OPTIMASI FOTOREAKTOR ZnO UNTUK DEGRADASI METILEN BIRU SECARA FOTOKATALISIS

ANSHEL AYMAR RAHMAN; EKO PRABOWO HADISANTOSO; RIZKA FITRIYANI S

Authors

ANSHEL AYMAR RAHMAN UIN Sunan Gunung Djati Bandung, Indonesia
EKO PRABOWO HADISANTOSO UIN Sunan Gunung Djati Bandung, Indonesia
RIZKA FITRIYANI S UIN Sunan Gunung Djati Bandung, Indonesia

Keywords:

metilen biru, fotokatalisis, fotodegradasi, fotoreaktor, ZnO

Abstract

Polusi air limbah pewarna, khususnya metilen biru (MB), merupakan masalah lingkungan karena senyawa tersebut relatif stabil dan sulit terurai secara biologis. Fotokatalisis menggunakan seng oksida (ZnO) merupakan pendekatan yang menjanjikan untuk mengurangi konsentrasi MB; namun, keefektifannya dipengaruhi oleh konfigurasi fotoreaktor dan kondisi pengoperasian. Penelitian ini bertujuan untuk menganalisis pengaruh jenis wadah reaksi, jarak sumber cahaya, pengoperasian pengaduk magnetik dan kipas pembuangan, serta suhu dan kehilangan volume, terhadap kinerja fotoreaktor dan untuk menentukan kondisi operasi yang optimal. Percobaan menggunakan 50 mL larutan MB 10 ppm dengan ZnO sebesar 1 g/L (0,05 g) di bawah lampu UV-A 365 nm selama 60 menit. Wadah reaksi yang digunakan bervariasi antara gelas kimia, botol vial, dan tabung reaksi, sedangkan jarak sumber cahaya bervariasi pada 5, 10, dan 15 cm dengan kondisi pengaduk magnetik dan kipas pembuangan dalam keadaan ON/OFF. Sampel diambil setiap 15 menit dan dianalisis menggunakan spektrofotometer UV-Vis pada panjang gelombang 664 nm. Kinerja fotokatalitik dievaluasi berdasarkan efisiensi degradasi, efisiensi penghilangan, rasio konsentrasi relatif (C/C₀), suhu, dan kehilangan volume. Hasil penelitian menunjukkan bahwa gelas kimia memberikan kinerja terbaik di antara wadah reaksi yang digunakan, sedangkan jarak 5 cm menghasilkan kinerja tertinggi di antara jarak-jarak yang diuji. Kondisi ON menghasilkan efektivitas yang lebih tinggi daripada kondisi OFF. Kondisi optimal diperoleh dengan menggunakan gelas kimia, jarak sumber cahaya 5 cm, serta pengaduk magnetik dan kipas pembuangan dalam kondisi ON, yang menghasilkan efisiensi degradasi sebesar 99,21%, efisiensi penghilangan sebesar 99,32%, dan C/C₀ sebesar 0,006778 setelah 60 menit.

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Author Biographies

ANSHEL AYMAR RAHMAN, UIN Sunan Gunung Djati Bandung

Program Studi Kimia, Fakultas Sains dan Teknologi

EKO PRABOWO HADISANTOSO, UIN Sunan Gunung Djati Bandung

Program Studi Kimia, Fakultas Sains dan Teknologi

RIZKA FITRIYANI S, UIN Sunan Gunung Djati Bandung

Program Studi Kimia, Fakultas Sains dan Teknologi

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