Pengaktifan Kimia Berbantuan Gelombang Mikro Karbon Aktif dari Kulit Kacang dengan Waktu Pra-karbonisasi yang Berbeda

Awitdrus Awitdrus, Dewi Mulfida, Rakhmawati Farma, Saktioto Saktioto, Iwantono Iwantono


Karbon aktif berbahan dasar kulit kacang (Arachis hypogaea L) disintesis menggunakan metode pengaktifan kimia berbantuan gelombang mikro. Kulit kacang dipra-karbonisasi selama 2 jam, 3 jam dan 4 jam pada temperatur 200 oC. Pengaktifan kimia dilakukan menggunakan kalium hidroksida dengan rasio massa pra-karbonisasi dan kalium hidroksida adalah 2:1 selama 24 jam. Iradiasi gelombang mikro dilakukan pada daya keluaran 630 watt selama 20 menit. Sifat fisika karbon aktif dikarakterisasi menggunakan difraksi sinar-X untuk mengetahui struktur mikro, isoterma adsorpsi/desorpsi N2 untuk mengetahui parameter porositas, serta infra merah transformasi Fourier untuk mengetahui struktur rantai karbon aktif. Pola difraksi sinar-X menunjukkan bahwa semua karbon aktif memiliki struktur turbostratik yang ditandai dengan adanya puncak (002) dan (100). Luas permukaan dan volume pori karbon aktif tertinggi adalah 153 m2/g dan 0,064 cm3/g untuk karbon aktif dengan waktu pra-karbonisasi selama 2 jam. Struktur rantai karbon menunjukkan adanya  gugus fungsi P=O, C-O, C-C, C-H pada bilangan gelombang 1031 cm-1, 1609,67 cm-1, 2363,87 cm-1, dan 2867,31 cm-1.

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