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Nano silica sol synthesis and application method

A technology of nano-silica sol, application method, applied in the direction of application, nanotechnology, silicon compound, etc.

Inactive Publication Date: 2019-06-18
HUAINAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a synthesis and application method of nano-silica sol to solve the technical problem of growing food safety standard rice in cadmium-contaminated paddy fields proposed in the above-mentioned background technology

Method used

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  • Nano silica sol synthesis and application method
  • Nano silica sol synthesis and application method
  • Nano silica sol synthesis and application method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] Ordinary SiO 2 Preparation and characterization methods of NPs sol:

[0018] ①Mix 100mL absolute ethanol, 6mL concentrated ammonia water and 3mL deionized water, and stir magnetically for 3h (30°C, 300r / min);

[0019] ②Add 2.0mL tetraethyl orthosilicate (TEOS) dropwise, and continue magnetic stirring for 3h (25°C, 300r / min);

[0020] ③ Dilute to 200mL with deionized water, stir magnetically for 1h (75°C, 300r / min), store at 4-8°C for later use;

[0021] ④ Application of TEM and EDS on SiO 2 NPs for characterization (eg figure 1 shown)

[0022] It should be noted that, in figure 1 and figure 2 In Figure B, the abscissa unit is keV, and the ordinate is the characteristic X-ray count rate; image 3 S1-SiO in 2 NPs represent ordinary SiO 2 NPs sol (the same below), S2-SiO 2 NPs represent SiO in the synthesis and application method of silica sol of the present invention 2 NPs sol (the same below). Foliar spraying of S2-SiO 2 The effect of NPs sol dilution on in...

Embodiment

[0026] Pot experiment: the pH value of the experimental soil was 7.5, the background value of Cd was 0.25mg / kg, and the cation exchange capacity was 18.09±1.82cmol / kg. The experimental design is as follows:

[0027] (1) Ordinary SiO 2 NPs experimental group: 3.0mg / kg exogenous Cd polluted soil + spraying deionized water, 3.0mg / kg exogenous Cd polluted soil + spraying S1-SiO 2 NPs (diluted 30×), 3.0mg / kg exogenous Cd contaminated soil + spraying S1-SiO 2 NPs(20×), 3.0mg / kg exogenous Cd polluted soil + spraying S1-SiO 2 NPs (10×).

[0028] (2) This application method prepares SiO 2 NPs experimental group: 3.0mg / kg exogenous Cd polluted soil + spraying S2-SiO 2 NPs(30×), 3.0mg / kg exogenous Cd polluted soil + spraying S2-SiO 2 NPs(20×), 3.0mg / kg exogenous Cd polluted soil + spraying S2-SiO 2 NPs (10×).

[0029] In each of the above-mentioned treatment groups, 3 pots / treatment group, 12 identical seedlings / pot, 30kg sifted dry soil / pot, spray the above-mentioned dilution so...

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Abstract

The invention discloses a nano silica sol synthesis and application method. By application of the method, silica sol (S2-SiO2NPs) in particle size of 2-5nm can be prepared; two weeks before rice booting, cadmium can be remarkably inhibited from migration and accumulation in rice grains by foliage spraying of sol diluted liquid, and the inhibitory effect is evidently superior to that of spraying ofnormal nano silica sol (S1-SiO2NPs) in same dilution ratio. The method is simple in synthesis step, low in cost and easy to popularize, and an efficient and convenient technique can be provided for cadmium non-point source pollution prevention and control and reduction of rice cadmium content of paddy fields.

Description

technical field [0001] The invention relates to a synthesis and application method of nano-silica sol, which suppresses the migration and accumulation of cadmium to rice through the rice leaf surface pathway. Two weeks before rice booting, foliar spraying of this sol dilution can effectively reduce the accumulation of cadmium in rice, and its inhibitory effect is significantly better than that of spraying ordinary silica sol dilution. The synthesis method is simple, low in cost, easy to popularize, and can provide an efficient and convenient technology for the prevention and control of cadmium pollution in rice fields and the reduction of cadmium content in rice. Background technique [0002] Foliar resistance control technology is to spray an appropriate dose of improver on the foliage of plants to inhibit the migration and accumulation of toxic heavy metals or metalloids to fruits or seeds. It is also an important way to reduce the content of cadmium, arsenic, lead and oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/145B82Y30/00A01G22/22A01G7/06
Inventor 汪承润戎红涂俊芳韩娟刘天骄
Owner HUAINAN NORMAL UNIV
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