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A kind of preparation method and application of spongy metal cross-linked chitosan adsorbent

A technology of metal cross-linking and chitosan, which is applied in the fields of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of inability to realize dye recycling, non-reusable, small adsorption capacity, etc., and achieve Short removal time, low cost, and large adsorption capacity

Inactive Publication Date: 2019-09-27
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the disadvantages of small adsorption capacity, difficult separation, non-reusable use, and inability to realize dye recycling in existing adsorbents, and provide a preparation method of a spongy metal cross-linked chitosan adsorbent, and Application of this adsorbent to remove anionic dyes in wastewater

Method used

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  • A kind of preparation method and application of spongy metal cross-linked chitosan adsorbent
  • A kind of preparation method and application of spongy metal cross-linked chitosan adsorbent
  • A kind of preparation method and application of spongy metal cross-linked chitosan adsorbent

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Experimental program
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Effect test

Embodiment 1

[0030] Weigh 4.34g of tetrabutyl titanate solution, add 6mL of concentrated hydrochloric acid to fully dissolve it; after removing the upper organic layer, add water to 100mL. Weigh 2g of chitosan powder, slowly add it into the titanium hydrochloric acid solution, stir for 1h, fully dissolve the chitosan powder and make a homogeneous solution. Adjust the pH value to neutral with 1M NaOH solution, add 5 mL of 5% glutaraldehyde as a cross-linking agent, continue stirring for 2 h, and store in refrigerator at 4 °C overnight. Put the mixed solution into a sprayer, spray it into liquid nitrogen to obtain a white solid, redissolve the solid with 50% ethanol-water mixture, stir for 0.5 h, wash with water for 3 to 4 times, and obtain a colloidal solution. After setting the shape with a square mold colloidal solution, it was frozen and stored, and then it was freeze-dried to obtain a spongy metal titanium cross-linked chitosan adsorbent (see figure 1 ). From figure 1 It can be seen ...

Embodiment 2-11

[0032] The application of spongy metallic titanium cross-linked chitosan adsorbent to the adsorption of anionic dyes in water was studied, and the anionic dyes were selected as Orange II. Adjust the pH of different solutions (pH = 2, 3, 4, 5, 6, 7, 8, 9, 10, 11), fix the initial concentration of Orange II at 100 mg / L, carry out the adsorption reaction at room temperature for 2 hours, and the adsorption curve See details figure 2 . Depend on figure 2 It can be seen that the adsorbent has a good adsorption capacity for Orange II under acidic conditions, and the optimum pH value is 2; while under neutral or alkaline conditions, the adsorbent has almost no adsorption effect on Orange II dyes, and this phenomenon is The recovery of the dye and the reuse of the adsorbent create conditions.

Embodiment 12~19

[0034] In a solution with a pH of 2, change the initial concentration from 30 mg / L to 300 mg / L to investigate the effect of the adsorbent on the dye adsorption capacity at different initial concentrations, see Table 1 for details.

[0035] Table 1: Adsorption capacities of adsorbents for Orange II dye at different initial concentrations

[0036]

[0037] As can be drawn from Table 1, at different initial concentrations, the adsorption solution of the adsorbent to Orange II increases continuously with the increase of the initial concentration, and the maximum adsorption capacity is as high as 1143 mg / g; and at the selected initial concentration, the adsorbent The scavenging rate of dyes is greater than 80%; when the initial concentration is less than 100mg / L, the adsorption time is 2 hours, and the scavenging rate is as high as 97%. According to the above data, the spongy metal titanium cross-linked chitosan adsorbent has a good adsorption effect on anionic orange II dye, an...

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Abstract

The invention belongs to the field of environmental functional materials and relates to a preparation method and application of a spongy metal cross-linked chitosan adsorbent. The adsorbent is a composite material formed by cross-linking compositing of transition-state metal ions and chitosan and is spongy, the transition-state metal ions are metal salt solution, and content of the metal ions in the composite material is 10-30% of weight percent. The adsorbent is applied in adsorption of anionic dye in wastewater, and the adsorbent is small in adding amount, short in time for reaching adsorption balance, high in adsorption capacity, easy to separate, renewable and reusable. The spongy metal cross-linked chitosan adsorbent prepared by the method is high in acid resistance, high in adsorption capacity and supportive of direct separation; the adsorbent is simple in dye wastewater removing process, environment-friendly and low in cost and has great application prospect in the field of wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials, in particular to a preparation method and application of a spongy metal cross-linked chitosan adsorbent. Background technique [0002] With the continuous development of textile, leather and other industries, a large amount of dye wastewater is discharged into the water environment. Due to the variety of industrial dyes and complex components; moreover, synthetic dyes are resistant to biodegradation and photodegradation and are difficult to remove from water bodies, thereby interfering with and destroying the biological growth environment in water bodies and causing serious water pollution. Therefore, the treatment and recycling of dye wastewater is of great significance to the sustainable development of enterprises and environmental protection. [0003] At present, the commonly used dye wastewater treatment methods in industry mainly include physical, chemical and bio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/30
Inventor 张玲帆翟孟晋刘鑫张文清朱天懿高杰夏玮徐志珍孙黄辉
Owner EAST CHINA UNIV OF SCI & TECH
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