Karbon teraktif kebiasaannya digunakan untuk memerangkap toksin dan bahan kimia. Ia dibuat dari pelbagai sumber. Dalam kajian yang lalu, didapati bahawa penghasilan karbon aktif dari sisa pertanian adalah salah satu cara mesra alam yang mampu mengubah bahan buangan menjadi produk berharga. Oleh itu, matlamat projek ini adalah untuk menyediakan karbon teraktif daripada kayu bakau menggunakan kaedah fizikimia. Karbon teraktif dicirikan oleh penganalisis termogravimetrik, Brunauer-Emmett-Teller dan penganalisis unsur. Penyejatan metil ungu karbon telah dinilai. Faktor-faktor yang berbeza yang mempengaruhi penjerapan metil ungu dikaji iaitu suhu pengaktifan (650 ℃, 750 ℃ dan 850 ℃) dan nisbah jerap isi dengan kalium hidroksida (1, 1.5 dan 2). Penyingkiran tertinggi metil violet diperolehi oleh karbon teraktif pada suhu pengaktifan 850 ℃ dan nisbah jerap isi dengan kalium hidroksida 1. Kajian mendapati bahawa AC850(1) memberikan luas permukaan tertinggi iaitu 852.1913 m3/g dan jumlah isipadu liang 0.44 cm3/g. Peratusan penyingkiran maksimum ditentukan pada kepekatan awal metil ungu 100 mg/L adalah 87.81%. Penjerapan metil ungu pada karbon teraktif berasaskan kayu bakau telah didapati mengikuti garis sesuhu Freundlich dan model kinetik pseudo tertib kedua. Hasil kajian penjerapan menunjukkan bahawa karbon teraktif yang disediakan dari kayu bakau adalah penjerap yang sesuai bagi penyingkiran metil violet daripada larutan akuas.
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Activated carbon is commonly used to trap toxins and chemicals. It is made from a variety of sources. In the past studies, it has been found that the production of activated carbon from agriculture waste is one of the most environment-friendly which transform waste into a valuable product. Thus, the objective of this project was to prepare activated carbons from mangrove timber using physiochemical method. The activated carbon were characterized by Thermogravimetric Analyzer, Brunauer-Emmett-Teller and Elemental Analyzer. The methyl violet adsorption of the prepared carbons were evaluated. The different factors affecting adsorption of methyl violet (MV) were studied which are the activation temperature (650℃, 750℃ and 850℃) and KOH impregnation ratio (1, 1.5 and 2). The highest methyl violet removal was obtained at activated carbon with parameter 850℃ of activation temperature and 1.0 of KOH impregnation ratio. It was observed that AC850(1) gives the highest surface area of 852.1913 m3/g and total volume pore of 0.44 cm3/g. The maximum removal percentage were determined at 100 mg/L initial methyl violet concentration at 87.81 %. The adsorption of methyl violet on mangrove based activated carbon was found to follow the Freundlich adsorption isotherm and pseudo second order kinetic model. The result of adsorption study showed that the activated carbon prepared from mangrove timber is a suitable adsorbent for methyl violet removal from aqueous solution.
Adsorption of methyl violet from aqueous solution by using activated carbon from mangrove timber via physiochemical method / Nawal Auni Abdul Rahman