"2"^^ . "3"^^ . . . "RIV/61989100:27360/09:00022145!RIV10-MSM-27360___" . "Protonated methylene blue; Intercalation; Montmorillonite"@en . . "978-80-8096-088-9" . "P(GA205/08/0869), Z(MSM6198910016)" . "Pustkov\u00E1, Petra" . "Slovensk\u00E1 technick\u00E1 univerzita v Bratislave" . "337316" . . . . "International doctoral seminar" . "[0AA16CAB1808]" . "Protonation of methylene blue and its intercalation into montmorillonite."@en . "The protonation of methylene blue (MB) was studied in variously acid aqueous solutions using Vis spectrophotometry. The cations of MB present in acid aqueous solutions, i.e. MB+, (MB+)n and MBH2+, were intercalated into Ca-montmorillonite (SAz-1). Adsorbed amounts of dye were evaluated by Vis spectrophotometry at two wavelengths; at 675 nm (monomeric form MB+) and at 748 nm (protonated form MBH2+). By this way two independent measurements of equilibrium dye concentration in acid aqueous solutions were obtained and used for the evaluation of the adsorbed amount of methylene blue into SAz-1. Adsorption curves determined in acid aqueous solutions consist of two separated steps whereas the adsorption curve determined in neutral aqueous solution has only one step. Intercalated MB/SAz-1 samples were studied using X-ray powder diffraction method and SEM. It was found that the first step of adsorption curve relates to ion exchange of MB cations with interlayer Ca2+ cations and the second one relates to MB ad" . . . . "Bratislava" . . "Dudov\u00E1, M." . "27360" . "2009-05-17+02:00"^^ . "The protonation of methylene blue (MB) was studied in variously acid aqueous solutions using Vis spectrophotometry. The cations of MB present in acid aqueous solutions, i.e. MB+, (MB+)n and MBH2+, were intercalated into Ca-montmorillonite (SAz-1). Adsorbed amounts of dye were evaluated by Vis spectrophotometry at two wavelengths; at 675 nm (monomeric form MB+) and at 748 nm (protonated form MBH2+). By this way two independent measurements of equilibrium dye concentration in acid aqueous solutions were obtained and used for the evaluation of the adsorbed amount of methylene blue into SAz-1. Adsorption curves determined in acid aqueous solutions consist of two separated steps whereas the adsorption curve determined in neutral aqueous solution has only one step. Intercalated MB/SAz-1 samples were studied using X-ray powder diffraction method and SEM. It was found that the first step of adsorption curve relates to ion exchange of MB cations with interlayer Ca2+ cations and the second one relates to MB ad"@en . "5"^^ . . . . . "RIV/61989100:27360/09:00022145" . "Protonation of methylene blue and its intercalation into montmorillonite."@en . "Smolenice" . . . "Klika, Zden\u011Bk" . "Protonation of methylene blue and its intercalation into montmorillonite." . "Protonation of methylene blue and its intercalation into montmorillonite." . . . .