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- Title
Removal of Orange G dye from water using halloysite nanoclay-supported ZnO nanoparticles.
- Authors
Al-Beladi, Ahlam A.; Kosa, Samia A.; Wahab, Roswanira Abdul; Salam, Mohamed Abdel
- Abstract
Zinc oxide nanoparticles (ZnO NPs) supported over halloysite nanoclay (ZnO/HS) were investigated for the removal of Orange G (OG) dye in simulated water and real water samples. This study aimed to synthesize ZnO NPs/HS to photo-catalytically degrade OG dye in the aforementioned water samples. In addition to establishing the kinetics and thermodynamics of the reaction. Surface and physicochemical characterizations affirmed the ZnO NPs/HS were mesoporous (61.0 m2 g-1) with the rod-shaped nanoparticles homogeneously dispersed over the surface of HS. Employment of ZnO/HS at a mass ratio of 3:47 (w/w) degraded the highest quantity of the dye, amounting to a mass loss of >100 mg in just 2 h (pH < 12). The UV-irradiated and direct sunlight-activated photodegradation of aqueous OG dye by ZnO/HS followed a first-order kinetic model with the latter exhibiting a higher rate constant (4.87 × 10-3 min-1). Meanwhile, values of ΔG (--4.60 kJ mol-1), ΔH (+42.8 kJ mol-1), and ΔS (+159 J mol-1 K-1) indicated that the ZnO/HS-UVirradiated photodegradation process was entropically driven. The ZnO NPs/HS photocatalyst efficiently degraded OG dyes (49.78%--94.36%) dissolved in various real water samples, thus envisaging its applicability for convenient in situ photocatalytic treatment of contaminated water bodies.
- Subjects
HALLOYSITE; NANOPARTICLES; WATER use; WATER pollution; CHEMICAL kinetics; BODIES of water
- Publication
Desalination & Water Treatment, 2020, Vol 196, p287
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2020.25923