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A preparation method of bismuth silicate powder photocatalyst

A technology of photocatalyst and bismuth silicate, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, silicon compounds, etc., can solve the problems of unable to adsorb organic matter degradation reactions, unable to solve catalyst separation, limited specific surface area, etc., to achieve benefit The effects of industrialization promotion, low requirements for reaction devices, and simple preparation process

Inactive Publication Date: 2008-04-09
BEIJING NORMAL UNIVERSITY
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  • Description
  • Claims
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Problems solved by technology

[0006] The above work has successfully realized the artificial synthesis of bismuth silicate powder, and the method is relatively mature and stable, but the obtained bismuth silicate materials are all nano-powders with small particle size, which still cannot solve the problem of catalyst separation from water; and The specific surface area of ​​these materials is limited, and they cannot absorb a large amount of organic matter in the water body for degradation reactions. Therefore, their structure and shape need to be further improved so that they can better serve the water body purification industry.

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  • A preparation method of bismuth silicate powder photocatalyst
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  • A preparation method of bismuth silicate powder photocatalyst

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Embodiment 1

[0023] Weigh 4.6 grams of P123 block copolymer surfactant, and dissolve it in 50 milliliters of acetic acid (CH 3 COOH) to form a solution with a concentration of 0.016 mol / liter, stirring continuously until dissolved, then adding 17 grams of bismuth nitrate pentahydrate (Bi(NO 3 ) 3 )·5H 2 O), after dissolving completely, add 0.52 gram of ethyl orthosilicate (Si(OC) dropwise 2 h 5 ) 4 ), the molar ratio of the two is 12:1. Stir vigorously to form a homogeneous and stable sol. Under the condition of stirring, the sol was aged at room temperature for 3 hours, and a small amount of turbid particles appeared, which was the silicon-bismuth composite oxide gel, and then moved to an autoclave for further crystallization at 150°C for 24 hours. The composite oxide gel was precipitated, washed, filtered, evaporated and dried at 120°C to obtain the precursor powder. The obtained precursor powder was calcined in an air atmosphere at a temperature of 550° C. for 3 hours to obtain a...

Embodiment 2

[0025] 7.75 g of F108 block copolymer surfactant was dissolved in 50 ml of acetic acid to form a solution with a concentration of 0.01 mol / liter. Add 16.95 grams of bismuth nitrate pentahydrate to dissolve, add 0.34 grams of methyl orthosilicate (Si(OCH 3 ) 4 ), the molar ratio of the two is 12:1. Stir vigorously to form a homogeneous sol. After aging for 3 hours, move the aforementioned sol to an autoclave, crystallize at 140°C for 36 hours, take it out, wash it, filter, evaporate and dry at 120°C, and roast it in an air atmosphere at 450°C for 3 hours to obtain silicic acid Bismuth powder photocatalyst, denoted as 2# sample. Its specific surface area is 4.6 m2 / g.

Embodiment 3

[0027] 2.3 grams of P123 block copolymer surfactant was dissolved in 50 milliliters of acetic acid to form a solution with a concentration of 0.008 mol / liter. Add 17.5 g of bismuth nitrate hydrate until completely dissolved, then add 0.52 g of tetraethyl orthosilicate dropwise to form a uniform sol. After aging for 3 hours, the sol was moved to an autoclave, taken out after crystallization at 160°C for 48 hours, washed, filtered, evaporated and dried at 130°C, and the obtained precursor powder was roasted at 380°C for 3 hours to obtain Bismuth silicate powder photocatalyst is recorded as 3# sample. Its specific surface area was 10.1 m2 / g.

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Abstract

The invention relates to a preparation method for bismuth silicate powder photocatalyst. At first pentahydrate bismuth nitrate and active agent on the surface of a segmented copolymer are dissolved in acetic acid to form uniform clear solution, and then silicate ester is added into solution containing bismuth according that the mol ratio of bismuth to silicon is equal to 12:1, and is fully mixed to form uniform sol. After aging, the solution is moved into an autoclave to be hermetically crystallized, so as to obtain the composite oxide gel of the bismuth and the silicon, and after being filtered, cleaned, and dried, at last precursor powder is roasted in the air environment, namely, the bismuth silicate powder photocatalyst of the granularity with micron size is obtained. The invention can stably and uniformly obtain the bismuth silicate powder with good crystallinity under the lower temperature, and the granularity of the photocatalyst is larger, thereby being convenient for being separated from a water body to facilitate the recovery and the operation, the photocatalyst has highly effective photocatalytic activity, and is applicable for photocatalytic degrading organic pollutants.

Description

technical field [0001] The invention relates to a preparation method of a bismuth silicate powder photocatalyst, belonging to the technical field of environmental photocatalytic water treatment. Background technique [0002] Bismuth silicate crystal is a wide-bandgap, high-resistivity non-ferroelectric cubic semiconductor. It has various effects such as electro-optic, photoconductive, photorefractive, piezoelectric, acousto-optic, optical rotation and Faraday rotation, and is a promising optical information material. Using the electro-optic and photoconductive properties of bismuth silicate crystals, many nonlinear optical transformations can be realized with low-power lasers at room temperature. Bismuth silicate crystal is one of several photorefractive materials with the highest sensitivity and the fastest response speed obtained so far, so it is widely used in real-time optical information processing and optical operation calculation technologies. [0003] Bismuth silic...

Claims

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Application Information

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IPC IPC(8): B01J23/18C01B33/20
Inventor 牛军峰殷立峰沈珍瑶张哲赟蒋国翔
Owner BEIJING NORMAL UNIVERSITY
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