『Abstract
Phosphate removal from water is crucial to the prevention of
eutrophication. The phosphate adsorption performance from aqueous
solutions by using lanthanum-doped activated carbon fiber (ACF-La)
was developed by batch and continuous column adsorption method.
The batch sorption condition with respect to interfering ions
was tested, and the pseudo second-order and intraparticle diffusion
models were used to evaluate the adsorption kinetics of phosphate
onto ACF-La in the presence of interfering ions, with the second-order
model to fit the experimental data better. Moreover, three factors
(phosphate concentration, flow rate, and interfering ions) were
examined at column run method to evaluate the practical application
of ACF-La to the continuous removal phosphate from solution. Furthermore,
how the factors (eluted solution concentration, eluted time, and
regeneration number) affect the regeneration efficiency of ACF-La
was also investigated. These findings suggest that ACF-La has
a considerable potential for the application of phosphate removal
from contaminated waters.
Keywords: Phosphate removal; Activated carbon fiber; Lanthanum;
Column adsorption』
1. Introduction
2. Materials and methods
2.1. Materials
2.2. Preparation and characterization of adsorbent
2.3. Adsorption of phosphate and the stability of ACF-La
2.4. Effect of interfering ions on phosphate adsorption
2.5. Column adsorption of ACF-La
2.6. Regeneration of ACF-La
2.7. Data analysis
3. Results and discussion
3.1. SEM and BET studies of ACF and ACF-La
3.2. Phosphate adsorption of ACF and ACF-La
3.3. The stability of ACF-La
3.4. Effect of the interfering ions on phosphate removal of ACF-La
3.4.1. Effect of interfering ions on phosphate adsorption
3.4.2. Effect of interfering ions on kinetic adsorption
3.5. The column adsorption of ACF-La
3.5.1. Effect of the phosphate concentration on column adsorption
of ACF-La
3.5.2. Effect of flow rate on column adsorption of ACF-La
3.5.3. Effect of the interfering ions on column adsorption of
ACF-La
3.6. The regeneration of ACF-La
3.6.1. Effect of concentration of eluted solution on regeneration
of ACF-La
3.6.2. Effect of eluted time on regeneration of ACF-La
4. Conclusion
Acknowledgments
References