern industry. Photocatalysts have great potential in photolysis hydrogen production, decomposition of harmful gases, and degradation of organic pollutants. As an effective method, photocatalytic technology has produced good results in the treatment of environmental pollutants. The application of nano photocatalytic materials in photocatalytic degradation of organic pollutants in wastewater has been widely confirmed. [0003] Cu 2 O is a new type of semiconductor material, which has excellent photocatalytic properties and has a wide range of applications in light energy conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10C02F1/30C02F101/34C02F101/38
CPCC02F1/30B01J27/24C02F2101/34C02F2101/38C02F2101/40C02F2101/308C02F2305/10B01J35/50B01J35/40B01J35/39B01J35/61
Inventor 李东亚夏东升徐海明廖伟左诗语曹刚袁向娟孙磊武利平
Owner WUHAN TEXTILE UNIV
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