Fotodegradasi Metilen Biru Menggunakan Campuran Pasir Puya/TiO2
DOI:
https://doi.org/10.23887/jstundiksha.v13i2.81388Keywords:
Pasir puya, TiO2 , Fotokatalis, Matriks Fotokatalis, Metilen BiruAbstract
Pasir puya merupakan istilah yang dikenal untuk pasir yang bersumber dari sisa pertambangan emas yang dilakukan khususnya oleh masyarakat lokal Kalimantan, telah diketahui memiliki kandungan mineral yang berharga seperti ZrSiO4, FeTiO3, dan TiO2 yang belum dimanfaatkan. Target penelitian ini adalah memanfaatkan pasir puya sebagai matriks fotokatalis TiO2 yang dapat memperbaiki efisiensi katalitik TiO2. Penelitian ini bertujuan untuk menganalisis karakteristik serta aktivitas campuran pasir puya/TiO2 terhadap degradasi metilen biru dalam larutan berair. Campuran pasir puya/TiO2 disintesis melalui metode sol-gel kemudian dikarakterisasi menggunakan X-Ray Diffraction (XRD), analisis sorpsi gas (BET) dan Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX). Konsentrasi metilen biru diukur menggunakan spektrofotometer UV-Vis. Hasil analisis XRD mengkonfirmasi bahwa fase kristal TiO2 dalam campuran pasir puya/TiO2 yang telah disintesis adalah fase anatase pada 2θ 25,32o, 37,78o, 48,04o, 54o, 55,09o, dan 62,78o bersama dengan kristal zirkonium silikat pada 2θ 26,97o, 52,19o, dan 55,57o yang berasal dari pasir puya. Hasil analisa EDX menunjukkan bahwa campuran pasir puya/TiO2 mengandung unsur dominan O, Ti, dan Zr. Analisis gas sorpsi BET menunjukkan peningkatan luas permukaan pada campuran pasir puya/TiO2 lebih dari 10 kali lipat dibandingkan pasir puya. Kemampuan fotokatalitik optimum dalam mengurangi kadar metilen biru dalam larutan berair berdasarkan analisis statistik adalah campuran pasir puya/TiO2 5%, yang tidak berbeda signifikan dari campuran TiO2 dengan pasir puya 3% dan 1% namun berbeda dengan campuran dengan pasir puya 10%.
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