Jute Polysaccharide Prepared by Steam Explosion and Its Application

A jute and polysaccharide technology, applied in other chemical processes, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as difficult promotion, difficult storage and transportation of jute leaves and young shoots, and low added value. Achieve the effect of low cost, low cost and easy commercialization

Inactive Publication Date: 2018-03-06
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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  • Jute Polysaccharide Prepared by Steam Explosion and Its Application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 extracts jute polysaccharide with fresh jute tissue

[0052] (1) Harvest the leaves of long-fruited jute "Zhongjute No. 4" and the tender shoot tissue of 15cm below the stem tip before flowering, clean the fresh tissue, and crush it with a beater;

[0053] (2) Add acetic acid with a concentration of 5% to the slurry in an amount of 15% of the mass of the raw material, and stir for 60 min at room temperature;

[0054] (3) Put the above-mentioned raw materials into a high-pressure steam reactor, set the burst pressure to 1.5MPa, and hold the pressure for 8 minutes;

[0055] (4) After the steam explosion is completed, filter through the quartz sand to collect the blasting slag;

[0056] (5) 25% acetic acid is used to extract steam-exploded slag at room temperature for 1 hour, and filter to obtain the extract;

[0057] (6) Collect the precipitate: add 5% saturated cetylpyridinium chloride by volume to the leach solution obtained in step (5), collect the preci...

Embodiment 2

[0059] Embodiment 2 extracts jute polysaccharide with dried jute tissue

[0060] (1) Harvest the leaves and young shoots before the flowering of long-fruited jute. The young shoots are the stem tip tissue of about 15 cm from the top of the main stem of the plant. After the leaves and young shoots are air-dried, they are dried in an oven at 35-50°C to constant weight. ;

[0061] (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.

[0062] (3) in the jute powder that step (2) makes, add the acetic acid of concentration 5%, the quality of addition and raw material (jute powder) is equal, stirs 60min under normal temperature;

[0063] The remaining steps are the same as those in Example 1, and will not be repeated here.

Embodiment 3

[0064] Embodiment 3 utilizes jute polysaccharide to remove Cr(Ⅵ) in potassium dichromate solution

[0065] (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;

[0066] (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.

[0067] (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 (GB 7467-1987), 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.

[0068] The test results showed that after the j...

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Abstract

The invention belongs to a solid adsorbent and a preparation method thereof and relates to an adsorption material with ephedran as a main component and a preparation method thereof. Corchorus olitorius leaves and young shoots have excellent effects of removing hexavalent chromium in water because histocyte is rich in polyose substances such as pectin, -OH and -NH2 groups of polyose are typical basic groups and the special structures have chelation effects on metal ions with a certain ion radius at a certain pH value so that the polyose substances are natural metal chelate agents. Corchorus olitorius leaves and young shoots are used as raw materials and a large amount of polyose substances such as pectin are separated through physical and chemical processes. The separated substance has good adsorption effects, can be processed simply, has a low cost, easily realizes commercialization and improves added value of corchorus olitorius as the traditional fiber crop.

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 Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
CPCB01J20/24B01J2220/4825C02F1/286C02F2101/22
Inventor 温岚姚昱旻
Owner 湖南广播电视大学
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