Dry-column Vacuum Chromatographic Removal of Hg2+ from Wastewater Based on an Acridino-crown Ether-modified Spherical Silica Gel Adsorbent
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Published:2023-05-23
Issue:2
Volume:67
Page:205-212
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ISSN:1587-3765
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Container-title:Periodica Polytechnica Chemical Engineering
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language:
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Short-container-title:Period. Polytech. Chem. Eng.
Author:
Vezse Panna,
Kalóczkai János Attila,
Ster Dániel,
Bezúr László,
Golcs ÁdámORCID,
Huszthy PéterORCID,
Tóth Tünde
Abstract
Dry-column vacuum chromatographic technique is introduced for remediation of wastewater for the first time. A previously prepared chemically modified silica gel containing covalently immobilized Hg2+-selective acridino-crown ether selector molecules was used as an adsorbent. Removal of Hg2+ from highly contaminated river water was carried out to study practical applicability. Adsorption capacity, preconcentration factor, pH-sensitivity and selectivity in separation were determined. The adsorbent proved to be outstanding in selectivity, only Ag+ and Cu2+ interfered among 29 cations, was inert toward organic contaminants, exhibited regenerability and pH-independency between 3.0 ≤ pH ≤ 7.0. The proposed method showed a moderate efficiency in both adsorption (32 mg Hg2+ / 1 g adsorbent) and preconcentration (preconcentration factor of 100). A maximum 10 L of wastewater / 1 g adsorbent ratio is recommended as an upper limit for applicability. The described method showed a unique robustness and simplicity compared to conventional ion-chromatographic methods and an improved selectivity over physical interaction- or simple functional group-based adsorptions.
Publisher
Periodica Polytechnica Budapest University of Technology and Economics
Subject
General Chemical Engineering