• Sumontha Ramangkoon
  • Chalermpong Saenjum Department of Pharmaceutical Sciences, Faculty of Pharmacy, Chiang Mai University, Chiang Mai, Thailand
  • Busaban Sirithunyalug


Rice straw, Activated charcoal, Phosphoric acid


Objective: To determine optimal conditions required for activated charcoal production from rice straw with high quality for medical and pharmaceutical applications using chemical activation process.

Methods: Effects of different pretreatment protocols in 2-step H3PO4 activation of Thai rice straw on adsorption properties, pore structure, and surface chemistry were investigated. The rice straw was carbonized at 400 °C for 2 h. The obtained charcoal was then impregnated with 85% H3PO4 in the ratio of 1:4 w/v for 24 h, followed by carbonization at 500, 600 and 700 °C for 1 h.

Results: The results indicated that the 2-step H3PO4 activation, impregnating and carbonization at 700 °C was more efficient in producing activated charcoal because of showing the highest iodine adsorption (629 mg/g), methylene blue adsorption (198 mg/g) and Pb2+ions adsorption (64.19%). The adsorption capacity on iodine, methylene blue, and Pb2+ ions were compared. The results showed that rice straw activated charcoal was most efficient highest to adsorb Pb2+ ions. This adsorption capacity was higher than that of the commercial medical-grade activated charcoal.

Conclusion: The rice straw activated charcoal which was prepared by 2-step H3PO4 activation tends to be potential for medical and pharmaceutical applications.

Keywords: Rice straw, Activated charcoal, Phosphoric acid


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How to Cite

Ramangkoon, S., C. Saenjum, and B. Sirithunyalug. “PREPARATION OF RICE STRAW ACTIVATED CHARCOAL BY 2- STEP H3PO4 ACTIVATION”. International Journal of Pharmacy and Pharmaceutical Sciences, vol. 8, no. 4, Apr. 2016, pp. 218-21,



Original Article(s)