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. 2019 Nov 25;9(12):1687. doi: 10.3390/nano9121687

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Adsorption isotherms for (a) Langmuir, (b) Freundlich, (c) Temkin, and (d) Redlich–Peterson models for Pb(II) on PAC@Fe₃O₄ at 323, 313, and 303 K (dose = 1.5 g L⁻¹ and pH 5).