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

Liu, Qiong; Han, Runping; Qu, Lingbo; Ren, Baozeng

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

2020

Liu, Qiong | Han, Runping | Qu, Lingbo | Ren, Baozeng

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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