Preparasi dan Karakterisasi Komposit TiO2/Metakaolin Teraktivasi KOH dalam Upaya Menurunkan Energi Celah Pita pada Anoda TiO2
DOI:
https://doi.org/10.26418/positron.v10i1.36703Keywords:
energi celah pita, metakaolin teraktivasi KOH, TiO2Abstract
TiO2 (titanium dioksida) merupakan satu di antara material semikonduktor yang banyak dipelajari karena sifat optik dan elektroniknya yang baik. Secara struktur, TiO2 mempunyai tiga fase kristal yaitu anatase, rutile, dan brookite. Dari ketiga fase tersebut, anatase lebih diminati untuk fotokatalisis. Namun, energi celah pita (band gap) dari fase ini (3,2 eV) sedikit lebih besar daripada fase rutile (3,0 eV) sehingga diperlukan perlakuan lebih lanjut untuk menurunkan energi celah pita material ini. Dalam penelitian ini, telah dilakukan sintesis komposit TiO2 dengan variasi penambahan metakaolin teraktivasi KOH (MK-OH) menggunakan metode sol-gel. Sifat fundamental yang meliputi gugus fungsi dan energi celah pita dari komposit TiO2/MK-OH juga dikaji. Berdasarkan hasil analisis X-Ray Diffraction (XRD) dan X-Ray Fluorescence (XRF) dari MK-OH yang digunakan dalam penelitian ini, diketahui adanya puncak difraksi pada 2 = (12,34o; 20,85o; 25,52o; 26,59o) yang menunjukkan kandungan mineral kaolinit dan kuarsa dengan rasio Si/Al sebesar 1,614. Hasil analisis Fourier Transform Infrared (FTIR) juga menunjukkan adanya puncak pada bilangan gelombang 686-700 (Si-O-Si); 946-947 (Si-O-Ti); 1630 (-OH); 3330 (-OH) cm-1. Selain itu, berdasarkan analisis Diffuse Reflectance "“ Ultraviolet (DR-UV) diketahui bahwa energi celah pita terendah dimiliki oleh komposisi 5% MK-OH sebesar 3,05 eV.
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