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. 2020 Jan 10;7:905. doi: 10.3389/fchem.2019.00905

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Copyright © 2020 Kong, Zhao, Li, Yang, Chen and Yang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Effects of adsorption time on the capacities of AFH for Cu²⁺, Cd²⁺, and Pb²⁺ ions, the plots of pseudo-first-order and pseudo-second-order kinetics models for (B) Cu²⁺, (C) Cd²⁺ and (D) Pb²⁺.