期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2020
卷号：11
期号：1
页码：69-78
出版社：University of Mohammed Premier Oujda
摘要：A recoverable adsorbent of magnetized natural zeolite (zeolite-Fe3O4) has been prepared bytwo different techniques, named as co-precipitation and impregnation. The characters and theperformance of the zeolite-Fe3O4 adsorbents prepared by the two of different techniqueswere compared. The performance of the adsorbents was evaluated for Pb(II) removal. Inaddition, the influence of the Fe3O4 fraction (25.0% w/w, 33.3% w/w, 50.0% w/w) on theadsorption capacity and recoverability was also studied. The adsorptions of Pb(II) wasproceeded by batch experiment, where the operating parameters, including adsorbent mass,pH, and time were optimized. The adsorption kinetic and isotherm were also determined.The research results assign that zeolite-Fe3O4 prepared by co-precipitation has larger surfacearea, better Fe3O4 dispersion, higher recoverability, and considerably same adsorptioncapacity compared to that of by impregnation technique. Further, increasing Fe3O4 fractioncan raise the recoverability, but leads to a decrease in the adsorption capacity. The 33.3%w/wfraction of Fe3O4 in the adsorbents give compromisingly good adsorption capacity andrecoverability. The maximum of Pb(II) adsorption (95.15%) from 1 L solution with Pb(II)concentration of 150 mg L-1is reached by using 1.25 g of the adsorbent mass, pH 3, andcontact time 90 min. The adsorption kinetic best fits to pseudo second order with adsorptionrate = 3.752 g mg−1 min−1. The corresponding adsorption is well described by Langmuirisotherm model with adsorption capacity = 55.249 mg g−1. The adsorption energy is found tobe 31.548 kJ mol-1 suggesting that the adsorption follows the chemisorption phenomena.
