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Preparation method of sodium alginate/cattail/graphene oxide composite aerogel

A graphene composite and composite airgel technology, which is applied in chemical instruments and methods, alkali metal compounds, water/sludge/sewage treatment, etc., can solve the problems of low mechanical strength and poor mechanical properties of biomass airgel , to achieve the effect of excellent mechanical properties, superior mechanical properties and low cost

Active Publication Date: 2018-10-16
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to apply this biomass aerogel on a large scale, it still needs to overcome the problem of its low mechanical strength.
Many scholars have successfully prepared biomass aerogels capable of oil-water separation, but they have not considered the problem of poor mechanical properties of biomass aerogels. In order to improve the problem of low mechanical strength of biomass aerogels, an effective method There are methods of adding reinforcement phase, chemical cross-linking, changing freeze casting, etc.
Although these methods improve the mechanical properties of biomass aerogels, how to effectively combine these methods to make biomass aerogels with superelasticity is still a problem to be solved.

Method used

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  • Preparation method of sodium alginate/cattail/graphene oxide composite aerogel
  • Preparation method of sodium alginate/cattail/graphene oxide composite aerogel
  • Preparation method of sodium alginate/cattail/graphene oxide composite aerogel

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Embodiment 1

[0046] (1) Prepare sodium alginate / typha / graphene oxide uniform mixed solution:

[0047] A. Preparation of graphene oxide dispersion: adding graphene oxide powder into deionized water, ultrasonic treatment for 2h, so that graphene oxide powder is evenly dispersed in deionized water, and a uniform graphene oxide dispersion is obtained;

[0048] B. Preparation of cattail fiber: First, wash 50 grams of cattail flower spikes in sequence with 1L of water and 1L of ethanol, add 4g of sodium chlorite and 400mL of deionized water into a flask equipped with a mechanical stirrer and a thermometer, and stir to fully dissolve them , adjust the pH of the sodium chlorite solution to 4.5 with 1.2 ml of acetic acid. Then add 4g of cattail flower spikes, stir at 1000rpm and 80°C for 2 hours, wash with deionized water to pH=6, then wash three times with absolute ethanol to remove residual water, and dry it in an oven at 60°C. Finally, dry cattail fibers are obtained.

[0049] C. Preparation o...

Embodiment 2

[0053] (1) Prepare sodium alginate / typha / graphene oxide uniform mixed solution:

[0054] A. Preparation of graphene oxide dispersion: adding graphene oxide powder into deionized water, ultrasonic treatment for 2h, so that graphene oxide powder is evenly dispersed in deionized water, and a uniform graphene oxide dispersion is obtained;

[0055] B. Preparation of cattail fiber: First, wash 50 grams of cattail flower spikes in sequence with 1L of water and 1L of ethanol, add 4g of sodium chlorite and 400mL of deionized water into a flask equipped with a mechanical stirrer and a thermometer, and stir to fully dissolve them , adjust the pH of the sodium chlorite solution to 4.5 with 1.2 ml of acetic acid. Then add 4g of cattail flower spikes, stir at 1000rpm and 80°C for 2 hours, wash with deionized water to pH=6, then wash three times with absolute ethanol to remove residual water, and dry it in an oven at 60°C. Finally, dry cattail fibers are obtained.

[0056] C. Preparation o...

Embodiment 3

[0060] (1) Prepare sodium alginate / typha / graphene oxide uniform mixed solution:

[0061] A. Preparation of graphene oxide dispersion: adding graphene oxide powder into deionized water, ultrasonic treatment for 3h, so that graphene oxide powder is evenly dispersed in deionized water, and a uniform graphene oxide dispersion is obtained;

[0062] B. Preparation of cattail fiber: First, wash 50 grams of cattail flower spikes in sequence with 1L of water and 1L of ethanol, add 4g of sodium chlorite and 400mL of deionized water into a flask equipped with a mechanical stirrer and a thermometer, and stir to fully dissolve them , adjust the pH of the sodium chlorite solution to 4.5 with 1.2 ml of acetic acid. Then add 4g of cattail flower spikes, stir at 1000rpm and 80°C for 2 hours, wash with deionized water to pH=6, then wash three times with absolute ethanol to remove residual water, and dry it in an oven at 60°C. Finally, dry cattail fibers are obtained.

[0063] C. Preparation o...

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Abstract

The invention relates to a preparation method of a sodium alginate / cattail / graphene oxide composite aerogel, and belongs to the technical field of preparation of biomass-based functional materials. The preparation method comprises the following specific steps: mixing sodium alginate powder and cattail fiber, adding the mixture into graphene oxide dispersion, and carrying out stirring to obtain a uniform mixed solution; carrying out freeze-drying by a two-way freeze casting method to obtain an un-crosslinked composite aerogel, immersing the composite aerogel in an ethanol / water mixed solution containing CaCl2, and then carrying out freeze-drying for a second time to obtain a calcium ion crosslinked sodium alginate / cattail / graphene oxide composite aerogel. According to the preparation methodprovided by the invention, a simple, efficient, economical and environment-friendly synthesis method is adopted to obtain a three-dimensional parallel laminated structure, parallel sheets are connected with one another by honeycomb holes, and the three-dimensional parallel laminated structure has an excellent underwater super-oleophobic property; and after the composite aerogel and a filter instrument are assembled, insoluble oil and water-soluble dyes can be synchronously removed, and the composite aerogel has a good application value and a wide market prospect.

Description

technical field [0001] The invention relates to a preparation method of a sodium alginate / typha / graphene oxide composite airgel, which belongs to the technical field of preparation of biomass-based functional materials. Background technique [0002] Due to the increasing discharge of water-soluble organic pollutants such as oily sewage and dyes year by year, a variety of organic pollutants coexist in wastewater. How to simultaneously remove these organic pollutants in water has become the focus of attention worldwide. The rapid and efficient separation of oil-water mixture and the removal of water-soluble organic pollutants are of great practical significance not only for the governance and protection of the ecological environment, but also for the recycling of renewable resources. However, the traditional removal methods of organic pollutants, such as by burning, mechanical treatment, adding dispersant, biological treatment and so on. Some have low removal efficiency, some...

Claims

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Application Information

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IPC IPC(8): B01J20/28C02F1/28B01J20/30C02F101/30
CPCB01J20/20B01J20/24B01J20/28047C02F1/28C02F2101/30C02F2101/308
Inventor 杨进夏云飞徐鹏
Owner JIANGSU UNIV
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