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Fixed-Bed Adsorption of Metanil Yellow from Aqueous Solution on HNO3-Treated-H3PO4-Activated Carbon from Gmelina Bark

Beniah O. Isiuku* and Calistus N. Nwosu

Department of Chemistry, Imo State University, Owerri, Nigeria

*Corresponding author: Tel: +234 8035731300; E-mail: obinnabisiuku@yahoo.com

Abstract

Fixed-bed adsorption studies were carried out to evaluate the efficiency of H3PO4-activated carbon treated with HNO3 as an adsorbent for the removal of metanil yellow from aqueous solution under the effects of varying influent concentrations, bed heights and volumetric flow rates at solution pH 3 and at 29 °C. Experimental data were fitted into Thomas and Yoon-Nelson models. Increase in adsorption capacity with increase in initial concentration (except 100 mg/L), increase in bed height and decrease in flow rate was observed. Optimum equilibrium adsorption capacity 19.93 mg/g for influent concentration 50 mg/L, bed height 4.15 cm and flow rate 6 mL/min was obtained. The linear regression coefficients R2 values of 0.6814 to 0.9627 for the Thomas and 0.7123 to 0.9664 for the Yoon-Nelson models showed both models fit in analyzing experimental data. The results show gmelina bark as a potential precursor for activated carbon production.

Keywords

Adsorption capacity, Carbon, Fixed-bed, Gmelina bark, Kinetic models, Metanil yellow.

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