Silanization of sepiolite with various silane coupling agents for enhancing oil uptake capacity

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Abali S., AYDIN Y. A.

Separation Science and Technology (Philadelphia), cilt.58, sa.3, ss.586-597, 2023 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 58 Sayı: 3
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1080/01496395.2022.2138434
  • Dergi Adı: Separation Science and Technology (Philadelphia)
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Analytical Abstracts, Applied Science & Technology Source, Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, Food Science & Technology Abstracts, INSPEC, Metadex, Pollution Abstracts, DIALNET, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.586-597
  • Anahtar Kelimeler: (3-aminopropyl)triethoxysilane, (3-glycidyloxypropyl)trimethoxysilane, oil absorption, Sepiolite silanization, trimethoxy(octadecyl)silane
  • Marmara Üniversitesi Adresli: Evet

Özet

Eskisehir sepiolite (SEP) was given a hydrophobic surface through acid treatment followed by silanization. The silanization process was realized with trimethoxy(octadecyl)silane (TMODS), (3-aminopropyl)triethoxysilane (APTES) and (3-glycidyloxypropyl)trimethoxysilane (GPTMS) coupling agents. The effects of temperature and reaction time on the silanization degree were studied within the ranges 25–50°C and 2–48 h, respectively. The efficiency of silanized SEP as an oil absorbent was investigated in pure olive oil media. The structural changes in sepiolite samples were monitored by X-ray diffraction (×RD), N2 adsorption (BET), scanning electron microscopy (SEM), thermal gravimetric analysis (TGA), and Fourier Transform Infrared spectroscopy (FTIR). Accordingly, maximum organic loading was achieved as 20.6% (w.) corresponding to 0.69 mmol silane/g SEP, when silanization was conducted with TMODS at 50°C for 24 h. Acid activation with hydrochloric acid removed the dolomite fraction and thus was in favor of silanization. The oil uptake capacities followed the order: GPTMS modified acid-activated SEP > APTES modified acid-activated SEP> TMODS modified acid-activated SEP > acid-activated SEP > SEP reaching as high as 2.77 ± 0.01 g/g at utmost. The augmentation in oil uptake capacity was not solely related to increased hydrophobicity, but also to altered surface area and porosity. Absorbed oil was recoverable at nearly 90% after three absorption–desorption cycles.