Method for preparing PEG modified g-C3N4-Cu2O compound catalyst and application thereof

A composite catalyst, PEG-400 technology, is applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc. The effect of photocatalytic performance, good crystallinity and large specific surface area

Active Publication Date: 2017-09-01
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for preparing PEG modified g-C3N4-Cu2O compound catalyst and application thereof
  • Method for preparing PEG modified g-C3N4-Cu2O compound catalyst and application thereof
  • Method for preparing PEG modified g-C3N4-Cu2O compound catalyst and application thereof

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preparation example Construction

[0032] The embodiment of the present invention uses PEG to modify g-C 3 N 4 -Cu 2 A preparation method of O composite catalyst, the method includes the following steps:

[0033] Obtain a first solution including Cu in a dissolved state 2+ And PEG-400;

[0034] Add protonated g-C to the first solution 3 N 4 , Stirring, sonication to obtain a suspension;

[0035] Add xylitol to the suspension under stirring, adjust the pH to 10-12, and stir to obtain a mixed solution;

[0036] Heat the mixed solution to 150-200°C in a high-pressure reaction vessel and react at a constant temperature for 25-35 hours to obtain a reactant;

[0037] Separating the cooled reactant from solid and liquid, washing, and vacuum drying to obtain a solid product;

[0038] The solid product is heated to 150-250°C under the protection of the atmosphere and kept at a constant temperature for 1h-3h to prepare g-C 3 N 4 -Cu 2 O composite catalyst.

[0039] g-C 3 N 4 It has good chemical stability and high temperature stabil...

Embodiment 1

[0046] Raw materials and reagents

[0047] Dicyandiamine (C 2 H 4 N 4 ), copper sulfate pentahydrate (CuSO 4 ·5H 2 O), sodium hydroxide (NaOH) and hydrochloric acid (HCl) are all 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) are analytical grade (AR), purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0048] g-C 3 N 4 Preparation

[0049] 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 lid, and put the crucible into the muffle furnace, program it to 550℃ at a heating rate of 2k / min in an air atmosphere, and keep it warm for 4h. After cooling, the obtained yellow powder was ground for 30 minutes, and the obtained preliminary product was ground for use. Mix 10ml of concentrated sulfuric acid into a 50ml flask, stir at room temperature for 8h, and ultrasonic for 1h. The stirred mixture...

Embodiment 2

[0053] The raw materials and reagents are similar to those in Example 1, and will not be repeated.

[0054] g-C 3 N 4 Preparation

[0055] 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 lid, and put the crucible in the muffle furnace, program it to 500℃ at a heating rate of 1k / min in an air atmosphere, and keep it warm for 5h. After cooling, the obtained yellow powder was ground for 30 minutes, and the obtained preliminary product was ground for use. Mix 10ml of concentrated sulfuric acid into a 50ml flask, stir at room temperature for 6h, and ultrasonic for 2h. The stirred mixture is slowly poured into 100ml of deionized water while stirring. The milky white suspension obtained was centrifuged at 3000 rpm for 10 min and washed with deionized water. Dry at 80°C. Weigh the acidified g-C 3 N 4 0.4g is poured into a 200ml flask, heated to reflux at 50℃ for 8h, filtered and washed with s...

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Abstract

The invention provides a method for preparing a PEG modified g-C3N4-Cu2O compound catalyst and an application thereof. The method comprises the following steps: preparing a first solution including dissolved Cu<2+> ions and PEG-400; adding protonated g-C3N4 into the first solution, stirring, and performing ultrasonic treatment to obtain a suspension liquid; adding xylitol into the suspension liquid under a stirring state, adjusting the pH value to 10-12, and stirring to obtain a mixed liquid; heating the mixed liquid to 150-200 DEG C in a high-pressure reaction container, reacting at constant temperature for 25-35 hours, and naturally cooling to obtain a reacting product; and separating solid and liquid of the cooled reacting product, washing, and drying in vacuum to obtain a solid product; and heating the solid product to 150-250 DEG C under the protection of an inert gas atmosphere, and keeping constant temperature for 1-3 hours to obtain the g-C3N4-Cu2O compound catalyst. The compound catalyst has stronger visible light absorbability, reinforced photocatalytic performance and reinforced stability.

Description

Technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a modified g-C with PEG 3 N 4 -Cu 2 Preparation method and application of O composite catalyst. Background technique [0002] With the rapid development of modern industry, fossil energy sources such as media, oil, and natural gas have been over-exploited and utilized, leading to serious energy crisis and environmental pollution problems. Therefore, it is urgent to find a low-energy-consumption environmental pollution control technology. As a clean and cheap renewable energy, solar energy is of great significance to its development and utilization. As an effective method, photocatalysis technology has produced good results in the treatment of environmental pollutants. The use of solar photocatalytic semiconductor photocatalysts to control environmental pollutants is expected to solve the energy crisis and environmental problems faced by society. Nano photocatalysi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/38C02F101/34
Inventor 李东亚夏东升徐海明左诗雨廖伟曹刚袁向娟孙磊武利平
Owner WUHAN TEXTILE UNIV
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