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. 2019 Mar 5;14:78. doi: 10.1186/s11671-019-2914-1

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 6 — Reusability test of CNT-Cu-30-1 nanocomposite as a catalyst for the reduction of 4-nitrophenol with NaBH₄