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Fast and efficient adsorption of palladium from aqueous solution by magnetic metal–organic framework nanocomposite modified with poly(propylene imine) dendrimer

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Abstract

In this study, a magnetic metal–organic framework (MMOF) was synthesized and post-modified with poly(propyleneimine) dendrimer to fabricate a novel functional porous nanocomposite for adsorption and recovery of palladium (Pd(II)) from aqueous solution. The morphological and structural characteristics of the prepared material were identified by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmet–Teller (BET) isotherm, and vibrating sample magnetometer (VSM). The results confirmed the successful synthesis and post-modification of MMOF. Semispherical shape particles (20–50 nm) with appropriate magnetic properties and a high specific surface area of 120 m2/g were obtained. An experimental design approach was performed to show the effect of adsorption conditions on Pd(II) uptake efficiency of the dendrimer-modified magnetic adsorbent. The study showed that the Pd(II) uptake on dendrimer-modified MMOF was well described by the Langmuir isotherm model with the highest uptake capacity of 291 mg/g under optimal condition (adsorbent content of 12.5 mg, Pd ion concentration of 80 ppm, pH = 4, and contact time of 40 min). The adsorption kinetics of Pd(II) ions was suggested to be a pseudo-first-order model. The results revealed a faster adsorption rate and higher adsorption capacity (about 43%) for dendrimer-modified MMOF. Finally, the reusability of the provided adsorbent was evaluated. This work provides a valuable strategy for designing and developing efficient magnetic adsorbents based on MOFs for the adsorption and recovery of precious metals.

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Funding

MH thanks the Iran National Elites Foundation (INEF, Grant No. 15-89661) for the financial support.

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Hossein Shahriyari Far: investigation, methodology, visualization, and writing: original draft. Mahdi Hasanzadeh: conceptualization, supervision, resources, formal analysis, funding acquisition, project administration, and writing — review and editing. Mohammad Shabani Nashtaei: investigation, methodology, and visualization. Mahboubeh Rabbani: conceptualization, supervision, resources, formal analysis, and validation.

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Correspondence to Mahdi Hasanzadeh.

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The authors declare no competing interests.

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Responsible Editor: Philippe Garrigues

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Supplementary information

Magnetic hysteresis loops, comparison of experimental and predicted Pd(II) uptake, Langmuir, Freundlich, and Tempkin isotherm plots, regeneration cycles of adsorbents, structural stability of magnetic adsorbent, experimental results of Pd (II) uptakes, and ANOVA table.

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Far, H.S., Hasanzadeh, M., Nashtaei, M.S. et al. Fast and efficient adsorption of palladium from aqueous solution by magnetic metal–organic framework nanocomposite modified with poly(propylene imine) dendrimer. Environ Sci Pollut Res 28, 62474–62486 (2021). https://doi.org/10.1007/s11356-021-15144-2

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  • DOI: https://doi.org/10.1007/s11356-021-15144-2

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