Synthesis method and applications of inner-outer dual-layer amino modified SiO2 aerogel

A technology of inner and outer double layers and synthesis method, which is applied in the direction of chemical instruments and methods, silicon compounds, alkali metal compounds, etc., can solve the problem of low removal rate of humic acid, and achieve a simple and practical synthesis process, fast and high adsorption capacity, high The effect of the amount of adsorption

Active Publication Date: 2019-09-20
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of inner and outer double-layer amine group modified SiO 2 The synthesis method and application of airgel to ensure the inner and outer double-layer amine-modified SiO 2 Airgel can have high selectivity for the adsorption of humic acid pollutants, while maintaining the excellent structural characteristics of silica airgel with high specific surface area, and solve the problem of low removal rate of humic acid

Method used

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  • Synthesis method and applications of inner-outer dual-layer amino modified SiO2 aerogel
  • Synthesis method and applications of inner-outer dual-layer amino modified SiO2 aerogel
  • Synthesis method and applications of inner-outer dual-layer amino modified SiO2 aerogel

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Embodiment 1

[0029] This embodiment is the inner and outer double-layer amino-modified SiO described in the present invention. 2 An example of the synthetic method of airgel is synthesized by the sol-gel method, which consists of the following steps:

[0030] (1) Accurately weigh 30 g of rice husk ash and 8 g of sodium hydroxide with an analytical balance and place them in a round-bottomed flask, heat to 100° C., reflux and stir for 3.5 hours;

[0031] (2) carry out vacuum filtration after the product after reaction is cooled to room temperature, can obtain the water glass that modulus is 4.26;

[0032] (3) getting 20ml of the modulus prepared by rice husk ash is 4.26 water glass, carry out ion exchange by strongly acidic cation exchange resin 001*7 (732 type), remove the sodium ion in the water glass, obtain silicic acid solution;

[0033] (4) Adjust the pH of the obtained silicic acid solution to 4.5 with 1 mol / L ammonia solution and 1 mol / L hydrochloric acid solution. Then quickly ult...

Embodiment 2

[0037] This example is the inner and outer double-layer amino-modified SiO prepared by the present invention. 2 Application example of airgel in wastewater purification, SiO modified with double-layer amine groups 2 Airgel is used as an adsorbent to purify a high-concentration humic acid solution. The test conditions are: the initial concentration of the humic acid solution is 1211 mg / L, and the adsorption time is 90 minutes. Other conditions are the same as in Example 1, and a 0.45 μm filter membrane is used for filtration. , to detect and calculate the double-layer amine-modified SiO 2 The adsorption capacity of airgel to humic acid is 1205.4mg / g, and the removal rate is 99.02%.

[0038] It can be seen that the inner and outer double-layer amino-modified SiO prepared by the present invention 2 Airgel has a fast and high adsorption capacity treatment effect for high-concentration humic acid solutions.

Embodiment 3

[0040] This example is the inner and outer double-layer amino-modified SiO prepared by the present invention. 2 Another example of the application of airgel in wastewater purification, SiO modified with double-layer amine groups 2 Airgel is used as an adsorbent, the pH of the solution is 3, other conditions are the same as in Example 1, and a 0.45 μm membrane filter is used to detect and calculate the double-layer amine-modified SiO 2 The adsorption capacity of airgel to humic acid is 48.75mg / g, and the removal rate is 85.28%.

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Abstract

The invention discloses a synthesis method and applications of inner-outer dual-layer amino modified SiO2 aerogel. The synthesis method comprises following steps: preparing 20 mL of sodium silicate, removing sodium ions in sodium silicate by a cation exchange resin column; adjusting the pH value of obtained silicic acid solution to 4.0-8.0 by an ammonia solution (0.1-2.0 mol / L) and a hydrochloric acid solution (0.1-2.0 mol / L); rapidly subjecting a beaker containing the silicic acid solution to an ultrasonic treatment, sequentially adding epoxy chloropropane, APETS, ethylene diamine and n-hexane according to a volume ratio of 1:1:1:16, wherein epoxy chloropropane, APETS, and ethylene diamine form a mixed modifier; slowly shaking the beaker under an ultrasonic condition until the solution is converted into gel, then storing the gel for 5 to 24 hours at a temperature of 30 to 65 DEG C, then adding 28 mL of n-hexane into the gel, continuously vibrating the gel for 5 to 24 hours at a temperature of 30 to 65 DEG C; and finally, freeze-drying the wet gel in vacuum for 10 to 48 hours to obtain the inner-outer dual-layer amino modified SiO2 aerogel. The initial adsorbent concentration of the aerogel is 1211 mg / L (humic acid solution), the adsorption balance is reached within 90 minutes, and the adsorption amount is as much as 1194.4 mg / g.

Description

technical field [0001] The invention relates to the technical field of adsorbent preparation, in particular to an inner and outer double-layer amine group modified SiO 2 Synthesis method of airgel and its application. Background technique [0002] The rapid development of the global economy has led to serious environmental pollution problems, and environmental pollution has also become a severe challenge in the process of social sustainable development. In recent years, water pollution dominated by refractory organic matter has become increasingly serious, and the development of low-cost, green treatment methods will be critical. Among the refractory organic pollutants, high-concentration organic substances such as humic acid, as secondary pollutants produced in the waste treatment process, have always been a difficulty in the water treatment industry. When the high concentration of humic acid organic pollutants pollute the water body, it will lead to higher chroma and tur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158C01B33/154B01J20/10B01J20/28B01J20/30C02F1/28C02F101/38
CPCC01B33/1585C01B33/1543B01J20/103B01J20/28047C02F1/281C01P2004/03C02F2101/38
Inventor 冯庆革陈考
Owner GUANGXI UNIV
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