Preparation method and application of composite structure superhydrophilic chitosan aerogel under oil

A composite structure and chitosan technology, applied in separation methods, chemical instruments and methods, alkali metal compounds, etc., can solve problems such as high pollution and high cost, and achieve simple operation, controllable experimental parameters, and convenient secondary recovery Effect

Active Publication Date: 2018-08-10
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of super-hydrophilic chitosan airgel under composite structure oil and its application, which solves the high pollution, high cost and large-scale equipment required in the preparation method of existing oil-water separation products etc. restrictions

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  • Preparation method and application of composite structure superhydrophilic chitosan aerogel under oil
  • Preparation method and application of composite structure superhydrophilic chitosan aerogel under oil
  • Preparation method and application of composite structure superhydrophilic chitosan aerogel under oil

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specific Embodiment approach 1

[0030] Specific implementation mode one: as figure 1 As shown, the present embodiment prepares superhydrophilic chitosan airgel under oil according to the following steps:

[0031] Step 1: Preparation of chitosan three-dimensional network airgel by ice template method

[0032] 1. Prepare chitosan solution (0.1~10wt %): Dissolve chitosan powder (0.1~10g, Mw=100~1000) in 100ml of acetic acid aqueous solution (0.5~5 wt %).

[0033] 2. Inject the chitosan solution into a plastic mold, seal it with plastic wrap, freeze it completely at -20~-40°C for 10~30h, take it out, put it in a freeze dryer, freeze dry it for 3~7 days, and get a block Chitosan airgel ( Figure 2-3 ).

[0034] The three-dimensional network chitosan airgel is formed by freezing water into ice crystals as templates and drying to remove them. The freeze-drying time and the concentration of acetic acid will play a decisive role in the hydrophilicity of chitosan and subsequent formation of hydrogel layer by chito...

specific Embodiment approach 2

[0039] Specific embodiment two: this embodiment prepares superhydrophilic chitosan airgel under oil according to the following steps:

[0040] Step 1: Preparation of chitosan three-dimensional network airgel by ice template method

[0041] Prepare chitosan solution (1 wt %): Dissolve chitosan powder (1 g, Mw=200~400) in 100 ml of acetic acid aqueous solution (1 wt %). The chitosan solution was injected into a plastic mold, sealed with a plastic wrap, completely frozen at -25°C for 15 hours, taken out, put into a freeze dryer, and freeze-dried for 6 days.

[0042] Step 2, pre-soaking the prepared chitosan airgel.

[0043] The prepared chitosan airgel was completely immersed in water, the soaking time was controlled to be 2s, and the thickness of the outer hydrogel layer was tested to be 1.5mm.

[0044] Step 3: Apply the composite structure chitosan in step 2 to absorb water in the oil-water mixture, the adsorption capacity is 88.21g / g, and the test separation efficiency can r...

specific Embodiment approach 3

[0046] Specific embodiment three: this embodiment prepares superhydrophilic chitosan airgel under oil according to the following steps:

[0047] Step 1: Preparation of chitosan three-dimensional network airgel by ice template method

[0048] Prepare chitosan solution (2 wt %): Dissolve chitosan powder (2 g, Mw=200~400) in 100 ml of acetic acid aqueous solution (2 wt %). The chitosan solution was injected into a plastic mold, sealed with a plastic wrap, completely frozen at -25°C for 15 hours, taken out, put into a freeze dryer, and freeze-dried for 6 days.

[0049] Step 2, pre-soaking the prepared chitosan airgel.

[0050] The prepared chitosan airgel was completely immersed in water, the soaking time was controlled to be 1s, and the thickness of the outer hydrogel layer was tested to be 1mm.

[0051] Step 3: Apply the composite structure chitosan in step 2 to absorb water in the oil-water mixture, the adsorption capacity is 105.32g / g, and the test separation efficiency can re...

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Abstract

The invention discloses a preparation method of a composite-structure under-oil super-hydrophilic chitosan aerogel and application thereof. The preparation method comprises the following steps: 1, utilizing an ice template method to prepare three-dimensional network-like chitosan aerogel; 2, completely immersing the three-dimensional network-like chitosan aerogel prepared in step 1 into water, and controlling the immersion time in a range of 0.5-5s and the thickness of an exterior hydrogel layer in a range of 0.5-4mm, thereby obtaining a composite-structure chitosan with the chitosan hydrogel as the outer layer and the chitosan aerogel as the inner layer; 3, applying the chitosan aerogel to under-oil water absorption: applying the composite-structure chitosan prepared in step 2 to under-oil water absorption. The invention solves limits of high pollution, high cost, a requirement of large instruments and the like in the existing oil-water separation product preparation method. According to the preparation method of the composite-structure under-oil super-hydrophilic chitosan aerogel and the application thereof, the ice template method is utilized to prepare the under-oil super-hydrophilic chitosan aerogel, the aperture of each of three-dimensional multiple holes of the chitosan aerogel is 20-30 microns, the adsorption capacity is up to 40-150 g / g, and the test separation efficiency can reach 99.5% or above.

Description

technical field [0001] The invention relates to a preparation method and application of chitosan airgel with super-hydrophilic composite structure under oil. Background technique [0002] With the increase of industrial oily wastewater discharge and the frequent occurrence of offshore oil spills, oil-water separation has become an urgent problem to be solved in environmental protection. However, many organic synthesis reactions need to be carried out under anhydrous conditions, so there is an urgent need for water adsorbents. At present, there are many oil-water separation materials, which are mainly divided into "water removal type" and "oil removal type" materials. There are many types of degreasing materials, which can be divided into many types according to the physical form of the substrate, such as omentum-based materials, woven fabric-based materials, particulate matter, sponge-like materials, and so on. However, oil-removing oil-water separation materials are prone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/40C08J9/28B01J20/24B01J20/28B01D17/022
CPCB01D17/0202B01J20/24B01J20/28047C08J9/28C08J9/40C08J2305/08
Inventor 刘宇艳成中军张恩爽吕通王友善
Owner HARBIN INST OF TECH
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