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Method for preparing cobalt-doped improved beta-bismuth oxide photocatalyst

A technology of photocatalyst and bismuth oxide, which is applied in the field of environmental science and engineering to achieve the effects of high catalytic activity, loose and porous structure, and high efficiency

Inactive Publication Date: 2011-04-06
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few research reports on the artificial synthesis of cobalt-doped modified Beta-bismuth oxide photocatalyst powders. At the same time, in order to effectively separate the catalyst from water, it is necessary to further improve its structure and morphology and improve the recovery of photocatalysts. Rate

Method used

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  • Method for preparing cobalt-doped improved beta-bismuth oxide photocatalyst
  • Method for preparing cobalt-doped improved beta-bismuth oxide photocatalyst
  • Method for preparing cobalt-doped improved beta-bismuth oxide photocatalyst

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Embodiment 1

[0023] Take by weighing 9.28 grams of Pluronic P-123 block copolymer surfactant and place it in a beaker, add 100 milliliters of nitric acid (HNO 3 ) solution, stirred by a magnetic stirrer, after the Pluronic P-123 is completely dissolved in nitric acid to form a colorless and transparent solution, add 24 grams of bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O), continue to stir. After the solution is clarified, add 0.87 gram of cobalt nitrate (Co(NO 3 ) 2 ·6H 2(0), continue to stir until cobalt nitrate dissolves completely, and this moment, solution exists with rose red homogeneous sol form. While continuing to stir, the sol was aged at room temperature for about 3 hours to obtain a rose-red precursor solution; the solution was transferred to a stainless steel autoclave lined with polytetrafluoroethylene, and the autoclave was sealed Put it in a vacuum drying oven at 150°C for 24 hours to crystallize; take out the autoclave to cool to room temperature, then take out...

Embodiment 2

[0025] Preparation of precursor step is the same as in Example 1, wherein Pluronic P-123: 9.28g; Nitric acid (2 mol / liter): 100 milliliters; Bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O): 24g; cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O): 0.87 g; calcination temperature 550°C. Recorded as sample 2#.

Embodiment 3

[0027] Precursor preparation step is the same as embodiment 1, wherein Pluronic P-123: 6.96g; Nitric acid (2 mol / liter): 100 milliliters; Bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O): 20.37g; cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O): 0.87 g; calcination temperature 500°C. Recorded as sample 3#.

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Abstract

The invention relates to the field of environmental science and engineering, in particular to a method for preparing a cobalt-doped improved beta-bismuth oxide photocatalyst for degrading organic pollutants in water by means of visible light photocatalytic technology. In the method, the cobalt-doped improved beta-bismuth oxide photocatalyst is synthesized by using a solvothermal method, the molar ratio of bismuth nitrate to cobalt nitrate is controlled at 10:1-16.7:1 during synthesis, and the calcining temperature is controlled at 450-550 DEG C. A visible light source is simulated by using a xenon lamp for a light degradation reaction. The photocatalyst prepared by the method of the invention can remove more than 50% of 2, 4, 6-trichlorophenol (2, 4, 6-TCP) pollutant (10 mg / L concentration) in a water body. Meanwhile, the photocatalyst has simple preparation process, large particle size, convenient recycling, repeated utilization, low manufacturing cost, short period and high efficiency, and thus, the photocatalyst has good industrial application prospect.

Description

technical field [0001] The invention relates to the field of environmental science and engineering, and the content is an investigation of the degradation activity of a cobalt-doped modified Beta-bismuth oxide photocatalyst and a synthesis method thereof, specifically a cobalt that degrades organic pollutants in water by means of visible light catalysis technology. The preparation method of the doped modified Beta-bismuth oxide photocatalyst. Background technique [0002] In recent years, semiconductor-based photocatalytic degradation of organic pollutants has attracted great attention of researchers for providing feasible solutions to many existing and potential environmental problems. There are valence bands and conduction bands in semiconductors. Under the excitation of external factors such as light, the electrons in the valence band absorb energy and jump to the conduction band, thereby generating electrons in the conduction band (e - ), while the valence band loses el...

Claims

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Application Information

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IPC IPC(8): B01J23/843B01J37/00C02F1/30C02F101/30
Inventor 牛军峰包月平殷立峰沈珍瑶
Owner BEIJING NORMAL UNIVERSITY
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