Kinetics and isotherms of lead ions removal from wastewater using modified corncob nanocomposite

[Display omitted] •Corncob, and silica/corncob nanocomposite were prepared for removal of lead ions.•The kinetics of the sorption reaction follows a pseudo-second-order model.•The reaction of the sorption could be fitted Langmuir isotherm.•Using a packed column for lead ions removal was effective.•T...

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Veröffentlicht in:Inorganic chemistry communications 2021-08, Vol.130, p.108742, Article 108742
Hauptverfasser: Kamal, Kholod H., Attia, M.S., Ammar, Nabila S., Abou-Taleb, Enas M.
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Sprache:eng
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Zusammenfassung:[Display omitted] •Corncob, and silica/corncob nanocomposite were prepared for removal of lead ions.•The kinetics of the sorption reaction follows a pseudo-second-order model.•The reaction of the sorption could be fitted Langmuir isotherm.•Using a packed column for lead ions removal was effective.•The sorbent's regeneration was promising. A promising new eco-friendly sorbent from agricultural waste (silica/corncob nanocomposite) was successfully prepared and used for the removal of lead ions from the solution. The characterization and identification of the synthesized sorbents were investigated using different techniques. A comparative adsorption study between two sorbents was estimated to identify the best efficient sorbent. The potential of the best sorbent to remove lead ions (Pb2+) from an aqueous solution was investigated in batch experiments, where several parameters such as contact time, pH, sorbent dose, and initial concentration of Pb2+ ions were investigated. For deep information, Kinetic and isotherm models were applied for sorption. Furthermore, the column study was evaluated from silica/corncob nanocomposite for removal of Pb2+ ions and the potential ability of the synthetic nanocomposite to be regenerated and reuse was also studied. It is remarkable that with 0.3 g of silica/corncob nanocomposite, up to 95% of Pb2+ could be removed at pH = 5.5 after 60 min which is higher than corncob (77%). From the kinetics and isotherms data, the harmony of data was fitted with the pseudo-second-order kinetic model and the Langmuir isotherm model. From a single column results, it seems that silica/corncob nanocomposite has proven to be a promising material and economical for the removal of heavy metals. Moreover, the results showed that the removal efficiency for Pb2+ was more than 90% for the first two cycles, and then slightly decreased to 85%. So, the silica/corncob nanocomposite can be reused for the removal of heavy metals from wastewater for at least 3 cycles.
ISSN:1387-7003
1879-0259
DOI:10.1016/j.inoche.2021.108742