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- W2973291465 abstract "Abstract In this study, the microstructure of sulfidated nanoscale zero-valent iron (S-nZVI), and the reaction mechanism with cadmium (Cd) were investigated. Combining with spherical aberration-corrected scanning transmission electron microscope (Cs-STEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Fourier transformed infrared (FTIR), it was found that the one-step synthesized S-nZVI with Na2S as the sulfidation reagent is irregular in shape and consisted of heterogeneous mixtures of Fe0, amorphous FeS, and Fe3O4. The dominant reaction mechanism between S-nZVI and Cd is displacement of Fe in FeS and the formation of CdS. The effects of Cd initial concentration, Mg2+, NO3−, and humic acid (HA) on the reaction kinetics were also studied. The removal capacity of Cd by S-nZVI can reach up to 495 mg/g, which is significantly higher than other S-nZVI and adsorbents. The reactions follow pseudo-second-order adsorption model, with chemisorption as the rate limiting step during the displacement reaction. Low concentration of Mg2+ (" @default.
- W2973291465 created "2019-09-26" @default.
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- W2973291465 date "2020-02-01" @default.
- W2973291465 modified "2023-10-16" @default.
- W2973291465 title "The removal of Cd by sulfidated nanoscale zero-valent iron: The structural, chemical bonding evolution and the reaction kinetics" @default.
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- W2973291465 doi "https://doi.org/10.1016/j.cej.2019.122933" @default.
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