Abstract
Due to its lethal effect on the human body and other creatures, Cr(VI) ions have attained widespread public attention, and an effective adsorbent for removing Cr(VI) ions is vital. Chitosan (CS)/cellulose nanocrystals grafted with carbon dots (CNCD) composite hydrogel with strong sorption ability and sensitive detection ability for Cr(VI) was formed. The cellulose nanocrystals (CN) offered a natural skeleton for assembling 3D porous structures, and then improved the sorption ability for Cr(VI); moreover, carbon dots (CD) acted as a fluorescent probe for Cr(VI) and provided Cr(VI) adsorption sites. With a maximum adsorption capacity of 217.8 mg/g, the CS/CNCD composite hydrogel exhibited efficient adsorption properties. Meanwhile, with a detection limit of 0.04 μg/L, this hydrogel was used for selective and quantitative detection of Cr(VI). The determination of Cr(VI) was based on the inner filter effect (IFE) and static quenching. This hydrogel retained its effective adsorption ability even after four repeated regenerations. Furthermore, the economic feasibility of the CS/CNCD composite hydrogel over activated carbon was confirmed using cost analysis. This study provided one new method for producing low-cost adsorbents with effective sorption and sensitive detection for Cr(VI).
Highlights
Due to rapid industrial development, water contamination by heavy metals has become more and more serious [1]
We propose introducing cellulose nanocrystals (CN)
cellulose nanocrystals grafted with carbon dots (CNCD) was first prepared by covalent bonding between CN and carbon dots (CD)
Summary
Due to rapid industrial development, water contamination by heavy metals has become more and more serious [1]. CS has received widespread attention as an adsorbent for heavy metal ions due to its low cost and great adsorption potentials [3]. The adsorption thermodynamics, kinetics, and adsorption mechanism of a composite chitosan-glucose hydrogel for sorption of Co2+ ion were discussed, and the adsorption capacity of 202 mg/g for Co2+ was demonstrated [6]. Researchers have made great efforts, improving the adsorption capacity for heavy metals by the chitosan-based material is still a challenge. A general solution would be to introduce nanoparticles with excellent properties in order to increase adsorption capacity [7] In this regard, we propose introducing cellulose nanocrystals (CN). CS/CN composite hydrogel has great potentiality in the development of novel adsorbents
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