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Removal of Hg2+ by carboxyl-terminated hyperbranched poly(amidoamine) dendrimers grafted superparamagnetic nanoparticles as an efficient adsorbent

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Abstract

In this research, carboxyl-terminated hyperbranched poly(amidoamine) dendrimers grafted superparamagnetic nanoparticles (CT-HPMNPs) with core-shell structure were synthesized by the chemical co-precipitation method, the core of superparamagnetic iron oxide nanoparticles and a shell of polyamidoamines (PAMAM) and carboxyl groups, as a novel adsorbent for removing Hg2+ from aqueous systems. The surface of the particles was modified by 3-(aminopropyl) triethoxysilane, and finally, PAMAM and carboxyl dendrimers were grown on the surface up to 5.5 generation. The synthesized polymer was characterized physically and morphologically using different techniques. Also, they were evaluated in terms of adsorption capacity to remove inorganic pollutants of Hg2+, selectivity, and reusability. The adsorption mechanism Hg2+ onto CT-HPMNPs was investigated by single-step and two-step isotherms that the adsorption capacity of Hg2+ obtained 72.3 and 32.88 mg g−1 respectively at pH 5, adsorbent dosage 2 g L−1, Hg2+ initial concentrations 20 mg L−1, contact time 60 min, and temperature of 298 K by CT-HPMNPs. Also, the kinetics of Hg2+ followed the pseudo-second-order model and adsorption isotherms of Hg2+ onto CT-HPMNPs were fitted well by Freundlich (as a single-step) and two-step adsorption models with a correlation coefficient of 0.9997 and 0.9999 respectively. The results showed a significant potential of Hg2+ ions removing from industrial wastewater and spiked water by CT-HPMNPs.

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Acknowledgments

The authors gratefully acknowledge the support of the Department of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran.

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Authors and Affiliations

  1. Department of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Azam Alsadat Tabatabaiee Bafrooee & Amir Hesam Hasani

  2. Department of Chemistry, Central Tehran Branch, Islamic Azad University, Tehran, 1469669191, Iran

    Homayon Ahmad Panahi

  3. Department of Chemistry, Varamin (Pishva) Branch, Islamic Azad University, Tehran, Iran

    Elham Moniri & Mahsasadat Miralinaghi

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  1. Azam Alsadat Tabatabaiee Bafrooee
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Correspondence to Homayon Ahmad Panahi.

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Tabatabaiee Bafrooee, A.A., Ahmad Panahi, H., Moniri, E. et al. Removal of Hg2+ by carboxyl-terminated hyperbranched poly(amidoamine) dendrimers grafted superparamagnetic nanoparticles as an efficient adsorbent. Environ Sci Pollut Res 27, 9547–9567 (2020). https://doi.org/10.1007/s11356-019-07377-z

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