Modification of Wyoming Montmorillonite Surfaces Using a Cationic Surfactant

摘要: Surfaces of Wyoming SWy-2-Na-montmorillonite were modified using ultrasonic and hydrothermal methods through the intercalation adsorption cationic surfactant octadecyltrimethylammonium bromide (ODTMA). Changes in surfaces structure characterized X-ray diffraction (XRD), thermal analysis (TG), electron microscopy. The preparation method results a higher concentration within montmorillonite interlayer when compared with that from method. Three different molecular environments for surfactants surface-modified are proposed upon basis their decomposition temperatures. Both XRD patterns TEM images demonstrate contains superlayers. organoclays prepared at high concentrations show alternate basal spacings between neighboring layers. SEM modification reduces clay particle size aggregation. Organoclays low display curved flakes, whereas they become flat increasing intercalated surfactant. Novel surfactant-modified formation new nanophases potential removal organic impurities aqueous media.