Rhodamine B-grafted chitosan adsorbent and preparation and application thereof
A chitosan and adsorbent technology, which is applied in the field of adsorption material preparation technology, can solve the problems of endangering human life safety, high toxicity, and not easy to degrade, and achieves improved adsorption capacity and selectivity, good reproducibility, and enrichment. Multiplier effect
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[0023] Preparation of rhodamine B grafted chitosan adsorbent
[0024] (1) Synthesis of rhodamine B hydrazide: first dissolve 2.5mmol rhodamine B in 30mL ethanol, add 3mL (excess) hydrazine hydrate (85%, v / v) dropwise at room temperature, and stir vigorously at the same time; heat to reflux 2h, until the dark purple color becomes orange and transparent, then cool, and remove the solvent under reduced pressure; then add 50mL of 1M HCl to dissolve the solid, then slowly add 70mL of 1M NaOH, and stir until the pH reaches 9~10; the resulting precipitate is washed 3 times with water and dried , and finally get a pink solid;
[0025] (2) Rhodamine hydrazide grafted to chitosan: Dissolve 1 g of rhodamine B hydrazide synthesized in step (1) in 50 mL of methanol, then add 2 mL of glyoxal and 2 g of chitosan in turn, stir, and 2 The reaction was refluxed in the environment for 8 hours, and after cooling to room temperature, the obtained solid was washed three times with methanol and wat...
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