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Preparation and Characterization of Activated Carbon from Lapsi (Choerospondias axillaris) Seed Stone by Chemical Activation with Phosphoric acid

Author Affiliations

  • 1 Department of Engineering Science and Humanities, Institute of Engineering, Tribhuvan University, NEPAL
  • 2 Central Department of Chemistry, Tribhuvan University, NEPAL

Res.J.chem.sci., Volume 2, Issue (10), Pages 80-86, October,18 (2012)


Activated carbon was prepared from Lapsi seed stone by chemical activation with phosphoric acid at 4000 C. pH of point of zero charge (pHpzc), iodine number, proximate analysis and concentration of surface oxygen functional groups of activated carbon was determined by Boehm titration. The adsorption of methylene blue by thus prepared activated carbon was analyzed by the Langmuir and Freundlich adsorption isotherms. The data fitted well to the Langmuir isotherm with monolayer adsorption capacity 277 mg/g. Thermogravimetric analysis and proximate analysis of Lapsi seed stone was also carried out. The analysis showed that the activated carbon derived from Lapsi seed stone activated with phosphoric acid is comparable with commercial activated carbon and can be used as a potential adsorbent.


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