Assessment and development of carbonaceous soot from wood burning process: adsorption, kinetics and thermodynamics study for Rhodamine B dye

Abstract

Carbon based materials have acquired pivotal importance in the recent era for the removal of pollutants from the effluents. In this study, wooden soot (WS) obtained from wood burning has been utilized as an adsorbent for the removal of Rhodamine B dye (RB). The adsorption of RB on WS was studied as function of the contact time, concentration, and temperature. The amount of dye adsorbed onto the WS increased with the increase in the contact time, concentration and temperature. The adsorption data fitted well in Langmuir and Freundlich models with comparatively greater R2 value for the Langmuir model. Adsorption data followed the pseudo second order kinetics. The uptake of dye by the adsorbent was 238 mg/g. The various Thermodynamic parameters such as ∆Ho­, ∆So and ∆Go were studied which indicated that the adsorption of RB on WS adsorbent remained a spontaneous endothermic process. The surface morphology was studied through FESEM before and after the adsorption of RB, which indicated accumulation of dye on to the small pores. The functional group analysis was performed through FT-IR which indicated a clear change at 2360 cm-1 after the adsorption which confirmed the adsorption phenomena. The pore size, pore volume and pore diameter were 47.44 m2/g, 0.07 cm3/g and 35.23 A0 respectively. This study will highly acknowledge the use of low cost adsorbent materials for the environmental remediation.