Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 162, Issue -, Pages 1839-1848Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2020.07.232
Keywords
Chitosan; Phenothiazine; Mercury sensing; Eco-design; Solid state materials; Visual detection
Funding
- Bilateral Romanian-Chinese Project [PN-III-P3-3.1-PM-RO-CN-2018-0098, 12/2018]
- European Union's Horizon 2020 -Research and Innovation Framework Programme [667387]
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The aim of the paper was to investigate the ability of an eco-friendly luminescent xerogel prepared by chitosan crosslinking with a phenothiazine luminogen to detect and remove heavy metals. Its ability to give a divergent morphological and optical response towards fifteen environmental relevant metals was investigated by naked eye and UV lamp, fluorescence spectroscopy and scanning electron microscopy. A distinct response was noted for mercury, consisting in the transformation of the xerogel into a rubber-like material accompanied by the red shifting of the color of emitted light from yellow-green to greenish-yellow domain. The particularities of themetals anchoring into the xerogel were analyzed by FTIR spectroscopy and X-ray diffraction. Themorphological changes and the metal uptake were analyzed by SEM-EDAX, swelling and gravimetric methods. It was concluded that mercury has a superior affinity towards this heteroatoms rich system, leading to a secondary crosslinking. This directed a great absorption capacity of 1673 mg/g and a specific morphological response for mercury ion concentrations up to 0.001 ppm. (C) 2020 Published by Elsevier B.V.
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