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Method for preparing nano MgO sustained-release sterilizing granules

A nano-particle technology, applied in botany equipment and methods, disinfectant, microsphere preparation, etc., can solve the problem of high pH value of nano-MgOp, and achieve the effect of easy control of conditions, simple operation process and low price

Inactive Publication Date: 2013-07-17
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the above existing problems, to provide a preparation method of nano-MgO slow-release disinfection particles, to solve the problem of too high pH value when nano-MgO is applied to water treatment

Method used

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  • Method for preparing nano MgO sustained-release sterilizing granules
  • Method for preparing nano MgO sustained-release sterilizing granules
  • Method for preparing nano MgO sustained-release sterilizing granules

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of nanometer MgO sustained-release disinfection particles, the steps are as follows:

[0030] 1) Dissolve 0.5 g of fat-soluble chitosan in 100 mL of acetic acid aqueous solution with a concentration of 1% by volume at 100 °C, add 4.8 g of CaCl after cooling to room temperature 2 2H 2 O, after fully dissolving, adjust the pH value to 5.0-5.5 with a concentration of 1mol / L NaOH aqueous solution to obtain a chitosan solution;

[0031] 2) Prepare a sodium alginate aqueous solution with a concentration of 12mg / mL, add 0.1 g of nano-MgO powder, the average particle size of the nano-MgO powder is 10-80nm, and the specific surface area is 30-50m 2 / g, make nano MgO turbid liquid;

[0032] 3) Drop the nano-MgO turbid solution into the chitosan solution at a rate of 2-3 drops / second. After the addition is completed, stir the above reaction solution at a speed of 1000-1200 rpm for half an hour, discard the liquid to obtain milky white microspheres;

[0033]...

Embodiment 2

[0038] A preparation method of nanometer MgO sustained-release disinfection particles, the steps are as follows:

[0039] 1) Dissolve 0.7g of fat-soluble chitosan in 100mL of acetic acid aqueous solution with a concentration of 2% by volume at 100°C, add 3.6g of CaCl after cooling to room temperature 2 2H 2 O, after fully dissolving, adjust the pH value to 5.0-5.5 with a concentration of 1mol / L NaOH aqueous solution to obtain a chitosan solution;

[0040] 2) Prepare a sodium alginate aqueous solution with a concentration of 12mg / mL, add 0.3g of nano-MgO powder, the average particle size of the nano-MgO powder is 10-80nm, and the specific surface area is 30-50m 2 / g, make nano MgO turbid liquid;

[0041] 3) Drop the nano-MgO turbid solution into the chitosan solution at a rate of 2-3 drops / second. After the addition is completed, stir the above reaction solution at a speed of 1000-1200 rpm for half an hour, discard the liquid to obtain milky white microspheres;

[0042] 4) W...

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Abstract

The invention discloses a method for preparing nano MgO sustained-release sterilizing granules. The method comprises the following steps of: 1) dissolving Fat-soluble chitosan in an aqueous solution of acetic acid to obtain a chitosan solution; 2) preparing an aqueous solution of sodium alga acid, and adding nano MgO powder to obtain a nano MgO turbid solution; 3) dripping the nano MgO turbid solution into the chitosan solution, stirring the reaction liquid for half an hour, and removing the liquid to obtain milky microspheres; 4) washing the obtained milky microspheres with distilled water; and 5) drying the microspheres to obtain the yellow nano MgO sustained-release sterilizing granules. The method has the advantages that: 1) raw materials such as sodium alga acid, chitosan and the like are wide in sources, low in prices, safe and nontoxic; 2) a gel is introduced, so that the nano MgO can be immobilized on a carrier and cannot be washed away by current; 3) through a sustained-release system, the pH of the system can be stabilized in an acceptable range; and 4) an operating process of reaction is simple, reaction conditions are easy to control, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method of nanometer MgO sustained-release disinfection particles. Background technique [0002] Nano-MgO is a new fine-function inorganic material produced with the development of nano-material technology, which has obvious small size effect, surface effect, quantum size effect and macroscopic tunnel effect. Studies have shown that due to the huge specific surface area of ​​nano-MgO, a large number of crystal defects and the positive charge on the particle surface, nano-MgO has a high killing activity against bacteria, spores, viruses and other microorganisms. with nano TiO 2 Compared with other solid nano-scale fungicides such as , nano-silver, and nano-copper, nano-MgO has low toxicity and low cost, making it possible to become an excellent drinking water disinfectant. However, when nano-MgO is placed in water, it will react with wat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N59/06A01N25/12A01N25/04A01P1/00B01J13/02
Inventor 安毅张克强董琪
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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