Sintesis Granul TiO2-Bentonit/Alginat Untuk Fotodegradasi Metilen Biru

Authors

  • Antika Ratna Sari Brawijaya University
  • Sri Wardhani
  • Siti Mutrofin

Abstract

Penelitian ini bertujuan untuk sintesis fotokatalis TiO2-bentonit/Alginat granul,mengetahui pengaruh pengemban bentonit dalam fotokatalis, pengaruh konsenterasi TiO2 dalam bentonit, pengaruh lama penyinaran dan pengaruh pH terhadap degradasi metilen biru dengan menggunakan sinar UV panjang gelombang 365 nm. Sintesis fotokatalis dilakukan dengan impregnasi basah TiO2 dalam bentonit dengan komposisi konsenterasi TiO2 dalam bentonit  0,0075; 0,01; 0,0125; 0,015; 0,02; dan 0,025 mol/g bentonit. TiO2 dan TiO2-Bentonit dikarakterisasi menggunakan FTIR dan XRD. Variasi lama penyinaran yang digunakan adalah 20, 60, 100, 140, dan 180 menit. Variasi pH yang digunakan adalah pH 3, 5, 7, 9, dan 11. Volume, konsentrasi metilen biru, dan massa fotokatalis yang digunakan berturut-turut adalah 25 mL, 10 mg/L, dan 100 mg. Penentuan absorbansi metilen biru secara spektrofotometri UV-Vis pada panjang gelombang 664 nm. Hasil karakterisasi dengan FTIR menunjukkan munculnya vibrasi Ti-O-Ti pada bilangan gelombang 623,25 cm-1, 708,83 cm-1. Karakterisasi dengan XRD menunjukkan bahwa TiO2 mempunyai 2 fasa yaitu rutil dan anatase dengan komposisi 64,8% dan 35,2%. Berdasarkan analisis Match!3 bentonit merupakan fasa montmorillonit. Hasil fotodegradasi menunjukkan bahwa fotokatalis TiO2-Bentonit/Alginat memiliki persentase degradasi lebih baik dibandingkan TiO2/Alginat. Persentase degradasi optimum dicapai pada fotokatalis komposisi TiO2-bentonit  0,015 mol/ g bentonit,  lama penyinaran 100 menit dan pH 7 dengan degradasi sebesar 82,33%.

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Published

22-09-2021

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Vol. 10 No. 2 (2021)

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