Novel magnetic metal-organic framework derivative: An adsorbent for efficient removal of fluorine-containing wastewater in mines

Zhou, Gang; Meng, Qunzhi; Li, Shuailong; Song, Ruixin; Wang, Qi; Xu, Zhuo; Xing, Zhanyi

doi:10.1016/j.jece.2022.108421

Cited by 13 publications

(6 citation statements)

References 47 publications

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“…Most fluoride ions exist in the form of electrically neutral HF (pKa HF = 2.95) [52] when pH < 3, which can reduce the columbic forces between LMF11 NFs and adsorbate [42]. Meanwhile, the diminished binding amount at higher pH conditions is attributed to electrostatic repulsion between F − and negatively charged LMF11 NFs along with the competition between F − and OH − for active sites [41]. Additionally, the equilibrium pH of the F − solution changed from 2 to 2.18, 3−5.49, 4-6.59, 5-6.75, 6-6.59, 7-6.34, 8-6.83, 9-7.14 after adsorption, respectively.…”

Section: The Effect Of Phmentioning

confidence: 99%

“…Whereas, easy agglomeration is the major obstacle for the large-scale application of Fe 3 O 4 nanoparticles. To overcome the limit of Fe 3 O 4 nanoparticles, numerous magnetic adsorbents were fabricated by coating metal oxides on Fe 3 O 4 nanoparticles to form core-shell composites or by loading Fe 3 O 4 and other metal oxides on the carrier [41]. For example, graphene oxide (GO) supported Fe-Al oxide adsorbent (IAO/GO) fabricated by Liu et al [42] showed a maximum binding amount of 64.72 mg F − /g for fluoride.…”

Section: Introductionmentioning

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: The Effect Of Phmentioning

confidence: 99%

Section: Introductionmentioning

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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“…In Figure c, Fe 3 O 4 @MOF-Co has an obvious absorption peak in the range of 1348–1524 cm –1 , which is caused by the O–C–O bond stretching vibration. Also, the absorption peaks of Co–O and Fe–O appear at 718 and 570 cm –1 , respectively, indicating that Fe 3 O 4 @MOF-Co has successfully recombined Figure d shows the SEM image of MOF(Co), which is compatible with it's c rystal structure characteristics.…”

Section: Resultsmentioning

confidence: 61%

Modulating the Energy-Band of Metal Oxide@Metal–Organic Framework Core–Shell Nanoparticles for Enhanced Raman Sensing

Li,

Yang,

et al. 2024

ACS Appl. Nano Mater.

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Surface-enhanced Raman scattering spectroscopy (SERS) can provide molecular fingerprint peaks of the vibration information with great specificity and sensitivity. It is widely used in biomedical and chemical fields. Semiconductor-based substrates represent a hot spot in the field of SERS beyond conventional noble metals, and metal−organic frameworks are rarely realized for SER detection. Here, we modulate the energy-band structures of metal−organic frameworks (MOFs) further by metal oxides (MOs) to match the energy band of a target analyte. We construct MOF-encapsulated metal oxide core−shell nanoparticles (MO@ MOFs) as substrates for Raman enhancement. Attributed to the high structural tailorability of both core and shell, a series of energy-band structures have been created. We perform SERS detection of rhodamine b (RhB) on MO@MOF and find that the enhanced factor of Fe 3 O 4 @MOF(Co) and TiO 2 @MOF(Ni) reach as high as 10 8 and 10 6 , respectively, with low detection limits of 10 −8 M, much lower than that using the corresponding MOFs. The SERS enhancement is based on mechanisms including charge transfer, interband and molecule resonances, and ground-state charge-transfer interactions. This work will promote the application of semiconductor-based nanomaterials with special modularity for surface-enhanced Raman scattering substrates.

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“…The concentration of sulfate in fluorine-containing wastewater ranges from tens of thousands of mg/L. For example, the concentration of sulfate in the semiconductor industry may be hundreds of mg/L, the fertilizer industry may be tens of mg/L, and the battery industry may be as high as tens of thousands of mg/L. − Sulfate, as the main coexisting ion in high-fluorine wastewater, ,− was the focus of the research. However, previous studies have focused only on the influence of high concentrations (sulfate concentration above 1000 mg/L) of sulfate, which decreased the purity of calcium fluoride and inhibited the removal of fluoride ions by coprecipitation. ,,, The role of sulfate in the precipitation of calcium fluoride under low-saturation conditions (to ensure that the solubility product of calcium sulfate in the solution is lower than the solubility of sulfate to avoid the formation of calcium sulfate) were ignored.…”

Section: Introductionmentioning

confidence: 99%

Sulfate Doping Promotes Agglomeration of Calcium Fluoride Crystals

Wang,

Zhang,

et al. 2024

Environ. Sci. Technol.

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Calcium salt precipitation is an effective solution to wastewater fluoride pollution. The purity and precipitation efficiency of calcium fluoride is critical for its removal and recovery. This study aimed to reveal the role of coexisting sulfates in the precipitation of calcium fluoride. A low sulfate concentration promoted calcium fluoride precipitation. The size of calcium fluoride-aggregated particle clusters increased from 750 to 2000 nm when the molar ratio of sulfate to fluoride was increased from 0 to 3:100. Sulfate doped in the calcium fluoride crystals neutralized the positive charge of the calcium fluoride. Online atomic force microscopy measurements showed that sulfate reduced the repulsive force between calcium fluoride crystals and increased the adhesion force from 1.62 to 2.46 nN, promoting the agglomeration of calcium fluoride crystals. Sulfate improved the precipitation efficiency of calcium fluoride by promoting agglomeration; however, the purity of calcium fluoride was reduced by doping. Sulfate reduced the induction time of calcium fluoride crystallization and improved the nucleation rate of calcium fluoride. Sulfate should be retained to improve the precipitation of calcium fluoride and to avoid its loss from the effluents. However, it is necessary to separate sulfate from fluoride to obtain highpurity calcium fluoride. Therefore, sulfate concentration regulation in high-fluoride wastewater is key to achieving the efficient removal and recovery of fluoride ions.

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Novel magnetic metal-organic framework derivative: An adsorbent for efficient removal of fluorine-containing wastewater in mines

Cited by 13 publications

References 47 publications

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

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

Modulating the Energy-Band of Metal Oxide@Metal–Organic Framework Core–Shell Nanoparticles for Enhanced Raman Sensing

Sulfate Doping Promotes Agglomeration of Calcium Fluoride Crystals

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