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Preparation method of high-performance bismuth/bismuth oxide/carbon composite photocatalytic material

A photocatalytic material, bismuth oxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., to achieve improved absorption rate, simple process flow and low cost Effect

Active Publication Date: 2017-06-06
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis of bismuth / metal bismuth / carbon composite photocatalytic materials has not been reported

Method used

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  • Preparation method of high-performance bismuth/bismuth oxide/carbon composite photocatalytic material
  • Preparation method of high-performance bismuth/bismuth oxide/carbon composite photocatalytic material

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: Preparation and naming of samples.

[0022] Add 10 ml of nitric acid into 290 ml of pure water, weigh 48.51 g (0.1 mol) of bismuth nitrate pentahydrate and add it to the nitric acid solution, and sonicate for 2 hours. Under vigorous stirring, 29.22 g (0.1 mol) of ethylenediaminetetraacetic acid was added to the solution, ammonium hydroxide was added to adjust the pH to 6.5, and the suspension was stirred until a clear and transparent EDTA-Bi solution was obtained. Most of the water was evaporated at 60°C using a rotary evaporator. After drying at 120℃ for 72h, EDTA-Bi was obtained as the preparation precursor of bismuth / bismuth oxide / carbon composite photocatalyst. Weigh 5 grams of the precursor and transfer it to a ceramic crucible and heat it in air for 2 hours to 300°C, 400°C, 500°C, and 600°C respectively, and the heating rate is controlled at 4°C per minute. The samples are recorded as 300, 400, 500, and 600, respectively.

Embodiment 2

[0023] Example 2: The ability of the prepared sample to degrade 2,4-dichlorophenol (2,4-DCP).

[0024] In order to investigate the degradation ability of the composite photocatalyst bismuth / bismuth oxide / carbon to colorless phenyl pollutants, 2,4-dichlorophenol was used as the target probe molecule to investigate its activity. The photocatalytic activity of the as-prepared samples was characterized by the degradation of 2,4-DCP. figure 1 a and 1b are the apparent rate constants (λ > 420 nm) and simulated sunlight irradiation for the visible light photocatalytic degradation of 2,4-DCP. It is obvious that sample 400 has the highest photocatalytic activity and organic-inorganic complexation of all samples, and the preparation method of calcination has higher photocatalytic activity than that of bismuth oxide (λ>420nm) under simulated sunlight and visible light irradiation. Compared with bismuth oxide (λ>420nm) under simulated sunlight and visible light irradiation, sample 400 ha...

Embodiment 3

[0025] Embodiment 3: Optical property characterization of samples

[0026] A Hitachi U-3900 UV-Vis spectrophotometer was used to measure BaSO 4 As a reference, the scanning wavelength range is: 200-800nm, the slit width is 2nm, and the scanning speed is 600nm / min to detect the change of the optical properties of the sample. Changes in the electronic properties lead to changes in the photophysical properties of the material, resulting in changes in the shape and intensity of the spectrum. figure 2 It is the ultraviolet diffuse reflectance spectrum of pure bismuth oxide and bismuth / bismuth oxide / carbon composite photocatalyst. Sample 300 exhibits strong absorption in the UV and visible region due to the large amount of residual organic carbon. Sample 400 has a broad visible band absorption, also due to residual organic carbon. In addition, metal Bi can also enhance the visible light absorption of samples 300 and 400. As the preparation temperature increases, the absorption ...

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Abstract

The invention provides a preparation method of a bismuth / bismuth oxide / carbon composite material by utilizing organic-inorganic complexation and calcination. In a degradation process of 2,4-dichlorophenol, a novel composite photocatalyst presents higher photocatalytic activity than pure bismuth oxide under same sunlight and visible light irradiation simulation conditions. The improved photocatalytic activity attributes to smaller particle size and more active sites. What is more important, a surface plasma resonance effect of bismuth can improve light absorption and promote photogenerated charge separation. In addition, carbon in a sample can improve light absorption and promote photogenerated carrier migration. Therefore, a photocatalytic property of the material can be improved. What is more important, the preparation method provides a novel clue for preparing a small-particle-size metal / metal oxide / carbon composite material.

Description

technical field [0001] The invention relates to the preparation of a high-performance bismuth / bismuth oxide / carbon composite photocatalytic material, in particular to a method for preparing a small-diameter bismuth / bismuth oxide / carbon composite material by using organic-inorganic complexation and calcining. Background technique [0002] With the development of the dye industry, the wastewater produced by it has become one of the most important sources of water pollution. At home and abroad, various methods have been used to remove dye molecules in water, among which photocatalysts are widely used because of their energy-saving, high-efficiency, stable properties, and thorough degradation of pollutants. [0003] Traditional titanium dioxide, zinc oxide and bismuth phosphate are the most widely used photocatalysts, which can efficiently degrade a variety of toxic organic compounds, but their wide bandgap (about 3.2eV) makes them only respond to ultraviolet light and not to su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18C02F1/30C02F101/34
CPCC02F1/30B01J23/18C02F2101/34B01J35/39Y02W10/37
Inventor 王瑞婷郝强陈代梅陈通郝思濛丁浩
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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