Adsorption properties of humic acid modified wood chips for Cu2+
Using pine sawdust as raw material and humic acid as modifier,a modified sawdust adsorbent was prepared and its adsorption performance of Cu2+in wastewater was studied.The related substances were characterized by FT-IR,SEM,XPS,XRD,BET and Zeta.The results show that the modified sawdust contains hydroxyl and carboxyl groups,which has a better pore structure and is more conducive to the adsorption of Cu2+.The effects of adsorption temperature,pH of solution,initial mass concentration of Cu2+and adsorption time on the adsorption were investigated.The experimental results show that the best adsorption rate is 98.68％and the adsorption capacity is 157.89 mg/g when the adsorption time is 20 min,the temperature is 45℃ and the pH is 5.The adsorption process of Cu2+on the adsorbent accords with the pseudo-second-order kinetic model,and the Freundlich sorption isotherm model can well describe the adsorption behavior.The adsorption rate of Cu2+on modified sawdust adsorbent is 77.59％after four times regeneration.
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