Effect of acid modification on adsorption of hexavalent chromium (Cr(VI)) from aqueous solution by activated carbon and carbon nanotubes
| Autor: | Tahar Laoui, Ihsanullah, Muataz Ali Atieh, Fahad Abdulaziz Al-Khaldi, Muhammad Imran Qureshi, Basel F. Abu-Sharkh, Abdalla M. Abulkibash |
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| Rok vydání: | 2015 |
| Předmět: |
Thermogravimetric analysis
Aqueous solution Inorganic chemistry Ocean Engineering 02 engineering and technology Carbon nanotube 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Pollution law.invention chemistry.chemical_compound Adsorption chemistry law Nitric acid medicine Water treatment Hexavalent chromium 0210 nano-technology 0105 earth and related environmental sciences Water Science and Technology Activated carbon medicine.drug |
| Zdroj: | Desalination and Water Treatment. 57:7232-7244 |
| ISSN: | 1944-3986 1944-3994 |
| DOI: | 10.1080/19443994.2015.1021847 |
| Popis: | The present study addresses the application of raw and modified carbon nanotubes (CNTs) and activated carbon (AC) for the removal of hexavalent chromium (Cr(VI)) from aqueous solution. Surfaces of both the adsorbents were modified by acid treatment. Nitric acid was used to remove impurities and to introduce carboxylic functional groups on the surfaces of CNTs and AC. Raw and modified adsorbents (CNTs and AC) were characterized by scanning electron microscopy, Brunauer–Emmett–Teller surface area analysis, and thermogravimetric analysis. The influence of adsorbent dosage, contact time, agitation speed, and solution pH were evaluated on the Cr(VI) removal efficiency using batch adsorption experiments. The optimum pH for maximum adsorption of Cr(VI) was found to be 3 and 4 for AC and CNTs, respectively. Modified and raw AC were able to remove 99 and 92% of Cr(VI) ions, respectively, at 75 mg adsorbent dosage, agitation speed of 200 rpm, initial Cr(VI) concentration of 1 mg/L, contact time of 4 h, and ... |
| Databáze: | OpenAIRE |
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