Katyon Değişim Reaksiyonu ile Organokil Sentezi ve Karakterizasyonu

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

Anahtar Kelimeler:

Montmorillonit, organokil, CTAB, d- aralığı

Synthesis and Characterization of Organoclay via Cation Exchange Reaction

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

Keywords:

Montmorillonite, organoclay, CTAB, d-spacing,

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