Low-Cost Goethite Nanorods for As (III) and Se (VI) Removal from Water
| Autor: | Adham E. Ragab, Mohamed Ramadan, Tamer M. Khalaf, Mokhtar Ali Amrani, Atef M. Ghaleb |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Goethite
Ionic bonding 02 engineering and technology 010501 environmental sciences 01 natural sciences Selenate lcsh:Technology Arsenic lcsh:Chemistry chemistry.chemical_compound Hydrolysis Selenium Adsorption General Materials Science heavy metals Instrumentation lcsh:QH301-705.5 0105 earth and related environmental sciences Arsenite Fluid Flow and Transfer Processes water pollution lcsh:T Process Chemistry and Technology iron oxy-hydroxide General Engineering water treatment 021001 nanoscience & nanotechnology lcsh:QC1-999 Computer Science Applications chemistry lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 visual_art visual_art.visual_art_medium Nanorod Water treatment 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:Physics Nuclear chemistry |
| Zdroj: | Applied Sciences, Vol 10, Iss 7237, p 7237 (2020) Applied Sciences Volume 10 Issue 20 |
| ISSN: | 2076-3417 |
| Popis: | Arsenite (As(III)) and Selenate (Se(VI)) are universally touted as extremely toxic oxyanions in natural and industrial water systems. Thus, the production of low-cost adsorbents that are scalable and toxic-free is of great importance today. In this work, a large-scale goethite nanorods (&alpha FeOOH NRs) is synthesized using a modified rapid hydrolysis method. The obtained powder is characterized using different multidisciplinary techniques. Accordingly, the results showed uniform and straight nanorods (length ~400 nm and diameter ~40 nm) resembling cigar-like morphology while the structure is confirmed to be of orthorhombic &alpha FeOOH phase. The potential application of this material to adsorb As (III) and Se (VI) ions in water is explored. In particular, for initial adsorbate concentrations (~500 µ g/L), the removal efficiencies are found exceptional with &alpha FeOOH doses of 0.33 g/L and ~0.5 g/L for As (III) and Se (VI), respectively. Attractively, the adsorption capacities were estimated using trusted isotherms and then experimentally verified at ultimately high concentrations. Besides, a pH-controlled adsorption study showed that a pH of 5&ndash 8 is a favored range for higher ionic uptake, which meets the World Health Organization (WHO) benchmarks of drinking water. To conclude, the &alpha FeOOH NRs are potential adsorbent for the sustainable removal of toxin ions in water systems. |
| Databáze: | OpenAIRE |
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