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Open AccessArticle

Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water

1
Faculty of Civil Engineering, Institute of Environmental Engineering, Technical University of Kosice, Vysokoskolska 4, 042 00 Kosice, Slovakia
2
Department of Civil Engineering, University of Alicante, Carretera de s/n, 03690 Alicante, Spain
3
Joint Institute for Nuclear Research, Joliot-Curie Str. 6, 1419890 Dubna, Russia
4
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, 30 Reactorului Str., MG-6, Bucharest, 077125 Magurele, Romania
*
Author to whom correspondence should be addressed.
Materials 2020, 13(16), 3575; https://doi.org/10.3390/ma13163575
Received: 1 July 2020 / Revised: 5 August 2020 / Accepted: 10 August 2020 / Published: 13 August 2020
(This article belongs to the Special Issue Materials for Heavy Metals Removal from Waters)
Organic waste materials and semi-products containing cellulose are used as low-cost adsorbents that are able to compete with conventional sorbents. In addition, their capacity to bind heavy metal ions can be intensified by chemical treatments using mineral and organic acids, bases, oxidizing agents, and organic compounds. In this paper, we studied the biosorption capacity of natural and modified wooden sawdust of poplar, cherry, spruce, and hornbeam in order to remove heavy metals from acidic model solutions. The Fourier transform infrared spectroscopy (FTIR) spectra showed changes of the functional groups due to the alkaline modification of sawdust, which manifested in the considerably increased intensity of the hydroxyl peaks. The adsorption isotherm models clearly indicated that the adsorptive behavior of metal ions in treated sawdust satisfied not only the Langmuir model, but also the Freundlich model. The adsorption data obtained for studied sorbents were better fitted by the Langmuir isotherm model for both metals, except for spruce sawdust. Surface complexation and ion exchange are the major mechanisms involved in metal ion removal. We investigated the efficiency of the alkaline modified sawdust for metal removal under various initial concentrations of Cu(II) and Zn(II) from model solutions. The highest adsorption efficiency values (copper 94.3% at pH 6.8 and zinc 98.2% at pH 7.3) were obtained for poplar modified by KOH. For all types of sawdust, we found that the sorption efficiency of modified sorbents was higher in comparison to untreated sawdust. The value of the pH initially increased more in the case of modified sawdust (8.2 for zinc removal with spruce NaOH) and then slowly decreased (7.0 for Zn(II) with spruce NaOH). View Full-Text
Keywords: heavy metals; sorption; wooden sawdust; alkaline modification; Freundlich isotherm; Langmuir isotherm heavy metals; sorption; wooden sawdust; alkaline modification; Freundlich isotherm; Langmuir isotherm
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Kovacova, Z.; Demcak, S.; Balintova, M.; Pla, C.; Zinicovscaia, I. Influence of Wooden Sawdust Treatments on Cu(II) and Zn(II) Removal from Water. Materials 2020, 13, 3575.

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