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. 2020 May 19;10(5):785. doi: 10.3390/biom10050785

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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(a) Comparison of percentage adsorption by changing the concentration of green-synthesized AI-MnO NAPs (F-value = 3031.63, p < 0.05). (b) Comparison of percentage adsorption at different pH values (F-value = 38,499.3, p < 0.05). (c) A possible Cr(VI) adsorption mechanism on the surface of the green-synthesized AI-MnO NAPs.