Eosin Removal by Cetyl Trimethylammonium-Cloisites: Influence of the Surfactant Solution Type and Regeneration Properties
| Autor: | Fahd Al Wadaani, Rawan Al-Faze, Souad Rakass, Hicham Oudghiri Hassani, Mostafa Abboudi, Fethi Kooli, Yan Liu, Sheikh Muhammad Ibrahim |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Thermogravimetric analysis
Magnetic Resonance Spectroscopy Nitrogen Pharmaceutical Science Salt (chemistry) 02 engineering and technology 010402 general chemistry 01 natural sciences Article Analytical Chemistry lcsh:QD241-441 chemistry.chemical_compound Surface-Active Agents Adsorption Pulmonary surfactant X-Ray Diffraction lcsh:Organic chemistry Drug Discovery Spectroscopy Fourier Transform Infrared Cation-exchange capacity Organoclay eosin dye Thermal stability organophilic clays Physical and Theoretical Chemistry Fluorescent Dyes chemistry.chemical_classification Eosin removal Organic Chemistry Temperature 021001 nanoscience & nanotechnology Carbon 0104 chemical sciences clay minerals chemistry Chemistry (miscellaneous) regeneration Thermogravimetry Cetrimonium Compounds Microscopy Electron Scanning Molecular Medicine Clay Eosine Yellowish-(YS) 0210 nano-technology Nuclear chemistry |
| Zdroj: | Molecules, Vol 24, Iss 16, p 3015 (2019) Molecules Volume 24 Issue 16 |
| ISSN: | 1420-3049 |
| Popis: | The effect of the counteranion of hexadecyltrimethylammonium salts on the physico-chemical properties of organoclays was investigated, using a selected natural clay mineral with a cation exchange capacity of 95 meq/100 g. The uptake amount of C16 cations was dependent on the hexadecyltrimethylammonium (C16) salt solution used, the organoclay prepared from C16Br salt solution exhibited a value of 1. 05 mmole/g higher than those prepared from C16Cl and C16OH salt solutions. The basal spacing of these organoclays was in the range of 1.81 nm to 2.10 nm, indicating a similar orientation of the intercalated surfactants, and could indicated that the excess amount of surfactants, above the cation exchange capacity of 0.95 meq/g could be adsorbed on the external surface of the clay mineral sheets. These organoclays were found to be stable in neutral, acidic, and basic media. The thermal stability of these organoclays was carried out using thermogravimetric analysis and in-situ X-ray diffraction (XRD) techniques. The decomposition of the surfactant occurred at a maximum temperature of 240 ° C, accompanied with a decrease of the basal spacing value close to 1.42 nm. The application of these organoclays was investigated to remove an acidic dye, eosin. The removal amount was related to the initial used concentrations, the amount of the surfactants contents, and to the preheated temperatures of the organoclays. The removal was found to be endothermic process with a maximum amount of 55 mg of eosin/g of organoclay. The value decreased to 25 mg/g, when the intercalated surfactants were decomposed. The reuse of these organoclays was limited to four regeneration recycles with a reduction of 20 to 30%. However, noticeable reduction between 35% to 50% of the initial efficiency, was achieved after the fifth cycle, depending of the used organoclays. |
| Databáze: | OpenAIRE |
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