Removal of Pb2+ ions by raw corn silk (Zea mays L.) as a novel biosorbent

•The first application of a corn silk for lead removal from aqueous solutions.•The complexation and ion-exchange mechanism were involved in Pb2+ sorption on CS.•The sorption process is spontaneous and endothermic.•The adsorbent can be efficiently recovered by diluted nitrogen acid. There is no data...

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Bibliographic Details
Published in:Journal of the Taiwan Institute of Chemical Engineers 2016-01, Vol.58, p.407-416
Main Authors: Petrović, Marija, Šoštarić, Tatjana, Stojanović, Mirjana, Milojković, Jelena, Mihajlović, Marija, Stanojević, Marija, Stanković, Slavka
Format: Article
Language:English
Subjects:
Adsorption
Corn silk
Desorption
Mechanism
Pb2+ ions
Real effluent
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Summary:•The first application of a corn silk for lead removal from aqueous solutions.•The complexation and ion-exchange mechanism were involved in Pb2+ sorption on CS.•The sorption process is spontaneous and endothermic.•The adsorbent can be efficiently recovered by diluted nitrogen acid. There is no data about the corn silk usage as adsorbent for lead removal. In the present study, the corn silk (CS), without any modification, was investigated for adsorption of Pb2+ ions from aqueous solutions. The CS before and after Pb2+ adsorption was characterized by SEM-EDX and ATR-FTIR. The effect of pH, contact time, CS dosage and initial metal concentration on process of adsorption was investigated using batch adsorption procedure. The experimental data were fitted to Langmuir and Freundlich isotherm models, and the best data fit was achieved with the Freundlich isotherm model. Also the Langmuir and Freundlich isotherm models constants RL and n suggesting favorable adsorption of Pb2+ on the CS. Not only the ion-exchange mechanism was confirmed as an adsorption mechanism but the complexation process has also been verified according to results from ATR-FTIR spectra. Thermodynamic parameters were investigated too. Based on desorption study result, the adsorbent can be efficiently recovered. The present investigation qualified the corn silk (Zea mays L.) as a possible good adsorbent of lead from aqueous solutions. [Display omitted]
ISSN:1876-1070
1876-1089
DOI:10.1016/j.jtice.2015.06.025