期刊
ENVIRONMENTAL RESEARCH
卷 198, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2020.110481
关键词
Activated carbon beads; Litsea glutinosa seeds; Adsorption; Methylene blue
资金
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [104.05-2019.03]
In this study, natural core-shell structure activated carbon beads (ACBs) from Litsea glutinosa seeds were successfully produced for adsorption of methylene blue (MB). The ACBs displayed highly porous natural core-shell spheres and showed a maximum adsorption capacity of 29.03 mg/g at optimal conditions. The primary contributions to the adsorption mechanism were identified as electrostatic attraction, pi-pi interaction, hydrogen bonding, and pore-filling.
In this study, natural core-shell structure activated carbon beads (ACBs) from Litsea glutinosa seeds were successfully produced, characterized, and applied for adsorption of methylene blue (MB). The ACBs were prepared using single-step carbonization-activation with NaHCO3 at the optimized activation temperature, time, and activating agent concentration of 450 degrees C, 60 min, and 5%, respectively. Batch experiments were performed to determine the optimum adsorption conditions, suitable kinetic and isotherm models, and thermodynamic parameters for the adsorption of MB onto ACBs. The results showed that the ACBs were displayed as highly porous natural core-shell spheres with a diameter of about 5 mm. The adsorption of MB dye on ACBs was a spontaneous endothermic process, followed the Langmuir isotherm and the pseudo-second-order kinetic models with the ratecontrolling step of both external diffusion and intra-particle diffusion. At the optimum conditions (pH of 9, the contact time of 10 h, the temperature of 40 degrees C, and an adsorbent dosage of 6 g/L), the maximum adsorption capacity reached 29.03 mg/g. The thermal method turned out to be more suitable for regenerating ACBs compared to the chemical method. The ACBs exhibited high reusability and stability, its adsorption efficiency could maintain more than 90% after five consecutive cycles of use. The electrostatic attraction, pi-pi interaction, hydrogen bonding, and pore-filling were identified as primary contributions to the adsorption mechanism. The overall results revealed that the ACBs could be used as a potential adsorbent for removing MB from water media.
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