Method for absorbing hexavalent chromium in wastewater by using strong alkali anion exchange resin containing glyoxaline structure
A technology of hexavalent chromium ion and exchange resin, which is applied in the field of strong base anion exchange resin to adsorb hexavalent chromium ion in wastewater to achieve the effect of easy regeneration
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Embodiment 1
[0033] Example 1 Take 5 g of chloromethylated polystyrene resin (1% divinylbenzene, 3.5 mmolCl / g) in a three-necked flask, add 30 mL of N, N-dimethylformamide, stir at room temperature for 2 h, add 1.65 g N-methylimidazole was reacted at 80°C for 36h, and the synthetic resin was filtered and washed with ethanol. Stir the washed resin in 30 mL of ethanol at 65°C for 24 hours, filter the resin and dry it in vacuum to obtain a resin containing an amphoteric imidazole chloride salt structure, that is, a chlorine-type strong base anion exchange resin containing an imidazole structure.
[0034] Shake 1 g of chlorine-type strong base anion exchange resin containing imidazole structure with 20 mL, 2 mol / L sodium sulfate solution for 1 h and filter the resin. This step is repeated 3 times, and ion chromatography detects that there are no chloride ions in the filtrate for the third time. Then wash the filtered resin with a large amount of deionized water to remove excess sulfate ions to...
Embodiment 2
[0036]Example 2 Take 0.01 g of a chlorine-type strong base anion exchange resin containing an imidazole structure and place it in a container, add 15 mL of waste water containing 50 mg / L of hexavalent chromium ions, shake for 60 minutes to reach equilibrium, and detect the concentration of remaining hexavalent chromium ions in the waste water It is 0.34mg / L, reaching the wastewater discharge standard stipulated in China.
Embodiment 3
[0037] Example 3 Take 0.01 g of a chlorine-type strong base anion exchange resin containing an imidazole structure and place it in a container, add 15 mL of waste water containing 60 mg / L of hexavalent chromium ions, shake for 60 minutes to reach equilibrium, and detect the concentration of remaining hexavalent chromium ions in the waste water lower than 0.47mg / L.
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