Highly efficient removal of As(V) by using NiAl layered double oxide composites
| Autor: | Muhammad Wakeel, Shimin Yang, Lei Chen, Hongshan Zhu, Changlun Chen, Njud S. Alharbi, Zhimin Lv, Abdul Wahid |
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| Rok vydání: | 2018 |
| Předmět: |
Nial
Materials science Intercalation (chemistry) General Physics and Astronomy 02 engineering and technology 010501 environmental sciences engineering.material 01 natural sciences Endothermic process law.invention chemistry.chemical_compound Adsorption law Calcination Composite material 0105 earth and related environmental sciences computer.programming_language Aqueous solution Layered double hydroxides Arsenate Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Surfaces Coatings and Films chemistry engineering 0210 nano-technology computer |
| Zdroj: | Applied Surface Science. 448:599-608 |
| ISSN: | 0169-4332 |
| Popis: | The NiAl layered double hydroxides (NiAl-LDHs) as well as NiAl layered double oxides (NiAl-LDOT, T: 300, 400, 500, 600 °C) were successfully synthesized by hydrothermal process and calcination treatment, and served as adsorbents for the efficient uptake of arsenate (As(V)) from aqueous solutions. Batch experiments were carried out at various solution pH, original As(V) concentration, contact time and calcination temperature. It was found that As(V) adsorption capacity on these composites can be changed by controlling the calcination temperature, and followed the order NiAl-LDO500 (198.1 mg/g) > NiAl-LDO400 (180.9 mg/g) > NiAl-LDO300 (160.2 mg/g) > NiAl-LDO600 (121.4 mg/g) > NiAl-LDH (60.7 mg/g), which could be ascribed to abundant surface adsorption sites and a “memory effect” provided by “Ni-O or Al-O” bonds. The thermodynamic experiments revealed that the elimination of As(V) was spontaneous and endothermic. In addition, multiple characterizations and batch experiments have been carried out to prove the surface adsorption and intercalation by rebuilding of primary layered structure contributed to As(V) adsorption. This discovery can provide a new insight into the elimination of As(V) from wastewater for environmental remediation. |
| Databáze: | OpenAIRE |
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