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A kind of chitosan/persimmon tannin composite material and its preparation method and application in recycling germanium

A composite material and chitosan technology, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve problems such as increased oxygen consumption in water, reduced adsorption capacity, and short treatment cycle, and achieve cost reduction , easy operation and low cost

Active Publication Date: 2019-10-29
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention mainly aims at the problems that persimmon tannin is very soluble in water, which easily causes the soluble substances therein to dissolve, leading to the decrease of adsorption capacity and the increase of oxygen consumption in water. From the point of view of “compositing materials”, select persimmon skin and chitosan that are only used at low levels or are now discarded as raw materials, and study their ability to recover germanium in waste liquid. The method of the invention is simple to operate, environmentally friendly and clean, and has high resource utilization efficiency High, high selectivity to germanium, short processing cycle, and recyclable, has high practical value

Method used

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  • A kind of chitosan/persimmon tannin composite material and its preparation method and application in recycling germanium
  • A kind of chitosan/persimmon tannin composite material and its preparation method and application in recycling germanium
  • A kind of chitosan/persimmon tannin composite material and its preparation method and application in recycling germanium

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 A kind of chitosan / persimmon tannin composite material

[0029] (1) Preparation method

[0030] 1) Take 2g of chitosan (CS) in a three-necked flask, add 40mL of 50% (v / v) ethanol solution, then drop in 4g of epichlorohydrin solution, react at 80°C for 3h, cool, and filter with suction , first wash with ethanol, and then wash with deionized water until neutral to obtain the intermediate product CS-Cl.

[0031] 2) Put 4g of persimmon tannin in another reaction vessel, add 80mL of deionized water, adjust the pH to 10 with NaOH, add the intermediate product CS-Cl, and then heat and stir the mixture at 45°C for 6h, Filter, wash with dilute HCl, and then wash with deionized until neutral. After the product was dried in an oven at 50°C for 24 hours, it was ground and sieved to finally obtain a chitosan / persimmon tannin composite material CS-Cl-PT with a particle size of 100-150 μm.

[0032] (2) Results

[0033] 1) figure 1 Infrared spectra of CS, CS-Cl, CS-Cl...

Embodiment 2

[0035] Embodiment 2 A kind of chitosan / persimmon tannin composite material is to the adsorption effect of germanium under different acidities

[0036] (1) Preparation method

[0037] 1) Take 1.5g, 2g, and 2.5g of chitosan in three three-necked flasks, add 40mL, 50% (v / v) ethanol solution, then drop 4g of epichlorohydrin, and react at 80°C for 3h , cooled, suction filtered, washed with ethanol first, and then washed with deionized water until neutral to obtain the intermediate product CS-Cl.

[0038]2) Put 4 g of persimmon tannins in 3 different reaction vessels, add 80 mL of deionized water to each, adjust the pH to 10 with NaOH, add the intermediate product CS-Cl obtained above, and put the mixture at 45°C After heating and stirring for 6 h, it was filtered with suction, washed with dilute HCl, and then washed with deionized water until neutral. Three different products were dried in an oven at 50°C for 24 hours, then ground and sieved to obtain chitosan / persimmon tannin co...

Embodiment 3

[0042] Embodiment 3 A kind of chitosan / persimmon tannin composite material separates germanium from the arsenic solution containing high concentration

[0043] The existing pH=10 mixed material solution of 1ppmAs and 1ppmGe, the mixed material solution of 10ppmAs and 1ppmGe, the mixed material solution of 50ppmAs and 1ppmGe, the mixed material solution of 80ppmAs and 1ppmGe, the mixed material solution of 100ppmAs and 1ppmGe, respectively take 10mL of the above-mentioned Add 10 mg of the chitosan / persimmon tannin composite material prepared in Example 1 to the feed solution, shake it for 24 hours, filter it, and measure the concentrations of the stock solution and the filtrate. The result is as Figure 4 shown.

[0044] Depend on Figure 4 It can be seen that as the content of As(III) in the solution increases, the adsorption amount of Ge(IV) is hardly affected. Therefore, it can be concluded that the concentration ratio of As(III) and Ge(IV) in the solution Within 100:1, t...

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Abstract

The invention relates to a chitosan / persimmon tannin composite material and a preparation method and application thereof in germanium recovery. The preparation method adopts the technical scheme with the following steps of putting chitosan into a three-mouth flask, adding a proper amount of ethyl alcohol solution, dripping an epichlorohydrin solution, reacting at certain temperature, cooling, sucking and filtering, and washing to be at neutral state, so as to obtain an intermediate product; putting the persimmon tannin into the other reaction container, adding deionized water, adjusting the pH (potential of hydrogen) value to 9 to 10, adding the intermediate product, stirring for 6h at the temperature of 40 to 50 DEG C, cooling, sucking and filtering, and washing to be at neutral state, so as to obtain the chitosan / persimmon tannin composite material CS-Cl-PT. The prepared chitosan / persimmon tannin composite material has the advantages that the germanium can be selectively absorbed from a mixing solution of germanium and arsenic, the resource is saved, the environment-friendly and clean effects are realized, and the application value is wide.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite materials and extraction of scattered metals, and in particular relates to a chitosan / persimmon tannin composite material, a preparation method thereof and an application in germanium recovery. Background technique [0002] Germanium is a kind of scattered element. In my country, germanium is rich in resources and its storage capacity ranks first in the world. It has been widely used in aerospace, optical communication, infrared optics, electronic devices, solar cells, biomedicine and other fields. There are 11 kinds of germanium minerals have been found, mainly in Namibia germanium silicon, germanite, calcium germanium alum, hydroxygermanium plumberite, germanite and germanium magnetite, but germanium has no independent deposits in the earth's crust, mostly associated with colored minerals Among metal minerals, the content is low and the distribution is wide. At present, germaniu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62C22B41/00C02F101/20
CPCB01J20/24B01J2220/4825C02F1/286C02F2101/20C22B41/00Y02W10/37
Inventor 熊英龚利凤单炜军娄振宁
Owner LIAONING UNIVERSITY
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