Comparison of fluorine removal performance and mechanism of spheroidal magnesium oxide before and after lanthanum modification

Zhang, Qiang; Zhou, Yuming; Yao, Qingzhao; Zhang, Fan‐Li; Chen, Wanying; Liu, Yang

doi:10.1007/s11356-022-21177-y

Cited by 12 publications

(2 citation statements)

References 43 publications

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“…There was an obvious peak at the wavelength of 3429 cm −1 , accompanied by adsorption peaks at 1470 cm −1 and 1098 cm −1 , which exhibited a characteristic O-H stretch band. It indicated that the material contained hydroxy groups [47]. By comparing the infrared spectra before and after adsorption, it was found that the peak strength of the hydroxyl group before adsorption was weaker than that after adsorption, in the range of 3200-3600 cm −1 .…”

Section: Adsorption Characterizationmentioning

confidence: 97%

The Constructing of the Oxide Phase Diagram for Fluoride Adsorption on La-Fe-Al: A Collaborative Study of Density Functional Calculation and Experimentation

Xie,

Xiao,

Huang

et al. 2024

Nanomaterials

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In recent years, fluoride pollution in water is a problem that has attracted much attention from researchers. The removal of fluoride-containing wastewater by adsorption with metal oxide as an adsorbent is the most common treatment method. Based on this, the effect of the doping ratio of La2O3, Fe2O3, and Al2O3 on the fluoride-removal performance was discussed by constructing a phase diagram. In this study, the adsorption mechanism of nanocrystalline lanthanum oxide terpolymer was investigated by density functional theory calculation and experiment. The optimal pH condition selected in the experiment was three, and the adsorption kinetics of fluoride ions were more consistent with the quasi-second-order kinetic model. The adsorption thermodynamics was more consistent with the Langmuir model. When the La-Fe-Al ternary composite oxides achieved the optimal adsorption efficiency for fluoride ions, the mass synthesis ratio was Al2O3:(Fe2O3:La2O3 = 1:2) = 1:100, resulting in a fluoride ion removal rate of up to 99.78%. Density functional calculations revealed that the La-Fe-Al ternary composite oxides had three important adsorption sites for La, Fe, and Al. Among them, the adsorption capacity for HF was Fe2O3 > La2O3 > Al2O3, and for F− was La2O3 > Al2O3 > Fe2O3. This provided good guidance for designing adsorbents to remove fluoride.

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Section: Adsorption Characterizationmentioning

confidence: 97%

The Constructing of the Oxide Phase Diagram for Fluoride Adsorption on La-Fe-Al: A Collaborative Study of Density Functional Calculation and Experimentation

Xie,

Xiao,

Huang

et al. 2024

Nanomaterials

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show abstract

“…Atoms such as O and F can generate hydrogen bonds. The stronger the hydrogen bond, the wider the tensile vibration band, and the higher the absorption intens [53,54].…”

Section: Ftir Analysismentioning

confidence: 99%

Efficient Fluoride Removal Using Nano MgO: Synthesis, Mechanisms, and Performance Evaluation

Liu

Lei

et al. 2023

Preprint

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In this study, highly efficient fluoride removal of nano MgO was successfully synthesized using a simple hydrothermal precipitation method. CTMAB was used as a surfactant, and its long-chain structure tightly wrapped around the precursor crystal of basic magnesium chloride, inhibiting the growth of the precursor crystals, reducing their size and improving the dispersion of the crystals, enhancing the adsorption of nano MgO to fluoride. The adsorption performance of nano MgO for fluoride was investigated through the discussion of adsorption isotherms and kinetics,. The results indicate that the adsorption behavior of fluoride by magnesium oxide can be described by pseudo-second-order kinetics and the Langmuir isotherm model. The maximum adsorption capacity for fluoride was determined to be 122.27 mg/g. Additionally, factors that may affect the adsorption performance in practical applications, such as pH and competing ions, were also examined. Fourier-transform infrared and X-ray photoelectron spectroscopy analyses demonstrated that the nano MgO exhibited preferential adsorption of fluoride through specific inner-sphere complexation. The defluorination mechanisms of the nano MgO mainly included Mg2+-O defect, pore filling, ion exchange, and surface adsorption. The experimental findings unequivocally demonstrate the remarkable potential of the employed nano MgO in the efficacious removal of fluoride.

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Efficient fluoride removal using nano MgO: mechanisms and performance evaluation

Liu,

Ai,

Lei

et al. 2024

Environ Sci Pollut Res

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Comparison of fluorine removal performance and mechanism of spheroidal magnesium oxide before and after lanthanum modification

Cited by 12 publications

References 43 publications

The Constructing of the Oxide Phase Diagram for Fluoride Adsorption on La-Fe-Al: A Collaborative Study of Density Functional Calculation and Experimentation

The Constructing of the Oxide Phase Diagram for Fluoride Adsorption on La-Fe-Al: A Collaborative Study of Density Functional Calculation and Experimentation

Efficient Fluoride Removal Using Nano MgO: Synthesis, Mechanisms, and Performance Evaluation

Efficient fluoride removal using nano MgO: mechanisms and performance evaluation

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