Assessment of activated carbon prepared from corncob by chemical activation with phosphoric acid

By G. O. El-sayed, M. Yehia, Amany A. Asaad. 2014

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Abstract Corncob, which is the main waste from corn agricultures in Egypt, has been used as a raw material for the preparation of different activated carbons. Activated carbons (ACs) were prepared by chemical activation with concentrated H 3 PO 4 acid; followed by pyrolysis at 400, 500 and 600 °C. Different ACs have been used for the removal of methylene blue (MB) dye from aqueous solutions. Batch adsorption experiments were performed as a function of initial dye concentration, contact time, adsorbent dose and pH. Adsorption data were modeled using the Langmuir and Freundlich adsorption isotherms. Adsorption of MB on AC1 ( R 2 =0.9868) and AC2 ( R 2 =0.9810) followed Langmuir model with maximum monolayer sorption capacity of 28.65 and 17.57 mg/g, respectively. Adsorption onto AC3 was better fitted to Freundlich isotherm model ( R 2 =0.9823).

Subfields: Analytical Chemistry, Organic Chemistry, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/c99818334eabff774adbc804e871f6bc77cb0689