Proses kelompok telah digunakan untuk menyiasat penjerapan pewarna metilena biru (MB) dengan karbon teraktif berasaskan batang buluh (BBKK). Bagi menyediakan BBKK, batang buluh (BB) telah menjalani proses pengaktifan fizikal yang melibatkan penyinaran gelombang mikro dan pengegasan karbon dioksida (CO2). Berdasarkan kaedah permukaan respon, penyediaan optimum telah diperolehi pada kuasa gelombang mikro dan masa pengaktifan masing-masing pada 440 W dan 6.00 minit yang menghasilkan 88.27% penyingkiran MB. Sampel optimum ini mempunyai luas permukaan (636.48 m2/g), isipadu liang (0.4558 cm2/g) dan kandungan karbon tetap (75.34%) yang tinggi. Liang BBKK adalah jenis mesoliang dengan purata diameter liang 2.75nm. Kesan kepekatan awal pewarna (25-300 mg/L), masa sentuhan (0-24 jam) dan suhu larutan (30-60°C) turut dinilai. Data keseimbangan diperolehi bagi penjerapan oleh BBKK MB adalah terbaik dipadankan dengan model Langmuir yang mempunyai kapasiti penyerapan maksimum sehingga 222.22 mg/g. Sementara itu, data kinetik terbaik diwakili oleh model pseudo tertib kedua. Proses penjerapan MB ke BBKK adalah endotermik dan berlaku secara spontan.
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A batch process was used to investigate the adsorption of the methylene blue (MB) dye onto bamboo stem based activated carbon (BSAC). In order to prepare the BSAC, bamboo stem (BS) undergoes physical activation process which involves microwave irradiation and carbon dioxide (CO2) gasification. By using response surface methodology (RSM), the optimum preparation conditions were obtained at microwave power and activation time of 440 W and 6.00 minutes respectively which resulted 88.27% MB removal. The optimized sample has high surface area (636.48 m2/g), pore volume (0.4558 cm2/g) and fixed carbon content (75.34%). The pore of BSAC was mesoporous type with average pore diameter of 2.75nm. The effect of initial dye concentration (25-300 mg/L), contact time (0-24 hours) and solution temperature (30-60⁰C) were also evaluated through. The obtained equilibrium data for MB adsorption by BSAC dye was best fitted by Langmuir model with monolayer maximum adsorption capacity of 222.22 mg/g. Meanwhile, the kinetics data was best represented by the pseudo second-order model. The adsorption process of MB onto BSAC was endothermic and spontaneous process.
Preparation of activated carbon from bamboo stem using microwave irradiation for methylene blue dye removal from aqueous solution / Navenprasath Sandrasegaran