Acasia pycnatha sawdust based biochar for the removal of methylene blue
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The adsorption of methylene blue (MB) using biochar was conducted using batch adsorption Process. Biochar was formed by pyrolysing of saw dust of the eucalyptus using a top lit up gasifier ELSA Biochar stove. Experiment were conducted to investigate the influence of various parameters on effect of varying pH, Biosorbent concentration, biosorbate concentration and contact time on dye adsorption. The results revealed that there was a general increase in sorption capacity for MB as pH, concentration of MB, concentration of Biosorbent were increased. Optimum conditions were pH 8, sorbent dosage of 2,5g and maximum adsorption capacity 58,696 mgg-1 of MB at an agitation speed of 125rpm experimental equilibrium data were analysed using the isotherms of Langmuir, Freundlich. The Langmuir isotherm showed a correlation coefficient R2 was 0,999. The Freundlich showed R2 of close to unit (1) and a value of n greater than 1 Adsorption process fitted well the Isotherm models i.e Langmuir and Freundlich. Experiment showed that sawdust biochar could be employed as a low cost alternative to purify water as dye adsorbent.