Mesoporous La-based nanorods synthesized from a novel IL-SFME for phosphate removal in aquatic systems

Xu, Jie; Cui, Yongmei; Wang, Rui; Wu, Chunxing; Li, Dongxiang

doi:10.1016/j.colsurfa.2021.126689

Cited by 7 publications

(6 citation statements)

References 38 publications

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“…This indicates that LMF11 NFs exhibit a higher fluoride removal rate at a lower F − concentration, resulting in a shorter time needed to attain the adsorption equilibrium. Similar results were observed in other La-modified adsorbents [54]. In addition, on the basis of the three-segment linear fitting Weber and Morris model, the intercepts (C) are not zero (Figure 9d), reflecting that the defluoridation mechanism of LMF11 NFs is complex and composed of surface adsorption, intraparticle diffusion along with external liquid film diffusion [48].…”

Section: Fluoride Adsorption Isothermsupporting

confidence: 81%

“…Whereas the binding capacity drops quickly from 9 to 52.16 mg F − /g with the rise of PO4 3− concentration from 0 to 100 mg/L, manifesti remarkable competitive effect of PO4 3− on defluoridation. This may be explained by Ksp of LaPO4 (3.7 × 10 −23 ) [54], which favors PO4 3− to displace the adsorbed F − on LM NFs compared with that of LaF3, thereby deteriorating the fluoride binding capacity. same result has also been reported by several studies using rare earth element-based terials for fluoride remediation [27,57].…”

Section: The Effect Of Interfering Anionsmentioning

confidence: 99%

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Template-Free Synthesis of Magnetic La-Mn-Fe Tri-Metal Oxide Nanofibers for Efficient Fluoride Remediation: Kinetics, Isotherms, Thermodynamics and Reusability

et al. 2022

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The occurrence of fluoride contamination in drinking water has gained substantial concern owing to its serious threat to human health. Traditional adsorbents have shortcomings such as low adsorption capacity and poor selectivity, so it is urgent to develop new adsorbents with high adsorption capacity, renewable and no secondary pollution. In this work, magnetic electrospun La-Mn-Fe tri-metal oxide nanofibers (LMF NFs) for fluoride recovery were developed via electrospinning and heat treatment, and its defluoridation property was evaluated in batch trials. Modern analytical tools (SEM, BET, XRD, FTIR) were adopted to characterize the properties of the optimized adsorbent, i.e., LMF11 NFs with a La:Mn molar ratio of 1:1. The surface area calculated via BET method and pHpzc assessed using pH drift method of LMF11 NFs were 55.81 m2 g−1 and 6.47, respectively. The results indicated that the adsorption amount was highly dependent on the pH of the solution, and reached the highest value at pH = 3. The kinetic behavior of defluoridation on LMF11 NFs was dominated by the PSO model with the highest fitted determination coefficients of 0.9999. Compared with the other three isotherm models, the Langmuir model described defluoridation characteristics well with larger correlation coefficients of 0.9997, 0.9990, 0.9987 and 0.9976 at 15 °C, 25 °C, 35 °C and 45 °C, respectively. The optimized LMF11 NFs exhibited superior monolayer defluoridation capacities for 173.30–199.60 mg F−/g at pH 3 at 15–45 °C according to the Langmuir isotherm model. A thermodynamic study proved that the defluoridation by LMF11 NFs is a spontaneous, endothermic along with entropy increase process. In addition, the LMF11 NFs still showed high defluoridation performance after three reused cycles. These findings unveil that the synthesized LMF11 NFs adsorbent is a good adsorbent for fluoride remediation from wastewater owing to its low cost, high defluoridation performance and easy operation.

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Section: Fluoride Adsorption Isothermsupporting

confidence: 81%

Section: The Effect Of Interfering Anionsmentioning

confidence: 99%

Template-Free Synthesis of Magnetic La-Mn-Fe Tri-Metal Oxide Nanofibers for Efficient Fluoride Remediation: Kinetics, Isotherms, Thermodynamics and Reusability

et al. 2022

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“…The La-based adsorbent possesses sharp and strong characteristic peaks at 2 θ = 16.8, 23.8, 29.1, 33.8, 41.6, 44.9, 48.4, 51.5, 54.4, 57.3, 60.0, 62.8, 65.4, 68.1, 70.4, 73.0, 75.6 and 77.9°, which is corresponded to La(COOH) 3 (JCPDS card No. 00-018-0674) reported in the literature 31,33,34 (Fig. 1d), suggesting that the La-based adsorbent is pure La(HCOO) 3 .…”

Section: Resultsmentioning

confidence: 54%

“…indicative of C-O asymmetric and symmetric vibrations, revealing the carboxylic groups in the methanoate. 33 The bands at 2914 cm −1 and 1354 cm −1 ascribed to the -CH stretching and bending mode illustrates the presence of methanoate, 31 manifesting that the La 3+ ions are successfully coordinated with the groups of -OOCH to generate the La(COOH) 3 . The peak located at 423 cm −1 represents the La-O stretching vibration in La(COOH) 3 .…”

Section: Adsorbent Characterizationmentioning

confidence: 99%