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. 2014 Jan 27;7(2):673–726. doi: 10.3390/ma7020673

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 13. — (a) Functional groups of MCM–41BTU and (b) adsorption isotherm for adsorption of Hg²⁺ on MCM–41 BTU. The initial sharp part of adsorption isotherm is related to adsorption by 3-aminopropyl residuals. Reprinted with permission from [188]. Copyright 2003 Springer Science and Business Media.