Development of hollow δ-FeOOH structures for mercury removal from water
| Autor: | Márcio C. Pereira, Guilherme Lages, Luiz C.A. Oliveira, Bruno Lemos Batista, Luiz F O Maia, Márcia C. S. Faria, Jairo Lisboa Rodrigues, Patricia C. C. Ladeira |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
mercury
chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Environmental technology. Sanitary engineering Mercury (element) chemistry adsorption Environmental chemistry feooh 0210 nano-technology hollow structures TD1-1066 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Water Practice and Technology, Vol 16, Iss 4, Pp 1224-1233 (2021) |
| Popis: | δ-FeOOH, a magnetic iron oxyhydroxide, has a significant number of -OH groups on its surface. These provide an attractive platform for heavy metal species in contaminated water, giving it potential as an adsorbent. Its performance can be improved by increasing the number of active surface sites. δ-FeOOH hollow structures were synthesized on a mesoporous silica surface then treated with NaOH solution. X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed that structure synthesis was successful. δ-FeOOH, 5,27 nm, hollow crystals were produced with 63 m2 g−1 surface area and 20 nm average pore size. The point of zero charge was 4.72, which is beneficial for Hg(II) adsorption near neutral pH. The maximum Hg(II) adsorption capacity at pH 7 was determined as 89.1 mg g−1. The kinetics data were best fitted by a pseudo-second-order model with k2 equal 0,1151 g mg−1min−1. Finally, a nanomaterial filter was developed and used to remove mercury in water samples from a Brazilian river. HIGHLIGHTS δ-FeOOH hollow structures were prepared on a mesoporous silica surface using simple chemical treatment.; The δ-FeOOH hollow structures are an effective Hg(II) adsorbent.; The adsorbent had good anti-interference ability to co-existing anions and cations.; A filter made from the adsorbent treated water effectively from a Brazilian river. |
| Databáze: | OpenAIRE |
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