A method for separating and recovering mixed heavy metals using calcium alginate membrane
A technology of calcium alginate and heavy metals, applied in the field of resources and environment, and functional materials, can solve the problems of serious heavy metal pollution, heavy metal pollution, and difficulty in separation and recovery of heavy metals. The method is simple, the removal efficiency and recovery efficiency are high, and the application prospect is good. Effect
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Embodiment 1
[0018] a) Weigh 0.5g of sodium alginate, weigh 1% urea by mass of sodium alginate, dissolve it in 50mL of deionized water under stirring to obtain an aqueous solution of sodium alginate, and obtain a casting solution after defoaming;
[0019] b) preparing a 0.5% calcium chloride aqueous solution as an ion cross-linking agent in a mass percentage of 0.5%;
[0020] c) Take 1 g of the casting solution obtained in step a) and pour it on a clean and flat glass plate, scrape it into a liquid film with a uniform thickness with a scraper rod with a thickness of 100 μm, and immediately soak the liquid film and the glass plate into step b) In the obtained ionic cross-linking agent, soak for 0.5 hour to obtain a calcium alginate film, and soak in an aqueous calcium chloride solution for use;
[0021] d) prepare an aqueous solution of lead ions and iron ions, the mass percentage of each heavy metal ion is 0.01%, and the pH value of the solution is adjusted to 3.0 with dilute nitric acid; ...
Embodiment 2
[0024] a) Weigh 2 g of sodium alginate, weigh polyethylene glycol with a mass percentage of sodium alginate of 150%, and dissolve it in 100 mL of deionized water under stirring to obtain an aqueous solution of sodium alginate, and obtain a casting solution after defoaming;
[0025] b) preparing an aqueous calcium nitrate solution with a mass percentage of 50% as an ion cross-linking agent;
[0026] c) Take 5 g of the casting solution obtained in step a) and pour it on a clean and flat glass plate, scrape it into a liquid film with a uniform thickness with a scraper rod with a thickness of 1000 μm, and immediately soak the liquid film and the glass plate into step b) In the obtained ionic cross-linking agent, soak for 24 hours to obtain a calcium alginate film, and soak in an aqueous calcium chloride solution for use;
[0027] d) prepare an aqueous solution of copper ions and cadmium ions, the mass percentage of each heavy metal ion is 10%, and the pH value of the solution is a...
Embodiment 3
[0030]a) Weigh 1 g of sodium alginate, weigh polyvinylpyrrolidone with a mass percentage of sodium alginate of 50%, and dissolve it in 80 mL of deionized water under stirring to obtain an aqueous solution of sodium alginate, and obtain a casting solution after defoaming;
[0031] b) preparing a 5% calcium dihydrogen phosphate aqueous solution as an ion cross-linking agent;
[0032] c) Take 2g of the casting solution obtained in step a) and pour it on a clean and flat glass plate, scrape it into a liquid film with a uniform thickness with a scraper rod with a thickness of 500 μm, and immediately soak the liquid film and the glass plate into step b) In the obtained ionic cross-linking agent, soak for 8 hours to obtain a calcium alginate film, and soak in an aqueous calcium chloride solution for use;
[0033] d) preparing an aqueous solution of lead ions, copper ions and cadmium ions, the mass percentage of each heavy metal ion is 1%, and the pH value of the solution is adjusted ...
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