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A kind of cu/cds/graphene composite photocatalyst and its preparation method and application

A graphene composite and photocatalyst technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. and adverse effects on human health, to achieve the effects of environmental protection in the preparation process, improved hydrogen production capacity, and improved stability

Active Publication Date: 2021-08-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Investigation on graphene and Pt co-modified CdS nanowires with enhanced photocatalytic hydrogen evolution activity under visible light irradiation (Muhan Cao, Peifang Wang, Yanhui Ao, Chao Wang, Jun Hou and Jin Qian, Dalton Transactions. 2015, 44(372): 16 ) provides a method for preparing a composite photocatalyst in which metal platinum and graphene are used to modify CdS. The method uses concentrated sulfuric acid and potassium permanganate to oxidize graphite to obtain graphene oxide, and uses graphene oxide, cadmium nitrate and sulfur Urea is used as a raw material to obtain graphene-CdS nanowires through hydrothermal reaction, and then metal platinum is deposited by photoreduction. Although the catalyst has a high photocatalytic effect, the process involves the use of strong corrosive reagents, which is harmful to the environment and human health. cause adverse effects, and the H in the raw material 2 PtCl 6 The cost is high, which is not conducive to the industrial production of photocatalysts

Method used

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  • A kind of cu/cds/graphene composite photocatalyst and its preparation method and application
  • A kind of cu/cds/graphene composite photocatalyst and its preparation method and application
  • A kind of cu/cds/graphene composite photocatalyst and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of graphene

[0047] The eucalyptus biochar was crushed with a pulverizer, and sieved with a 300-mesh stainless steel mesh sieve to obtain the powder of the eucalyptus biochar. Weigh 2 g of eucalyptus biochar powder and 2 g of potassium acetate into a mortar and grind for 30 min to obtain mixture 1. Transfer the mixture 1 to a tube furnace for activation under the condition of nitrogen gas, from room temperature to 600°C at a rate of 5°C / min, keep it for 3 hours, then raise the temperature to 900°C at a rate of 1°C / min, and keep it for 5 hours , naturally cooled to room temperature. Take out the reactant, pickle the reaction product with 0.1mol / L dilute hydrochloric acid to make the pH less than 7, then wash repeatedly with deionized water and absolute ethanol until neutral, and centrifuge the obtained precipitate in an oven at 80°C After drying for 12 hours, the graphene product is obtained.

[0048] (2) Preparation of CdS / graphene composite photocat...

Embodiment 2

[0057] (1) Preparation of graphene

[0058] The eucalyptus biochar was crushed with a pulverizer, and sieved with a 300-mesh stainless steel mesh sieve to obtain the powder of the eucalyptus biochar. Weigh 2 g of eucalyptus biochar powder and 6 g of potassium carbonate into a mortar and grind for 30 min to obtain mixture 1. Transfer the mixture 1 to a tube furnace for activation under the condition of nitrogen gas, from room temperature to 500°C at a rate of 1°C / min, keep it for 1h, then raise the temperature to 1100°C at a rate of 3°C / min, and keep it for 1h , naturally cooled to room temperature. Take out the reactant, pickle the reaction product with 1mol / L dilute hydrochloric acid to make the pH slightly less than 7, then wash repeatedly with deionized water and absolute ethanol until neutral, and centrifuge the obtained precipitate at 90°C in an oven After drying for 12 hours, the graphene product is obtained.

[0059] (2) Preparation of CdS / graphene composite photocat...

Embodiment 3

[0069] (1) Preparation of graphene

[0070] The eucalyptus biochar was crushed with a pulverizer, and sieved with a 300-mesh stainless steel mesh sieve to obtain the powder of the eucalyptus biochar. Weigh 2 g of eucalyptus biochar powder and 10 g of potassium bicarbonate into a mortar and grind for 30 min to obtain mixture 1. Transfer the mixture 1 to a tube furnace for activation under the condition of nitrogen gas, from room temperature to 800°C at a rate of 3°C / min, keep it for 2h, then raise the temperature to 1000°C at a rate of 5°C / min, and keep it for 5h , naturally cooled to room temperature. Take out the reactant, pickle the reaction product with 0.5mol / L dilute hydrochloric acid, make the pH slightly less than 7, then wash repeatedly with deionized water and absolute ethanol until neutral, centrifuge the obtained precipitate at 100°C in an oven Drying in medium for 12h, the obtained graphene product.

[0071] (2) Preparation of CdS / graphene composite photocatalys...

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Abstract

The invention discloses a Cu / CdS / graphene composite photocatalyst and a preparation method and application thereof. The method includes: using potassium metal salt to activate the biochar under programmed temperature control to obtain graphene; ultrasonically dispersing the graphene in water, adding cadmium acetate and thiourea to fully dissolve the mixture to obtain a mixed solution A, and using the mixed solution A for hydrothermal treatment The CdS / graphene composite photocatalyst is obtained by the reaction; the CdS / graphene photocatalyst is taken in the reactor, water, lactic acid and copper acetate solution are added, and then the reactor is evacuated, and copper is deposited by a photo-initiated method to obtain Cu / graphene composite photocatalyst. CdS / graphene composite photocatalyst. The method provided by the invention avoids the use of strong corrosive reagents for preparing graphene oxide, reduces the preparation cost of the photocatalyst by replacing the precious metal with copper, and greatly increases the photocatalytic hydrogen production rate of the photocatalyst obtained by the invention under visible light, and is stable and stable. Sex is also enhanced.

Description

technical field [0001] The invention belongs to the field of photocatalysts, in particular to a Cu / CdS / graphene composite photocatalyst and its preparation method and application. Background technique [0002] The application of photocatalytic technology in sterilization and disinfection, pollutant degradation, carbon dioxide reduction and water splitting to produce hydrogen has attracted the attention of scientists, especially the photocatalytic water splitting to produce hydrogen is an effective way to convert solar energy into chemical energy , and the obtained hydrogen is a kind of clean energy with high calorific value and no pollution of combustion products. [0003] CdS is an inorganic semiconductor photocatalyst with a narrow band gap (2.4eV), which can use visible light to photocatalytically split water to produce hydrogen. Corrosion, which greatly affects its photocatalytic hydrogen production efficiency and its own stability. Therefore, its photocatalytic activi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/04B01J23/72B01J21/18B01J37/10B01J37/34C01B3/04
CPCB01J21/18B01J23/72B01J27/04B01J35/004B01J37/10B01J37/344C01B3/042Y02E60/36
Inventor 曾和平徐志雄
Owner SOUTH CHINA UNIV OF TECH
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