Preparation method of nano silicon dioxide

A technology of nano-silica and silicon dioxide, which is applied in the preparation of nano-silicon dioxide and the preparation of inorganic nano-materials, can solve the problems of high cost, difficult recycling, environmental pollution, etc., and achieve uniform particle size, low-cost raw materials, The effect of low running cost

Active Publication Date: 2013-03-06
CHINA PETROLEUM & CHEM CORP
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  • Abstract
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Problems solved by technology

However, this method needs to use a large amount of organic matter in the preparatio

Method used

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  • Preparation method of nano silicon dioxide
  • Preparation method of nano silicon dioxide
  • Preparation method of nano silicon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 54.6mg alanine (6.1×10 -4 mol) was dissolved in 41.4 g of distilled water (2.3 mol), 3.13 g of tetraethyl orthosilicate (0.015 mol) was added, and the whole reaction system was stirred at 50-60° C. for 24 hours to obtain a suspension of silica seed crystals.

[0033]The temperature of the system is controlled by a constant temperature tank at 25°C, and 2ml of the suspension is measured, and distilled water is added to 44ml (the amount of the substance is 2.44mol), that is, it is diluted 22 times. 2.96g triblock polymer P123 (molar mass 5800g / mol, substance amount 5.1×10 -4 mol), stirred for 20min to dissolve it completely, then added 6.24g of sodium silicate nonahydrate (equivalent to 0.022mol of sodium silicate), and stirred vigorously for 30min to form a homogeneous solution.

[0034] Keep stirring, and add 50wt% sulfuric acid dropwise to the homogeneous solution at 20-30° C. until the pH of the solution is 7 to form a silica gel. The obtained silica gel was aged in...

Embodiment 2

[0036] The mass of triblock polymer P123 added in the reaction system is 1.48g (2.55×10 -4 mol), all the other steps are the same as the method described in Example 1. The specific surface area and pore structure data of the samples are listed in Table 1.

Embodiment 3

[0038] 54.6 mg of alanine was dissolved in 41.4 g of distilled water, 3.13 g of ethyl orthosilicate was added, and the whole reaction system was stirred at 50-60°C for 24 hours to obtain a suspension of silica seed crystals.

[0039] The temperature of the system is controlled by a constant temperature tank at 25°C, and 2ml of the suspension is measured and diluted 22 times with distilled water. Add 0.093g cetyltrimethylammonium bromide (2.6×10 -4 mol), stirred for 20min to dissolve it completely, then added 6.24g of sodium silicate, stirred vigorously for 30min to form a homogeneous solution. Keep stirring, and add 50 wt% sulfuric acid drop by drop until the pH of the solution is 7 to form a silica gel. The obtained silica gel was aged in a sealed environment for 18 hours, and the aging temperature was 25°C. The aged gel is filtered, washed and dried, and then calcined at 550°C to obtain the product. The specific surface area and pore structure data of the samples are list...

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Abstract

The invention relates to a preparation method of nano silicon dioxide, which comprises the following steps: carrying out hydrolytic condensation on tetraethylorthosilicate by using alanine as a structure guide agent to obtain a silicon dioxide crystal seed suspension; preparing a low-concentration crystal seed suspension; adding sodium lauryl sulfate and sodium silicate; and slowly and dropwisely adding a sulfuric acid solution to regulate the pH value of the system so that the silicon dioxide generated by the hydrolytic condensation of silicate grows on the external surface of the silicon dioxide crystal seed, thereby obtaining the silicon dioxide spheres. Nano silicon dioxide with different specific areas and pore structures can be prepared by regulating the surfactant concentration, aging temperature and roasting temperature; and the specific area is 193-305 m<3>/g, the pore volume is 1.25-1.68 cm<3>/g, and the pore size is 17-34nm. Compared with the existing preparation method, the nano silicon dioxide prepared by the method provided by the invention has the advantages of more uniform particle size and more centralized pore size distribution, thereby having favorable application prospects.

Description

technical field [0001] The invention relates to a preparation method of nano silicon dioxide, which belongs to the preparation technology of inorganic nano materials, and specifically relates to a method for preparing nano silicon dioxide by using alkali metal silicate as a silicon source. Background technique [0002] Nano silica is an amorphous white powder, which is a non-toxic, odorless and non-polluting non-metallic functional material, which can be widely used as catalyst carrier, separating agent, adsorbent and chemical and biological sensing materials. For these applications, the key factors affecting the performance of nano-silica are the specific surface area, pore volume and pore size distribution of the sample. Therefore, how to control its specific surface area and pore structure during the preparation of nano-silica has become an important issue. [0003] Regarding the preparation technology of silicon dioxide, Chinese patent 02149782.6 discloses "a method for...

Claims

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Application Information

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IPC IPC(8): C01B33/12B82Y40/00
Inventor 达建文邢伟刘爱华冯伟刘剑利陶卫东许金山刘增让
Owner CHINA PETROLEUM & CHEM CORP
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