Abstract
Nitrite is one of the main pollutants in the water worldwide. In this study, we have applied the reverse suspension crosslinking methodology based on chitosan (CS) and Fe3O4 (FeO) to synthesize the novel magnetic nanomaterial of chitosan (CS-FeO). The physical and chemical properties of CS-FeO were further characterized by scanning electron microscopy, particle size distribution, thermogravimetry, fluxgate magnetometer, Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, and energy dispersive spectroscopy. Results revealed that CS-FeO showed high thermal stability in the temperature ranging from 50 to 200°C. CS-FeO showed high crystallinity and magnetism and was easily and quickly separated from aqueous solution in the presence of an external magnetic field. The molecular structure of CS-FeO showed that the core-shell structure of CS-FeO was established with FeO as the core and CS as the shell. Furthermore, the adsorption rate of nitrite by CS-FeO reached 65.83 ± 0.76 % under optimal conditions. Moreover, CS-FeO showed high regeneration capability with Na2SO4 used as the eluent. Our study demonstrated evidently that CS-FeO can be potentially used to remove nitrite from drinking water sources and industrial wastewater, suggesting the promising future of the application of CS-derived magnetic nanomaterials in the areas of environmental protections.
Highlights
With the rapid development of industrialization and urbanization, large amounts of pollutants are released into the natural environments, resulting in environmental pollutions and degradations [1,2,3,4]
We have investigated the regeneration conditions of CS-FeO to explore the potential application of CS-FeO in the removal of nitrite from the water sources
Studies have shown that CS-FeO has been widely synthesized to carry out various biological functions
Summary
With the rapid development of industrialization and urbanization, large amounts of pollutants are released into the natural environments, resulting in environmental pollutions and degradations [1,2,3,4]. The increase of nitrite in the aquatic ecosystem has shown severe detrimental effects on the environment, leading to the acceleration of environmental eutrophication, the imbalance of species distribution in the ecosystem, the growth of a single species, the destruction of the system’s material cycle and energy flow, and the pollution and deterioration of the ecosystem [11, 12]. Due to the improper treatment of various industrial and domestic sewages, the incomplete abiotic and nitrification/denitrification processes in the soil have caused a significant increase in the concentration of nitrite in both surface water and groundwater systems such as rivers, lakes, and other major sources of drinking water in the world [13].
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