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Studies on ultrafast and remarkable removal of phosphate from sewage water by metal-organic frameworks

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Abstract

In the proposed research, a lanthanum-doped metal-organic framework (La-ATP) has been synthesised to remove phosphate from contaminated aqueous solutions. La-ATP was synthesised by a green energy-saving route using microwave irradiation and exhibited a phenomenal sorption capacity of 290 mg/g for the removal of phosphate. At a minimal dose of 0.1 g/L, 25 mg/L of phosphate gets reduced to 6.3 mg/L within 5 min and reaches equilibrium in 25 min. The isoelectric point of La-ATP was found to be 8.99, and it is efficient in removing phosphate over a wide range of pH 5–10. The existence of commonly occurring competing anions like sulphate, fluoride, chloride, arsenate, bicarbonate, and nitrate does not affect the uptake capacity of La-ATP towards phosphate ions. Furthermore, the robustness of La-ATP is demonstrated by its applicability to remove phosphate from real-life sewage water by reducing 10 mg/L of phosphorus from sewage water to < 0.02 mg/L. The primary mechanism governing phosphate removal was found to be ionic interaction and ligand exchange. Therefore, La-ATP can be considered a viable candidate for the treatment of eutrophic water streams because of its high sorption capacity, super-fast kinetics, and adaptability to contaminated sewage.

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Acknowledgements

Thematic Unit of Excellence on Soft Nanofabrication, Advance Centre for Material Science, and Advanced Imaging Centre at IIT Kanpur are acknowledged for various characterisation studies.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Nalini Sankararamakrishnan: conceptualization, methodology, visualisation, investigation, supervision, writing—original draft, review and editing. Neha Singh: data curation, investigation, validation, writing—original draft, review and editing. Ila Srivastava: investigation, data curation, writing—review and editing. Pavan Nagar: investigation, data curation.

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Correspondence to Nalini Sankararamakrishnan.

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Singh, N., Srivastava, I., Nagar, P. et al. Studies on ultrafast and remarkable removal of phosphate from sewage water by metal-organic frameworks. Environ Monit Assess 195, 1378 (2023). https://doi.org/10.1007/s10661-023-11962-8

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  • DOI: https://doi.org/10.1007/s10661-023-11962-8

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