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Method for adsorbing and recovering heavy metals of lead and copper by persimmon tannin-containing metal adsorbent

A technology of adsorbent and persimmon tannin, which is applied in the field of natural product extraction and utilization, and achieves the effects of convenient industrial production, low equipment requirements and convenient operation.

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

AI Technical Summary

Problems solved by technology

At present, there are no literature reports on the use of persimmon tannins to adsorb lead and copper at home and abroad.

Method used

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  • Method for adsorbing and recovering heavy metals of lead and copper by persimmon tannin-containing metal adsorbent
  • Method for adsorbing and recovering heavy metals of lead and copper by persimmon tannin-containing metal adsorbent
  • Method for adsorbing and recovering heavy metals of lead and copper by persimmon tannin-containing metal adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation of embodiment 1 persimmon tannin metal adsorbent

[0036] (1) Clean the raw persimmon fruit containing persimmon tannin, crush or squeeze the juice, vacuum freeze-dry (40-200Mpa) to obtain persimmon tannin-containing persimmon powder, and set aside;

[0037] (2) Add the persimmon tannin-containing persimmon powder obtained in step (1) into a sodium hydroxide solution with a concentration of 0.125-0.25mol / L, fully stir and mix, then add v / v37% formaldehyde solution, fully stir evenly , obtaining a solid granular adsorbent crude product containing persimmon tannin;

[0038] (3) Put the crude product obtained in step (2) into a water bath, the temperature of the water bath is 60-90°C, and the water bath time is 8-24h, so that it can fully react; the crude product after the reaction is washed once with deionized water, and then washed with Wash once with dilute nitric acid with a concentration of 0.05-0.5mol / L, and finally wash repeatedly with deionized wat...

Embodiment 2

[0039] Example 2 Utilize persimmon tannin metal adsorbent to adsorb and reclaim lead in lead-containing mixed solution

[0040] (1) Weigh 15mg persimmon tannin adsorbent and pour it into a 100mL conical flask;

[0041] (2) the pH value of the lead-containing mixed solution that concentration is 20mg / L is adjusted to 5.0;

[0042] (3) Then measure 50mL of lead solution with a pH value of 5.0 and pour it into a triangular flask filled with adsorbent;

[0043] (4) Seal the triangular flask with a sealing film, put it into a shaker with a preset temperature of 30°C and a rotation speed of 200rpm, and oscillate and adsorb for 12h;

[0044] (5) filter, detect the lead ion concentration in the filtrate.

Embodiment 3

[0045] Embodiment 3 utilizes persimmon tannin metal adsorbent to adsorb and recover copper in copper-containing mixed solution

[0046] (1) Weigh 15mg persimmon tannin adsorbent and pour it into a 100mL conical flask;

[0047] (2) adjusting the pH value of the copper-containing mixed solution with a concentration of 10 mg / L to 5.5;

[0048] (3) Measure 50mL of the copper-containing mixed solution with a pH value of 5.5 and pour it into a triangular flask filled with adsorbent;

[0049] (4) Seal the triangular flask with a sealing film, put it into a shaker with a preset temperature of 30°C and a rotation speed of 200rpm, and oscillate and adsorb for 12h;

[0050] (5) filter and detect the copper ion concentration in the filtrate.

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Abstract

The invention belongs to the technical field of natural product preparation and especially relates to a method for adsorbing and recovering heavy metals of lead and copper by a persimmon tannin-containing metal adsorbent. The method can be widely used for adsorbing and removing lead and copper ions in waste water and has the advantages of low cost, large adsorption capacity, good environmental benefits and convenient operation. The method is characterized by comprising the following steps of 1, respectively adding a persimmon tannin-containing metal adsorbent and a lead or copper-containing mixed solution having a pH value of 4 to 6 into a reaction vessel according to a ratio of persimmon tannin-containing metal adsorbent mass (by mg) to lead or copper-containing mixed solution volume (by mL) of 1: (3 to 5), wherein the volume of the used lead or copper-containing mixed solution is less than or equal to half of the volume of the reaction vessel, 2, putting the reaction vessel into a shaking table, 3, carrying out shaking adsorption at a shaking-table rotation rate of 100 to 200rpm at a temperature of 10 to 50 DEG C for 12 to 24h, and 4, carrying out filtration so that the lead or copper ions can be reduced into metals and retained in the persimmon tannin-containing metal adsorbent. The method also can be used for adsorbing or recovering lead and copper in waste water by a chromatographic column.

Description

technical field [0001] The invention belongs to the technical field of extraction and utilization of natural products, and in particular relates to a method for absorbing and recovering heavy metal lead and copper by using persimmon tannin metal adsorbent, which can absorb and recover lead and copper in secondary resources. Background technique [0002] Heavy metal ions enter and accumulate in organisms through air, water, food and other media, seriously affecting human health and destroying the ecological environment. Generally, after heavy metals enter the human body, they will bind to some enzymes in the human body, inhibit the synthesis of necessary proteins in the human body, and affect the normal physiological activities of the human body; or inhibit the activity of enzymes, affecting the ion regulation in the human body; change the structure of proteins, so that Protein coagulation; some can also affect the nervous system, inhibiting and interfering with nervous syste...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30B01D15/08C02F1/28C22B3/24C02F101/20
CPCY02P10/20
Inventor 罗正荣谢枫张青林郭大勇
Owner HUAZHONG AGRICULTURAL UNIVERSITY
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