The interaction of an azo compound with a surfactant and ion pair adsorption to solid phases

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• 作者：Ana Carolina Ribeiro Gomes ;   ; ^{carolina_arg@bol.com.br} ; Luciene Dias Fernandes Cafer ;   ; ^{ludiasf@gmail.com} ; Paula Homem-de-Mello ;   ; ^{paula.mello@ufabc.edu.br} ; Maurí ; cio Domingues Coutinho-Neto ;   ; ^{mauricio.neto@ufabc.edu.br} ; Ivanise Gaubeur  ; ;   ; ^{ivanise.gaubeur@ufabc.edu.br}
• 关键词：Azo dye ; Cationic surfactant ; Ion pair ; Molecular dynamics ; DFT ; ZIndo
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 出版时间：1 February 2012
• 年：2012
• 卷：367
• 期：1
• 页码：370-377
• 全文大小：590 K

文摘

The adsorption of SPADNS (trisodium salt of 2-(p-sulfophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid) onto resins XAD 2, XAD 7 and silica gel was studied in the presence and in the absence of the cationic surfactant CTAB (cetyl trimethylammonium bromide). At a ratio of 2.5 CTAB to 1 SPADNS, the surfactant caused a marked increase in SPADNS adsorption. The experimental results for adsorption versus time were applied on the basis of three kinetic models (pseudo-first-order Lagergren, pseudo-second-order, and intraparticle diffusion). The interaction between CTAB and SPADNS was investigated using spectrophotometric, conductometric, and computational techniques. Theoretical results point to the formation of an ion pair between CTAB and SPADNS that influences the solution spectra, in agreement with conductometric and spectrophotometric data.