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Preparation method of silica-titania composites with different morphologies

A composite material, silicon dioxide technology, applied in the directions of silicon dioxide, titanium dioxide, silicon oxide, etc., can solve the problems of uncontrollable reaction, complex polymerization system, uneven molecular weight distribution, etc., and achieve strong photocatalytic degradation ability and simple polymerization system. , the effect of low price

Active Publication Date: 2017-12-22
SHANDONG SITO BIO TECHNOLOGY CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, traditional methods for preparing SiO 2 -TiO 2 When, the living controllable radical polymerization method and its related methods are generally used for SiO 2 Modification, this modification method has the disadvantages of uncontrollable reaction, uneven molecular weight distribution and complex polymerization system

Method used

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  • Preparation method of silica-titania composites with different morphologies
  • Preparation method of silica-titania composites with different morphologies
  • Preparation method of silica-titania composites with different morphologies

Examples

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preparation example Construction

[0043] refer to figure 1 , which shows a flow chart of a method for preparing a silica-titania composite material with different morphologies described in an embodiment of the present invention, the method comprising the following steps:

[0044] Step 101, spherical nano-SiO 2 (Silicon dioxide) preparation: using the Stober method, tetraethyl orthosilicate is added to absolute ethanol and ammonia water to generate spherical nano-SiO 2 .

[0045] Step 102, SiO 2 -Preparation of KH570: Use KH570 (3-methacryloxytrimethoxysilane) for the spherical nano-SiO 2 Carry out modification treatment, obtain described SiO 2 -KH570.

[0046] In this step, the silane coupling agent KH570 on SiO 2 Surface modification to introduce double bonds into SiO 2 s surface.

[0047] Step 103, SiO 2 - Preparation of POEOMA: the SiO 2 - KH570 was dissolved in DMF (DMF), and ammonium persulfate was added as an initiator, and the resulting POEOMA (polyethylene glycol monomethyl ether methyl metha...

Embodiment 1

[0079] (1) Put a 250mL three-neck flask in an oil bath, add 10mL of distilled water, 8mL of ammonia water with a mass fraction of 25% to 28%, and 100mL of absolute ethanol, heat up to 40°C, and stir at a speed of 300r / min. Under the condition of stirring, add TEOS dropwise to the above mixture, add 10mL of TEOS in total, stir and react for 12h, after the reaction is completed and cooled to room temperature, the obtained solution with milky white precipitate is centrifuged, and distilled water is used to The milky white precipitate was washed repeatedly with ethanol for 4 times, and the obtained milky white precipitate was vacuum-dried at 70°C for 12 hours to obtain SiO with a particle size of 80-120nm. 2 nanospheres.

[0080] In practice, the amount of TEOS affects the synthesized SiO 2 When the amount of TEOS is too much, the hydrolysis of TEOS is not complete, resulting in waste of raw materials; when the amount of TEOS is too small, SiO with the required particle size cann...

Embodiment 2

[0091] The difference from Example 1 is that in step (4) of this example, the amount of TBT is 1.0mL, other conditions are the same as in Example 1, and finally SiO with a cauliflower-pomegranate shape is obtained. 2 -TiO 2 Composite material, marked ST-2.

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Abstract

The invention provides a preparation method of silicon dioxide-titanium dioxide composite materials in different shapes. The method comprises the following steps: preparation of spherical nano SiO2, preparation of SiO2-KH570, preparation of SiO2-POEOMA, preparation of SiO2-POEOMA-TiO2, and preparation of SiO2-TiO2. According to the embodiment of the invention, by using a solution polymerization process to modify the SiO2, the method has the advantages of simple polymerization system and controllable reaction, and the modified substance is uniformly distributed on the surface and inside of the SiO2, thereby preparing the uniform-particle-size high-dispersity intermediate product SiO2-POEOMA. Meanwhile, the TBT consumption is controlled to prepare the SiO2-TiO2 composite materials in different shapes (cauliflower-shaped, cauliflower-pomegranate-shaped and pomegranate-shaped). The TiO2 in the SiO2-TiO2 composite materials in three different shapes has the anatase crystal form structure; and since the titanium dioxide in such a crystal form structure has high photocatalytic degradation capacity for organic dyes, the SiO2-TiO2 composite materials prepared according to the method have favorable application prospects in the aspect of photocatalytic degradation of organic dyes.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and in particular relates to a method for preparing silica-titania composite materials with different shapes. Background technique [0002] Nanomaterials have attracted more and more attention because of their special properties such as small size effect, surface interface effect, quantum size effect, macroscopic quantum tunnel effect, and special optical and electrical properties. Nano-silicon dioxide is one of the earliest nano-materials used so far. [0003] In recent years, with core-shell structure, functionalized SiO 2 It has attracted widespread attention due to its many potential uses in industry. Titanium dioxide (TiO 2 ) is an important multifunctional inorganic material, because of its advantages of non-toxicity, low cost and high chemical stability, as well as unique photocatalytic properties, excellent color effects and ultraviolet shielding functions, it is widely used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053C01B33/12
CPCC01G23/053C01P2002/72C01P2002/82C01P2002/88C01P2004/03C01P2004/82
Inventor 陈兴芬仝令华孙福锁
Owner SHANDONG SITO BIO TECHNOLOGY CO LTD
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