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Rare earth composite silicasol capable of repressing rice absorbing heavy metal

A technology of rare earth compounding and silica sol, which is applied in the fields of chemicals for biological control, animal repellents, botanical equipment and methods, etc. It can solve the problems of sol stability, large particle size, and complicated operation, etc. problems, to achieve the effect of clean production, mild conditions and high concentration

Active Publication Date: 2009-03-18
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

USP3714064 describes the method for preparing particle size silica sol between 2-5nm with water glass, but in the production process, the ion exchange resin will be cooled, and the volume will be inconvenient when concentrating the silica sol, and the operation is more complicated; USP4806665 and USP4915870 describe the use of short chain Alkanolamine and potassium hydroxide prepare the method for silica sol with particle diameter between 2-5nm, but all do not mention the stability of this type of sol; USP6372806 has described the silica sol with particle diameter less than 4nm prepared with silicic acid and water glass method, but its silicon dioxide content is not more than 20%, and the stable period is only 30 days; CN00814361.7 discloses a method for preparing high-purity The method of silica sol, but the particle size is relatively large; CN96100907.1 describes a method for manufacturing large-particle silica sol with high purity, high concentration, and high uniform particle distribution; CN200410014611.8 proposes a The manufacture method of nano-silica sol for papermaking, but the process is relatively complicated; CN200410077963.8 discloses a production method of acidic silica sol; CN200410091123.7 introduces a preparation method of nano-silver-loaded silica colloid
At present, there is no report on the preparation method of rare earth-doped nano-silica sol specially used to inhibit the absorption of heavy metals in crops

Method used

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  • Rare earth composite silicasol capable of repressing rice absorbing heavy metal
  • Rare earth composite silicasol capable of repressing rice absorbing heavy metal
  • Rare earth composite silicasol capable of repressing rice absorbing heavy metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Preparation of cerium-doped inorganic nano-silica sol with sodium silicate

[0044] Choose SiO 2 / Na 2 O sodium silicate with a molar ratio of 3 was prepared into 400 ml of a sodium silicate solution with a concentration of 10%, and magnetically stirred at a temperature of 30° C. for 2 h.

[0045] Measure 130ml of 10% hydrochloric acid and gradually add it dropwise in the separatory funnel. After the dropwise addition, the pH value of the solution is 9.5; % hydrochloric acid, the active silicic acid solution with a pH value of 2 can be obtained.

[0046] Prepare a potassium hydroxide solution with a concentration of 2% as a catalyst, heat it to 70°C with microwave stirring, add active silicic acid dropwise to it at a constant speed, control the pH value to 8, stop the dropwise addition, continue stirring for 75 minutes, and obtain a A stable transparent slightly alkaline high-purity nano-silica sol.

[0047] Dissolve 50g of cerium nitrate in 500ml of deion...

Embodiment 2

[0049] Example 2 Preparation of cerium-doped inorganic nano-silica sol by changing the method of preparing active silicic acid

[0050] Adopt the method for embodiment 1 to prepare 100ml of 10% sodium silicate solution, pass through 50ml (wet volume) hydrogen type strongly acidic cationic multi-stage resin exchange column at a uniform speed, control column outlet collection liquid pH value at 3, can obtain active silicic acid solution.

[0051] Prepare a potassium hydroxide solution with a concentration of 2% as a catalyst, heat it to 70°C with stirring in a water bath, add active silicic acid to it at a constant speed at a suitable rate, control the pH value to 8, stop the dropwise addition, continue to stir and react for 75 minutes, and complete the treatment A stable, transparent and slightly alkaline high-purity nano-silica sol is obtained.

[0052] Follow the steps of Example 1 to hydrolyze the precipitate, filter and wash, then add water to the filter cake and mix it ev...

Embodiment 3

[0054] Example 3 Preparation of cerium-doped organic nano-silica sol with tetraethyl orthosilicate

[0055] Measure 20ml of ammonia water with a concentration of 25-28%, add 10ml of high-purity water and 500ml of ethanol into a 1000ml self-made reactor, mix and stir evenly, heat to 45°C under water bath conditions, and then add 15ml of orthosilicon Ethyl acetate was added dropwise, and stirred for 3 hours after completion, and 10 milliliters of ethyl orthosilicate was added, and the reaction was continued for 3 hours, and the obtained product was diluted with 1000 milliliters of high-purity water, and the ethanol was removed by vacuum distillation and rotary evaporation, and then used a self-made dialysis device Dialyze until pH = 7 to obtain an organic nano-silica sol.

[0056] Follow the steps in Example 1 to hydrolyze the precipitate, filter and wash, then add water to the filter cake and mix evenly, add nitric acid with a concentration of 10%, adjust the pH to 1.0, stir at...

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Abstract

The invention discloses a nano composite silicasol doped with rare-earth element, which comprises nano silicon dioxde collosol and rare-earth oxide collosol, wherein the content of the rare-earth elements is 0.01-1 wt%. The nano composite silicasol can be synthesized under rather low temperature and normal pressure.

Description

technical field [0001] The invention relates to a nano-silica sol, in particular to a nano-composite silica sol doped with rare earth elements. Background technique [0002] Once discovered, silica sol is widely used in papermaking, coatings, catalysts, anti-skid products, polymer composite materials, electronic packaging materials, precision ceramic materials, rubber, plastics, glass fiber reinforced plastics, adhesives, wafer polishing, high-grade fillers, sealants Among various products in many industries such as paint, optical fiber, precision casting, etc., nano-silica, as an emerging material, has shown its style in the fields of aerospace technology, electronics, metallurgy, chemistry, biology, and medicine. The intersection and integration of inorganic chemistry, environmental chemistry, material science and life science are forming a new research direction. The use of environmental materials and biological nanomaterials to improve crop disease resistance, stress res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N59/00A01P21/00
Inventor 李芳柏刘新铭刘传平刘同旭
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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