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Preparation of rice husk based activated carbon for the removal of malachite green and remazol brilliant violet 5r from aqueous solution

Preparation of rice husk based activated carbon for the removal of malachite green and remazol brilliant violet 5r from aqueous solution / Tay Lai Choo

Abstract Penjerapan pewarna melacit hijau (MH) dan remazol berkilau violet 5R (RBV5R) telah diuji secara kelompok dengan menggunakan karbon teraktif berasaskan sekam padi (KTSP). Sekam padi telah digunakan bagi menghasilkan KTSP melalui proses pengaktifan fizikimia yang melibatkan enap jerap kalium hidroksida (KOH) dan penggasan karbon dioksida (CO2). Semasa proses penyediaan KTSP, nisbah arang:KOH telah ditetapkan pada 1:1, suhu operasi pada 850oC dan masa pengaktifan selama 2 jam. Ciri-ciri KTSP seperti luas permukaan, permukaan morfologi dan kimia permukaan telah dikaji. Selepas itu, kesan kepekatan awal pewarna (100-500mg/L), masa penyentuhan (0–24 jam) dan suhu larutan (30-60oC) telah dinilai. Didapati bahawa model Langmuir adalah paling bersesuaian untuk kedua-dua data garis sesuhu MH dan RBV5R. Manakala, untuk analisa kinetik, didapati bahawa model pseudo-tertib-kedua dan pseudo-tertib-pertama adalah masing-masing paling sesuai digunakan untuk menentu mekanisma penjerapan MH dan RBV5R. _______________________________________________________________________________________________________ The adsorption of malachite green (MG) and remazol brilliant violet 5R (RBV5R) dyes onto rice husk based activated carbon (RHAC) was investigated in a batch process. Rice husk was used to prepare the RHAC through physiochemical activation which involves potassium hydroxide (KOH) impregnation and carbon dioxide (CO2) gasification. During the preparation of RHAC, the chemical impregnation, char:KOH ratio was set at 1:1; while the operating temperature was set at 850oC for 2 hours. RHAC was high in surface area (902.82m2/g) and pore volume (0.462cm3/g). The pore of RHAC was mesoporous type with average pore diameter of 2.41nm. The effect of initial dye concentration (100-500mg/L), contact time (0–24 hours) and solution temperature (30-60oC) were evaluated through batch adsorption test. 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 RBV5R.

Contributor(s): Tay Lai Choo - Author Primary Item Type: Final Year Project Identifiers: Accession Number : 875005159 Language: English Subject Keywords: adsorption; (MG); (RHAC) First presented to the public: 5/1/2013 Original Publication Date: 8/24/2020 Previously Published By: Universiti Sains Malaysia Place Of Publication: School of Chemical Engineering Citation: Extents: Number of Pages - 135 License Grantor / Date Granted:   / ( View License ) Date Deposited 2020-08-24 12:15:12.738 Submitter: Mohd Jasnizam Mohd Salleh

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