Adsorption and photophysical properties of fluorescent dyes over montmorillonite and saponite modified by surfactant

Abstract

In the present study, the adsorption capacities of two intercalated smectites, CTAB-saponite and CTAB-montmorillonite with a cationic surfactant, were investigated with three fluorescent dyes namely Rhodamine 640 perchlorate rhodamine (Rho), sulforhodamine B (SR) and Kiton red 620 (KR). The adsorption isotherms fit well with the non-linear Langmuir isotherm model and the maximum adsorption capacities of all the composites are determined. The photophysical properties such as anisotropy and fluorescence lifetime of all the fluorescent dyes over the clay materials are determined. The set of experimental data based on X-Ray diffraction (XRD), transmission electron microscopy (TEM), Thermal analysis (TG-DTA) and fluorescence measurements allow highlighting the presence or the absence of interactions between the dyes and the modified clay minerals.

Organophilic bentonites obtained by microwave heating as adsorbents for anionic dyes

“…Therefore, the obtained values were higher than 0.95 nm for all of the prepared organobentonites, indicating a bilayer arrangement of the alkyl ammonium cations with charged surfactant head groups disposed alternatively in the interlayer spacing of the montmorillonite. These present results are in agreement with other studies (Park et al, 2011;Daoudi et al, 2013;Sun et al, 2013;Tangaraj et al, 2017;Acisli et al, 2017).…”

“…Dyestuffs are important pollutants and many of them are non-biodegradable, being widely used in some industries, such as textiles, leather, pharmaceuticals, paper, among others (Tangaraj et al, 2017, Kausar et al, 2018. Reactive anionic dyes, such as Remazol blue RN, disodium 1-amino-9,10-dioxo-4-[3-(2sulfonatooxyethylsulfonyl)anthracene-2-sulfonate, have anthraquinone as a chromophore.…”

“…The net charge of the solid is changed and made more easily the interaction with negatively charged species (Ma et al, 2011;Tunç et al, 2012). Organobentonites have been applied for dye removal from aqueous solutions (Ma et al, 2011;Fan et al, 2014;Yan et al, 2015;Anirudhan et al, 2015;Tangaraj et al, 2017;Wang et al, 2017).…”

Organoclays used as colloidal and rheological additives in oil-based drilling fluids: An overview

“…Due to the exchangeable cations, organic cations can intercalate into the interlayer space (Bergaya and Lagaly, 2001;de Paiva et al, 2008;He et al, 2010He et al, , 2014Lagaly et al, 2013;Bardziński, 2014;Tangaraj et al, 2017), resulting in the expansion of interlayer space. Organic cations do not only intercalate into the interlayer space of Mt, but also coat on the surface (Juang et al, 2002;Hedley et al, 2007;Zhu et al, 2011;Zhuang et al, 2015aZhuang et al, , 2016, leading to the increase of the hydrophobicity.…”

Going through the wine fining: Intimate dialogue between organics and clays

“…The autoclaves were cooled to room temperature and the products were washed thoroughly with distilled water and centrifuged. The solids were then dried at 50 °C for 24 h [34,35].…”