Method for removing and recycling hexavalent chromium ions by using chitosan-iron complex
A technology of hexavalent chromium ions and iron complexes, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of cumbersome preparation, new material removal efficiency needs to be improved, and inconvenient operation. Simplicity, improved adsorption performance, and low cost
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Embodiment 1
[0030] Prepare 0.05mol / L FeCl 3 Solution 50mL (0.0025mol), slowly add chitosan monomer 2.67g (molecular weight is 1,000,000, deacetylation degree is 91%), make chitosan monomer and Fe 3+ The molar ratio of the chitosan-iron complex is 6:1, keep stirring for 2 hours to make the two fully react, then slowly add 50mL of ethanol and stir slowly at the same time, after the chitosan-iron complex precipitation is gradually formed, centrifuge and wash with absolute ethanol to unreacted Fe 3+ , then add 25% glutaraldehyde 5mL, cross-linking reaction for 2h, and finally use absolute ethanol to wash glutaraldehyde again, centrifuge, dry at 80°C, grind finely, and prepare reduction-adsorption bifunctional chitosan-iron Complexes.
Embodiment 2
[0032] Prepare 0.1mol / L FeCl 3 Solution 50mL (0.005mol), slowly add chitosan monomer 2.67g (molecular weight is 1,000,000, deacetylation degree is 91%), make chitosan monomer and Fe 3+ The molar ratio of the chitosan-iron complex is 3:1, keep stirring for 2 hours to make the two fully react, then slowly add 50mL of ethanol and stir slowly at the same time, after the chitosan-iron complex precipitation is gradually formed, centrifuge and wash with absolute ethanol to unreacted Fe 3+ , then add 25% glutaraldehyde 5mL, cross-linking reaction for 2h, finally use absolute ethanol to wash the glutaraldehyde again, centrifuge, dry at 80°C, and grind finely to obtain the reduction-adsorption bifunctional chitosan-iron complex Thing, structure is as shown in formula (I):
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