Micro-mesoporous modified activated carbon from corn husks for removal of hexavalent chromium ions
| Autor: | Sahar M. Mousa, Nabila S. Ammar, Hanan S. Ibrahim, Nady A. Fathy |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Langmuir
Aqueous solution Kinetic models Water supply for domestic and industrial purposes Chromium ion (VI) chemistry.chemical_element Sorption chemistry.chemical_compound Adsorption chemistry medicine Freundlich equation Isotherm models Hexavalent chromium Carbon Removal TD201-500 Water Science and Technology Activated carbon medicine.drug Nuclear chemistry |
| Zdroj: | Applied Water Science, Vol 11, Iss 9, Pp 1-12 (2021) |
| ISSN: | 2190-5495 2190-5487 |
| Popis: | Modified activated carbon sorbents (ACP-Zn and ACP-Zn-Fe) had been prepared from the activation of corn husks precursor to increase the chemical activity of the resulting adsorbents by increasing the number of active functional groups and generation of micro-mesoporous structures. Fourier transform infrared (FTIR) assessed the acidic surface properties of the prepared activated carbons that is due to the presence acidic functional groups such as –OH and –COOH which improves the removal efficiency of the produced sorbents. Textural characteristics revealed the generation of micro-mesoporous structures in ACP–Zn and ACP-Zn-Fe. Thus the combination of H3PO4 with Zn or Zn–Fe could enhance the mesoporosity with a considerable decrease in the adsorption of nitrogen. However, the formation of mesopores might be attributed to the template-like effects of the obtained Zn- of Zn-Fe compounds inside the carbon structure. These structures were employed as sorbents for removal of hexavalent chromium Cr(VI) ions from its aqueous solutions, and the removal efficiency reached ~ 86% for ACP-Zn-Fe and ~ 82% for ACP-Zn. The kinetic modeling studies revealed that the sorption process follows the pseudo-second-order model which indicates that the mechanism of process is chemisorptions. Freundlich, Langmuir and Dubinin–Radushkevich (D–R) models were used to express the experimental data. The isotherm modeling studies revealed that the sorption process was fit with both Freundlich and Langmuir models with maximum capacity 24.8 and 30.3 mg/g for ACP-Zn and ACP-Zn-Fe, respectively. |
| Databáze: | OpenAIRE |
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