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Chitosan nano fibrous membrane adsorbing material and preparation method thereof

A technology of chitosan nano and adsorption materials, applied in fiber treatment, fiber chemical characteristics, chemical instruments and methods, etc., can solve the problems of high cost of non-selective adsorption and regeneration, limiting the wide application of activated carbon, and low hydrophilic performance , to achieve the effect of low cost, increased contact area and large adsorption capacity

Inactive Publication Date: 2011-10-19
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Activated carbon has the characteristics of large specific surface area and porosity, but the disadvantages of non-selective adsorption and high regeneration cost limit the wide application of activated carbon in the field of water treatment.
Ion exchange resin has the advantages of large specific surface area, porosity, and high selective adsorption for aromatic hydrocarbon molecules, but the preparation cost is high, the hydrophilicity is low, and the process is complicated

Method used

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  • Chitosan nano fibrous membrane adsorbing material and preparation method thereof
  • Chitosan nano fibrous membrane adsorbing material and preparation method thereof
  • Chitosan nano fibrous membrane adsorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1g of CS was dissolved in 24g of pure trifluoroacetic acid to obtain a CS solution with a concentration of 4wt%. After magnetic stirring at room temperature for 24 hours, a transparent CS spinning solution was obtained, and then stood for defoaming. Adjust the distance between the spinneret connected to the injector and the upper surface of the drum receiver to be 10 cm, set the rotation speed of the drum receiver to 5 rpm, and apply a voltage of 20 kV between the spinneret and the grounded drum receiver. At room temperature, the humidity is 50-80%. Add the CS spinning solution to the syringe of the electrospinning equipment. The CS spinning solution is injected into the spinneret at a flow rate of 0.4ml / h under the action of the syringe pump. The CS nanofiber film is obtained on the receiver, and then dried, for example, in a drying oven at 60-100° C. for 12 hours. The obtained CS nanofibrous membrane was dissolved in an alkaline solution such as sodium carbonate Na at a...

Embodiment 2

[0045] 0.8g of CS was dissolved in 19.2g of pure trifluoroacetic acid to obtain a CS solution with a concentration of 4wt%. After magnetic stirring at room temperature for 24 hours, a transparent CS spinning solution was obtained, and then stood for defoaming. Adjust the distance between the spinneret connected to the injector and the upper surface of the drum receiver to be 15 cm, set the rotation speed of the drum receiver to 5 rpm, and apply a voltage of 25 kV between the spinneret and the grounded drum receiver. At room temperature, the humidity is 50-80%. Add the CS spinning solution to the syringe of the electrospinning equipment. The CS spinning solution is injected into the spinneret at a flow rate of 0.4ml / h under the action of the syringe pump. The CS nanofiber film is obtained on the receiver, and then dried, for example, in a drying oven at 60-100° C. for 12 hours. The obtained CS nanofibrous membrane was dissolved in an alkaline solution such as sodium carbonate N...

Embodiment 3

[0049] 0.8g of CS was dissolved in 19.2g of pure trifluoroacetic acid to obtain a CS solution with a concentration of 4wt%. After magnetic stirring at room temperature for 24 hours, a transparent CS spinning solution was obtained, and then stood for defoaming. Adjust the distance between the spinneret connected to the injector and the upper surface of the drum receiver to be 15 cm, set the rotation speed of the drum receiver to 5 rpm, and apply a voltage of 10 kV between the spinneret and the grounded drum receiver. At room temperature, the humidity is 50-80%. Add the CS spinning solution to the syringe of the electrospinning equipment. The CS spinning solution is injected into the spinneret at a flow rate of 0.1ml / h under the action of the syringe pump. The CS nanofiber film is obtained on the receiver, and then dried, for example, in a drying oven at 60-100° C. for 12 hours. The obtained CS nanofibrous membrane was dissolved in an alkaline solution such as sodium carbonate N...

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Abstract

The invention relates to a chitosan nano fibrous membrane adsorbing material and a preparation method thereof. The preparation method for the chitosan nano fibrous membrane adsorbing material comprises the steps as follows: chitosan spinning liquid is added into electrostatic spinning equipment; a chitosan nano fibrous membrane is prepared by an electrostatic spinning method; and the obtained chitosan nano fibrous membrane is soaked into alkaline liquid, and then is cleaned and dried to obtain the chitosan nano fibrous membrane adsorbing material. The average diameter of the nano fiber for forming the adsorbing material is 10-600nm; and the porosity of the adsorbing material is 15-60 percent. The adsorbing material has the characteristics of biocompatibility, biodegradability, hydrophilicity, low cost, large adsorption capacity and broad material sources. The adsorbing material can effectively absorb heavy metal ions comprising Cu (II), Hg (II), Cd (II) and Pb (II).

Description

technical field [0001] The invention relates to the field of adsorption materials, in particular to a chitosan (CS) nanofiber membrane adsorption material capable of efficiently adsorbing heavy metal ions. Background technique [0002] Wastewater discharged from mining, smelting, electrolysis, electroplating, pesticides and other industries often contains heavy metals, which is one of the causes of water pollution. Heavy metals are not easy to degrade in aqueous solution, and when they enter the food chain, they pose a great threat to human life. Eating foods containing excessive cadmium can easily cause nausea, vomiting, diarrhea, and abdominal pain. Lead compounds mainly affect the nervous system, kidney and blood system, and affect children's intellectual development. The harm of mercury to the human body is mainly manifested as headache, dizziness, numbness and pain in the limbs. The methylmercury in mercury is easily absorbed by the liver and kidney in the human body,...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30D01D5/00D04H1/72D01F9/00
Inventor 吴大勇李东周操建华
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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