Fluoride excess in water represents an environmental issue and a risk for human health since it can cause several diseases, such as fluorosis, osteoporosis, and damage of the nervous system. Layered double hydroxides (LDHs) can be exploited to remove this contaminant from water by taking advantage of their high ion-exchange capability. LDHs are generally mixed with polluted water in the form of powders, which then cause the problem of uneasy separation of the contaminated LDH sludge from the purified liquid. In this work, Zn–Al LDH films were directly grown in situ on aluminum foams that acted both as the reactant and substrate. This method enabled the removal of fluoride ions by simple immersion, with ensuing withdrawal of the foam from the de-contaminated water. Different LDH synthesis methods and aluminum foam types were investigated to improve the adsorption process. The contact time, initial fluoride concentration, adsorbent dosage, and pH were studied as the parameters that affect the fluoride adsorption capacity and efficiency. The highest absorption efficiency of approximately 70% was obtained by using two separate growth methods after four hours, and it effectively reduced the fluoride concentration from 3 mg/L to 1.1 mg/L, which is below the threshold value set by WHO for drinking water.

Li, Y., Narducci, R., Varone, A., Kaciulis, S., Bolli, E., Pizzoferrato, R. (2021). Zn–al layered double hydroxides synthesized on aluminum foams for fluoride removal from water. PROCESSES, 9(12) [10.3390/pr9122109].

Zn–al layered double hydroxides synthesized on aluminum foams for fluoride removal from water

Narducci R.
;
Varone A.
;
Pizzoferrato R.
2021

Abstract

Fluoride excess in water represents an environmental issue and a risk for human health since it can cause several diseases, such as fluorosis, osteoporosis, and damage of the nervous system. Layered double hydroxides (LDHs) can be exploited to remove this contaminant from water by taking advantage of their high ion-exchange capability. LDHs are generally mixed with polluted water in the form of powders, which then cause the problem of uneasy separation of the contaminated LDH sludge from the purified liquid. In this work, Zn–Al LDH films were directly grown in situ on aluminum foams that acted both as the reactant and substrate. This method enabled the removal of fluoride ions by simple immersion, with ensuing withdrawal of the foam from the de-contaminated water. Different LDH synthesis methods and aluminum foam types were investigated to improve the adsorption process. The contact time, initial fluoride concentration, adsorbent dosage, and pH were studied as the parameters that affect the fluoride adsorption capacity and efficiency. The highest absorption efficiency of approximately 70% was obtained by using two separate growth methods after four hours, and it effectively reduced the fluoride concentration from 3 mg/L to 1.1 mg/L, which is below the threshold value set by WHO for drinking water.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/01
Settore FIS/03
Settore CHIM/01
Settore CHIM/12 - Chimica dell'Ambiente e dei Beni Culturali
Settore ING-IND/01
English
Con Impact Factor ISI
Coprecipitation; Fluoride adsorption; LDH; Urea hydrolysis; Water remediation; XPS
Li, Y., Narducci, R., Varone, A., Kaciulis, S., Bolli, E., Pizzoferrato, R. (2021). Zn–al layered double hydroxides synthesized on aluminum foams for fluoride removal from water. PROCESSES, 9(12) [10.3390/pr9122109].
Li, Y; Narducci, R; Varone, A; Kaciulis, S; Bolli, E; Pizzoferrato, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/290111
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