Adsorption Performance and Mechanism of Cr(VI)by Amino-Functionalized Chitosan Microspheres
CS/DETA gel spheres rich in hydroxyl and amino group were prepared using chitosan(CS)as substrate,sodium tripolyphosphate(TPP)as curing agent,glutaraldehyde(GLA)as cross-linking to improve its acid resistance,and diethylenetriamine(DETA)as modification,to adsorb Cr(VI)in water bodies.Infrared spectral characterization confirm the successful grafting of DETA;X-ray photoelectron spectroscopy characterization shows that Cr(VI)was adsorbed onto the surface of CS/DETA;Zeta potential characterization reveals the surface electronegativity of CS/DETA,which is more prone to adsorb Cr(VI)under acidic condition.The adsorption process was investigated by kinetics and thermodynamic models,and the results show that the adsorption process of CS/DETA on Cr(VI)is more consistent with the proposed first-order kinetic model and Langmuir isothermal adsorption model,and the maximum adsorption amount of Cr(VI)is 370.92 mg/g at 318.15 K and pH=2,and the reaction is a spontaneous heat absorption reaction.
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