Organophilic clays and their application in atrazine adsorption
| Autor: | Fabricio Uliana, F. R. Valenzuela Diaz, F. S. D’Agostini Vazzoler, H. Vazzoler, E. A. Silva Filho |
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| Rok vydání: | 2021 |
| Předmět: |
Thermogravimetric analysis
Engineering (General). Civil engineering (General) surfactants chemistry.chemical_compound Adsorption chemistry Chemical engineering Bromide adsorption Specific surface area SURFACTANTES Ceramics and Composites Ammonium Lamellar structure Freundlich equation Atrazine organophilic clays TA1-2040 wastewater atrazine |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Cerâmica v.67 n.382 2021 Cerâmica (São Paulo. Online) Cerâmica, Volume: 67, Issue: 382, Pages: 158-163, Published: 17 MAY 2021 Cerâmica |
| Popis: | Atrazine’s adsorptive capabilities make the use of clays practical and effective. Three types of organophilic clays modified by cationic surfactants with the ability of one of these clays to adsorb atrazine in an aqueous medium are discussed in this work. The modification in clays was done with the surfactants cetyltrimethylammonium bromide, cetyltrimethylammonium chloride, and dodecyltrimethylammonium chloride. The X-ray diffraction data indicated different lamellar expansions for the three organophilic clays obtained when compared to in natura clay, proving the presence of quaternary ammonium salts in the interlamellar space. There was also a decrease in the specific surface area showing less accessibility to the lamellar spaces due to the presence of surfactants. The thermogravimetric analysis showed a negative variation profile in all the clays. The adsorption test showed a better capacity for atrazine adsorption in the organophilic clay of 64% when compared with 36% of in natura clay, and it followed the Freundlich isotherm model. |
| Databáze: | OpenAIRE |
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