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- W3045112969 endingPage "141037" @default.
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- W3045112969 abstract "Nano-zero-valent iron has been used in combination with a variety of support carriers to remove heavy metals in solution. However, pre-treatment of the carrier can reflect a better synergistic effect and thus achieve high heavy metal removal capabilities. In this study, the hydrophilic biochar obtained by an acid ammonium persulfate oxidation has an adsorption capacity of up to 135.4 mg g −1 for Pb 2+ (25 °C, pH = 6 with adsorbent amount of 10 mg and Pb 2+ concentration of 50 mg L −1 ). Due to the strong Fe-C-O covalent bond, nZVI increases the binding force with the carbon matrix. Benefitting from the high specific surface area, porous structure and rich oxygen-containing functional groups, the resultant nZVI-HPB samples are favourable for Pb 2+ diffusion and adsorption, exhibiting maximum adsorption capacity of 480.9 mg g −1 (pH = 6, 25 °C with adsorbent amount of 10 mg and Pb 2+ concentration of 200 mg L −1 ). The multiple interaction mechanisms in the Pb 2+ removal process such as the reduction reaction, complexation and co-precipitation proceed simultaneously are concluded by the analyses of Fourier-Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) spectra. • nZVI-HPB nano-composites present superior performance for Pb 2+ removal. • Hydrophilic biochar demonstrates excellent synergy with nZVI particles. • Removal mechanisms of Pb 2+ on nZVI-HPB is investigated and illustrated." @default.
- W3045112969 created "2020-07-29" @default.
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- W3045112969 date "2020-12-01" @default.
- W3045112969 modified "2023-10-16" @default.
- W3045112969 title "Porous biochar-nanoscale zero-valent iron composites: Synthesis, characterization and application for lead ion removal" @default.
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- W3045112969 doi "https://doi.org/10.1016/j.scitotenv.2020.141037" @default.
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