BENTONIT-Fe3O4 SEBAGAI FOTOKATALIS DALAM PROSES FOTODEGRADASI NAPHTHOL BLUE BLACK DENGAN IRADIASI UV

Abstract

Bentonit adalah salah satu jenis bahan yang umum.digunakan sebagai penyerap limbah zat warna. Namun, terdapat kesulitan dalam pemisahan dan pengumpulan kembali..adsorben setelah proses penyerapan. Oleh karena itu, dalam penelitian ini bentonit dijadikan komposit dengan oksida besi yang bersifat magnetik untuk mengatasi masalah tersebut. Penelitian ini bertujuan untuk mendegradasi zat warna Napthol blue black menggunakan bentonit-Fe3O4 bukan sekedar adsorben melainkan sebagai fotokatalis.. Penelitian ini.meliputi penentuan.massa bentonit-Fe3O4 optimum, pH optimum, waktu irradiasi optimum, serta..efektivitas.fotodegradasi..pada kondisi optimum...Hasil penelitian menunjukkan bahwa..kondisi..optimum..yang diperoleh yaitu massa bentonit-Fe3O4 sebesar 50 mg, pH. 5 dan waktu irradiasi dengan sinar UV adalah 30 menit. Persentase fotodegradasi pada kondisi optimum sebesar 98,95±0,01% yang menunjukkan fotodegradasi menggunakan fotokatalis bentonit-Fe3O4 sehingga fotodegradasi dengan fotokatalis yang disintesis ini sangat efektif...
 Kata kunci: fotodegradasi, katalis bentonit-Fe3O4, Napthol blue black

Titanium Dioxide (TiO2) Modified Bentonite for Photodegradation in Methylene Blue Dye

“…Based on Figure 3(a), bentonite particles have uniform morphologies, such as spherical, large flakes, layered structures [9], and irregular particle surfaces. These results are the same as those of previous research conducted by Suprihatin et al [6]. After modification with the TiO2 species shown in Figures 3(b) and 3(c), the bentonite surface changed, producing some small particles with a layered structure.…”

“…This phenomenon causes methylene blue to be adsorbed more effectively at acidic than alkaline pH. From the test results on ten catalysts, it can be concluded that the BT-10%, BT-20%, BT-30%, BT-40%, BT-50%, BT-60%, BT-70%, BT-80%, BT-90%, and BT-100% are active at an acidic pH of 1 [6].…”

“…The adsorption percentages of the ten consecutive catalysts were 99.68%, 99.87%, 99.64%, 99.78%, 99.45%, 99.55%, 99.63%, 97.85%, 99.57%, and 96.67%. Based on mass optimization data, a catalyst mass of 0.08 grams was chosen as the optimum mass because the percentage of photodegradation of methylene blue has been relatively constant [6]. It indicates that the more catalyst mass used, the better the methylene blue dye degrades.…”

“…The photodegradation method is effective because the dyes are broken down into simpler compounds and become harmless compounds such as H2O and CO2 [4]. The dye approaches the surface of the photocatalyst, which then undergoes degradation with the help of UV light [6].…”

“…Bentonite also has excellent adsorption properties, so the use of bentonite as a solid will facilitate and speed up the mass transfer process of the adsorbate. The contact between the photocatalyst metal oxide and organic compounds occurs more easily, and the reaction will occur more quickly [6].…”