| Title: |
Humic acids elimination from aqueous media utilizing derived activated carbon from raw maize tassel on equilibrium, thermodynamic and kinetics. |
| Authors: |
Ebrahimi, Mahboube; Bagheri, Saideh; Taleghani, Maryam Maleki; Ghorabani, Majid |
| Source: |
Desalination & Water Treatment; Aug2019, Vol. 160, p250-259, 10p |
| Subject Terms: |
ACTIVATED carbon; HUMIC acid; FOURIER transform infrared spectroscopy; PHYSISORPTION; KINETIC control |
| Abstract: |
In this paper activated carbon which was prepared from maize tassel was utilized to eliminate humic acids (HAs) from aqueous solutions. Fourier transform infrared spectroscopy and X-ray diffraction were employed to characterize the activated carbon. Batch adsorption technique was utilized to investigate on the elimination of humic acids (HAs) by the generated adsorbent. Additionally, all parameters affecting the elimination efficiency like pH, dose of adsorbent, and initial humic acids (HAs) concentration were taken into consideration. Under optimum conditions, diverse isotherm models were examined to fit the experimental equilibrium data. The appropriateness and applicability of Langmuir model was confirmed by the obtained results. Kinetic models including pseudo- first-order and pseudo-second-order diffusion models confirmed that the second-order equation model controls the kinetic of the adsorption process. Also, evaluation of thermodynamic parameters of adsorption process (△G°, △H°, △S°) revealed little information. The negative △G° value revealed that the process is practicable and adsorption spontaneous in nature. The exothermic nature of adsorption was revealed by the negative ΔH° value. And finally the value of ΔS° revealed the change in the randomness of the active carbon from raw maize tassel solution interface during the sorption. The whole adsorption process was exothermic and spontaneous in nature. The outcomes demonstrated that HAs adsorption onto maize tassel might be a physical adsorption. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |