Aspects of superior photocatalytic dye degradation and adsorption efficiency of reduced graphene oxide multiwalled carbon nanotubes with modified ZnO-Al2O3 nanocomposites

Due to the poor effectiveness of nanomaterials, the elimination of hazardous textile dyes from wastewater is quite challenging. A wide range of low-cost, hybrid, and highly effective nanomaterials have attracted much research for their potential in wastewater treatment. Herein, ZnO-Al2O3 nanoparticl...

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Bibliographic Details
Published in:Journal of environmental chemical engineering 2024-04, Vol.12 (2), p.112461, Article 112461
Main Authors: Wani, Ajaz Ahmad, Rather, Ryhan Abdullah, Shaari, Norazuwana, Khan, Umair, Muhammad, Taseer, Hussain, Syed Modassir, Seddek, Laila F., Abed, Ahmed M.
Format: Article
Language:English
Subjects:
Adsorption
Dyes
Nanocomposite
photocatalytic degradation
Wastewater treatment
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Summary:Due to the poor effectiveness of nanomaterials, the elimination of hazardous textile dyes from wastewater is quite challenging. A wide range of low-cost, hybrid, and highly effective nanomaterials have attracted much research for their potential in wastewater treatment. Herein, ZnO-Al2O3 nanoparticles were successfully grafted on reduced graphene oxide/multiwalled carbon nanotubes (ZnO-Al2O3-rGO/MWCNT) via the hydrothermal process. This nanohybrid material has been characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Brunner Emmet Teller (BET) analysis. ZnO-Al2O3-rGO/MWCNT has degraded 30 ppm Congo red dye to 90% within 1 h, while 20 ppm rose Bengal dye to 80% within 1.5 h. The kinetics of degradation for both these dyes is followed well by the pseudo-first-order model. Furthermore, ZnO-Al2O3-rGO/MWCNT was explored for the adsorption of Sudan III and displayed an outstanding removal capacity (220 mg g−1) compared with bare catalyst ZnO−Al2O3 (72 mg g−1). The sorption of Sudan III dye onto the adsorbent is spontaneous endothermic and follows pseudo−second−order kinetics and Langmuir isotherm models. Experiments using radical trapping have shown that hydroxyl radicals are the principal reactive intermediates in the photoexcitation process. The desorption and regeneration of as−prepared nanocomposite are also assessed. [Display omitted]
ISSN:2213-3437
2213-3437
DOI:10.1016/j.jece.2024.112461