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. 2017 Nov 17;7:15811. doi: 10.1038/s41598-017-16222-7

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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SEM image and the EDS elemental distribution mapping of CS-ED-CD after simultaneous adsorption of Cd(II) and BPS (initial concentration: 100 mg L⁻¹). The element of S acts as the indicator of BPS since only BPS contains sulphur. The signal spots of sulphur correlated with those of carbon and nitrogen. The distribution of Cd(II) coincided with the signal spots of oxygen, especially in the area of low oxygen signal there was lower Cd(II) loading.