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Preparation and application of adsorbent with jute as raw material

A jute and raw material technology, applied in the direction of adsorption water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of low added value, difficult promotion, intolerance to storage of jute leaves and young shoots, etc. , to achieve the effect of a wide range of sources and low cost

Inactive Publication Date: 2016-04-13
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. However, jute leaves and young shoots are not resistant to storage, difficult to store and transport, and have low added value, so it is not easy to promote , the present invention provides a method for extracting effective components from jute leaves and shoots - jute polysaccharides, which can realize waste utilization, increase the added value of jute, and provide a new method for the treatment of sewage containing Cr(Ⅵ). Material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1 extracts jute polysaccharide with fresh jute tissue

[0057] (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;

[0058] (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;

[0059] (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;

[0060] (4) After the steam explosion is completed, filter through the quartz sand to collect the blasting slag;

[0061] (5) 25% acetic acid is used to extract steam-exploded slag at room temperature for 1 hour, and filter to obtain the extract;

[0062] (6) Collect the precipitate: add 5% saturated cetylpyridinium chloride by volume to the leach solution obtained in step (5), collect the preci...

Embodiment 2

[0064] Embodiment 2 extracts jute polysaccharide with dried jute tissue

[0065] (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. ;

[0066] (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.

[0067] (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;

[0068] The remaining steps are the same as those in Example 1, and will not be repeated here.

Embodiment 3

[0069] Embodiment 3 introduces ferric ion to jute polysaccharide, makes jute polysaccharide-iron complex

[0070] (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;

[0071] (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;

[0072] (3) The solid phase of the step (2) was filtered, washed with water for 30 min, dehydrated in grades with 50%, 75% and 100% ethanol, separated and dried to obtain the jute polysaccharide-iron complex adsorbent.

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Abstract

The invention belongs to solid adsorbents and preparation methods thereof, and particularly relates to an adsorption material with ephedran as the main ingredient and a preparation method of the adsorption material. The leaves and tender shoots of jute have the excellent performance of removing hexavalent chromium in water due to the fact that tissue cells of the leaves and the tender shoots contain rich polysaccharide substances such as pectin, groups such as -OH and -NH2 in the polysaccharide substances are typical basic groups, and with the special structure, the polysaccharide substances have a chelating effect on metal ions with a certain ionic radius under a certain PH value condition and are a natural metal chelating agent. According to the adsorption material and the preparation method, the leaves and tender shoots of corchorus olitorius serve as raw materials, rich polysaccharide substances such as pectin in the leaves and the tender shoots are separated out by adopting a physical and chemical means, the obtained substances are good in adsorption effect, operation is easy, cost is low, commercialization is easy to achieve, and the additional value of the traditional fiber crop jute 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): B01J20/24B01J20/30C08B37/06C02F1/28C02F1/62
CPCB01J20/24C02F1/286C08B37/0048Y02P20/54
Inventor 温岚姚昱旻
Owner 湖南广播电视大学
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