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. 2019 Jul 2;11(7):1125. doi: 10.3390/polym11071125

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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 of Cu²⁺, Pb²⁺, and Cd²⁺ onto DTC-g-PE-DA@GB@PU (a) and Pd²⁺, Pt⁴⁺, and Au³⁺ onto PE-DA@GB@PU (b). Other conditions: solution pH = 6 for DTC-g-PE-DA@GB@PU, solution pH = 0 for PE-DA@GB@PU; volume, 20 mL; adsorbent dose, 20 mg; contact time: 30 min for PE-DA@GB@PU; 60 min for DTC-g-PE-DA@GB@PU, temperature, 25 °C; n = 3.