In this study, layered chitosan-based magnetic nickel ferrite NiFeO/chitosan (CS-LDO) composites were synthesized. The results show that under optimal conditions, 98 % of methylene blue (MB) and 92 % of xylenol orange (XO) can be simultaneously degraded within 120 min in the CS-LDO/persulfate (PS) system, and the removal rates of total organic carbon (TOC) and chemical oxygen demand (COD) can reach 67.32 % and 74.23 %, respectively. In addition, the strong magnetism of the material itself and multiple cycle experiments indicate that CS-LDO has good recyclability and reusability. The results of quenching experiments, electron paramagnetic resonance (EPR) and electrochemical characterization tests demonstrate that the degradation occurred via both radical and non-radical mechanisms. The differing types of reactive oxygen species (ROS) acting and the different electrostatic attraction between the materials and the two dyes lead to a significant difference in the removal effect of two dyes. The degradation mechanism is the redox reaction between Ni/Ni, Fe/Fe and the synergistic effect of Ni/Fe. Finally, the biotoxicity assessment demonstrated that both the degradation intermediates of mixed dyes and the material itself exhibited low biotoxicity.
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| http://dx.doi.org/10.1016/j.jes.2024.09.028 | DOI Listing |
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