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Persimmon tannin-containing metal adsorbent and preparation method thereof

An adsorbent and metal technology, which is applied in the field of natural product preparation, can solve the problems of severe reaction conditions, dimethylamine harmful to the environment, and easy volatility, and achieve the effects of low extraction cost, abundant resources, and high production efficiency

Inactive Publication Date: 2012-08-01
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The persimmon tannin-containing metal adsorbent prepared by concentrated sulfuric acid solidification method and its modification method has selectivity, high-efficiency adsorption effect and easy elution for some noble metal ions, but its reaction conditions are severe (the reaction medium is concentrated sulfuric acid), and it is difficult for large The adsorption amount of some metal ions is not high enough. In addition, dimethylamine is harmful to the environment and is volatile, so the modification with dimethylamine is easy to cause harm to the environment.

Method used

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  • Persimmon tannin-containing metal adsorbent and preparation method thereof
  • Persimmon tannin-containing metal adsorbent and preparation method thereof
  • Persimmon tannin-containing metal adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Preparation Example

[0025] (1) Wash the raw persimmon fruit or persimmon skin containing persimmon tannins, crush or squeeze the juice, freeze-dry under vacuum at 40-200Mpa for 10-40h to obtain persimmon tannin-containing persimmon powder, or place it at -4°C Refrigerate, reserve;

[0026] (2) Take 30 g of freeze-dried persimmon powder, add 65 mL of 0.25 mol / L sodium hydroxide solution, and stir thoroughly;

[0027] (3) After adding 6mL of 37% (v / v) formaldehyde solution and fully stirring, the obtained solid granular adsorbent;

[0028] (4) Put the above-mentioned adsorbent in a water bath at 80° C. for 12 hours to make the reaction fully;

[0029] (5) Wash the fully reacted adsorbent once with deionized water, then wash once with 100mL 0.05mol / L dilute nitric acid solution, and finally wash with deionized water repeatedly until neutral and remove soluble substances therein;

[0030] (6) fully drying the obtained adsorbent after washing at 60-70° C. so t...

Embodiment 2

[0032] Embodiment 2 preparation embodiment

[0033] (1) Wash the raw persimmon fruit or persimmon skin containing persimmon tannins, crush or squeeze the juice, freeze-dry under vacuum at 40-200Mpa for 10-40h to obtain persimmon tannin-containing persimmon powder, or place it at -4°C Refrigerate, reserve;

[0034] (2) Put 600 g of freeze-dried persimmon powder into 1300 mL of 0.25 mol / L sodium hydroxide solution, and stir thoroughly;

[0035] (3) After adding 120mL of 37% (v / v) formaldehyde solution and fully stirring, a solid granular adsorbent can be obtained;

[0036] (4) Put the above-mentioned adsorbent in a water bath at 80° C. for 24 hours to make the reaction fully;

[0037] (5) Wash the fully reacted adsorbent with deionized water once, then wash once with 2000mL 0.05mol / L dilute nitric acid solution, and finally wash with deionized water repeatedly until neutral and remove soluble substances;

[0038] (6) drying the adsorbent after washing at 60-70°C so that its w...

Embodiment 3

[0040] Embodiment 3 preparation embodiment

[0041] (1) Wash the raw persimmon fruit or persimmon skin containing persimmon tannins, crush or squeeze the juice, freeze-dry under vacuum at 40-200Mpa for 10-40h to obtain persimmon tannin-containing persimmon powder, or place it at -4°C Refrigerate, reserve;

[0042] (2) Add 40g of persimmon powder into 80mL of 0.25mol / L sodium hydroxide solution, and stir well;

[0043] (3) Add 4mL of 37% (v / v) formaldehyde solution and stir well;

[0044] (4) Put the above mixture into a water bath at 80°C for 12 hours to make it fully react;

[0045] (5) Wash the fully reacted product once with deionized water, then wash once with 100mL of 0.05mol / L dilute nitric acid, and finally wash it with deionized water repeatedly to neutrality and remove soluble substances;

[0046] (6) Put the washed product into a 60-70°C oven to fully dry it so that its water content is less than 5%; and

[0047] (7) Pulverize the dried product and pass through a...

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Abstract

The invention belongs to the technical field of natural product preparation and especially relates to a persimmon tannin-containing metal adsorbent and a preparation method thereof. The persimmon tannin-containing metal adsorbent can be widely used for adsorbing and recovering metal ions of a secondary resource and has a low cost, good effects and good environmental benefits. The preparation method of the persimmon tannin-containing metal adsorbent comprises the following steps of 1, cleaning up persimmon tannin-containing diospyros kaki thumb. fruits, crushing them or squeezing them, and carrying out vacuum freeze drying to obtain diospyros kaki thumb. powder, 2, putting the diospyros kaki thumb. powder obtained by the step 1 into a dilute caustic soda solution, fully stirring, adding a formaldehyde solution into the mixed solution, and fully stirring to obtain a crude metal adsorbent, 3, carrying out water-bath treatment on the crude metal adsorbent so that the crude metal adsorbent fully reacts, 4, washing the reacted metal adsorbent by deionized water, washing the washed metal adsorbent by a dilute nitric acid solution, and then washing it by deionized water repeatedly until the metal adsorbent is neutral and soluble matters are removed, and 5, putting the washed metal adsorbent into an oven, drying, crushing and sieving it by a sieve of 100 meshes to obtain the persimmon tannin-containing metal adsorbent. The invention also discloses the preparation method of the persimmon tannin-containing metal adsorbent.

Description

technical field [0001] The invention belongs to the technical field of natural product preparation, and in particular relates to a method for preparing a metal adsorbent containing persimmon tannin and a metal adsorbent prepared by the method. The metal adsorbent can adsorb or return precious and heavy metals in secondary resources Metal ion. Background technique [0002] Heavy metal ions enter and accumulate in organisms through air, water, food and other media, and usually cause genetic and reproductive toxicity, which seriously affects human health and damages the ecological environment. Therefore, timely treatment of industrial and domestic water polluted by heavy metals is very necessary. At the same time, with economic and social development, the demand for precious metals is increasing, but the reserves of precious metal minerals are limited. In addition, secondary resources such as electronic waste containing precious metals are increasing, and their precious metal...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30B01D15/08C22B7/00C22B11/00
CPCY02P10/20
Inventor 罗正荣樊在军谢枫张青林郭大勇
Owner HUAZHONG AGRI UNIV
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