Synthesis and Characterization of Organoclay via Cation Exchange Reaction

Öz

Montmorillonite has been subjected through cation-exchance reaction by cetyltrimethylammonium
bromide (CTAB) with general formula [CH3(CH2)15N(CH3)3Br]. The modifed samples were charecterized by X-ray
diffraction (XRD) technique, Fourier transform infrared (FTIR) spectroscopy. The results are supported by the
measurements of zeta potentials and contact angles of montmorillonite and organoclay samples. The basal spacing
of unmodifed montmorillonite, determined by XRD, was 1.28 nm and after modifcation it increased up to 1.75
nm, 2.03 nm and 2.56 nm for 1.3 CEC, 2.56 CEC and 3.85 CEC respectively. The FTIR studies revealed structural
differences between the modifed and unmodifed montmorillonite samples. The zeta potential measurements
showed that of the clay surface charge shift from negative to positive value. Contact angle measurements have
shown a reduction of the clay hydrophility after the modifcation

Anahtar Kelimeler

• Montmorillonite,organoclay,CTAB,d-spacing

Katyon Değişim Reaksiyonu ile Organokil Sentezi ve Karakterizasyonu

Öz

Montmorillonit, [CH3(CH2)15N(CH3)3Br] genel formüllü setil trimetil amonyum bromürle katyon-değişim
reaksiyonuna tabi tutulmuştur. Modifye örnekler X-ray difraksiyon (XRD) tekniği ve Fourier dönüşümlü infrared
(FTIR) spektroskopisi ile karakterize edilmiştir. Sonuçlar montmorillonit ve organokil örneklerinin zeta potansiyeli
ve temas açısı ölçümleriyle desteklenmiştir. Modifye edilmemiş montmorillonitin bazal mesafesi XRD ile 1.28
nm olarak belirlenmiştir ve modifkasyondan sonra 1.3 KDK, 2.56 KDK ve 3.85 KDK için bu değer sırasıyla 1.75
nm, 2.03 nm ve 2.56 nm’ye artmıştır. FTIR çalışmaları modifye edilmiş ve modifye edilmemiş montmorillonit
örnekleri arasındaki yapısal farklılıkları ortaya koymuştur. Zeta potansiyeli ölçümleri kil yüzey yükünün negatiften
pozitif değerlere kaydığını göstermiştir. Temas açısı ölçümleri modifkasyondan sonra kilin hidroflitesinde bir
azalma olduğunu göstermiştir .

Anahtar Kelimeler

• Montmorillonit,organokil,CTAB,d- aralığı

Kaynakça

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