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Efficient Adsorption of Sulfamethazine onto Modified Activated Carbon: A Plausible Adsorption Mechanism
Open accessAbstract
Activated carbon (AC) was modified by FeCl 3. Batch experiments were carried out to evaluate the characteristics of equilibrium, kinetics and thermodynamics of Sulfamethazine adsorption onto original and modified AC. The results showed that Fe 3+treatment changed the surface area, pore volume and surface zeta potential and increased the number of surface oxygenic functional groups. The adsorption of Sulfamethazine on modified activated carbon (MAC) was significantly improved. Isotherm test results revealed that the adsorption isotherms of Sulfamethazine on MAC fit the Freundlich, Langmuir and Temkin equations well. The maximum adsorption quantity of Sulfamethazine on MAC was 17.2414 mg/g at 25 °C. The adsorption kinetics of Sulfamethazine on AC and MAC can be characterized by the pseudo-second-order model. The adsorption process was affected by membrane diffusion, surface adsorption and internal diffusion. The adsorption quantities of Sulfamethazine first increased and then decreased for pH between 3 and 10. The removal efficiencies decreased with increasing temperature, which is favorable for adsorption at low temperature. It was also found that the mechanisms of adsorption included micropore capture and electrostatic, hydrogen bonding, π-π electron donor-acceptor (EDA) and coordination interactions as well as other interactions.
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Metadata
- Authors
- Liu, Y., Liu, X., Dong, W., Zhang, L., Kong, Q., & Wang, W.
- Venue
- Scientific Reports
- Published
- 2017-09-29
- Volume
- 7
- Issue
- 1
- Pages
- 12437-12437
- ISSN
- 2045-2322 (ISSN-L)
- OpenAlex
- W2760294292
- Cited by
- 299
- References
- 24
- FWCI
- 7.81
- Type
- journal article
- Language
- en
- Open access
- gold
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