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A kind of production technology of amphiphilic silica-chitosan composite airgel

A composite airgel and composite gel technology, applied in the field of amphiphilic silica-chitosan composite airgel production technology, can solve the problems of secondary pollution of adsorbed oil, low processing efficiency, slow oil absorption speed, etc. Achieve accelerated removal, good pore connectivity and high porosity

Active Publication Date: 2021-08-03
JIANGSU MIRAFUL NANO MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently commonly used adsorption materials such as activated carbon, super oil-absorbing resin, fly ash, bentonite, etc. have problems such as high price, low oil absorption, slow oil absorption speed, difficult regeneration, secondary pollution of adsorbed oil, low treatment efficiency, and poor cost performance. Urgent need to develop new and efficient adsorption materials

Method used

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  • A kind of production technology of amphiphilic silica-chitosan composite airgel
  • A kind of production technology of amphiphilic silica-chitosan composite airgel
  • A kind of production technology of amphiphilic silica-chitosan composite airgel

Examples

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Embodiment 1

[0030] A kind of production technology of amphiphilic silicon oxide-chitosan composite airgel, specifically comprises the following steps:

[0031] (1) Modification of chitosan

[0032] The reaction formula is as follows:

[0033]

[0034] Dissolve 1g of chitosan in 100ml of 2% acetic acid solution to obtain a chitosan solution; dissolve naphthalene-1,4,5,8-tetracarboxylic dianhydride in DMF solution to form a 40-50% Naphthalene acid solution, mix naphthalene acid solution with chitosan solution, add HOBT / EDCI and triethylamine, the addition of HOBT / EDCI is 1.1 times of the molar weight of naphthalene acid, the addition of triethylamine is the molar weight of naphthalene acid 1.5 times of that; stirred at 35°C for 2 hours, adjusted the pH of the solution to 7.5, precipitated, filtered, and washed with purified water to obtain naphthoic acid-grafted chitosan with a structure of formula a, and dissolved the washed precipitate in 100ml of 2% In the acetic acid solution, conf...

Embodiment 2

[0046] A kind of production technology of amphiphilic silicon oxide-chitosan composite airgel, specifically comprises the following steps:

[0047] (1) Modification of chitosan

[0048] Dissolve 1g of chitosan in 100ml of 2% acetic acid solution to obtain a chitosan solution; dissolve naphthalene-1,4,5,8-tetracarboxylic dianhydride in DMF solution to form 50% naphthalene acid Solution, mix naphthalene acid solution with chitosan solution, add HOBT / EDCI and triethylamine, the addition of HOBT / EDCI is 1.1 times of the molar weight of naphthalene acid, the addition of triethylamine is 1.5 times of the molar weight of naphthalene acid Stir at 40°C for 2 hours, adjust the pH of the solution to 8.0, precipitate out, filter, and wash with purified water to obtain naphthoic acid-grafted chitosan with a structure of formula a, dissolve the washed precipitate in 100ml of 2% acetic acid In the solution, it is configured into a chitosan solution;

[0049] The reaction formula is as foll...

Embodiment 3

[0061] A kind of production technology of amphiphilic silicon oxide-chitosan composite airgel, specifically comprises the following steps:

[0062] (1) Modification of chitosan

[0063] The reaction formula is as follows:

[0064]

[0065] Dissolve 1g of chitosan in 100ml of 2% acetic acid solution to prepare a chitosan solution; dissolve naphthalene-1,4,5,8-tetracarboxylic dianhydride in DMF solution to form 45% naphthalene acid Solution, mix naphthalene acid solution with chitosan solution, add HOBT / EDCI and triethylamine, the addition of HOBT / EDCI is 1.1 times of the molar weight of naphthalene acid, the addition of triethylamine is 1.5 times of the molar weight of naphthalene acid Stir at 38°C for 2 hours, adjust the pH of the solution to 7.7, precipitate out, filter, and wash with purified water to obtain naphthoic acid-grafted chitosan with a structure of formula a, dissolve the washed precipitate in 100ml of 2% acetic acid In the solution, it is configured into a c...

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Abstract

The invention discloses a production process of an amphiphilic silica-chitosan composite airgel. Firstly, chitosan is modified to prepare chitosan grafted with naphthoic acid, and then the chitosan is grafted with naphthoic acid. The solution was mixed and coupled with the silicic acid solution, and after dehydration and drying, the amphiphilic silica-chitosan composite airgel was prepared; this product has unique hydrophilic and lipophilic characteristics, and has good compatibility with the water system environment. At the same time, it also has the characteristics of large specific surface area, high porosity, and good pore connectivity, which is very suitable for the adsorption and advanced treatment of oily substances in water, especially emulsified oil pollutants. In addition, the prepared amphiphilic silica-chitosan While the composite airgel is adsorbing heavy metal ions, it can also use the fluorescence effect to detect the content of heavy metal ions, which realizes the monitoring of heavy metal ions in wastewater, and can accurately calculate the amount of composite airgel required. Reduce labor and resource waste.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a production process of an amphiphilic silicon oxide-chitosan composite airgel. Background technique [0002] Airgel is a kind of light nanoporous material obtained by sol-gel process, which has a three-dimensional network structure, and the skeleton and pores are nanoscale, and the pores are filled with gas. Silica aerogel is a typical example. Representative, with a low density (0.00016-0.3 g / cm 3 ), large specific surface area (200-2000 m 2 / g), low thermal conductivity (0.013 W / m.K at room temperature), etc., it has broad application prospects in many fields such as heat insulation, adsorption, drug loading, catalysis, and solar cells. What is particularly noticeable is that airgel materials have much higher properties than traditional nano-powder materials (such as Degussa P25 TiO 2 Nano powder: BET-55m 2 / g) specific surface area, high pore ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00B01J20/30B01J20/26B01J20/28C02F1/28
Inventor 王美兰徐海波周喆王慧颖左明鸣
Owner JIANGSU MIRAFUL NANO MATERIAL CO LTD
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