Modified Corchorus capsularis polysaccharide, preparation and application thereof

An adsorbent, jute technology, applied in the field of removing hexavalent chromium ions in water with jute extract as the adsorption material, can solve the problems of difficult promotion, low added value, difficult storage and transportation of jute leaves and young shoots, and achieve low cost, Effect of accelerating electrostatic bonding and reducing cost

Inactive Publication Date: 2016-05-04
湖南广播电视大学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Using jute leaves and young shoots as adsorption materials to remove hexavalent chromium in water has outstanding features such as low price, high efficiency, and simple operation, but jute leaves and young shoots are not easy to store and transport, and the added value is low, so it is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 prepares jute polysaccharide

[0039](1) two weeks before the florescence, harvest the leaves and tender shoots of "Zhongjute No. 4" (long-fruited jute cultivar); , dried in an oven at 40°C to constant weight;

[0040] (2) pulverize with ultrafine pulverizer, cross 100 mesh screen sieves, obtain the jute blade and the tender arbor tissue powder (abbreviated as jute powder in the following steps) that particle diameter is 0.15mm.

[0041] (3) add 10 times of weight deionized water in jute powder, stir, add 1% cellulase, 0.8% hemicellulase, 1.5% pectinase, 1.0% carboxypeptidase, enzymolysis process is in super Carry out in a critical carbon dioxide fluid, the specific method is: put the jute powder to be enzymolyzed into the high-pressure reactor, pump in carbon dioxide, start timing when the pressure is 10.0MPa and the temperature is 55°C, the enzymolysis reaction time is 3.5h, and the enzymolysis reaction time is 3.5 hours. After completion, the reaction ...

Embodiment 2

[0046] Embodiment 2 introduces ferric ion to jute polysaccharide, makes jute polysaccharide-iron complex

[0047] (1) jute polysaccharide is dissolved in the ferric chloride aqueous solution that concentration is 0.3mol / L, and the mass ratio of described ferric chloride solution and jute polysaccharide is 10:1, after stirring at room temperature 30min, filter to obtain solid phase;

[0048] (2) After the solid phase was washed with deionized water, a 15% epichlorohydrin solution was added to carry out cross-linking at room temperature. The mass ratio of the cross-linking agent to the solid phase was 8:1, and the cross-linking reaction was 60 min;

[0049] (3) The solid phase of step (2) was filtered, washed with water for 30 min, dehydrated by grades with 50%, 75% and 100% ethanol, separated and dried to obtain jute polysaccharide-iron complex.

Embodiment 3

[0050] Embodiment 3 utilizes jute polysaccharide-iron complex to remove Cr(Ⅵ) in potassium dichromate solution

[0051] (1) Get 100mL of potassium dichromate solution whose mass concentration of Cr(Ⅵ) is 200mg / L, and use HNO with a mass fraction of 60%-68% 3 and saturated NaOH to adjust the pH to 5;

[0052] (2) Add 1.5 g of jute polysaccharides to the sewage to be treated in (1), place on a stirrer and stir for 30 min at a speed of 150 r / min.

[0053] (3) Effect verification: 1.4 mL of the mixed solution was taken out, centrifuged (15000 r / min) for 2 min, and the supernatant was taken to measure the concentration of Cr(VI). The concentration of Cr(Ⅵ) in the solution was determined by diphenylcarbazide spectrophotometry (GB7467-1987), and the concentration of total chromium was determined by potassium permanganate oxidation-diphenylcarbazide spectrophotometry. Each test was repeated three times, and the average of the results was taken.

[0054] The test results showed that...

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Abstract

The present invention relates to a solid adsorbent and a preparation method thereof, and more particularly to an adsorbent material using Corchorus capsularis polysaccharide as a main component and a preparation method thereof. Corchorus capsularis leaves and young shoots have excellent performance of removal of hexavalent chromium in water, because the cells are rich in pectin and other polysaccharides. -OH and -NH2 groups of the polysaccharides are typical of alkaline groups, and due to this special structure, the polysaccharides have chelation with metal ions with certain ionic radius under certain pH value, and are a natural metal chelator. The present invention uses leaves and young shoots of Corohorus olitorius as the raw materials, and separates the rich pectin and other polysaccharides by using physical and chemical means; and the obtained material has good adsorption effect. The invention has the advantages of simple operation, low cost, easiness to implement commercialization, and increase of the added value of the traditional fiber crop Corohorus olitorius.

Description

technical field [0001] The invention belongs to the field of sewage treatment containing heavy metal ions, and in particular relates to a method for removing hexavalent chromium ions in water by using jute extract as an adsorption material. Background technique [0002] Since the discovery of the metal element chromium at the end of the 18th century, chromium and its compounds have been widely used in industrial production, and have become indispensable raw materials for metallurgy, metal processing, electroplating, leather making, paint, printing and dyeing, pharmaceuticals, photographic plate making and other industries. This produces large amounts of chromium-containing wastewater. Chromium exists mainly in the form of Cr(Ⅲ) and Cr(Ⅵ) in nature, Cr(Ⅲ) is an essential trace element for human body, and water-soluble Cr(Ⅵ) is listed as the eight most harmful to human body One of the chemical substances, it is one of the three internationally recognized carcinogenic metals, ...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/22
CPCB01J20/24B01J2220/44B01J2220/4825C02F1/286C02F2101/22
Inventor 温岚姚昱旻
Owner 湖南广播电视大学
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