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 extraction and utilization of natural products, achieves the effects of low cost and environmental protection, low equipment requirements, and a wide range of raw material sources
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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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