Preparation of functional chitosan magnetic microspheres and its adsorption for Cr3 + and Ni2 +
With tetraethyl orthosilicate modified Fe3 O4 and the 4-chlorophenyl isocyanate modified chitosan as raw materials,hexamethylene diisocyanate as connection agent,the functional chitosan magnetic microspheres are prepared.The obtained magnetic microspheres are characterized by means of SEM and FTIR.Its adsorption for Cr3 + and Ni2+ is investigated.The results show that the obtained magnetic microspheres have good dispersion performance and possess the average particle size about 520 nm.Its adsorption for Cr3+ or Ni2+ can reach equilibrium within 60 min,when the adsorbent dosage is 0.2 g,the initial concentration of Cr3+ is 2.5 mmol/L,pH =3.0 and the adsorption capacity is 191.1 mg/g.At the same time,when the initial concentration of Ni2+ is 0.1 mmol/L,pH =5.0,the adsorption capacity is 4.725 mg/g,the obtained adsorption isothermal data are accorded with Langmuir and Freundlich models.
modified chitosanFe3O4-chitosan magnetic microspheresadsorptionCr3 +Ni2+
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万方数据
维普
