Thermal characterization of methyltributylammonium-smectites

ÖNAL M., Sarikaya Y.

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, cilt.91, sa.3, ss.835-839, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 91 Sayı: 3
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1007/s10973-007-8456-2
  • Dergi Adı: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.835-839
  • Anahtar Kelimeler: activation energy, degradation, hydrophilic-hydrophobic characterization, intercalation, organosmectites, thermal analysis, CATION-EXCHANGE CAPACITY, POLYMER/LAYERED SILICATE NANOCOMPOSITES, CLAY-MINERALS, LAYER CHARGE, PHYSICOCHEMICAL PROPERTIES, QUATERNARY PHOSPHONIUM, METHYLENE-BLUE, SURFACE-AREA, MONTMORILLONITE, BENTONITE
  • Ankara Üniversitesi Adresli: Evet

Özet

A sodium smectite (NaS) with a cation exchange capacity (CEC) of 1.08 mol kg(-1) was intercalated with methyltributylammonium cation (MTBA(+)) with proportions equivalent to 0.2, 0.4, 0.6, 0.8 and 1.0 times the CEC. The contents of adsorbed water and intercalated MTBA+ in the prepared organosmectites (OSs) were determined by using the differential thermal analysis (DTA) and thermogravimetry (TG) curves. The adsorbed water of 8% in the NaS decreases greatly in OSs with the increase of the MTBA+ content and reduces to 2.0% for the 1.0 CEC sample. This explains the gradual change of the NaS from hydrophilic to hydrophobic character. Thermal degradation of the intercalated MTBA+ in OSs occurs approximately between 250-450 degrees C. The oxidation of the formed charcoal to CO2 occurs between 450-850 degrees C. The intercalated MTBA+ content for each OS is obtained from both the TG and carbon analysis. The results do not agree exactly, but both the results tend to increase by increasing initial content of the MTBA+ in solution.