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In this study, rice husk was used as a precursor to prepare activated carbon using steam as a physical activation agent. Steam can be used to activate for almost all raw materials. This activation method was followed of the initial carbonization step. The study also investigated the effects of preparation parameters on the adsorption capacity of iodine (I) and methylene blue (MB). These parameters included the range of temperature and time in the carbonization and activation. | Vietnam Journal of Science and Technology 55 (4) (2017) 485-493 DOI: 10.15625/2525-2518/55/4/9216 EFFECT OF THE CARBONIZATION AND ACTIVATION PROCESSES ON THE ADSORPTION CAPACITY OF RICE HUSK ACTIVATED CARBON Hoa Thai Ma1,2, Van Thi Thanh Ho3, Nguyen Bao Pham2, Dat Chi Nguyen1, Kieu Thi Diem Vo4, Hung Cam Ly3, Tuan Dinh Phan3, * 1 2 Ho Chi Minh City University of Technology - Vietnam National University, 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City Tra Vinh University, 126 Nguyen Thien Thanh Street, Ward 5, Tra Vinh City 3 4 Ho Chi Minh City University of Natural Resources and Environment, 236B Le Van Sy street, District Tan Binh, Ho Chi Minh City Dong Nai Technology University, Nguyen Khuyen Street, Ward Trang Dai, Bien Hoa city * Email: pdtuan@hcmunre.edu.vn Received: 3 January 2017; Accepted for publication: 28 June 2017 ABSTRACT In this study, rice husk was used as a precursor to prepare activated carbon using steam as a physical activation agent. Steam can be used to activate for almost all raw materials. This activation method was followed of the initial carbonization step. The study also investigated the effects of preparation parameters on the adsorption capacity of iodine (I) and methylene blue (MB). These parameters included the range of temperature and time in the carbonization and activation. The initial carbonization, done at temperatures up to 500°C in 60 min., was a highly exothermic process where the temperature was strictly controlled. The creation of the internal surface was done during the activation step with steam at temperatures 800 °C in 30 min., for which the BET (Brunauer, Emmett and Teller) specific surface area was up to 710.8 m2/g. Besides, the I and MB adsorption capacity of the activated carbon were the best that reached 866.0 ± 6.5 and 217.9 ± 1.0 mg/g, respectively, while the I and MB adsorption capacity of carbonization step only reached 311.7 ± 3.4 and 28.7 ± 0.8 mg/g, respectively. The entire synthetic .
