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Method for preparing lanthanum yttrium hafnate-based titanium dioxide composite photocatalyst

A composite photocatalyst and titanium dioxide technology, applied in the direction of protection devices against harmful chemicals, etc., can solve the problem of no lanthanum hafnium yttrium-based titanium dioxide composite photocatalyst photocatalyst, etc., and achieve the effects of good photocatalytic performance, good crystallization, and mild conditions.

Inactive Publication Date: 2011-07-20
上海奇葩环境科技有限公司
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AI Technical Summary

Problems solved by technology

[0007] There is no report on lanthanum hafnate yttrium-based titanium dioxide composite photocatalyst as a photocatalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] a. Preparation of lanthanum yttrium hafnate powder

[0023] Hafnium oxide (HfO 2 , 99.9%) and yttrium oxide (Y 2 o 3 , 99.995%) and lanthanum oxide (La 2 o 3 , 99.99%) as raw material. The three raw materials are weighed according to a certain proportion and put into a ball mill jar, using absolute ethanol and pure zirconia balls as media for ball milling for 12-20 hours, dried at 70-100°C for 5-10 hours, and passed through a 200-mesh sieve to obtain a powder.

[0024] b. Preparation of lanthanum hafnate-yttrium-based titanium dioxide composite photocatalyst

[0025] (1) Weigh a certain amount of titanium tetrachloride (TiCl 4 ) or titanium tetrafluoride (TiF 4 ) was dissolved in deionized water, then a certain amount of lanthanum yttrium hafnate powder was added, and ultrasonically dispersed for 1 hour to make it fully mixed; a suspension was obtained; the mass ratio of lanthanum yttrium hafnate to titanium tetrachloride or titanium tetrafluoride 1:8-40;

[00...

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PUM

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Abstract

The invention discloses a method for preparing a lanthanum yttrium hafnate-based titanium dioxide composite photocatalyst, and belongs to the technical field of photocatalyst preparation. The preparation method comprises the following steps of: (1) preparing lanthanum yttrium hafnate powder by adopting a conventional known method; (2) adding the lanthanum yttrium hafnate powder into titanium tetrachloride or titanium tetrafluoride solution, and dispersing the system into suspension by using ultrasonic wave; (3) placing the suspension in an electron beam generating device, and performing electron beam irradiation of certain dose, wherein the irradiation dose is 70 to 280KGy; (4) sealing the suspension, putting the sealed suspension in a baking oven, and reacting for 20 hours at the temperature of 60 DEG C; and (5) washing, drying and finally obtaining the lanthanum yttrium hafnate-based titanium dioxide composite photocatalyst. The lanthanum yttrium hafnate-based titanium dioxide composite photocatalyst prepared by the method has high photocatalysis activity by detection. Detected by a transmission electron microscope (TEM), nano titanium dioxide crystals are densely and uniformly loaded on a lanthanum yttrium hafnate matrix.

Description

technical field [0001] The invention relates to a preparation method of a lanthanum hafnate yttrium-based titanium dioxide composite photocatalyst, belonging to the technical field of photocatalyst preparation. Background technique [0002] The English name of photocatalyst is: Photocatalyst, which is a compound word of light "Photo" + catalyst "catalyst". Using photocatalyst technology can convert light energy into chemical energy, decompose small organic molecules such as formaldehyde, acetaldehyde, ammonia in the atmosphere and even in the water environment, and decompose them into non-toxic and tasteless carbon dioxide and water, becoming a tool for environmental governance weapon. In essence, a photocatalyst is a semiconductor material with photocatalytic ability. When it is irradiated by light greater than or equal to its forbidden band width, it will excite and generate electrons e- and holes H+. These electrons and holes are photocatalytic reactions. The active sub...

Claims

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Application Information

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IPC IPC(8): B01J23/10A62D3/10
Inventor 欧松吕伟丽
Owner 上海奇葩环境科技有限公司
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