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A mesoporous coco 3 /g-c 3 no 4 Preparation method of composite material

A composite material, g-c3n4 technology, applied in the field of preparation of mesoporous CoCO3/g-C3N4 composite materials, can solve the problems of insufficient utilization of visible light, high carrier recombination rate, weak light absorption ability, etc. Catalytic hydrogen production performance, simple production process, and improved separation effect

Active Publication Date: 2021-11-23
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the monomer g-C 3 N 4 The photocatalytic activity of the photocatalyst is weak, because its carrier recombination rate is high, the agglomeration is serious, and the light absorption ability at a longer wavelength is not strong, and the utilization rate of visible light is insufficient, which limits its use as a photocatalyst in energy and environment. Applications

Method used

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  • A mesoporous coco <sub>3</sub> /g-c <sub>3</sub> no <sub>4</sub> Preparation method of composite material
  • A mesoporous coco <sub>3</sub> /g-c <sub>3</sub> no <sub>4</sub> Preparation method of composite material
  • A mesoporous coco <sub>3</sub> /g-c <sub>3</sub> no <sub>4</sub> Preparation method of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: CoCO 3 / g -C 3 N 4 Preparation of composite materials

[0032] (1) Weigh urea, dry it in an oven at 80 °C for 24 h, grind it evenly, put it into a crucible with a cover, and place it in a muffle furnace at 2.5 °C min -1 Heating rate of , heating from room temperature to 550 ℃, holding for 4 h; in 1 mol L -1 Stir in nitric acid for 12 h, perform suction filtration, wash with deionized water until neutral, and dry in an oven for 24 h; grind evenly and finely, spread it in a square porcelain boat, wrap it in tin foil, and put it in a muffle furnace at 5°C min -1 Heating rate of , heating from room temperature to 500 ℃ for 4 h, to obtain g-C 3 N 4 catalyst of light.

[0033] (2) Weigh 0.5818 g of cobalt nitrate hexahydrate, dissolve it in a mixed solution consisting of 7 ml of glycerol and 23 ml of distilled water and stir thoroughly for 30 min, add 0.5 g of urea and stir for 30 min until the urea is fully dissolved, and put it into the capacity In a 50ml...

Embodiment 2

[0036] Example 2: Mesoporous CoCO 3 / g -C 3 N 4 Performance Analysis of Composite Materials

[0037] In this example, X-ray diffraction (XRD), scanning electron microscopy (SEM), N 2 Adsorption-desorption isotherm, BJH pore size distribution, instantaneous photocurrent response (I-t) and other means for the mesoporous CoCO prepared in Example 1 3 / g -C 3 N 4 Composites are tested for performance. g-C 3 N 4 Catalyst and CoCO 3 A single catalyst was used as a reference for comparison. CoCO 3 The preparation method of the monomer catalyst is to use 0.1 g of the CoCO obtained in step (2) of Example 1 3 The precursor was directly dissolved in 30 ml ethanol solution and stirred for 1 h, then dried in an oven at 80 °C for 12 h, and the solid product was spread in a square porcelain boat, wrapped tightly with tin foil, and placed in a muffle furnace for 2 °C min -1 The heating rate was heated from room temperature to 300 °C and kept for 2 h. After cooling to room temperatu...

Embodiment 3

[0044] Example 3: Mesoporous CoCO 3 / g -C 3 N 4 Preparation of composite materials

[0045] Weigh 0.5818 g of cobalt nitrate hexahydrate, dissolve in a mixed solution consisting of 7 ml of glycerol and 23 ml of distilled water and stir thoroughly for 30 min, add 2 g of urea and stir for 30 min until the urea is fully dissolved; put it into the reaction kettle, Hydrothermal reaction at 190 °C for 20 h, after natural cooling to room temperature, washing with deionized water and ethanol three times, respectively, and drying in an oven at 50 °C to obtain CoCO 3 Precursor;

[0046] Weigh 0.3 g of the g-C obtained in step (1) of Example 1 3 N 4 , dissolved in 60 ml ethanol solution and ultrasonically dispersed for 1 h, and added 0.009 g of CoCO obtained in step (2) 3 The precursor was stirred for 1 h and dried in an oven at 70 °C for 14 h. The solid product was spread in a square porcelain boat, wrapped tightly with tin foil, and then placed in a muffle furnace for 2.5 °C min....

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Abstract

The invention belongs to the field of nanomaterial synthesis, in particular to a mesoporous CoCO 3 / g‑C 3 N 4 Methods for the preparation of composite materials. The present invention utilizes a one-step hydrothermal method in CoCO 3 Surface modification of hexahedral nanomaterials g‑C 3 N 4 Construction of 3D / 2D Structured Mesoporous CoCO 3 / g‑C 3 N 4 Composite material, mesoporous CoCO 3 Hexahedral nanomaterial pair g‑C 3 N 4 The modification significantly improves the separation effect of the photogenerated charge carriers in the composite material, which significantly enhances the light-harvesting ability of the composite material and reduces the monomer g‑C 3 N 4 bandgap width, exhibits excellent photocatalytic hydrogen production performance under visible light conditions; the present invention uses CoCO 3 3D materials on monomer g‑C 3 N 4 The surface is modified, the manufacturing process is simple, the controllability is strong, the mass production is convenient, the energy consumption is reduced, the material is easy to obtain, the cost is low, and there is no pollution, which meets the requirements of environmental friendliness. Open up a new way for the sustainable development of energy.

Description

technical field [0001] The invention belongs to the field of nanomaterial synthesis, in particular to a mesoporous CoCO 3 / g -C 3 N 4 Methods of preparation of composite materials. Background technique [0002] The problem of energy shortage and environmental pollution is becoming more and more serious, and the development of clean and efficient renewable energy is particularly critical. Solar energy is renewable energy. It is rich in resources, can be used for free, does not need to be transported, has no pollution to the environment, and has great prospects in development and utilization. For example, using photocatalysts to capture sunlight to split water to produce hydrogen is a promising strategy from the perspective of energy and sustainable development. However, the design and preparation of photocatalyst materials still need to be continuously improved and developed. [0003] In recent years, carbon nitride materials have become a research hotspot in the field ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24C01B3/042C01B2203/0277C01B2203/1052B01J35/39Y02E60/36
Inventor 董红军肖梦雅李春梅宋宁洪士欢左延朱达强
Owner JIANGSU UNIV
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