Study on Adsorption Properties of Xylan-Based Hydrogels for Cu2+
Using xylan as the raw material,acrylic acid,N-isopropylacrylamide as functional monomers,and N,N'-methylenebisacrylamide as a crosslinking agent,hydrogel adsorbents were prepared through graft polymerization under ultraviolet initiation with photoinitiator benzoin dimethyl ether.The structure of the hydrogel adsorbent was analyzed using Fourier-transform infrared spectroscopy(FTIR)and scanning electron microscopy(SEM).The effects of pH value,adsorbent dosage,initial mass concentration of metal ions,and adsorption time on the adsorption performance of Cu2+ were studied.The results show that the adsorption capacity of Cu2+ increases with the increase of the pH of the Cu2+ solution.When the Cu2+ concentration is 300 mg/L and the pH value is 5.0,the maximum adsorption capacity for Cu2+ is 290 mg/g,with an adsorption rate of 92%.The adsorption of Cu2+ by the hydrogel follows an ion exchange mechanism,and the adsorption behavior conforms to the pseudo-second-order kinetic model.
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