Preparing the material from the coconut trunk (Cocos nucifera L.) to adsorb congo red in aqueous

Abstract

In this study, coconut trunks were used to prepare the materials. Material characteristics, such as surface area, structure, and morphology, were determined using BET, XRD, FT-IR, and SEM methods. BET results showed that when coconut tree powder is heated at high temperatures, organic compounds decompose, creating many pores, increasing the surface area (the sample heated at 900 ^oC has a specific surface area of ​​535.156 m²/g). The material's morphological structure through SEM images showed that the material surface is rough, with many voids and cubic shapes, so that the Congo Red molecules can be adsorbed on the material’s surface. The adsorption capacity (q_e) survey reached the highest value of 57.92 mg/g at a concentration of 135 ppm, the q_max value was 65.7895 (mg/g), the K_L constant was 0.383 (l/mg) with the correlation coefficient R² of 0.9987, the Congo red adsorption isotherm on the material followed the Langmuir isotherm model, the adsorption kinetics followed the pseudo-second-order kinetic equation.