Journal
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 40, Issue -, Pages 164-171Publisher
ELSEVIER
DOI: 10.1016/j.msec.2014.03.052
Keywords
Mesoporous silica; Surface functional groups; Molsidomine; Solution pH; Adsorption interactions
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Adsorption capacities of mesoporous silica materials having various surface functional groups (hydroxyl, phenyl, mercaptopropyl, aminopropyl) at pH values of 4.8, 7.4, and 8.0 were studied. It was found that the maximum amount of adsorbed molsidomine is affected by method of preparation of the silica materials, chemistry of their surfaces and solution pH from where adsorption is carried out. The effects were explained by different states of the adsorbents and molsidomine in solution at the studied pH. The most efficient adsorption of molsidomine is observed onto phenyl modified silica prepared by grafting at pH 4.8. Aminopropyl modified silica adsorbs the lowest amount of molsidomine and the adsorption was observed only at pH 7.4. Interactions responsible for the adsorption were elucidated by spectroscopic studies. (C) 2014 Elsevier B.V. All rights reserved.
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