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Öğe The effect of silane modification on the adsorptive properties of natural pyrophyllite and synthetic titanium-based powders prepared by the sol-gel process(Turkish Journal of Chemistry, 2005) Şener, Şadiye; Erdemoğlu, Murat; Asiltürk, Meltem; Sayılkan, HikmetAbstract: Our aim was to improve the relatively poor adsorption characteristics of natural pyrophyllite and those of TiOm and Ti(OR)x(OHy(O)z obtained from titanium tetraisopropoxide (TTIP) by the sol-gel process. For this purpose, the surfaces of the above-mentioned adsorbents were coated with a surface modifier by dipping them in 1% and 50% (w/w) solutions of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (DIAMO) in methanol. Realization of the coating processes was checked by FT-IR and SEM analyses. FT-IR analyses of the coated powders heat treated at 110 ?C showed that condensation took place between OH groups of prehydrolyzed silane molecules and hydroxyl groups and/or oxygen atoms on the surface of the powders, ensuring the attachment of the silane molecules to the surface. Adsorption properties of coated and uncoated adsorbents were compared. Adsorption percentage of natural pyrophyllite was 46.35% for 4-nitrophenol (4-NP) in aqueous solution, whereas 1% and 50% amino-coated pyrophyllite displayed 52.14% and 73.84% adsorption, respectively. The highest adsorption of 4-NP was realized when the calcinated powder obtained from the hydrolysis-condensation product of TTIP was coated with DIAMO from 50% solution.Öğe Hydrothermal synthesis, characterization and photocatalytic activity of nanosized TiO_2 based catalysts for rhodamine B degradation(Turkish Journal of Chemistry, 2007) Sayılkan, Funda; Asiltürk, Meltem; Şener, Şadiye; Erdemoğlu, Sema; Erdemoğlu, Murat; Sayılkan, HikmetHydrothermal synthesis, characterization and photocatalytic activity of nanosized TiO2 based catalysts for rhodamine B degradationÖğe New adsorbents from $Ti(OPr^n )_4$ by the sol-gel process: Synthesis, characterization and application for removing some heavy metal ions from aqueous solution(2004) Sayılkan, Funda; Sayılkan, Hikmet; Erdemoğlu, Sema; Şener, Şadiye; Akarsu, MuratNew adsorbents from Ti(OPrn)4 by the sol-gel process: Synthesis, characterization and application for removing some heavy metal ions from aqueous solutionÖğe New adsorbents from Ti(OPrn )_4 by the sol-gel process: Synthesis, characterization and application for removing some heavy metal ions from aqueous solution(Turkish Journal of Chemistry, 2004) Sayılkan, Funda; Sayılkan, Hikmet; Erdemoğlu, Sema; Şener, Şadiye; Akarsu, MuratNew adsorbents from Ti(OPrn)4 by the sol-gel process: Synthesis, characterization and application for removing some heavy metal ions from aqueous solution
