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Preparation method of chitosan microspheres and application of chitosan microspheres for removing anionic surfactant

A technology of chitosan microspheres and surfactants, applied in chemical instruments and methods, other chemical processes, alkali metal oxides/hydroxides, etc., can solve the problems of low removal efficiency, cost, etc., and is not easy to cause pollution. , broad application prospects, no toxic and side effects

Pending Publication Date: 2019-04-12
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low removal efficiency and cost in the prior art, provide a chitosan microsphere modified by calcium chloride and quaternary ammonium salt and its preparation method and application, with cross-linked chitosan as the matrix , with calcium chloride and quaternary ammonium salts as ligands for synthetic reactions, the prepared cross-linked chitosan microspheres greatly improve the acid resistance and reactivity of chitosan, good mechanical properties, easy to settle, and can be used as an anionic surface Adsorbent material for active agent

Method used

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  • Preparation method of chitosan microspheres and application of chitosan microspheres for removing anionic surfactant

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specific Embodiment approach 1

[0016] 1. The specific embodiment one; the method of a kind of calcium chloride and quaternary ammonium salt modified chitosan microsphere of present embodiment is to carry out according to the following steps:

[0017] 1. Dissolve chitosan and calcium chloride in acetic acid solution, ultrasonically disperse and dissolve evenly in a volumetric flask, and place for a certain period of time to remove air bubbles (as the water phase);

[0018] 2. Pour liquid paraffin into a three-neck round bottom flask, slowly add span80 emulsifier dropwise under electric stirring, and heat in a water bath (as the oil phase); after the solution is evenly stirred, take calcium chloride chitosan solution, and slowly drop into the oil phase , keep the original rotation speed and emulsify to make a W / O type inverse microemulsion; then add glutaraldehyde dropwise, cool to room temperature after cross-linking and solidification, centrifuge the product, discard the upper oil phase, and wash repeatedly...

specific Embodiment approach 2

[0020] 2. Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, the mass ratio of chitosan and calcium chloride is 1:0.35, and the concentration of the acetic acid solution is 3% (v / v). Others are the same as the first embodiment.

specific Embodiment approach 3

[0021] 3. Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in Step 2, the ratio of span80 to liquid paraffin is 1:20, and the electric stirring speed is 500r / min. Others are the same as those in Embodiment 1 or 2.

[0022] 4. Embodiment 4: The difference between this embodiment and one of Embodiments 1 to 3 is that in step 2, the temperature of the water bath is maintained at 50°C, the ratio of the water phase to the oil phase is 1:10, and the emulsification time is 3h~4h . Others are the same as one of the specific embodiments 1 to 3. Others are the same as one of the specific embodiments 1 to 3.

[0023] 5. Embodiment 5: This embodiment differs from Embodiment 1 to Embodiment 4 in that: in step 2, the ratio of the amount of glutaraldehyde to the water phase is 1:20, and the cross-linking and curing takes 4 hours. Others are the same as one of the specific embodiments 1 to 4.

[0024] 6. Specific embodiment six: what this embodiment is d...

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Abstract

The invention relates to a preparation method of chitosan microspheres modified by calcium chloride and quaternary ammonium salt and an application of the chitosan microspheres for removing an anionicsurfactant, and belongs to the field of adsorbent synthesis. The preparation method comprises the following steps: dissolving chitosan and calcium chloride in an acetic acid solution, and carrying out ultrasonic dispersion to obtain a calcium chloride-chitosan mixed solution which is used as a water phase; adding an emulsifier into liquid paraffin to serve as an oil phase, slowly adding the waterphase into the oil phase, and carrying out stirring for 2-4 hours to form an inverse microemulsion; dropwise adding a certain amount of glutaraldehyde, and continuing carrying out stirring for 3-5 hours for crosslink balling; and then, carrying out a reaction on a certain amount of quaternary ammonium salt and calcium chloride / chitosan microspheres under a proper condition, taking out the obtained substance, quickly placing the substance into a refrigerator for quenching for 7-9 hours, and then repeatedly carrying out washing to obtain the chitosan microspheres modified by calcium chloride and quaternary ammonium salt. The raw material chitosan is rich in reserves and low in cost, is biodegradable, and does not easily cause pollution; the synthesis process is simple; dispersibility is good; a lot of wrinkles exist on the surface; the specific surface area is large; the microspheres can be recycled and can be repeatedly used; and the utilization rate can be improved. The invention further provides the application of the chitosan microspheres in adsorption of the anionic surfactant.

Description

technical field [0001] The invention relates to the field of novel adsorbent synthesis, and relates to a method and application for preparing the adsorbent by cross-linking calcium chloride and quaternary ammonium salt modified chitosan into microspheres. Background technique [0002] Textile industry, catering industry, tanneries, chemical plants, daily life, etc. will release a large amount of wastewater containing anionic surfactants. Among the most widely sold surfactants in the market, linear alkylbenzene sulfonates (LAS) account for 30-35% of the global total of such surfactants and are mainly used in household and industrial detergents. Anionic surfactants are biodegradable substances. LAS will inhibit the degradation of other toxic substances, foam in water and reduce the reoxygenation rate and degree of oxygenation in water, resulting in eutrophication of water bodies. LAS can also emulsify other pollutants in water, increase the concentration of pollutants, increa...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28C02F1/28C02F101/30
CPCB01J20/24C02F1/286B01J20/28021C02F2101/301
Inventor 朱琦王爱文邢子鹏
Owner HEILONGJIANG UNIV
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