Widyani, Devi (2026) Analisis Pengaruh Konsentrasi Peroxymonosulfate (PMS) dan Rasio Massa Mn3O4/g-C3N4 dalam Peroxymonosulfate Activation Fenton-like degradation Methylene Blue Menggunakan Mn3O4/g-C3N4. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pencemaran perairan akibat limbah zat pewarna, khususnya Methylene Blue (MB), merupakan ancaman serius bagi ekosistem akuatik karena sifatnya yang toksik, karsinogenik, dan sulit terurai secara alami. Sehingga diperlukan metode pengolahan yang lebih efektif untuk mendegradasinya. Penelitian ini menerapkan sistem Fenton-like menggunakan komposit Mn3O4/g-C3N4 untuk mengaktivasi Peroxymonosulfate (PMS). Sistem Fenton-like ini dipilih karena memiliki keunggulan dibandingkan Fenton klasik, yaitu mampu beroperasi pada rentang pH yang lebih luas dan menghasilkan radikal sulfat (SO4−•) yang lebih stabil dengan potensial oksidasi tinggi. Mn3O4 dipilih sebagai katalis utama karena efektivitas variasi valensi mangannya yang tinggi untuk aktivasi PMS. Sementara itu, g-C3N4 berfungsi sebagai tempat penambatan Mn3O4 dan menyediakan luas permukaan besar bagi dispersi Mn3O4 agar tidak aglomerasi. Penelitian ini bertujuan untuk menentukan kondisi optimum degradasi MB dengan memvariasikan konsentrasi PMS, yaitu 0,1; 0,5; dan 1 mM serta variasi rasio massa Mn3O4 terhadap g-C3N4, yaitu 1:1, 3:1, dan 5:1. Proses sintesis g-C3N4 dilakukan dengan one-step calcination, sementara metode sintesis yang digunakan dalam sintesis Mn3O4 adalah co-precipitation dengan metode pengkompositan dengan g-C3N4 dilakukan secara in-situ. Melalui pengujian XRD, FTIR, dan SEM-EDX; komposit Mn3O4/g-C3N4 dikonfirmasi berhasil terbentuk. Dengan hasil pengujian BET berupa surface area untuk g-C3N4 dan Mn3O4/g-C3N4 variasi rasio massa 1:1 secara berturut-turut senilai 34,6289 m2/g dan 31,5646 m2/g. Pengujian Fenton-like degradation menggunakan UV-Vis mengkonfirmasi bahwa peningkatan nilai efisiensi degradasi terjadi seiring bertambahnya massa Mn3O4 terhadap g-C3N4 dan peningkatan konsentrasi PMS. Nilai efisiensi degradasi terbaik dimiliki oleh sampel Mn3O4/g-C3N4 variasi rasio massa 5:1 dan konsentrasi PMS 1 mM adalah 99,198% dengan durasi degradasi selama 4 menit.
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Aquatic pollution caused by dye waste, specifically Methylene Blue (MB), poses a serious threat to ecosystems due to its toxic, carcinogenic, and non-biodegradable. Consequently, more effective treatment methods are required to ensure its effective degradation. This study implements a Fenton-like system utilizing a Mn3O4/g-C3N4 composite to activate Peroxymonosulfate (PMS). The Fenton-like system offers significant advantages over the classical Fenton process, including the ability to operate across a broader pH range, the generation of stable sulfate radicals (SO4−•) with high oxidation potential. Mn3O4 was selected as the primary catalyst due to the high efficiency of its manganese valence variations in triggering PMS activation. Meanwhile, g-C3N4 serves as anchoring sites and provides high surface area to facilitate the dispersion of Mn3O4 nanoparticles and prevent agglomeration. This research aims to determine the optimum conditions for MB degradation by varying the PMS concentration (0,1; 0,5; and 1 mM) and the mass ratio of Mn3O4 to g-C3N4 (1:1, 3:1, and 5:1). The g-C3N4 was prepared via one-step calcination, while Mn3O4 was prepared via co-precipitation, followed by an in-situ compositing with g-C3N4. Through XRD, FTIR, and SEM-EDX analyses, the successful formation of the Mn3O4/g-C3N4 composite was confirmed. BET analysis revealed that the surface areas of g-C3N4 and Mn3O4/g-C3N4 (1:1) were 34.6289 m2/g and 31.5646 m2/g, respectively. Furthermore, UV-Vis evaluation of the Fenton-like degradation confirmed that the degradation efficiency improved with the increasing mass of Mn3O4 relative to g-C3N4 and higher PMS concentrations. The optimum degradation efficiency was achieved by the Mn3O4/g-C3N4 sample with a 5:1 mass ratio and a 1 mM PMS concentration, reaching 99.198% within a 4-minute degradation.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Fenton-like degradation, g-C3N4, Methylene Blue, Mn3O4, Peroxymonosulfate, Fenton-like degradation, g-C3N4, Methylene Blue, Mn3O4, Peroxymonosulfate |
| Subjects: | Q Science > QD Chemistry > QD501 Catalysis. Catalysts. T Technology > TD Environmental technology. Sanitary engineering > TD420 Water pollution |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Devi Widyani |
| Date Deposited: | 22 Jul 2026 08:00 |
| Last Modified: | 22 Jul 2026 08:00 |
| URI: | http://repository.its.ac.id/id/eprint/136346 |
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