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An amphiphilic silica airgel composite material for wastewater treatment

A technology of silica and composite materials, applied in airgel preparation, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of secondary pollution of adsorbed oil, slow oil absorption speed, and low treatment efficiency, and achieve Accelerated removal, increased coordination points, good pore connectivity

Active Publication Date: 2021-10-26
JIANGSU MIRAFUL NANO MATERIAL CO LTD +1
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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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  • An amphiphilic silica airgel composite material for wastewater treatment
  • An amphiphilic silica airgel composite material for wastewater treatment
  • An amphiphilic silica airgel composite material for wastewater treatment

Examples

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Embodiment 1

[0031]An amphiphilic silica airgel composite material for wastewater treatment, which is obtained by compounding chitosan grafted with citric acid and silicic acid solution under the catalysis of a silane coupling agent, specifically amphiphilic silica The preparation method of airgel composite material is:

[0032] The first step: citric acid grafted chitosan

[0033] The reaction formula is as follows:

[0034]

[0035] 1g chitosan is dissolved in 100ml 2% formic acid solution, makes chitosan solution; Citric acid is dissolved in DMF solution and is configured into 20% citric acid solution, citric acid solution is mixed with chitosan solution, Add HOBT / EDCI and triethylamine, the amount of HOBT / EDCI added is 0.3 times the molar amount of citric acid, and the added amount of triethylamine is 0.5 times the molar amount of citric acid; stir at 35°C for 2h, adjust the pH of the solution to 7.50, precipitated, filtered, washed with purified water, obtained the citric acid gr...

Embodiment 2

[0046] An amphiphilic silica airgel composite material for wastewater treatment, which is obtained by compounding chitosan grafted with citric acid and silicic acid solution under the catalysis of a silane coupling agent, specifically amphiphilic silica The preparation method of airgel composite material is:

[0047] The first step: citric acid grafted chitosan

[0048] 1g chitosan is dissolved in 100ml 2% formic acid solution, makes chitosan solution; Dissolving citric acid in DMF solution is configured into 35% citric acid solution, citric acid solution is mixed with chitosan solution, Add HOBT / EDCI and triethylamine, the amount of HOBT / EDCI added is 0.3 times the molar weight of citric acid, and the added amount of triethylamine is 0.5 times the molar weight of citric acid; stir at 40°C for 2h, adjust the pH of the solution to 8.0, precipitated, filtered, washed with purified water, obtained the citric acid grafted chitosan of formula a structure, the reaction formula is a...

Embodiment 3

[0060] An amphiphilic silica airgel composite material for wastewater treatment, which is obtained by compounding chitosan grafted with citric acid and silicic acid solution under the catalysis of a silane coupling agent, specifically amphiphilic silica The preparation method of airgel composite material is:

[0061] The first step: citric acid grafted chitosan

[0062] The reaction formula is as follows:

[0063]

[0064] 1g chitosan is dissolved in 100ml 2% formic acid solution, makes chitosan solution; Citric acid is dissolved in DMF solution and is configured into 30% citric acid solution, citric acid solution is mixed with chitosan solution, Add HOBT / EDCI and triethylamine, the amount of HOBT / EDCI added is 0.3 times the molar amount of citric acid, and the added amount of triethylamine is 0.5 times the molar amount of citric acid; stir at 38°C for 2h, adjust the pH of the solution to 7.6. Precipitate, filter, and wash with purified water to obtain citric acid-grafted...

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Abstract

The invention discloses an amphiphilic silica airgel composite material for wastewater treatment, which is obtained by compounding chitosan grafted with citric acid and a silicic acid solution under the catalysis of a silane coupling agent. The tap density of silica airgel composites is 0.15‑0.30 g / cm 3 , specific surface area: >600 m 2 / g, toluene oil absorption performance: >3g / g; the composite material is a high-end silicon-based nanoporous material, which combines citric acid-grafted chitosan with hydrophilic groups and silica airgel to prepare a hydrophilic Composite airgel with dual characteristics of water and lipophilicity, its adsorption rate for water and oily material toluene is as high as 520% ​​and 485% respectively, and it also has the characteristics of large specific surface area, high porosity, and good pore connectivity, which is very suitable for Adsorption and advanced treatment of oily substances in water, especially emulsified oil pollutants.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an amphiphilic silica airgel composite material used for wastewater treatment. 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 v...

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
CPCB01J13/0091B01J20/103B01J20/26B01J20/28011B01J20/28047C02F1/281C02F1/285
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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