Production and characterization of the solid product of coconut pyrolysis

In this present study, it aimed to characterize biomass and obtain charcoal by means of pyrolysis of Cocos nucifera L. from a fractional planning 2 4-1 to be used in the removal of methylene blue. The investigated effects were temperature of 500 and 550 °C, heating rate 10 and 20 °C/ min, gas flow 1 and 4 mL/ min, and time of 30 and 60 min. The biomass composition showed values ​​for cellulose 36%, hemicellosis 11.2%, lignin 32.1%, calorific value of 17.5 MJKg -1 , density 0.158 g / mL, carbon 45.1%, hydrogen 6.8%, oxygen 0.4%, and nitrogen 47.7%. The results indicate that among the investigated effects, only the temperature influenced the charcoal yield. The best yield was at 500 °C with a specific surface area of ​​30.3801m 2 / g, a maximum methylene blue adsorption capacity of 67.7%, and better fit to the Langmuir isotherm model with a correlation coefficient R 2 = 0.9804. Regarding thermal analysis, it was observed that above 250 °C lignocellulosic thermal decomposition begins. The charcoal presented uniform size and pores, which influenced the adsorptive process of removing methylene blue.