EVALUATION OF PHENOL ADSORPTION PROCESS ON BIOSORBENTS BY ISOTHERM, THERMODYNAMIC, AND KINETICS MODEL

• Main Author: Valentino Ananda Lim, Vincent
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/56216
• Institution: Institut Teknologi Bandung

The separation of phenols is an important step in the processing of food industry wastewater to avoid environmental pollution. One simple method that is potential to be applied is adsorption using waste of organic materials adsorbents, or biosorbents. Besides being able to overcome the environmental problems that it can cause, the use of biosorbents is also environmentally friendly. From previous studies, it has been proven that biosorbents is potential to be the raw material of adsorbents because of their high adsorption capacity. However, variability of the adsorption results using various biosorbent materials, under various operating conditions, causes the adsorption operation to be less optimal so that it has not been able to produce maximum phenol separation. This study aims to determine the phenomena that occur in the phenol adsorption process using various biosorbent materials, which are useful for the design of the adsorption process in the future. This research was conducted by gathering phenol adsorption operation data from literature studies and processing the data so that modeling could be made. The data modeling made is isotherm model, thermodynamic model, and kinetics model. Modeling is carried out with PlotDigitizer software, to digitize data from graphs in literature; and Microsoft Excel, to perform linear regression and parameter calculation of the modeling made. From the results of adsorption data modeling, it can be concluded that the mechanism in the phenol adsorption process with biosorbents is dominated by physical adsorption mechanism, with adsorption energy values ranging from 0.13 to 7.07 kJ/mol. Phenol adsorption process using biosorbents is a process that takes place exothermically with negative ?Ho, ranging from -86.13 to -33.28 kJ/mol; and tends to be spontaneous at lower temperatures, with ?Go increasing with increasing temperature. By 79% of the kinetics data is well fitted with pseudo second-order model, it is known that the rate-limiting step of adsorption is adsorption on the surface. Optimization of the phenol adsorption process with biosorbents can be done by pre-treatment process, such as carbonization and chemical activation, to increase the capacity of the biosorbent. This pre-treatment can modify the pore structure and the biosorbent surface, which play an important role in the physical adsorption process.