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Supercritical extraction method for jute polysaccharide and application of jute polysaccharide

A jute and polysaccharide technology, which is applied in other chemical processes, water/sludge/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems of low added value, difficult preservation and transportation of jute leaves and young shoots, and difficulty in promotion. , to achieve the effect of low cost, superior adsorption performance and cost reduction

Inactive Publication Date: 2016-04-20
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 not easy to popularize. The present invention provides A method for extracting the active ingredient-jute polysaccharide from jute leaves and shoots, which can realize waste utilization, increase the added value of jute, and provide a new material for the treatment of Cr(Ⅵ)-containing sewage

Method used

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  • Supercritical extraction method for jute polysaccharide and application of jute polysaccharide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 prepares jute polysaccharide

[0035] (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;

[0036] (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.

[0037] (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

[0042] Embodiment 2 utilizes jute polysaccharide to remove Cr in the solution (Ⅵ)

[0043] (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;

[0044] (2) Add 1.5 g of jute polysaccharides to the sewage to be treated in (1), place on a stirrer and stir for 60 min at a speed of 150 r / min.

[0045] (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.

[0046] The test results showed that after the jute polysaccharid...

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Abstract

The invention belongs to solid adsorbents and preparing methods thereof and particularly relates to an adsorbing material with jute polysaccharide as a main ingredient and a preparing method of the adsorbing material. Leaves and tender shoots of jute have excellent performance on removing hexavalent chromium in a water body, tissue cells contain rich pectin and other polysaccharide substances, and groups such as -OH and -NH2 in the polysaccharide are typical basic groups, so that by means of the special structure, the polysaccharide has chelate action on metal ions with certain ion radiuses under certain PH value conditions, and the polysaccharide is a natural metal chelator. According to the adsorbing material and the preparing method thereof, the leaves and the tender shoots of corchorus olitorius serve as raw materials, rich pectin and other polysaccharide substances in the leaves and the tender shoots are separated out through physical and chemical means, obtained substances are good in adsorbing effect, operation is easy, cost is low, commercialization is easy to achieve, and the additional value of jute as a traditional fiber crop is increased.

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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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
CPCB01J20/24B01J2220/44B01J2220/4825C02F1/286
Inventor 温岚姚昱旻
Owner 湖南广播电视大学
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