Dalam kajian ini, tongkol jagung telah berjaya digunakan sebagai prekursor untuk persediaan karbon teraktif untuk menyingkirkan pewarna reaktif Brilliant Blue R (RBBR) daripada larutan akuas. Pengaktifan fisikimia terdiri daripada enap jerap natrium karbonat (Na2CO3) serta gasifikasi karbon dioksida telah digunakan untuk menyediakan karbon teraktif. Rekabentuk eksperimen menunjukkan bahawa suhu pengaktifan, masa pengaktifan dan nisbah enap jerap adalah faktor-faktor penting yang mempengaruhi penyingkiran RBBR dan hasil karbon teraktif. Berdasarkan Rekabentuk Komposit Tengah (RKT), dua model kuadratik untuk penyingkiran RBBR dan hasil karbon teraktif telah didapati. Keadaan optimum yang diperoleh selepas kajian ialah 723.98 ° C, 1.0 jam dan 1.0 masing-masing bagi suhu pengaktifan, masa pengaktifan dan nisbah enap jerap. Karbon teraktif yang dioptimumkan adalah bersifat liang meso. Analisis mikroskop elektron imbasan membuktikan karbon teraktif ini menunjukkan struktur liang yang homogen. Analisis inframerah pengubahan Fourier mengungkapkan kewujudan pelbagai kumpulan berfungsi atas permukaan karbon teraktif. Penjerapan pewarna RBBR meningkat dengan meningkatnya kepekatan awal dan masa tindakbalas. Selain itu, penjerapan keseimbangan RBBR dapat ditaksir dengan model Freundlich. Data kinetik kelompok adalah mengikut Pseudo-kinetik tertib kedua. Selain, resapan intrazarah bukan hanya kadar mekanisme bersempadan dalam proses itu. Kadar keseluruhan penjerapan telah dikawal oleh pemindahan jisim luar pada awal penjerapan.
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In this work, corncob was successfully used as precursor for preparation of activated carbon for the removal of Brilliant Blue R (RBBR) reactive dyes from the aqueous solution. Physiochemical activation consisting of sodium carbonate (Na2CO3) impregnation plus carbon dioxide gasification was used to prepare the activated carbon. The experimental design results revealed that activation temperature, activation time and impregnation ratio were important factors influencing RBBR removal and CCAC yield. Based on the Central Composite Design (CCD), two quadratic models were developed for RBBR removal and CCAC yield. The optimum conditions obtained were 723.98 °C, 1.0 h and 1.0 for activation temperature, activation time and IR respectively. The optimized activated carbon was mesoporous in nature. Scanning electron microscopy (SEM) analysis proves this activated carbon demonstrated homogeneous type pore structure. Fourier Transform Infrared analysis revealed the presence of various functional groups on the activated carbon surfaces. The RBBR dye adsorption uptakes increased with increasing initial concentration and contact time. Moreover, the RBBR adsorption equilibrium was built fitted by the Freundlich isotherm model. The kinetic batch kinetic data follow Pseudo-second order kinetic. Besides, intraparticle diffusion was not merely the rate limiting mechanism in the process. The overall rates of adsorption were found to be control by external mass transfer at the beginning of adsorption.
Synthesis of corncob based activated carbon for remazol brilliant blue r reactive dye removal Evelyn Tan Chai Yun_K4_2011_875003872_NI