Penjerapan metilena biru (MB) oleh karbon teraktif berasaskan kulit buah markisah (KTKBM) telah dikaji dalam proses kelompok. Kulit buah markisah (KBM) telah menjalani proses pengaktifan fizikal yang melibatkan penyinaran gelombang mikro dan penggasan karbon dioksida (CO2) bagi menghasilkan KTKBM. Keadaan penyediaan optimum didapati pada kuasa sinaran dan masa pengaktifan masing-masing pada 616 W dan 7.75 minit, yang menghasilkan penyingkiran MB sebanyak 85.66% dan hasilan KTKBM sebanyak 39.99%. KTKBM yang optimum mempunyai luas permukaan (782.30m2/g), isi padu liang (0.422cm3/g) dan kerbon tetap (78.16%) yang tinggi. Liang KTKBM tergolong dalam kategori mesoliang dengan purata diameter liang 2.95 nm. Kesan kepekatan awal pewarna (25-300mg/L), masa sentuhan (0-24 jam) dan suhu larutan (30-60⁰C) turut telah dinilai. Didapati bahawa model Freundlich adalah paling berpadanan untuk data garis sesuhu MB. Manakala, untuk analisa kinetik, didapati bahawa model pseudo-tertib-kedua adalah paling sesuai digunakan untuk menentukan mekanisma penjerapan MB. Penjerapan MB yang diuji ke atas KTKBM adalah secara endotermik dan proses spontan.
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The adsorption of methylene blue (MB) dye onto passion fruit peel activated carbon (PFPAC) were investigated in a batch process. Passion fruit peel (PFP) undergoes physical activation process which involves microwave irradiation and carbon dioxide (CO2) gasification to prepare PFPAC. The optimum preparation conditions were obtained from response surface methodology (RSM) at radiation power and activation time of 616 W and 7.75 minutes, respectively which have resulted in 85.66% MB removal and 39.99% PFPAC yield. Optimized PFPAC has high of surface area (782.30m2/g), pore volume (0.422cm3/g) and fixed carbon content (78.16%). The pore of PFPAC was mesoporous type with average pore diameter of 2.95 nm. The effect of initial dye concentration (25-300mg/L), contact time (0-24 hours) and solution temperature (30-60⁰C) were also evaluated through. The obtained equilibrium data for MB dye was best fitted by Freundlich model. Meanwhile, the kinetics data was best represented by the pseudo second-order model. The adsorption process of MB onto PFPAC was endothermic in nature and spontaneous process.
Application of passion fruit peel based activated carbon by microwave activation for methylene blue dye removal / Muhammad Aswar Md. Eusoff