Karbon teraktif telah dibuktikan sebagai efektif penjerap untuk menyingkirkan pewarna daripada proses kumbahan. Namun, karbon teraktif komersial adalah sangat mahal disebabkan oleh penggunaan bahan mentah yang tidak boleh diperbaharui. Oleh itu, tujuan kajian ini adalah untuk meghasilkan karbon teraktif daripada rotan dengan menggunakan induksi gelombang pengaktifan kalium hidroksida. Eksperimen telah diadakan untuk menilai pengaruh parameter gelombang seperti kekuatan radiasi, masa radiasi, dan nisbah impregnasi ke atas pengaktifan karbon teraktif. Rotan telah dikarbonisasikan pada suhu 750 oC selama dua jam dengan gas nitrogen berterusan diikuti dengan pengaktifan karbon teraktif. Selain itu, potensi penjerapan daripada metilen biru ke atas karbon teraktif rotan akan dinilai daripada pelbagai kepekatan awal pewarna masa sentuh, suhu larutan dan pH larutan melalui kajian penjerapan kelompok. Kualiti karbon teraktif rotan terbaik dihasilkan dengan nisbah impregnasi 1:1.25, kekuatan radiasi 600 W, dan masa radiasi 8 minit. Didapati bahawa penyingkiran metilan biru akan meningkat dengan peningkatan suhu larutan pewarna dan pH. Penyingkiran metilan biru akan menurun dengan peningkatan kepekatan awal larutan. Keputusan model penjerapan garis sesuhu yang lebih sesuai adalah Langmuir untuk penjerapan metilena biru ke atas karbon teraktif rotan dibandingkan dengan Freundlich. Model kinetik pseudo tertib terdua adalah lebih sesuai untuk penjerapan kinetic metilena biru ke atas karbon teraktif biru. Kapasiti penjerapan maksimum untuk karbon teraktif rotan ialah 222.22 mg/g. Selain itu, permukaan morfologi arang rotan dan karbon teraktif rotan telan diperiksa dengan mikroskop electron imbasan (SEM). Maksimum permukaan BET diperolehi ialah 816.0721 m2/g. Fourier penjelmaan infra merah kespektroskopan (FTIR) telah pun dilakukan untuk megkaji permukaan kimia karbon teraktif rotan sebelum dan selepas process penjerapan.
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Activated carbon adsorption has been proven to be an effective adsorbent in removing dyes from effluent processes. However, commercial available activated carbon is very expensive due to the use of non-renewable feedstock. Therefore, the purpose of this work is to produce rattan activated carbon by microwave-induced potassium hydroxide (KOH) activation. Experiments were conducted to investigate the influence of various microwave parameters such as impregnation ratio, radiation power and radiation time on rattan activated carbon activation. Raw material was carbonized at the temperature if 750 oC for 2 hours under nitrogen flow, followed by activated carbon activation. In addition, the potential adsorption of rattan activated carbon for methylene blue at different contact time and initial dye solution concentrations, solution temperature and initial solution pH are evaluated through batch adsorption studies. The best quality of rattan activated carbon was obtained at KOH/carbon ration of 1:1.25, radiation power of 600 W, and radiation time of 8 minutes. It was found that methylene blue removal will be increased with increasing dye solution temperature and pH. Methylene blue removal percentage will be decreased with increasing initial dye solution concentrations. Adsorption isotherms results fit very well in Langmuir isotherm for methylene blue adsorption onto rattan activated carbon compared to Freundlich isotherm. The rate of adsorption shows that the pseudo-second-order rate fitted the adsorption kinetics better than the pseudo-first-order rate equation. The maximum adsorption capacity of carbon produced from rattan was found to be 222.22 mg/g for the methylene blue dye. In addition, the surface morphology rattan char and rattan activated carbon were examined using scanning electron microscopy (SEM). The maximum BET surface area obtained was 816.0721 m2/g. Fourier transform infrared spectroscopy (FTIR) was conducted to study the surface chemistry of the activated carbon before and after adsorption.
Adsorption of methylene blue onto rattan activated carbon prepared by microwave induced pottasium hydroxide activation_Tan Bin Bin_K4_2011_875003879_NI