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An electrostatically spun chitosan nano-fiber film for adsorption of heavy metal ions and a preparation method thereof

A technology of chitosan nanometer and adsorption of heavy metals, which is applied in the direction of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc. High cost and other issues, to achieve the effect of more internal pores, increase the contact area, and shorten the time

Inactive Publication Date: 2013-09-11
SUZHOU ZHENGYECHANG INTELLIGENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many ways to remove heavy metal ions in water. Traditional methods include chemical precipitation, redox, ferrite, electrolysis, evaporation and concentration, and ion exchange resin. Management is troublesome, and it will produce secondary pollution and cannot solve the problems of metal and water resource reuse.

Method used

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  • An electrostatically spun chitosan nano-fiber film for adsorption of heavy metal ions and a preparation method thereof
  • An electrostatically spun chitosan nano-fiber film for adsorption of heavy metal ions and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Select the shell polycan with LG dehydrate of 70%and a molecular weight of 200,000, dissolved in 19g triathoacetic acid, ultrasonic treatment for 1h, and obtain a shell polycan solution with a mass of 5%.

[0019] (2) Add the above spinning liquid to the static spinning device, use electrostatic spinning legal system to prepare the shell polyanan nanofiber membrane, and the process of static spinning is: voltage 15kV, spinning distance 10cm, spinning solution into inQuantity 0.5ml / h;

[0020] (3) Immersed the shell polytanan nanofiber membrane prepared by the static spinning legal system in Nahco of 1mol / L 3 After soaking for 24h in the solution, a neutral and chitosan nano -fiber membrane is obtained.

[0021] The average diameter of the obtained steps (2) the obtained shell glycogen nanofibilities is 88nm, and the pore rate is 69%.

[0022] Step (3) The obtained shell polytal nanofibiliated membrane to CU 2+ The adsorption amount is 328mg / g, for PB 2+ The adsorption a...

Embodiment 2

[0025] (1) Select a chitosan with a LG dehydrate of 75%and a molecular weight of 220,000. It is dissolved in 24g of triathide, and the ultrasonic treatment is 1.5h to obtain a shell poly glycogen solution with a mass ratio of 4%;

[0026] (2) Add the above spinning fluid into the static spinning device, use electrostatic spinning legal system to prepare the shell polynan nanofiber membrane, and the process of static spinning is: 20kV of the voltage, 15cm spinning distance, spinning solution into it1ml / h;

[0027] (3) Immersed the shell polytanan nanofiber membrane prepared by the static spinning legal system in Nahco of 1mol / L 3 After soaking for 24h in the solution, a neutral and chitosan nano -fiber membrane is obtained.

[0028] The average diameter of the obtained steps (2) obtained by the obtained shell polytanan nanofibilities is 142nm, and the pore rate is 52%.

[0029] Step (3) The obtained shell polytal nanofibiliated membrane to CU 2+ The adsorption amount is 183mg / g, fo...

Embodiment 3

[0032] (1) Select the shell poly glycogen with an LG acetylness of 80%and a molecular weight of 250,000. It is dissolved in 32.3g of trifluoroetic acid.

[0033] (2) Add the above spinning fluid into the static spinning device, use electrostatic spinning legal system to prepare the shell polyanan nanofiber membrane, and the process of static spinning is: voltage 25kV, spinning distance 15cm, spinning liquid into it intoQuantity 1.5ml / h;

[0034] (3) Immersed the shell polytanan nanofiber membrane prepared by the static spinning legal system in Nahco of 1mol / L 3 After soaking for 24h in the solution, a neutral and chitosan nano -fiber membrane is obtained.

[0035] The average diameter of the obtained steps (2) the obtained shell polytanan nanofibilities is 108nm, and the pore rate is 64%.

[0036] Step (3) The obtained shell polytal nanofibiliated membrane to CU 2+ The adsorption amount is 209mg / g, for PB 2+ The adsorption amount is 68mg / g.

[0037] Example 4:

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Abstract

The present invention relates to an electrostatically spun chitosan nano-fiber film for adsorption of heavy metal ions and a preparation method thereof. The preparation method comprises the following steps of: (1) dissolving chitosan with a degree of deacetylation of between 70% to 80% and a molecular weight of between 200,000 to 300,000 in trifluoroacetic acid, and obtaining an uniformly dissolved spinning solution after ultrasonic treatment for 1-2h; (2) adding the above spinning solution into an electrostatic spinning device and preparing chitosan nano-fiber film through an electrostatic spinning method; and (3) immersing the obtained chitosan nano-fiber film in a 1mol / L of NaHCO3 solution for 24h at room temperature, and obtaining neutralized chitosan nano-fiber film after washing and drying. The electrostatically spun chitosan nano-fiber film provided by the invention has the characteristics of a large specific surface area, a high porosity, abundant inside pores, etc.; the contact area with metal ions and the absorption capacity can be increased and the time to reach adsorption equilibrium is shortened, thus the electrostatically spun chitosan nano-fiber film can effectively adsorb heavy metal ions in wastewater and can be biodegradable, causing no environmental pollution.

Description

Technical field [0001] The present invention is a field of adsorption materials, which specializes in a static spinning piping nanofiber film that can efficiently adsorb heavy metal ions. Background technique [0002] Heavy metal pollution refers to environmental pollution caused by heavy metals or its compounds.Heavy metal pollution can be caused by natural factors (such as soil, rocky weathering, and volcanic eruption), but it is mainly caused by human factors such as mining, industrial manufacturing, sewage irrigation, and use of heavy metal products or metal pollutants.Heavy metals cannot be degraded by biology, but it can be tens of millions of times under the effects of biological amplification of the food chain, and finally enters the human body.Although some heavy metals such as manganese, copper, zinc, etc. are necessary trace elements for life activities, most heavy metals are not necessary for life.Difficulty breathing, liver injury, etc.With the rapid development of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 赵兵
Owner SUZHOU ZHENGYECHANG INTELLIGENT TECH
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