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Enhanced adsorption of copper ions by phosphoric acid-modified Paeonia ostii seed coats

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Abstract

Novel adsorbent, phosphoric acid-modified Paeonia ostii seed coats (PA-PSC) were successfully prepared by low-temperature pyrolysis to effectively remove Cu(II) from aqueous solution. The results revealed that equilibrium adsorption capacity (qe) of PA-PSC for Cu(II) was notably enhanced up to 4-folds compared with the raw PSC. FT-IR and XPS analyses suggested that the adsorption of Cu(II) by PA-PSC was primarily ascribed to electrostatic forces and complexing effects. Besides, equilibrium and kinetic studies demonstrated that Freundlich and pseudo-second-order models were the actually fairly good approximations of Cu(II) adsorption. Thermodynamic analysis revealed that the adsorption of Cu(II) onto PA-PSC was a chemical, endothermic, and spontaneous process. Lastly, reusability study further confirmed the applicability of PA-PSC as a promising adsorbent for removing Cu(II) from aqueous solution.

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Funding

This work was financially supported by the National Key R&D Program of China (Grant No.: 2017YFC0212404).

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Correspondence to Baozeng Ren.

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Responsible Editor: Tito Roberto Cadaval Jr

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Liu, Q., Han, R., Qu, L. et al. Enhanced adsorption of copper ions by phosphoric acid-modified Paeonia ostii seed coats. Environ Sci Pollut Res 27, 43906–43916 (2020). https://doi.org/10.1007/s11356-020-10296-z

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  • DOI: https://doi.org/10.1007/s11356-020-10296-z

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