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Preparation method and application of g-C3N4-Cu2O composite catalyst

A composite catalyst, g-c3n4-cu2o technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of photocatalytic efficiency to be improved, to ensure photocatalytic performance, strong Effect of Visible Light Absorptivity

Inactive Publication Date: 2017-09-26
WUHAN TEXTILE UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, 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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  • Preparation method and application of g-C3N4-Cu2O composite catalyst
  • Preparation method and application of g-C3N4-Cu2O composite catalyst
  • Preparation method and application of g-C3N4-Cu2O composite catalyst

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preparation example Construction

[0035] Embodiments of the present invention g-C 3 N 4 -Cu 2 The preparation method of O composite catalyst comprises the steps:

[0036] providing a first solution comprising Cu in a dissolved state 2+ ;

[0037] Add protonated g-C to the first solution 3 N 4 , stirred, sonicated to obtain a suspension;

[0038] Add xylitol to the suspension under stirring, adjust the pH value to 10-12, and stir to obtain a mixed solution;

[0039] 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;

[0040] The solid-liquid separation of the reactant after cooling to obtain a solid product, washing, and vacuum drying;

[0041] 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 obtain g-C 3 N 4 -Cu 2 O composite catalyst.

[0042] Graphite carbon nitride (g-C 3 N 4 ) is a typical n-type semiconductor mate...

Embodiment 1

[0047] Raw Materials and Reagents

[0048] 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.

[0049] Protonated g-C 3 N 4 preparation of

[0050] After heating dicyandiamide to 550°C at a heating rate of 2K / min, calcining for 4 hours, cooling, and grinding the obtained light yellow powder; adding concentrated sulfuric acid to the ground powder for mixing, stirring, and ultrasonication to obtain a mixture; The mixture is mixed with water and stirred to obtain a milky white suspension, which is centrifuged, washed and dried to obtain acidified g-C 3 N 4 ; The acidified g-C 3 N 4 Reflux at 65°C for 6h, filter with suction, wash and dry to obtain g...

Embodiment 2

[0054] Protonated g-C 3 N 4 preparation of

[0055] After heating dicyandiamide to 500°C at a heating rate of 1K / min, calcining for 5 hours, cooling, and grinding the obtained light yellow powder; adding concentrated sulfuric acid to the ground powder for mixing, stirring, and ultrasonication to obtain a mixture; The mixture is mixed with water and stirred to obtain a milky white suspension, which is centrifuged, washed and dried to obtain acidified g-C 3 N 4 ; The acidified g-C 3 N 4 Reflux at 50°C for 8h, filter with suction, wash and dry to obtain g-C 3 N 4 .

[0056] g-C 3 N 4 -Cu 2 Preparation of O composite photocatalyst

[0057] The g-C 3 N 4 grow to Cu 2 O surface, the specific steps are as follows: first, 1.25g CuSO 4 ·5H 2 O was added to 40mL deionized water, when the solution turned dark blue, continue to add g-C to the above solution 3 N 4 The powder was magnetically stirred for 2 hours and then ultrasonically continued for 2 hours to obtain a hom...

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Abstract

The invention mainly aims at providing a preparation method and application of a g-C3N4-Cu2O composite catalyst. The preparation method comprises the following steps: providing a first solution, wherein the first solution contains Cu<2+> in a dissolved state; adding protonated g-C3N4 into the first solution, stirring, and carrying out ultrasonic treatment to obtain suspension; adding xylitol into the suspension in a stirring state, adjusting the pH value to 10-12, and stirring to obtain mixed liquid; heating the mixed liquid to 150-200 DEG C in a high-pressure reaction container, and carrying out a reaction for 25-35h at the constant temperature to obtain reactants; cooling the reactants and then carrying out solid-liquid separation on the cooled reactants to obtain a solid product, cleaning, and carrying out vacuum drying; heating the solid product up to 150-250 DEG C under the condition of gas protection, and maintaining the constant temperature for 1-3h to obtain the g-C3N4-Cu2O composite catalyst. The g-C3N4-Cu2O composite catalyst has higher visible absorption capacity and good photocatalytic performance. The g-C3N4-Cu2O composite catalyst can be used for carrying out catalytic treatment on organic pollutants in waste water in presence of visible light, and is remarkable in degradation effect and relatively stable.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a g-C 3 N 4 -Cu 2 Preparation method and application of O composite catalyst. Background technique [0002] Semiconductor photocatalysis technology is one of the most likely methods to eliminate environmental pollution with the help of sunlight. So far, most studies have focused on TiO 2 , which is mainly due to the TiO 2 It has become the most important photocatalytic material due to its excellent chemical stability, light corrosion resistance, low price and good environmental compatibility. However, TiO 2 The bandgap width is 3.2eV, which is a wide bandgap semiconductor, and can only absorb ultraviolet light, which accounts for 3%-5% of the solar spectrum and has a wavelength less than 390nm, thus limiting its utilization of sunlight. In order to effectively utilize sunlight, finding highly efficient visible light-based catalysts has become an important task in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30C02F101/34C02F101/36C02F101/38
CPCC02F1/30B01J27/24C02F2101/30C02F2101/36C02F2101/34C02F2101/40C02F2101/38C02F2305/10B01J35/39Y02W10/37
Inventor 李东亚夏东升徐海明廖伟左诗雨曹刚袁向娟孙磊
Owner WUHAN TEXTILE UNIV
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