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Preparation method of fiber membrane material for heavy metal ion adsorption

A technology for absorbing heavy metal ions and fibers, which is applied in the fields of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., to achieve enhanced adsorption effect and easy operation

Pending Publication Date: 2021-11-05
GUIZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic research on the adsorption of heavy metals by extracellular polymers focuses on the adsorption effect of extracellular polymers extracted from specific bacteria on heavy metals. Material not reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The agricultural straw waste rice straw is cut and crushed, and the straw fiber with a particle size of 40 mesh is taken, and then impregnated with 30% hydrogen peroxide, and at the same time combined with ozone aeration and ultrasonic induction to convert hydrogen peroxide into hydroxyl radicals, so that the fibers are regenerated. The connection obtained a white rice straw fiber sponge composed of multi-layered thin fiber network, which was then dried at 50 °C to constant weight. Dissolve glucomannan powder in water, stir until dissolved to obtain a homogeneous glucomannan solution, then add sodium hydroxide to the solution to adjust the pH value to 10, and continue stirring for 0.5h to obtain deacetylated glucomannan sugar solution. Immerse the white fiber sponge obtained above in deionized water until the white fiber sponge is completely wetted, then add extracellular polymer, and sodium carbonate to it and stir vigorously for about 1 hour, then add deacetylated glu...

Embodiment 2

[0027] The agricultural straw waste corn stalks are cut and crushed, and the straw fibers with a particle size of 50 mesh are taken, and then impregnated with 20% concentration of hydrogen peroxide. The connection obtained a white cornstalk fiber sponge composed of multilayer thin fiber network, which was then dried at 60 °C to constant weight. Dissolve glucomannan powder in water, stir until dissolved to obtain a homogeneous glucomannan solution, then add potassium hydroxide to the solution to adjust the pH value to 11, and continue stirring for 0.5h to obtain deacetylated glucomannan sugar solution. Immerse the white fiber sponge obtained above in deionized water until the white fiber sponge is completely wetted, then add extracellular polymer and sodium carbonate to it and stir vigorously for about 2 hours, then add deacetylglucomanne to the mixed solution The polysaccharide was stirred continuously and vigorously at 80 °C for 3 h to obtain a white mixture. Add alginic ac...

Embodiment 3

[0030] The bagasse, the agricultural straw waste, is cut and crushed, and the straw fibers with a particle size of 80 mesh are taken, and then impregnated with 25% concentration of hydrogen peroxide. The connection yielded a white bagasse fiber sponge consisting of multilayered thin fiber networks, which was then dried at 70 °C to constant weight. Dissolve glucomannan powder in water, stir until dissolved to obtain a homogeneous glucomannan solution, then add sodium hydroxide to the solution to adjust the pH value to 12, and continue stirring for 0.5h to obtain deacetylated glucomannan sugar solution. Immerse the white fiber sponge obtained above in deionized water until the white fiber sponge is completely wetted, then add extracellular polymer and sodium carbonate to it and stir vigorously for about 3 hours, then add deacetylglucomanne to the mixed solution The polysaccharide was stirred continuously and vigorously at 70 °C for 5 h to obtain a white mixture. Add alginic ac...

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Abstract

The invention discloses a preparation method of a fiber membrane material for heavy metal ion adsorption based on agricultural straw waste. The preparation method comprises the following steps: cutting off and crushing the agricultural straw waste, and pretreating straw fibers with particle sizes in a range of 20-100 meshes to obtain white fiber sponge consisting of a plurality of layers of thin fiber networks; then, with the straw fiber sponge as a base material, modifying the straw fiber sponge with an extracellular polymeric substance (EPS), modified gulcomannan and alginic acid to form a thermal irreversible gel mixture with excellent film forming performance, wherein carbon dioxide generated by a reaction of sodium carbonate and alginic acid can make cavities of the fiber membrane material richer; and finally, carrying out suction filtration, drying and curing to obtain the high-performance fiber membrane material for heavy metal ion adsorption. The high-performance fiber membrane material which has good filtering performance, has high adsorption and removal effects on heavy metal ions, and has the characteristics of renewable biomass, environment friendliness, good responsiveness and the like is prepared in the invention.

Description

technical field [0001] The invention relates to the field of purification and treatment of sewage containing various heavy metals and the field of resource utilization of waste, in particular to a heavy metal ion adsorption fiber membrane based on two kinds of solid waste based on extracellular polymers of agricultural straw waste and activated sludge waste The method of preparation of the material. Background technique [0002] In recent years, the research and engineering application of polymer materials has gradually shifted to functional fiber composite materials. These composite materials mainly include composite materials such as carbon fiber, aramid fiber and glass fiber, and have been widely used in aerospace, transportation, construction, environmental protection and other fields. However, these types of composite materials have some serious disadvantages, such as the recycling problem of this material, the post-processing problem and the sustainable development pr...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/262B01J20/24B01J20/22B01J20/28038C02F1/286B01J2220/4825C02F2101/20
Inventor 李森徐乃姣
Owner GUIZHOU NORMAL UNIVERSITY
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