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- Title
Applicability assessment of LECA and α-Fe<sub>2</sub>O<sub>3</sub>@LECA for removing nitrate from drinking water.
- Authors
Vesali, Zahra; Zare, Mohammad; Sabbaghi, Samad
- Abstract
In this study we investigated the potential of lightweight expanded clay aggregate (LECA), a material used in the construction industry, and its doped form (α-Fe2O3@LECA), as new adsorbents for nitrate treatment in drinking water. Their characteristics were analysed, including morphology via scanning electron microscopy, particle zeta potential through the dynamic light scattering method, and field emission scanning electron microscopy. To elucidate the mechanisms and potential of nitrate removal, and optimize the influential factors, we considered the initial nitrate concentration 100, 200 mg/L, adsorbent dose 10, 20, 30, 50, and 70 g/L, contact time 0.5, 1, 3, and 5 h, and aqueous pH levels ~2, ~4.5, and ~7. The results showed that maximum nitrate adsorption was approximately 35% after a contact time of 0.5 h in a solution containing 10 g/L LECA and an initial nitrate concentration of 100 mg/L. However, this process rapidly diminished with the continuation of the contact time, proving a "desorption phenomenon" occurring in the solution. In the case of α-Fe2O3@LECA, the maximum adsorption was around 65% at the contact time up to 1.75 h, but a similar trend was observed. Overall, since the desorption of nitrate ions occurs rapidly and is not desirable for practical use, further research on these adsorbents may clarify their practical efficiencies in treating other non-desirable substances.
- Subjects
ZETA potential; FIELD emission electron microscopy; DRINKING water; NITRATES; Z bosons
- Publication
Desalination & Water Treatment, 2023, Vol 316, p408
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2023.30210