Akademik Veri Yönetim Sistemi
Sinop Üniversitesi Fen Bilimleri Dergisi, cilt.4, ss.37-46, 2019 (Hakemli Dergi)
Four well-known isotherm models were applied to investigate the adsorption process mechanism in the removal of radioactive 99mTcO4- from aqueous solution by using activated carbon as adsorbent. According to R2 values, the experimental data is found to be suitable for the four isotherm models. However, when the adsorption capacities of the experimental and isotherm models are compared, it was seen that the Langmuir (L) and Temkin (T) are best suited to the experimental data. The maximal monolayer adsorption capacity value founded from L isotherm model is 3170 μCi.g-1. The dimensionless separation factor (RL) value indicating a favorable adsorption experiment is 0.126. At the same time, the value of n obtained from F isotherm was found to be 1.72. Therefore, it can be said that active carbon is suitable for this adsorption process. The heat of adsorption process from T isotherm model was estimated to be 724 J/mol and the mean free energy from Dubinin-Radushkevic (D-R) isotherm model was estimated to be 13.4 J/mol. According to these data, it can be said that the adsorption process is realized by physical adsorption. The results showed that the activated carbon is a successful adsorbent for the removal of radioactive 99mTcO4- from aqueous solutions.