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Isotherm, kinetics, and adsorption mechanism studies of diethylenetriaminepentaacetic acid—modified banana/pomegranate peels as efficient adsorbents for removing Cd(II) and Ni(II) from aqueous solution

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Abstract

Two novel absorbents were synthesized for the first time by banana and pomegranate peels using diethylenetriaminepentaacetic acid (DTPA) modification to eliminate Cd(II) and Ni(II) of sewage. The DTPA-modified peels performed significantly higher adsorption capacity than unmodified materials. The maximum adsorption capacities of DTPA-modified banana/pomegranate peel were 46.729/46.296 mg/g for Cd(II), and 29.240/16.611 mg/g for Ni(II). Adsorption isotherm and kinetics models were simulated to determine their removal efficiency and potential for recovery of these two heavy metals. As the results, the adsorption reached equilibrium within 5 min and was well described by the pseudo-second order model and Langmuir isotherm. The surface morphology analysis of the synthetic materials by Scanning Electron Microscopy-Energy Dispersive X-ray spectroscopy, Fourier Transform Infrared spectroscopy, and X-ray Photoelectron Spectroscopy, implied that ion exchange, complexation, and physical adsorption may together contribute to Cd(II) and Ni(II) loading on DTPA-modified peels. This study demonstrates the feasibility of waste peels as cost-efficient bio-absorbents to remove Cd(II) and Ni(II) in sewage systems, and discovers potential adsorption mechanism of efficiency improvements after DTPA modification.

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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We gratefully acknowledge the technical supports from Instrument and Testing Center of Tianjin University of Science and Technology.

Funding

This work was supported by the National Natural Science Foundation of China (Grants 31800072, 31970084, 31400081) and the Open Fund of Ministry of Education Key Laboratory of Molecular Microbiology and Technology, Nankai University.

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Fanghui Wang: Conceptualization, Investigation, Data curation, Writing-original draft. Peng Wu: Investigation, Methodology, Writing-original draft. Lin Shu: Investigation, Review. Qingbin Guo: Review. Di Huang: Conceptualization, Supervision, Funding acquisition. Huanhuan Liu: Conceptualization, Supervision, Writing-original draft, Funding acquisition.

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Correspondence to Di Huang or Huanhuan Liu.

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The authors declare no competing interests.

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Responsible Editor: Tito Roberto Cadaval Jr

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Wang, F., Wu, P., Shu, L. et al. Isotherm, kinetics, and adsorption mechanism studies of diethylenetriaminepentaacetic acid—modified banana/pomegranate peels as efficient adsorbents for removing Cd(II) and Ni(II) from aqueous solution. Environ Sci Pollut Res 29, 3051–3061 (2022). https://doi.org/10.1007/s11356-021-15766-6

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  • DOI: https://doi.org/10.1007/s11356-021-15766-6

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