Valorization of Spent Ground Coffee as Renewable Source to Methylene Blue Removal

This study aims to examine the possibility of valorizing natural coffee grounds, which are rich in cellulose and hemicellulose, as renewable sources of carbonaceous material for wastewater treatment in the textile dyeing industry. On average, in Algeria, coffee consumption is 15 grams per person and day, or around 4 kilos for a year. The waste generated from coffee used in this study shows approximately a high moisture content of between 50 and 85%. The calcined sorbent was synthesized, and the sorption parameters pH and dye concentration have been optimized for methylene blue (MB) dye. The adsorption isotherm and kinetic were studied to describe the equilibrium of methylene blue (MB) adsorption. The obtained sorption data for calcined coffee grounds show an adsorption capacity for Methylene Blue (MB) removal, about 5.34 mg g-1. To confirm the adsorbent performance, the results were compared with a commercial activated carbon (CAC). The Methylene Blue (MB) sorption is favored by the pseudo-second-order kinetic model. Fourier transform infrared spectroscopy (FT-IR) characterization was carried out before and after Methylene Blue dye (MB) sorption.