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Modified cellulose material for adsorbing heavy metal ions and organic pollutants and preparation method thereof

A technology for organic pollutants and heavy metal adsorption, which is applied to amidoxime-hydroxymidoxime modified cellulose materials and preparation, modified cellulose materials and preparation fields, and achieves the effects of strong adsorption capacity, easy mass production and rough surface structure

Active Publication Date: 2015-03-25
扬州市新晟铭通信网络技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both amidoxime and amidoxime groups have the functions of enrichment and separation of precious metals and rare metals, wastewater purification, and test and analysis of trace metal elements. If cellulose is used as a carrier, the material will combine high selectivity of amidoxime groups The porosity, large specific surface area and high mechanical strength of cellulose and cellulose carrier have advantages, but so far, there is no report about the technical scheme of amidoxime group and ahydroxylamine oxime group existing in cellulose at the same time, how to combine amidoxime Simultaneously grafting of hydroxylamine and oxime groups onto natural polymer cellulose has become an urgent problem to be solved in the research and development of functional cellulose polymer materials

Method used

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  • Modified cellulose material for adsorbing heavy metal ions and organic pollutants and preparation method thereof
  • Modified cellulose material for adsorbing heavy metal ions and organic pollutants and preparation method thereof
  • Modified cellulose material for adsorbing heavy metal ions and organic pollutants and preparation method thereof

Examples

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Effect test

Embodiment 1

[0026] See attached figure 1 , is the flow chart of the preparation of the modified cotton fiber material in this embodiment. Reaction (1) is under the action of composite initiator cerium ammonium nitrate and azobisisobutyronitrile, 2-cyano-3-ethoxyethyl acrylate is grafted onto the alkalized cotton fiber; reaction (2) is the The graft copolymer undergoes amidoximation transformation under the action of hydroxylamine hydrochloride and sodium carbonate, the cyano group is converted into amidoxime group, and the ester bond is converted into hydroxylamine oxime group, so the finished product contains both amidoxime group and Modified cotton fiber material containing hydroxamidoxime groups. The concrete steps of preparation method are as follows:

[0027] (1) Cotton fiber alkalization: Weigh 5g of cotton fiber, put it in 250mL NaOH solution with a concentration of 1wt%, and scorch at 85°C for 120min, take out the filtered water and transfer it to 150mL NaOH solution with a conc...

Embodiment 2

[0034] (1) Alkalization of viscose fiber: Weigh 5g of viscose fiber, put it in 100mL of NaOH solution with a concentration of 4wt%, simmer at 90°C for 90min, take out the filtered water and transfer it to 250mL of NaOH solution with a concentration of 12wt%. Stir at 25°C for 90 minutes, and the product is filtered, washed with deionized water, and dried to obtain alkalized viscose fiber.

[0035] (2) Graft copolymerization: Take 2g of the above-mentioned alkalized viscose fiber and place it in a four-necked flask filled with 60mL of isopropanol solution. - Ethoxy ethyl acrylate magnetically stirred for 15min, then added 0.01g of cerium ammonium nitrate and 0.008g of azobisisobutyronitrile into the above reaction solution, continued to stir and react for 2h, took out and filtered, washed with methanol, deionized water, 50 Dry at ℃ to obtain graft copolymerized viscose fiber.

[0036] (3) Ammoximation: Dissolve 4g of hydroxylamine hydrochloride and 2.3g of sodium hydroxide in m...

Embodiment 3

[0038] (1) Alkalinization of microcrystalline cellulose: Weigh 5g of microcrystalline cellulose, put it in 150mL of NaOH solution with a concentration of 2.5wt%, scorch at 100°C for 60min, take out the filtered water and transfer to 100mL of NaOH with a concentration of 25wt% The solution was stirred at 30°C for 75 minutes, and the product was filtered, washed with deionized water, and dried to obtain alkalized microcrystalline cellulose.

[0039] (2) Graft copolymerization: Take 2g of the above-mentioned alkalized microcrystalline cellulose and place it in a four-necked flask filled with 80mL of methanol solution. Ethoxyethyl acrylate was magnetically stirred for 45 minutes, then 0.05g of cerium ammonium nitrate and 0.05g of azobisisobutyronitrile were added to the above reaction liquid, and the stirring reaction was continued for 6 hours, and then washed with methanol, deionized water, and 50°C drying to obtain graft copolymerized microcrystalline cellulose.

[0040] (3) Am...

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Abstract

The invention discloses a modified cellulose material for adsorbing heavy metal ions and organic pollutants and a preparation method thereof. The preparation method comprises the following steps of: by taking cellulose as a raw material, carrying out alkali activation to obtain alkalized cellulose; by taking ammonium ceric nitrate and azodiisobutyronitrile as composite initiating agents, grafting monomer ethyl 2-cyano-3-ethoxyl acrylate to the alkalized cellulose; carrying out amidoximation modification on the alkalized cellulose by adopting a hydroxylamine solution to prepare the modified cellulose material which contains an amidoxime group and a hydroxylamine oxime group. The preparation method disclosed by the invention has the advantages of simple preparation process, easiness for operation control and convenience for batch production, and the raw material is low in cost and easy to obtain; in addition, the modified cellulose material disclosed by the invention can be used for adsorbing the heavy metal ions and the organic pollutants which are contained in waste water.

Description

technical field [0001] The invention relates to a modified cellulose material for absorbing heavy metal ions and organic pollutants and a preparation method thereof, in particular to an amidoxime-hydroxylamine oxime modified cellulose material and a preparation method, belonging to the technical field of functional polymer materials. Background technique [0002] In recent years, environmental and resource issues have become increasingly tense. On the one hand, water pollution represented by heavy metal ions and organic pollutants has become increasingly severe; on the other hand, non-renewable resources represented by coal and oil have limited reserves, and their development and utilization It has a bad impact on the ecological environment. In order to solve the above problems, adhering to the concepts of "green chemistry" and "ecological harmony", researchers have turned their attention to natural polymer resources. As a fibrous, multi-capillary, stereoregular biomass reso...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28
CPCB01J20/24B01J2220/4825C02F1/286C02F2101/20C02F2101/30
Inventor 焦晨璐陈宇岳熊佳庆陶金林红
Owner 扬州市新晟铭通信网络技术有限公司
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