Immobilized tannin for enriching rare scattered metal, preparation method and method for enriching rare scattered metal by using the immobilized tannin
A sparse metal enrichment technology, which is applied in the field of its preparation, enrichment of immobilized tannin of scattered metal, and enrichment of tannin of scattered metal, can solve the problems of increasing residual amount, increasing pollution load, increasing consumption, etc.
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Embodiment 1
[0072] Embodiment 1 prepares chitosan-acetic acid solution, tannin-acetic acid solution
[0073] 1. Preparation of chitosan-acetic acid solution
[0074] Add chitosan to the acetic acid solution, dissolve evenly, prepare chitosan-acetic acid solution, and set aside, wherein the mass ratio of chitosan to acetic acid solution is 1:(20-40) (preferably 1:30) ; The mass percent concentration of the acetic acid solution is usually 1-3% (preferably 2%);
[0075] Accurately weighed chitosan (3g) is dissolved in the acetic acid solution of 2% in 90g mass percentage concentration, dissolves evenly, is mixed with chitosan-acetic acid solution (93g), for subsequent use, wherein chitosan and acetic acid solution mass Ratio 1:30;
[0076] 2. Prepare tannin-acetic acid solution
[0077] Add emblica tannin into the acetic acid solution, dissolve evenly, and prepare a tannin-acetic acid solution for later use, wherein the mass ratio of emblica tannin to the acetic acid solution is 1:2-20 (pre...
Embodiment 2
[0080] Example 2 Preparation of immobilized emblica tannin (PEIT)
[0081] 1. Cross-linking reaction
[0082] Under stirring condition, the tannin-acetic acid solution (22g) that embodiment 1 prepares is joined in the chitosan-acetic acid solution (93g), after mixing, add mass percent concentration and be 5% (usually 0.2-5.0%) Glutaraldehyde solution (10g), wherein, the mass ratio of emblica tannin and chitosan is 1:1.5 (usually 1:(0.5-2.5), preferably 1:(1-2), more preferably 1:1.5); the mass ratio of glutaraldehyde to emblica tannin is 1:4 (usually 1:2-16, preferably 1:2-8, more preferably 1:2-4);
[0083] In the specific embodiment of the present invention, the mass percent concentration of the glutaraldehyde solution is 5% as an example, and other concentrations such as 0.2-5.0% are applicable to the present invention.
[0084] Then heat until the temperature is maintained at 55°C (usually 0-90°C, preferably 20-80°C), and adjust and control the pH value during the reacti...
Embodiment 2A
[0107] Embodiment 2A prepares immobilized emblical tannin (PEIT)
[0108] 1. Cross-linking reaction
[0109] Under stirring condition, the tannin-acetic acid solution (22g) that will prepare according to embodiment 1 method joins in the chitosan-acetic acid solution (62g), and wherein the ratio of the quality of emblica tannin and chitosan is 1: 1. After mixing, add 20g, 10g, 5g, 2.5g, 1.25g of glutaraldehyde solution with a mass percent concentration of 5% respectively, wherein the mass ratio of glutaraldehyde to emblical tannin is 1:2, 1:4, 1:8, 1:16, 1:32;
[0110] Then heat until the temperature is maintained at 55°C (usually 0-90°C, preferably 20-80°C), and adjust and control the pH value during the reaction with 0.1mol / L NaOH or / and 0.1mol / L HCl Be 4.0, carry out cross-linking reaction;
[0111] Wherein, tannin-acetic acid solution is prepared according to the method of Example 1, emblica tannin 2g, acetic acid solution 20g; chitosan-acetic acid solution is prepared a...
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