title: Comparative study of adsorption capacity of mesoporous silica materials for molsidomine: effects of functionalizing and solution pH.
abstract: 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 pH4.8. Aminopropyl modified silica adsorbs the lowest amount of molsidomine and the adsorption was observed only at pH7.4. Interactions responsible for the adsorption were elucidated by spectroscopic studies.
authors.affiliation: G.A. Krestov Institute of Solution Chemistry of Russian Academy of Sciences, 1 Akademicheskaya Str., Ivanovo, Russian Federation.
authors.forename: N A
authors.initials: NA
authors.lastname: Alyoshina
authors.affiliation: G.A. Krestov Institute of Solution Chemistry of Russian Academy of Sciences, 1 Akademicheskaya Str., Ivanovo, Russian Federation.
authors.forename: A V
authors.initials: AV
authors.lastname: Agafonov
authors.affiliation: G.A. Krestov Institute of Solution Chemistry of Russian Academy of Sciences, 1 Akademicheskaya Str., Ivanovo, Russian Federation. Electronic address: evp@isc-ras.ru.
authors.forename: E V
authors.initials: EV
authors.lastname: Parfenyuk
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D008981:Molsidomine / Q000737:chemistry*; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D013499:Surface Properties; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D012996:Solutions; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide; D008981:Molsidomine
keywords: Adsorption interactions; Mesoporous silica; Molsidomine; Solution pH; Surface functional groups