Amphiphilic silicon dioxide aerogel composite material for wastewater treatment

A technology of silica and composite materials, applied in aerogel preparation, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of secondary pollution of adsorbed oil, low treatment efficiency, slow oil absorption, etc. Accelerated removal, good pore connectivity, and the effect of increasing coordination sites

Active Publication Date: 2019-04-09
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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  • Amphiphilic silicon dioxide aerogel composite material for wastewater treatment
  • Amphiphilic silicon dioxide aerogel composite material for wastewater treatment
  • Amphiphilic silicon dioxide aerogel composite material for wastewater treatment

Examples

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Embodiment 1

[0030]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:

[0031] The first step: citric acid grafted chitosan

[0032] The reaction formula is as follows:

[0033]

[0034] 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

[0045] 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:

[0046] The first step: citric acid grafted chitosan

[0047] 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

[0059] 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:

[0060] The first step: citric acid grafted chitosan

[0061] The reaction formula is as follows:

[0062]

[0063] 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 silicon dioxide aerogel composite material for wastewater treatment. The material is prepared by combining citric acid grafted chitosan and silicate solution under catalysis of silane coupler, and has the tap density of 0.15-0.30g/cm<3>, the specific surface area of more than 600m<2>/g and methylbenzene oil absorption performance of more than 3g/g. The composite material belongs to high-end silicon-based nano-porous materials, citric acid grafted chitosan with a hydrophilic group is combined with silicon oxide aerogel to prepare the composite aerogel withhydrophilic and oleophilic double characteristics, which has the adsorption rate on water and oily material methylbenzene being respectively 520 percent and 485 percent, has the characteristics of large specific surface area, high porosity, good pore diameter connectivity and the like, and is suitable for adsorbing and deeply treating oily substances, especially emulsified oily pollutants in water.

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 Applications(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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