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Dual-network hydrogel adsorbent and preparation method thereof and application of dual-network hydrogel adsorbent as heavy metal absorbent

A hydrogel adsorbent, dual network technology, applied in the directions of alkali metal compounds, chemical instruments and methods, adsorbed water/sewage treatment, etc., to achieve the effects of wide source, increased strength, and short process

Active Publication Date: 2017-08-22
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resource reuse of waste clothes is of great significance, and there are no related reports on the use of old clothes to prepare high-performance double-network hydrogel adsorbents

Method used

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  • Dual-network hydrogel adsorbent and preparation method thereof and application of dual-network hydrogel adsorbent as heavy metal absorbent
  • Dual-network hydrogel adsorbent and preparation method thereof and application of dual-network hydrogel adsorbent as heavy metal absorbent
  • Dual-network hydrogel adsorbent and preparation method thereof and application of dual-network hydrogel adsorbent as heavy metal absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Add 4.0 g of shredded cotton cloth to 48 mL of aqueous sodium hydroxide solution (14% by mass), place in a low-temperature water bath to pre-cool to 0° C., and stir for 1 min. 48mL urea aqueous solution (mass fraction: 24%) was pre-cooled to 0°C and immediately added to the cotton cloth and sodium hydroxide mixture, stirred vigorously for 2min to obtain a viscous cellulose solution.

[0046] (2) Add 1.0 g of acrylamide, 0.0434 g of MBA and 0.0272 g of KPS into 2 mL of deionized aqueous solution, dissolve completely, and obtain a mixed aqueous solution of acrylamide, crosslinking agent and initiator.

[0047] (3) Add 6mL of (1) to (2) and mix evenly, then add 0.0 / 0.2 / 0.3 / 0.4 / 0.5 / 0.6mL of ECH, mix evenly again, place it in a constant temperature oven at 60°C for 2 hours, take it out, Wash with deionized water until neutral, dry to constant weight, and obtain six kinds of cellulose / acrylamide double network hydrogel materials with different crosslinking degrees.

[00...

Embodiment 2

[0050] A certain amount of the six cellulose / acrylamide double-network hydrogel materials prepared in Example 1 was dried in a constant temperature drying oven at 60° C. to a constant weight, and the mass value was recorded. Place the weighed materials in beakers filled with deionized water, and weigh the mass value of the material at intervals of time until the mass value of the material tends to be stable. Calculate the swelling rate of the material at different time points, the results are as follows figure 2 shown. The final swelling rate of each material is shown in Table 1:

[0051] Table 1: Maximum Swelling Rates for Cellulose / Acrylamide Materials

[0052]

[0053]

[0054] It can be seen from Table 1 that the swelling rate of the material decreases with the increase of the crosslinking amount. If the swelling rate is too high, the material will be broken; if the swelling rate is too small, the adsorption effect will not be very good. The best overall performa...

Embodiment 3

[0056] The six kinds of cellulose / acrylamide double network hydrogel materials without drying prepared in Example 1 were tested for compressive properties with a universal testing machine, and the stress-strain curves were as follows: image 3 shown. The turning point of stress drop in the figure is the breaking point of the material, and the corresponding deformation is the maximum deformation value of the material. The results show that all six materials have good mechanical properties.

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Abstract

The invention discloses a dual-network hydrogel adsorbent and a preparation method thereof and an application of the dual-network hydrogel adsorbent as a heavy metal absorbent. The preparation method of the dual-network hydrogel adsorbent comprises the steps of dissolving abandoned cotton cloth into a sodium hydroxide / urea solvent system to obtain a cellulose solution; and mixing the cellulose solution with a solution containing acrylamide, a cross-linking agent and an initiator evenly and carrying out cross-linking and polymerization reaction to obtain the hydrogel which is good in mechanical property and rich in active functional group, and has a crosslinked cellulose and polyacrylamide dual network and a three-dimensional porous structure. The method is simple in operation, low in cost and beneficial to large-scale production; and the prepared dual-network hydrogel adsorbent is used for adsorbing heavy metal ions in water, has the advantages of being small in additive amount, high in adsorption rate and large in adsorbing capacity, and can be applied to treatment of various wastewater containing heavy metal ions.

Description

technical field [0001] The present invention relates to a double-network hydrogel, in particular to a double-network hydrogel with cross-linked cellulose and polyacrylamide and a preparation method thereof, and the use of the double-network hydrogel as a heavy metal adsorbent in the treatment of heavy metal-polluted wastewater The application belongs to the field of environmental functional materials and water treatment new technologies. Background technique [0002] Industrial mining, heavy metal smelting, electroplating, printing, dyeing, chemical processing, leather manufacturing, and the rapid development of some high-tech industries have intensified the discharge of industrial wastewater containing heavy metals. Many natural water bodies and drinking water sources have also been polluted to varying degrees, and eventually affect the human body. healthy. At present, domestic and international water heavy metal pollution remediation and treatment methods mainly include c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08J3/075C08L1/02C08L33/26C08K5/1515C08F220/56C08F222/38B01J20/24B01J20/28B01J20/30C02F1/28
CPCB01J20/24B01J20/28047C02F1/286C08F220/56C08J3/075C08J3/246C08J2301/02C08J2433/26C08L1/02C08L2312/00C08F222/385C08L33/26C08K5/1515
Inventor 刘玉堂马建洪魏元峰张园梦刘承斌
Owner HUNAN UNIV
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