Penjerapan pewarna malacit hijau (MH) dan remazol berkilau biru R (RBBR) telah diuji secara kelompok dengan menggunakan karbon teraktif berasaskan kulit buah salak (KTKBS). Kulit buah salak telah melalui proses pengaktifan fizikimia yang melibatkan enap jerap kalium hidroksida (KOH) dan penggasan karbon dioksida (CO2). Semasa proses penyediaan KTKBS, keadaan optimum telah diperoleh daripada kaedah sambutan permukaan (KSP). Keadaan optimum tersebut adalah suhu pengaktifan, masa pengaktifan dan nisbah KOH:arang, masing-masing pada 792°C, 1 jam dan 3:1 yang menghasilkan penyingkiran MH 81.74%, penyingkiran RBBR 63.97% dan hasilan KTKBS sebanyak 32.45%. KTKBS yang optimum mempunyai luas permukaan (968.32 m2/g), isi padu liang (0.503 cm3/g) dan karbon tetap (79.3%) yang tinggi. Liang KTKBS tergolong dalam kategori mesoliang dengan purata diameter liang 4.41 nm. Kesan kepekatan awal pewarna (100-500 mg/L), masa sentuhan (0–24 jam) dan suhu larutan (30-60oC) turut telah dinilai. Didapati bahawa model Langmuir adalah paling berpadanan untuk kedua-dua data garis sesuhu MH dan RBBR. Manakala, untuk analisa kinetik, didapati bahawa model pseudo-tertib-kedua dan pseudo-tertib-pertama adalah masing-masing paling sesuai digunakan untuk menentukan mekanisma penjerapan MH dan RBBR. Penjerapan MH dan RBBR yang diuji ke atas KTKBS adalah secara endotermik.
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The adsorption of malachite green (MG) and remazol brilliant blue R (RBBR) dyes onto salak peel activated carbon (SPAC) were investigated in a batch process. Salak peel undergoes physiochemical activation process which involves potassium hydroxide (KOH) impregnation and carbon dioxide (CO2) gasification. During the preparation of SPAC, the optimum preparation conditions were obtained from response surface methodology (RSM). The optimum conditions are activation temperature, activation time and KOH:char impregnation ratio (IR) with 792°C and 1 hours and 3:1 respectively, which has resulted in 81.74% MG removal, 63.97% RBBR removal and 32.45% SPAC yield. Optimized SPAC has high of surface area (968.32m2/g), pore volume (0.503 cm3/g) and fixed carbon content (79.3%). The pore of SPAC was mesoporous type with average pore diameter of 4.41 nm. The effect of initial dye concentration (100-500 mg/L), contact time (0–24 hours) and solution temperature (30-60oC) were also evaluated through. The obtained equilibrium data for both dyes were best fitted by Langmuir model. Meanwhile, the kinetics data were best represented by the pseudo second-order model for MG and pseudo-first-order model for RBBR. The adsorption process of MG and RBBR onto SPAC were endothermic in nature.
Dyes adsorption on salak peel based activated carbon optimization, equilibrium, kinetic and thermodynamic studies / Nur Izzatul Akmal Mohd Zaki