Graphene Oxide-Doped CNT Membrane for Dye Adsorption
Recently, graphene oxide (GO) has been largely investigated as a potential adsorbent towards dyes. However, the major obstacle to its full employment is linked to its natural powder consistence, which greatly complexifies the operations of recovery and reuse. With the aim to overcome this issue, the...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-05-01
|
| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/15/11/782 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850129544668774400 |
|---|---|
| author | Mariafrancesca Baratta Fiore Pasquale Nicoletta Giovanni De Filpo |
| author_facet | Mariafrancesca Baratta Fiore Pasquale Nicoletta Giovanni De Filpo |
| author_sort | Mariafrancesca Baratta |
| collection | DOAJ |
| description | Recently, graphene oxide (GO) has been largely investigated as a potential adsorbent towards dyes. However, the major obstacle to its full employment is linked to its natural powder consistence, which greatly complexifies the operations of recovery and reuse. With the aim to overcome this issue, the present work reports on the design of GO-modified carbon nanotubes buckypapers (BPs), in which the main component, GO, is entirely entrapped in the BP grid generated by CNTs for the double purpose of (a) increasing adsorption performance of GO-BPs and (b) ensure a fast process of regeneration and reuse. Adsorption experiments were performed towards several dyes: Acid Blue 29 (AB29), Crystal Violet (CV), Eosyn Y (EY), Malachite Green (MG), and Rhodamine B (RB) (C<sub>i</sub> = 50 ppm, pH = 6). Results demonstrated that adsorption is strictly dependent on the charge occurring both on GO-BP and dye surfaces, observing great adsorption capacities towards MG (493.44 mg g<sup>−1</sup>), RB (467.35 mg g<sup>−1</sup>), and CV (374.53 mg g<sup>−1</sup>), due to the best coupling of dye cationic form with negative GO-BP surface. Adsorption isotherms revealed that dyes capture onto GO-BPs is thermodynamically favored (ΔG < 0), becoming more negative at 313 K. Kinetic studies evidenced that the process can be described through a pseudo-first-order model, with MG, RB, and CV exhibiting the highest values of k<sub>1</sub>. In view of these results, the following trend in GO-BP adsorption performance has been derived: MG ≈ RB > CV > AB29 > EY. |
| format | Article |
| id | doaj-art-ff36c43e7e77421ea1dbcb5f42a8090f |
| institution | OA Journals |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj-art-ff36c43e7e77421ea1dbcb5f42a8090f2025-08-20T02:32:56ZengMDPI AGNanomaterials2079-49912025-05-01151178210.3390/nano15110782Graphene Oxide-Doped CNT Membrane for Dye AdsorptionMariafrancesca Baratta0Fiore Pasquale Nicoletta1Giovanni De Filpo2Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, ItalyDepartment of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Rende, ItalyDepartment of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, ItalyRecently, graphene oxide (GO) has been largely investigated as a potential adsorbent towards dyes. However, the major obstacle to its full employment is linked to its natural powder consistence, which greatly complexifies the operations of recovery and reuse. With the aim to overcome this issue, the present work reports on the design of GO-modified carbon nanotubes buckypapers (BPs), in which the main component, GO, is entirely entrapped in the BP grid generated by CNTs for the double purpose of (a) increasing adsorption performance of GO-BPs and (b) ensure a fast process of regeneration and reuse. Adsorption experiments were performed towards several dyes: Acid Blue 29 (AB29), Crystal Violet (CV), Eosyn Y (EY), Malachite Green (MG), and Rhodamine B (RB) (C<sub>i</sub> = 50 ppm, pH = 6). Results demonstrated that adsorption is strictly dependent on the charge occurring both on GO-BP and dye surfaces, observing great adsorption capacities towards MG (493.44 mg g<sup>−1</sup>), RB (467.35 mg g<sup>−1</sup>), and CV (374.53 mg g<sup>−1</sup>), due to the best coupling of dye cationic form with negative GO-BP surface. Adsorption isotherms revealed that dyes capture onto GO-BPs is thermodynamically favored (ΔG < 0), becoming more negative at 313 K. Kinetic studies evidenced that the process can be described through a pseudo-first-order model, with MG, RB, and CV exhibiting the highest values of k<sub>1</sub>. In view of these results, the following trend in GO-BP adsorption performance has been derived: MG ≈ RB > CV > AB29 > EY.https://www.mdpi.com/2079-4991/15/11/782water pollutantscarbon nanotubesbuckypapersgraphene oxidedyes |
| spellingShingle | Mariafrancesca Baratta Fiore Pasquale Nicoletta Giovanni De Filpo Graphene Oxide-Doped CNT Membrane for Dye Adsorption Nanomaterials water pollutants carbon nanotubes buckypapers graphene oxide dyes |
| title | Graphene Oxide-Doped CNT Membrane for Dye Adsorption |
| title_full | Graphene Oxide-Doped CNT Membrane for Dye Adsorption |
| title_fullStr | Graphene Oxide-Doped CNT Membrane for Dye Adsorption |
| title_full_unstemmed | Graphene Oxide-Doped CNT Membrane for Dye Adsorption |
| title_short | Graphene Oxide-Doped CNT Membrane for Dye Adsorption |
| title_sort | graphene oxide doped cnt membrane for dye adsorption |
| topic | water pollutants carbon nanotubes buckypapers graphene oxide dyes |
| url | https://www.mdpi.com/2079-4991/15/11/782 |
| work_keys_str_mv | AT mariafrancescabaratta grapheneoxidedopedcntmembranefordyeadsorption AT fiorepasqualenicoletta grapheneoxidedopedcntmembranefordyeadsorption AT giovannidefilpo grapheneoxidedopedcntmembranefordyeadsorption |