Utilization as absorban of biochar made from red pine cones: Removal of Congo Red from aqueous solutions

Abstract

Congo Red, an anionic dyestuff, is used in many areas of industry today. Contact of anionic and cationic dyestuffs with water sources without cleaning causes serious environmental problems. In this study, red pine (Pinus brutia Ten.) cones, which can be found in many parts of the world, were turned into biochar (PBKB) and used for KR removal from aqueous solutions. In the results obtained, it was found that the removal of CR by PBKB was in accordance with the Langmuir adsorption isotherm (R2=0.975) and the maximum adsorption capacity value was 14.124 mg/g. As a result of the kinetic and thermodynamic calculations, it was concluded that the adsorption process is endothermic and proceeds over pseudo-second-order (PSO). PBKB was characterized by SEM-EDS and FT-IR devices before and after contact with the CR. When SEM-EDS characterization was performed before contact, it was calculated as the weight percentage (57.450%) and atomic percentage (66.540%) of element C and the weight percentage (34.310%) and atomic percentage (29.830%) of element O. Afterwards, the weight percentage (67.230%) and atomic percentage (75.400%) of element C and the weight percentage (26.110%) and atomic percentage (21.990%) of element O were calculated.

Keywords

• kızılçam kozalağı
• kongo kırmızısı
• adsorpsiyon
• langmuir
• red pine cone
• congo red
• adsorption
• langmuir