Performance and mechanism of La-Fe metal-organic framework as a highly efficient adsorbent for fluoride removal from mine water

•The synthesized MOFs adsorbed fluorine efficiently through synergistic action.•The maximum adsorption capacity of La-Fe@PTA was 95 mg/g for fluoride ions.•The synthesized adsorbent has good practical application to mine water. Water fluoride pollution has caused non-negligible harm to the environme...

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Published in:Journal of environmental sciences (China) 2024-05, Vol.139, p.245-257
Main Authors: Jia, Chaomin, Wang, Jianbing, Wang, Huijiao, Zhu, Sichao, Zhang, Xiaohui, Wang, Yuxiang
Format: Article
Language:English
Subjects:
adsorbents
Adsorption
calcium
coordination polymers
defluoridation
electrostatic interactions
Fluoride ion
fluorides
fluorine
ion exchange
kinetics
La-Fe@PTA
Mechanism
Mine water
pollution
sorption isotherms
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Summary:•The synthesized MOFs adsorbed fluorine efficiently through synergistic action.•The maximum adsorption capacity of La-Fe@PTA was 95 mg/g for fluoride ions.•The synthesized adsorbent has good practical application to mine water. 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 SO42‒, Cl‒, NO3‒, Ca2+ and Mg2+, CO32‒ and HCO3‒ 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. [Display omitted]
ISSN:1001-0742
DOI:10.1016/j.jes.2023.05.039