Humaira, Siti Syahda (2025) Sintesis Material Heterojunction Berbasis g-C3N4−Cu2O Sebagai Fotokatalis dalam Produksi Hidrogen dan Degradasi Metilen Biru. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Komposit g-C3N4−Cu2O membentuk heterojunction p-n dapat menjadi strategi yang menjanjikan untuk meningkatkan aktivitas fotokatalitik, akibat adanya peningkatan antarmuka antara Cu2O dan g-C3N4 serta dapat menekan rekombinasi muatan. Pada penelitian ini komposit material grafit karbon nitrida dan tembaga oksida (g-C3N4Cu2O) berhasil disiapkan melalui metode pencampuran padat dengan perbandingan jumlah massa Cu2O dan g-C3N4 (1:1, 1:2, 2:1) dalam komposit. Komposit tersebut diperoleh dengan menyiapkan g-C3N4 dari melamin melalui proses kalsinasi sederhana, diikuti dengan pembentukan tembaga oksida (Cu2O) dari CuSO45H2O dengan larutan NaOH sebagai agen pengendap dan asam askorbat sebagai agen pereduksi. Hasil komposit digunakan untuk produksi hidrogen dan degradasi metilen biru secara simultan. Komposit hasil sintesis dikarakterisasi dengan instrumen XRD, FTIR, FESEM-EDX, dan UV-DRS. Struktur kristal komposit menunjukkan adanya puncak g-C3N4 pada sudut (2θ) sebesar 27,12o dan Cu2O memiliki 5 puncak pada sudut (2θ) sebesar 32,5; 36,1; 42; 61,04; 73,18o. Pada komposit g-C3N4−Cu2O terdapat gugus fungsi Cu(I)—O, N—H, O—H, dan C—N pada rentang bilangan gelombang 500 - 4000 cm-1. Karakterisasi morfologi dan sebaran unsur semua komposit mengidentifikasi bahwa terdapat penempelan Cu2O pada g C3N4. Sifat optik material murni dan komposit dari hasil karakterisasi UV-DRS menunjukkan energi band gap Cu2O, g-C3N4, CG 1:1, CG 1:2, CG 2:1 masing-masing sebesar 1,97; 2,73; 1,77; 1,87; 1,79 eV. Berdasarkan uji hidrogen variasi CG 2:1 menunjukkan hasil tertinggi. Jumlah komposisi massa Cu2O yang lebih tinggi dibandingkan g-C3N4 akan meningkatkan hasil produksi hidrogen. Pada uji degradasi metilen biru variasi CG 1:2 menunjukkan hasil tertinggi. Hal ini mengindikasikan bahwa semakin banyak jumlah massa g-C3N4 dapat meningkatkan kemampuan degradasi metilen biru. Hasil uji trapping, membuktikan bahwa elektron (e-) dan hole (h+) merupakan spesi aktif utama yang berperan dalam proses fototakalitik produksi hidrogen serta degradasi metilen biru.
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g-C3N4−Cu2O composites forming p-n heterojunctions can be a promising strategy to increase photocatalytic activity, due to the increased interface between Cu2O and g-C3N4 and can suppress charge recombination. In this study, a composite of carbon nitride graphite and copper monoxide (g C3N4−Cu2O) material was successfully prepared through a solid mixing method with a comparison of the mass of Cu2O and g-C3N4 (1:1, 1:2, 2:1) in the composite. The composite was obtained by preparing g-C3N4 from melamine through a simple calcination process, followed by the formation of copper oxide (Cu2O) from CuSO45H2O with NaOH solution as a settling agent and ascorbic acid as a reducing agent. The composite results are used for hydrogen production and the degradation of methylene blue simultaneously. The composites of the synthesis were characterized by XRD, FTIR, FESEM-EDX, and UV-DRS instruments. The composite crystal structure shows the presence of a peak of g-C3N4 at an angle (2θ) of 27,12o and Cu2O has 5 peaks at angles (2θ) of 32,5; 36,1; 42; 61,04; 73,18o. In the g C3N4−Cu2O composite, there are Cu(I)—O, N—H, O—H, and C—N functional groups in the range of wave numbers 500 – 4000 cm-1. Morphological characterization and elemental distribution of all composites identified that there was Cu2O adhesion to the g-C3N4. The optical properties of pure and composite materials from the results of UV-DRS characterization showed that the band gap energies of Cu2O, g-C3N4, CG 1:1, CG 1:2, CG 2:1 were 1,97; 2,73; 1,77; 1,87; 1,79 eV, respectively. Based on the hydrogen test, the CG variation of 2:1 shows the highest results. A higher amount of Cu2O mass composition than g-C3N4 will increase hydrogen production. In the blue methylene degradation test, the CG variation of 1:2 showed the highest results. This indicates that the higher the amount of mass of g-C3N4 can increase the degradation ability of blue methylene. The results of the trapping test prove that electrons (e-) and holes (h+) are the main active specimens that play a role in the photocatalytic process of hydrogen production and the degradation of blue methylene.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | fotokatalisis, heterojungsi, hidrogen, komposit, metilen biru, composite, heterojunction, hydrogen, methylene blue, photocatalytic. |
| Subjects: | Q Science > QD Chemistry > QD716 Photocatalysis. |
| Divisions: | Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis |
| Depositing User: | Siti Syahda Humaira |
| Date Deposited: | 04 Feb 2025 01:23 |
| Last Modified: | 04 Feb 2025 01:23 |
| URI: | http://repository.its.ac.id/id/eprint/117998 |
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