Enhancing methyl violet adsorption on sugarcane bagasse-based biochar via modification with sodium dodecyl sulfate

In this study, sugarcane bagasse was pyrolyzed at 600 oC in N2 to generate biochar following by modification with sodium dodecyl sulfate (SDS) solution. The adsorption ability of both biochar and SDS modified biochar was examined with methyl violet. Adsorption experiments were conducted with dye solution having a different concentration at the adsorbent dose of 5 g/L. Obtained results indicated that the removal efficiency of biochar increased from 64.30% to 97.54% as the concentration of SDS modifying solution increased from 0 to 0.4 g/L, respectively. The adsorption on biochar and modified biochar fits well to Langmuir model. The maximum adsorption capacity of biochar without modification was 10.58 mg/g, but increased 14.68 mg/g after being modifying with SDS solution 0.3 g/L. The adsorption fitted well to pseudo second order kinetic model with rate constants of 0.077 and 0.161 (g/mg·min) The success of study demonstrated that the dye adsorption on sugarcane bagasse-based biochar can be significantly improved by treatment biochar with SDS solution. This suggests a facile and cost-effective way to modify biochar for dye adsorption.