Preparation method of magnetic chromium ion chelating agent as well as obtained product and application
A technology of chromium ions and chelating agents, applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc., can solve the problems of little synthesis significance and a large amount of waste solvents, and achieve simple and easy separation operations Easy operation, convenient adsorption operation, and simple synthesis process
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Embodiment 1
[0033] 1. Disperse 1 g of ferric oxide microspheres with a particle size of 100 nm in 100 mL of deionized water, add 0.5 g of ascorbic acid, and heat to reflux for 3 h. After the reaction, the product was separated with a strong magnet, washed three times with 20 mL of deionized water, and dried in vacuum to obtain ascorbic acid-modified Fe 3 o 4 @AA microspheres.
[0034] 2. Add 6.3 g of melamine, 8.1 g of formaldehyde solution (37%), and 32.1 g of deionized water into a 250 mL beaker, and adjust the pH to 10 with 0.1 M NaOH. Place the beaker in a water bath and raise the temperature to 70 o C. Stir the reaction until a clear and transparent solution is obtained, which is the melamine formaldehyde prepolymer solution.
[0035] 1 g of Fe prepared above 3 o 4@AA microspheres were uniformly dispersed in 200 mL of deionized water, 5 g of the prepared melamine-formaldehyde prepolymer solution was added, the pH was adjusted to 2, and the reaction was carried out at room temper...
Embodiment 2
[0038] 1. Evenly disperse 2 g of ferric oxide microspheres with a particle size of 200 nm in 100 mL of deionized water, add 2 g of ascorbic acid, and heat to reflux for 3 h. After the reaction, the product was separated with a strong magnet, washed three times with 20 mL of deionized water, and dried in vacuum to obtain ascorbic acid-modified Fe 3 o 4 @AA.
[0039] 2. Add 6.3 g of melamine, 8.1 g of formaldehyde solution (37%), and 32.1 g of deionized water into a 250 mL beaker, and adjust the pH to 10 with 0.1 M NaOH. Place the beaker in a water bath and raise the temperature to 70 o C. Stir the reaction until a clear and transparent solution is obtained, that is, a melamine formaldehyde prepolymer solution.
[0040] 1 g of Fe prepared above 3 o 4 @AA microspheres were evenly dispersed in 200 mL of deionized water, 6 g of the prepared melamine-formaldehyde prepolymer solution was added, the pH was adjusted to 2, and the reaction was carried out at room temperature for 3 ...
Embodiment 3
[0043] 1. Disperse 1 g of ferric oxide microspheres with a particle size of 10 nm in 100 mL of deionized water, add 1 g of ascorbic acid, and heat to reflux for 3 h. After the reaction, the product was separated with a strong magnet, washed three times with 20 mL of deionized water, and dried in vacuum to obtain ascorbic acid-modified Fe 3 o 4 @AA microspheres.
[0044] 2. Add 6.3 g of melamine, 8.1 g of formaldehyde solution (37%), and 32.1 g of deionized water into a 250 mL beaker, and adjust the pH to 10 with 0.1 M NaOH. Place the beaker in a water bath and raise the temperature to 70 o C. Stir the reaction until a clear and transparent solution is obtained, which is the melamine formaldehyde prepolymer solution.
[0045] 1 g of Fe prepared above 3 o 4 @AA microspheres were evenly dispersed in 200 mL of deionized water, 10 g of the prepared melamine-formaldehyde prepolymer solution was added, the pH was adjusted to 2, and the reaction was carried out at room temperatur...
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