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. 2022 Jan 3;12(1):160. doi: 10.3390/nano12010160

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Effect of initial pH on Cu²⁺ adsorption; (a) CMCNF10-PEI (b) CMCNF20-PEI (c) CMCNF30-PEI. (d) Contact time removal capacity for Cu²⁺ adsorption (pH = 6, C₀ = 20 mg/L, T = 25 °C). (e) Plots of pseudo-first-order, and (f) pseudo-second-order of CMCNF10-PEI, CMCNF20-PEI, CMCNF30-PEI. (g) Effect of different initial concentration on Cu²⁺ adsorption of three CMCNFs-PEI (pH = 6, t = 24 h, T = 25 °C). (h) CMCNF10, (i) CMCNF20-PEI, (j) CMCNF30-PEI isotherm model for Cu²⁺ adsorption.