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

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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
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Example Embodiment

[0035] Example 1 Preparation of persimmon tannin metal adsorbent

[0036] (1) Wash the raw persimmon fruit containing persimmon tannin first, crush or squeeze it, vacuum freeze-dry (40-200Mpa), and obtain persimmon powder containing persimmon tannin for use;

[0037] (2) Add the persimmon tannin-containing persimmon powder obtained in step (1) to the sodium hydroxide solution with a concentration of 0.125-0.25 mol / L, stir and mix thoroughly, and then add the v / v 37% formaldehyde solution, and stir well To obtain a crude solid granular adsorbent 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℃, and the time of the water bath is 8-24h to make it fully react; the crude product after the reaction is washed once with deionized water, and then used Wash once with dilute nitric acid with a concentration of 0.05-0.5 mol / L, and finally wash repeatedly with deionized water to neutrality ...

Example Embodiment

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

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

[0041] (2) Adjust the pH value of the lead-containing mixed solution with a concentration of 20 mg / L to 5.0;

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

[0043] (4) Seal the triangular flask with a sealing film, put it into a shaker with a pre-set temperature of 30°C and a rotation speed of 200 rpm, and shake and absorb for 12 hours;

[0044] (5) Filter and detect the lead ion concentration in the filtrate.

Example Embodiment

[0045] Example 3 Using persimmon tannin metal adsorbent to adsorb and recover copper in a copper-containing mixed solution

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

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

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

[0049] (4) Seal the triangular flask with a sealing film, put it into a shaker with a pre-set temperature of 30°C and a rotation speed of 200 rpm, and shake and absorb for 12 hours;

[0050] (5) Filter and detect the concentration of copper ions 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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