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|Title:||Dye adsorption using low cost carbon adsorbent from agrowaste-pearl millet cob husk|
|Keywords:||Single step activation;Adsorption isotherms;Adsorption kinetics;Millet cob husk;Regeneration|
|Abstract:||Activated carbon (MHAC) has been derived from the millet cob husk in a single step activation at a temperature of 600oC, impregnation ratio of 2:1 and residence time of 120 min. The Brunauer–Emmett–Teller (BET) surface area of the MHAC is 1342 m2/g and the scanning electron microscopy (SEM) images and Fourier-transform infrared spectroscopy (FT-IR) are similar to commercial activated carbon. The dye removal performance of the generated carbon has been investigated using methylene blue (MB) using following parameters; contact time, initial concentration of MB, pH and temperature. Langmuir, Freundlich, Temkin and Dubinin–Radushkevich (D-R) adsorption isotherms and three kinetic models have been studied. The adsorption equilibrium data is best fitted to Langmuir isotherm with R2 value of 0.972 .The adsorption kinetics show that pseudo-second-order kinetic model fits better with the experimental data of MB adsorption by MHAC than pseudo-first-order kinetic model. Regeneration of the carbon has been carried out for five cycles and 85.34 % MB could be adsorbed by the spent carbon, after fifth cycle.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.26(1) [January 2019]|
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