Evaluation of the adsorption capacity of <i>Cocos Nucifera</i> shell derived biochar for basic dyes sequestration from aqueous solution
Praveen Saravanan, Bhagavathi Pushpa Thillainayagam, Gokulan Ravindiran, J. Jegan
Abstract
The current study evaluates the adsorption capacity of Cocos Nucifera (Coconut) shell derived biochar for the basic dyes Basic Blue 41 (BB41) & Basic Red 09 (BR09) from aqueous solution. The adsorption experiments proved that 80% of dye removal was attained in the optimal operating conditions (adsorbent dosage of 4 g/L, pH of 8, temperature of 35°C, 50 mg/L of initial dye concentration). Four different isotherm models were used to derive the best fit isotherm model, based on the values of correlation coefficient and % of error BB41 sorption revealed that Toth model (R2 of 0.991 and % error of 0.010) has better fit, whereas the Sips model (R2 of 0.993 and % error of 0.529) was obtained as best fit for BR09 sorption when compared to other models. The regeneration studies were carried out with different elutants and the application of 0.1 M HCl as the elutant enables effective desorption of sorbent.