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Fasfous I, El-Sheikh A, Awwad A, Al-Degs Y, Dawoud J. Interaction Influence of Contact Time and pH on Cobalt Retention by
Carbon Nanotubes Bearing Various Loads of TiO2 and Fe3O4. CURR ANAL CHEM 2022. [DOI: 10.2174/1573411017666211021145844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
<P>Background: Nanomaterials have facilitated remarkable advances in the remediation of
many environmental problems. A few studies have tackled the removal of Co (II) from aqueous
solutions using nanomaterials. Herein, we studied the retention kinetics of cobalt species on carbon
nanotubes (CNTs) bearing different amounts of TiO2 and Fe3O4 nanomaterials individually.
<P>
Methods: CNTs and their TiO2/Fe3O4-modified nanomaterials were well characterized. Cobalt
retention by these adsorbents was investigated considering different influencing factors such as Co
(II) content, solution pH, and time. The kinetic data were fitted with pseudo-first-order, pseudosecond-
order rate models, and intra-particle diffusion models for better elucidation of the mechanism
of Co retention.
<P>
Results: XRD evidenced the formation of TiO2 and Fe3O4. High loads of both oxides were needed
for higher and faster Co retention by CNTs. Co retention capacity increased with increasing the
solution pH. The pseudo-second-order model presented the kinetics of Co retention at 30 oC, and
48% of available capacity was attained within the first hour of interaction by CNT-TiO2 and with a
moderate S/L ratio of 0.5 g/L. Co retention was increased with the amount of oxide to reach a maximum
value of 16. 40 mg/g (90.2% TiO2) and 13.60 mg/g (48.2% Fe3O4). The Jovanović equilibrium
model predicted the maximum retention values as the nearest to the experimental ones.
<P>
Conclusion: The potential of CNT-Fe3O4/TiO2 nanomaterials has been successfully demonstrated
for the removal of cobalt, which makes them highly attractive and cost-effective adsorbents for
wastewater treatment. The reported retention and removal rate values were relatively better than
those seen in the literature. Loading different active oxides by CNTs is an interesting research area
as selective adsorbents can be fabricated with affordable experimental costs.
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Affiliation(s)
- Ismail Fasfous
- Department of Chemistry, Faculty of Science, The Hashemite University, Zarqa, Jordan
| | - Amjad El-Sheikh
- Department of Chemistry, Faculty of Science, The Hashemite University, Zarqa, Jordan
| | - Anas Awwad
- Department of Chemistry, Faculty of Science, The Hashemite University, Zarqa, Jordan
| | - Yahya Al-Degs
- Department of Chemistry, Faculty of Science, The Hashemite University, Zarqa, Jordan
| | - Jamal Dawoud
- Department of Chemistry, Faculty of Science, The Hashemite University, Zarqa, Jordan
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