Prestasi karbon teraktif kulit parkia speciosa (KTKPS) sebagai penjerap dalam penyingkiran pewarna metilena biru (MB) melalui proses penjerapan telah dikaji dalam proses kelompok. KTKPS telah disediakan melalui proses pengaktifan fizikal yang melibatkan pengegasan karbon dioksida (CO2) di bawah penyinaran gelombang mikro. Semasa penyediaan KTKPS, syarat-syarat penyediaan optimum telah diperoleh daripada kaedah sambutan permukaan (KSP). Keadaan optimum yang diperoleh adalah kuasa radiasi dan masa pengaktifan dengan masing – masingnya sebanyak 557 W dan 8 minit, yang telah menyebabkan 80.35% penyingkiran MB dan hasilan KTKPS sebanyak 41.02%. KTKPS yang telah dioptimumkan mempunyai permukaan BET dan luas permukaan liang-meso yang tinggi sebanyak 625.41 m2/g dan 438.40 m2/g. Jumlah isipadu liang 0.375 cm3/g dan kandungan karbon tetap 64.79% telah diperolehi semasa penyediaan KTKPS. Liang KTKPS adalah jenis liang-meso dengan diameter liang 2.21 nm. Parameter seperti kepekatan awal pewarna (25 - 300 mg/L), masa sentuhan (0 - 24 jam) dan suhu larutan (30 - 60˚C) telah disiasat. Model Freundlich didapati sebagai model terbaik yang sepadan untuk data keseimbangan manakala model pseudo-kedua menunjukkan padanan yang baik kepada data kinetik. Proses ini didapati endotermik, physisorption dan spontan
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The performance of parkia speciosa peel activated carbon (PSPAC) as adsorbent in the removal of methylene blue dye (MB) by adsorption was studied in a batch process. PSPAC was prepared by physical activation process involving carbon dioxide (CO2) gasification under microwave irradiation. During the preparation of PSPAC, the optimum preparation conditions were obtained from response surface methodology (RSM). The optimum conditions are radiation power and activation time with 557 W and 8 minutes, respectively, which has resulted in 80.35% MB removal and 41.02% PSPAC yield. The optimized PSPAC has high BET and mesopore surface area of 625.41 m2/g and 438.40 m2/g, respectively. The pore volume of 0.375 cm3/g and fixed carbon content of 64.79% was obtained during preparation of PSPAC. The pore of PSPAC was mesoporous type with pore diameter of 2.21 nm. Parameters like initial dye concentration (25 – 300 ppm), contact time (0 – 24 hours) and solution temperature (30 - 60˚C) were investigated. Freundlich model was found as the best fitted model for the equilibrium data whereas pseudo-second-order model showed a good fitting to the kinetic data. The process was found to be endothermic, physisorption and spontaneous process.
parkia speciosa peel activated carbon (PSPAC); adsorbent in the removal of methylene blue dye (MB); physical activation process involving carbon dioxide (CO2)
Microwave-assisted activated carbon from parkia speciosa peel for methylene blue dye removal / Syahazmir Ahmad Shah