To investigate the adsorption performance of modified chitosan on Ni(Ⅱ)in water,sodium tripolyphosphate was used as a crosslinking agent to ionically crosslink chitosan oxidized by acetic acid-hydrogen peroxide system,and modified chitosan adsorbent was prepared.The micro morpholo-gy,molecular structure,and phase of the material were characterized by scanning electron microsco-py,Fourier transform infrared spectroscopy,and X-ray diffraction;the factors affecting the adsorption performance of modified chitosan were explored through conditional experiments,and the adsorption process was thermodynamically analyzed.The results showed that the modified chitosan presented a nanosheet structure,and the crosslinking between P—O in sodium tripolyphosphate and—NH2 on chi-tosan was successfully achieved;under the conditions of sodium tripolyphosphate concentration of 10 g/L,hydrogen peroxide volume of 5 mL,and crosslinking temperature of 40 ℃,the prepared modi-fied chitosan exhibited good adsorption performance.When the pH was 7,the adsorption time was 120 min,and the dosage of sodium tripolyphosphate-modified chitosan was 50 mg,the removal rate of Ni(Ⅱ)reached 83.71％;the adsorption behavior of modified chitosan on Ni(Ⅱ)conformed to the Lang-muir isotherm adsorption model,and the adsorption process was a spontaneous endothermic process.
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维普
