| Autor: |
Mingyue Piao, Xue Peng, Huishi Du, Hongxue Du, Wei Zhang, Yuwei Sun, Honghui Teng |
| Předmět: |
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| Zdroj: |
Desalination & Water Treatment; Sep2023, Vol. 307, p120-129, 10p |
| Abstrakt: |
Cadmium (Cd) emissions have a negative impact on both human health and the environment. Although nano zero-valent iron (nZVI) offers a lot of potential for water pollution treatment, it has been constrained by its instability and ease of aggregation. For the elimination of Cd(II) from aqueous solution, nZVI/MCM supported nZVI (nZVI/MCM-41/rGO) was designed to improve its dispersion and stability. It had a rough, porous structure with apparent Fe(0) crystallinity and slight rGO crystallinity. On the surface of nZVI/MCM-41/rGO, several oxygen-containing groups were detected. The specific surface area was 15.94 cm²/g, and the pore diameter was concentrated at 23.82 nm. The best performance was occurred at pH 6 with an adsorbent dosage of 2 g/L, and a maximum adsorption capacity of 31 mg/g was achieved after 600 min. Cd(II) removal process was well fitted with second-order kinetic, Langmuir and Freundlich isotherm. The thermodynamic parameter was also analyzed and proved that it was an endothermic (Î"H° > 0) and spontaneous (Î"G° < 0) progress. During adsorption, the crystal type and functional groups of nZVI/MCM-41/rGO did not change, but Fe(0) was oxidized. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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