The effectiveness and adsorption mechanism of iron-carbon nanotube composites for removing phosphate from aqueous environments
- Authors
- Adil, Sawaira; Kim, Jong -Oh
- Issue Date
- Feb-2023
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Iron -carbon nanotube; Multi -walled carbon nanotubes; Phosphate; Adsorption; Desorption; Regeneration
- Citation
- CHEMOSPHERE, v.313, pp.1 - 11
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMOSPHERE
- Volume
- 313
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/184934
- DOI
- 10.1016/j.chemosphere.2022.137629
- ISSN
- 0045-6535
- Abstract
- This study successfully employed iron-carbon nanotubes (Fe-CNT) to recover phosphate (P) from water. We examined the effects of various iron concentrations denoted by Fe-CNT-1 and Fe-CNT-2 on P removal and compared them with pristine carbon nanotubes (CNTs). The adsorption capacity of Fe-CNTs was much better than pristine CNTs. According to the high adsorption capacity, Fe-CNT-2 sample was very effective for P recovery and exhibits similar to 7 times higher P removal efficiency than that of pristine CNTs. The characterization of the as -obtained adsorbent (Fe-CNT-2) and pristine CNTs were performed using X-ray diffraction, Brunauer-Emmett-- Teller method, Field emission scanning electron microscope coupled with energy-dispersive spectroscopy de-tector (FESEM-EDS), X-ray photoelectron spectroscopy and Transmission electron microscopy. Results demonstrated that iron oxide nanoparticles were successfully deposited on the surface of CNT. The adsorption kinetics and isotherm studies for P removal showed pseudo-second-order rate constants (R-2 > 0.99) and the Langmuir isotherm (R-2 > 0.99) respectively, thus revealing that the nature of adsorption was chemisorption. The estimated Langmuir adsorption capacity of Fe-CNT-2 was 36.5 mgP/g or 112 mg PO4/g at an equilibrium time of 3 h. The ionic strength provided by SO42- , NO3-, and Cl- demonstrated no considerable influence on phosphate adsorption. Moreover, the P adsorbed Fe-CNT-2 was efficiently recovered with different concentrations of desorbing reagents, such as NaOH and NaCO32-. Moreover, the findings of X-ray photoelectron spectroscopy (XPS) analysis demonstrated that OH group played a major role in the P removal by Fe-CNT-2. The findings of this study demonstrate that Fe-CNT-2 had a great deal of application as an effective and stable adsorbent for the P recovery from aquatic environments.
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