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Adsorption removal of fluoride from polluted drinking waters using Mn-Al-La oxide

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Abstract

Trimetal oxides have received high attention in treatment of fluoride-polluted drinking waters. In this study, Mn-Al-La (MAL) oxide with a mole ratio of 2:1:1 was successively prepared and characterized by XRD, FTIR, XPS, and TEM. It exhibited as cotton-like assemblages (500–800 nm of axial lengths), and BET specific surface area was 52 m2/g. It was used to study fluoride adsorptions in aqueous solutions by batch experiments, under different adsorbent/adsorbate levels, times, temperatures, pH and coexisting anions, and treat simulated groundwater (with 2.85 mg/L fluoride and pH 7.0) by batch and column tests. Adsorption data well fitted to pseudo-second-order rate model (R2 = 0.996–0.999), and Langmuir (R2 = 0.962 − 0.997) and Freundlich (R2 = 0.964–0.989) isothermal models. Their maximum adsorption capacities could reach 45–113 mg/g. Only H2PO4 anions had a restrictive impact at pH 7.0, and there was a good removal ability at pH 3–9. Adsorption processes were spontaneous, endothermic, and random. Adsorption mechanisms were electrostatic interaction and ligand exchange at pH 7.0. Adsorption capacity could reach 73% of initial value at pH 7.0, after three cycles. All application data on the polluted groundwater treatments show MAL oxide is a potential adsorbent for fluoride removals.

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Funding

The authors received financial support from the National Natural Science Foundation of China (No.41472034) and the Natural Science Foundation of Jiangsu Province (BK20191444) for the present study.

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Yilei Deng: investigation, visualization, formal analysis, writing original draft. Shuyue Wang: investigation, methodology, validation. Kun Shi: investigation, data analysis. Huixin Xiong: conceptualization, methodology, validation, supervision, funding acquisition, writing review and editing.

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Correspondence to Huixin Xiong.

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The authors declare no competing interests.

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Responsible Editor: Tito Roberto Cadaval Jr

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Highlights

• Mn-Al-La oxide is the optimal adsorbent for fluoride removal.

• Fluoride removal efficiency can be affected by pH and phosphate ion.

• Adsorbent has higher fluoride adsorption capacity in acidic solutions.

• Mn-Al-La adsorbent has a potential application in groundwater treatment.

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Deng, Y., Wang, S., Shi, K. et al. Adsorption removal of fluoride from polluted drinking waters using Mn-Al-La oxide. Environ Sci Pollut Res 31, 7122–7137 (2024). https://doi.org/10.1007/s11356-023-31509-1

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  • DOI: https://doi.org/10.1007/s11356-023-31509-1

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