Sintesis Oksida Grafena Tereduksi (rGO) dari Arang Tempurung Kelapa (Cocos nucifera)

Abstract

Grafena merupakan satu lapis atom karbon yang memiliki hibridisasi sp2 membentuk struktur heksagonal dua dimensi. Grafena memiliki potensi yang sangat luas namun ketersediaannya masih terbatas. Penelitian ini bertujuan untuk mensintesis oksida grafena tereduksi (rGO) dari arang tempurung kelapa dengan menggunakan metode modifikasi Hummer. Modifikasi dilakukan dengan menghilangkan NaNO3. Sintesis dilakukan dengan ukuran partikel arang tempurung kelapa ~ 50 μm dan waktu oksidasi selama 5 hari. Analisis struktur rGO dilakukan dengan pengujian FTIR, UV-Vis dan difraksi sinar-X (XRD). Hasil pengujian FTIR menunjukkan adanya puncak pada panjang gelombang 1604,891 cm-1 dari ikatan C=C aromatik yang merupakan indikasi terbentuknya rGO. Hasil pengujian UV-Vis menunjukkan adanya serapan pada panjang gelombang 272 nm yang disebabkan oleh transisi π→π ⃰ dari ikatan C=C pada cincin aromatik. Pengujian XRD menghasilkan puncak difraktogram pada sudut 2θ ~ 24° yang khas untuk material rGO.

Synthesis of Graphene Oxide Enriched Natural Kaolinite Clay and Its Application For Biodiesel Production

“…This oxidation process aims to obtain oxidized graphite and produce intercalated graphite. This intercalation will increase the distance between the graphene layers and weaken the layers' interaction (Hidayat et al, 2019).…”

“…Potassium permanganate is one of the strong oxidizing agents, especially in an acidic atmosphere. The penetration of KMnO4 into the graphite layer is very effective for oxidizing graphite (Hidayat et al, 2019).…”

“…At the end of the process, the addition of H2O2 is carried out as an oxidizing agent and helped break bonds into one atomic layer. H2O2 playes a role in reducing permanganate residues after the reaction and stopping the reaction (Hidayat et al, 2019). The addition of H2O2 causes a change in the color of the mixture to be yellow with a slight green tint that indicates that there is still unreacted graphite.…”

“…GO is obtained from exfoliating graphite oxide using the sonication process. This peeling can occur due to the presence of ultrasonic waves (Hidayat et al, 2019). Ultrasonic waves have a frequency range of more than 20,000 Hz and include mechanical waves, so the process of peeling graphene oxide from graphite oxide is carried out mechanically.…”

“…The peeling process starts with the interaction between graphite oxide due to interaction with ultrasonic waves, which causes shear forces on graphite oxide. The pressure difference caused the cavitation process during sonication, which causes the initiation of the graphite oxide peeling process into graphene oxide (Hidayat et al, 2019). Black GO powder was obtained by drying sediment at 80ºC.…”