Luminescent carbon dots-rooted polysaccharide crosslinked hydrogel adsorbent for sensitive determination and efficient removal of Cu2

• Published in: Food chemistry Vol. 447; p. 138977
• Main Authors: Li, Jingkun, Wang, Liying, Jiang, Guoyong, Wan, Yuqi, Wang, Jiahua, Li, Yan, Pi, Fuwei
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 30.07.2024
• Subjects: Carbon dot; Cellulose; Chitosan; Cu2+ removal; Fluorescent sensing; Heavy metal ions; Fluorescent sensing; Heavy metal ions; Carbon dot; Cu2+ removal; Chitosan; Cellulose
• ISSN: 0308-8146; 1873-7072
• DOI: 10.1016/j.foodchem.2024.138977

In this study, a novel luminescent carbon dot-rooted polysaccharide hydrogel (CDs@CCP hydrogel) was prepared by crosslinking cellulose, chitosan (CS), and polyvinyl alcohol (PVA) for simultaneous fluorescent sensing and adsorption of Cu2+. The crosslinking of these low-cost, polysaccharide polymers greatly enhance the mechanical strength of the composite hydrogel while making the polysaccharide-based adsorbent easy to reuse. This composite hydrogel exhibited an excellent adsorption capacity (124.7 mg∙g−1) for residual Cu2+ in water, as well as a sensitive and selective fluorescence response towards Cu2+ with a good linear relationship (R2 > 0.97) and a low detection limit (LOD) of 0.02 μM. The adsorption isotherms, adsorption kinetics, and thermodynamics studies were also conducted to investigate the adsorption mechanism. This composite hydrogel offers an efficient tool for simultaneous monitoring and treatment of Cu2+ from wastewater. [Display omitted] •Development of dedicated composite materials for detection and adsorption of Cu2+.•Low limit of detection achieved by fluorescence measurement for Cu2+ (0.02 μM).•Excellent adsorption capacity, i.e., 124.7 mg/g.•Possibility of recycling of this composite hydrogel for further use.