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标题：Selective removal of lead ions from aqueous solutions using SiO 2–MoO 3: Isotherm, kinetics and thermodynamic studies
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作者：Jasmina Sulejmanović ; Neira Kovač ; Mustafa Memić 等
期刊名称：Case Studies in Chemical and Environmental Engineering
印刷版ISSN：2666-0164
出版年度：2021
卷号：3
页码：1-4
DOI：10.1016/j.cscee.2021.100083
语种：English
出版社：Elsevier
摘要：AbstractThis study reveals novel data on adsorptive removal of Pb(II) from single metal solution, as well as from multi-metal solution containing Cd(II), Co(II), Cr(III), Cu(II), Fe(III), Mn(II), Ni(II) and Zn(II) ions along with Pb(II) using inorganic SiO2–MoO3sorbent in a batch system. The results of multi-metal solution system were strongly pH-depended and due to occurred precipitation of Fe(III) in the form of hydroxide. The parameters affecting the sorption efficiency (contact time, sorbent dosage and initial analyte concentration) were evaluated for single solution system. The optimal conditions for SiO2–MoO3sorbent indicated high affinity toward Pb(II) ions within following process parameters; pH value 3, sorbent dosage 50 mg and contact time 60 min for maximum Pb2+concentration of 100 mg/L. The adsorption data for Pb(II) utilizing SiO2–MoO3best fit to pseudo-second-order kinetic model (R2 = 0.9998) and Langmuir isotherm model (R2 = 0.9320) with an adsorption capacity of 222.20 mg/g and Reff>95%. According to thermodynamic study, the adsorption process is feasible, spontaneous and exothermic (ΔG = −18.6 kJ/mol, ΔH = −7.5 kJ/mol and ΔS = 37.32 J/mol K). The results of present study demonstrated that SiO2–MoO3material as a renewable sorbent for Pb(II) removal.
关键词：KeywordsenEnvironmental pollutionAdsorptionPb(II)Renewable sorbentThermodynamicSilica and Wastewater treatment.