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Materials 2018, 11(5), 769; https://doi.org/10.3390/ma11050769

Enhanced Uptake of Iodide from Solutions by Hollow Cu-Based Adsorbents

1
Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province, Faculty of Chemical Engineering, Huaiyin Institute of Technology, Huaian 223003, China
2
State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China
3
School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
*
Authors to whom correspondence should be addressed.
Received: 10 April 2018 / Revised: 8 May 2018 / Accepted: 9 May 2018 / Published: 10 May 2018
(This article belongs to the Section Porous Materials)
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Abstract

Cu2O exhibits excellent adsorption performance for the removal of I anions from solutions by doping of metallic Ag or Cu. However, the adsorption process only appears on the surface of adsorbents. To further improve the utilization efficiencies of Cu content of adsorbents in the uptake process of I anions, hollow spheres of metallic Cu, Cu/Cu2O composite and pure Cu2O were prepared by a facile solvothermal method. Samples were characterized and employed for the uptake of I anions under various experimental conditions. The results show that Cu content can be tuned by adjusting reaction time. After the core was hollowed out, the uptake capacity of the samples increased sharply, and was proportional to the Cu content. Moreover, the optimal uptake was reached within only few hours. Furthermore, the uptake mechanism is proposed by characterization and analysis of the composites after uptake. Cu-based adsorbents have higher uptake performance when solutions are exposed to air, which further verified the proposed uptake mechanism. Finally, hollow Cu-based adsorbents exhibit excellent selectivity for I anions in the presence of large concentrations of competitive anions, such as Cl, SO42− and NO3, and function well in an acidic or neutral environment. Therefore, this study is expected to promote the development of Cu-based adsorbents into a highly efficient adsorbent for the removal of iodide from solutions. View Full-Text
Keywords: Cu-based adsorbent; hollow structure; iodide; uptake; air Cu-based adsorbent; hollow structure; iodide; uptake; air
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Mao, P.; Jiang, J.; Pan, Y.; Duanmu, C.; Chen, S.; Yang, Y.; Zhang, S.; Chen, Y. Enhanced Uptake of Iodide from Solutions by Hollow Cu-Based Adsorbents. Materials 2018, 11, 769.

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