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- Title
Alginate-chitosan/carbon nanotubes nanocomposites: an efficient alternative for Co(II) ions removal.
- Authors
Bibi, Azeem; Sadiq-ur-Rehman; Zaheer, Muhammad; Akhtar, Tasleem
- Abstract
Alginate-based sorbents were successfully synthesized for Co(II) ions removal from an aqueous solution. Novel sorbents were prepared by entrapping COOH-MWCNTs (multi-walled carbon nanotubes) in the Algi+Chito matrix by solution casting method under ultrasonic waves without any crosslinker. Physico-chemical studies were carried out by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, transmission electron microscopy, thermogravimetric analysis/differential scanning calorimetry, and Brunauer-Emmett-Teller analysis. Various factors such as contact time, concentration, temperature, pH, and co-existence of foreign ions were explicated. The adsorption capacity of 381, 380, and 383 mg g-1 was achieved at 400 ppm, 3 h, and 25°C. Kinetics followed was pseudo-second-order and equilibrium adsorption data were fitted to the Langmuir linear and Freundlich nonlinear isotherm models, proved by 2 values. Adsorption was favorable with G° values, -515.92, -511.15, and -530.10 kJ mol-1 for nanocomposites. Sorbents also showed affinity to Co(II) ions along with other foreign ions. Sorbents were regenerated (six times) into the initial form for the next removal operation.
- Subjects
MULTIWALLED carbon nanotubes; FOURIER transform infrared spectroscopy; IONS; NANOCOMPOSITE materials; NANOTUBES; ALGINATES; SODIUM alginate
- Publication
Desalination & Water Treatment, 2021, Vol 234, p185
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2021.27636