Journal
CARBOHYDRATE POLYMERS
Volume 267, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2021.118151
Keywords
Adsorption; FFC-NMR relaxometry; Lead; Nanosponges; Remediation; Speciation
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Different CyCaNSs were characterized and used as sorbents for removing Pb2+ ions from aqueous solutions. The adsorption abilities and affinities were investigated, and post-modified CyCaNSs show promise for designing environmental remediation devices. Recycling and reuse experiments on the most efficient adsorbents were also performed.
Different cyclodextrin-calixarene nanosponges (CyCaNSs) have been characterized by means of FFC-NMR relaxometry, and used as sorbents to remove Pb2+ ions from aqueous solutions. Considering that the removal treatments may involve polluted waters with different characteristics, the adsorption experiments were performed on solutions without and with the addition of background salts, under different operational conditions. The adsorption abilities and affinities of the nanosponges towards Pb2+ ions were investigated by measuring the metal ion concentration by means of Inductively Coupled Plasma Emission Spectroscopy (ICP-OES) and Differential Pulse Anodic Stripping Voltammetry (DP-ASV). The acid-base properties of nanosponges and of metal ion as well as their interactions with the other interacting components of the systems have been considered in the evaluation of adsorption mechanism. Recycling and reuse experiments on the most efficient adsorbents were also performed. On the grounds of the results obtained, post-modified CyCaNSs appear promising materials for designing environmental remediation devices.
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