Performance and mechanism of La-Fe metal-organic framework as a highly efficient adsorbent for fluoride removal from mine water.
J Environ Sci (China)
; 139: 245-257, 2024 May.
Article
de En
| MEDLINE
| ID: mdl-38105052
ABSTRACT
Water fluoride pollution has caused non-negligible harm to the environment and humans, and thus it is crucial to find a suitable treatment technology. In this study, La-Fe@PTA adsorbent was synthesized for the defluoridation of mine water. The results showed that the optimum conditions for defluoridation by La-Fe@PTA were pH close to 7.0, the initial F- concentration of 10 mg/L, the dosage of 0.5 g/L and the adsorption time of 240 min. Compared with SO42â, Clâ, NO3â, Ca2+ and Mg2+, CO32â and HCO3â presented severer inhibition on fluoride uptake by La-Fe@PTA. The adsorption process fits well with the pseudo-second-order kinetic model and Freundlich model, and the maximum adsorption capacity of Langmuir model was 95 mg/g. Fixed-bed adsorption results indicated that fluoride in practical fluorinated mine water could be effectively removed from 3.6 mg/L to less than 1.5 mg/L within 130 bed volume (BV) by using 1.5 g La-Fe@PTA. Furthermore, the adsorbent still had good adsorption capacity after regeneration, which confirms the great application potential of La-Fe@PTA as a fluoride ion adsorbent. The mechanism analysis showed that La-Fe@PTA adsorption of fluorine ions is a physicochemical reaction driven by electrostatic attraction and ion exchange.
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Polluants chimiques de l'eau
/
Purification de l'eau
/
Réseaux organométalliques
Limites:
Humans
Langue:
En
Journal:
J Environ Sci (China)
/
Journal of Environmental Sciences (China)
/
Journal of environmental sciences (Online)
Sujet du journal:
SAUDE AMBIENTAL
Année:
2024
Type de document:
Article
Pays d'affiliation:
Chine
Pays de publication:
Pays-Bas