Abstract
In this study, a novel magnetic cassava stalk composite (M-EMCS) was prepared through modification with ethylenediamine tetraacetic anhydride (EDTAD) and loading of Fe3O4. The surface morphology, molecular structure, and magnetic characteristics of the composite were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), vibrating-sample magnetometer (VSM), and X-ray diffraction (XRD). It was shown that EDTAD and Fe3O4 were successfully modified and loaded in cassava straw (CS), respectively. The capacity of M-EMCS to absorb heavy metals under different influencing factors was tested by atomic absorption spectroscopy. The adsorption processes of both Pb2+ and Zn2+ were suitably described by second-order kinetic models and Langmuir models, indicating monolayer chemisorption. M-EMCS had high adsorption rates and adsorption capacities for these two metal ions. The adsorption of Pb2+ and Zn2+ reached a plateau after 10 min, and the adsorption capacity of Pb2+ (163.93 mg/g) was higher than that of Zn2+ (84.74 mg/g). Thermodynamic analysis showed that the adsorption of two metals by M-EMCS was spontaneous, endothermic, and irreversible. XPS analysis showed that M-EMCS mainly removes Pb2+ and Zn2+ through ion exchange, chelation, and redox.
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This work was supported by the National Natural Science Foundation of China (No. 21267005) and Key Laboratory of Ecology Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, China (Grant Number ERESEP2017Z05).
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CK contributed to the conception and Methodology of the study. QL performed the data analyses and was a major contributor in writing the manuscript. HY performed the experiment. DH contributed significantly to the analysis and manuscript preparation. WM and MM helped perform the analysis with constructive discussions. SH performed project administration and supervision. All the authors read and approved the final manuscript.
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Kang, C., Li, Q., Yi, H. et al. EDTAD-modified cassava stalks loaded with Fe3O4: highly efficient removal of Pb2+ and Zn2+ from aqueous solution. Environ Sci Pollut Res 28, 6733–6745 (2021). https://doi.org/10.1007/s11356-020-10858-1
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DOI: https://doi.org/10.1007/s11356-020-10858-1