Adsorption Difference of Pb2+by Different Modified Semi-carbon Fiber
Semi-carbon fiber(SCF)prepared from polypropylene hydrocarbon was chemically and biologi-cally modified,and then complexly modified with sodium alginate.Through experiments,the isothermal adsorp-tion and kinetic characteristics of different modified SCFs on Pb2+were investigated,and the effects of pH value,temperature and ionic strength on Pb2+adsorption were analyzed.The results showed that the adsorption isotherm of these test materials conformed to Langmuir and Freundlich models,and the maximum adsorption capacity(qm)was from 495.09 mmol/kg to 770.56 mmol/kg.The adsorption capacity of Pb2+by different modified SCFs increased by 1.8％～55.6％.The increase of pH value was conducive to the adsorption of Pb2+by various test materials.When the ion strength ranged from 0.01 mol/L to 0.5 mol/L,the adsorption capacity of various test materials increased first and then decreased,and reached the maximum at 0.1 mol/L.The thermodynamic parameters indicated that the adsorption of Pb2+was a spontaneous,endothermic and entropy-increasing process.
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