- Title
- Facile use of silver nanoparticles-loaded alumina/silica in nanofluid formulations for enhanced catalytic performance toward 4-nitrophenol reduction
- Creator
- Mannu, Rashmi; Karthikeyan, Vaithinathan; Veerappa, Murugendrappa Malalkere; Roy, Vellaisamy A. L.; Gopalan, Anantha-Iyengar; Saianand, Gopalan; Sonar, Prashant; Xu, Binrui; Lee, Kwang-Pill; Kim, Wha-Jung; Lee, Dong-Eun; Kannan, Venkatramanan
- Relation
- International Journal of Environmental Research and Public Health Vol. 18, Issue 6, no. 2994
- Publisher Link
- http://dx.doi.org/10.3390/ijerph18062994
- Publisher
- MDPI AG
- Resource Type
- journal article
- Date
- 2021
- Description
- The introduction of toxic chemicals into the environment can result in water pollution leading to the degradation of biodiversity as well as human health. This study presents a new approach of using metal oxides (Al₂O₃ and SiO₂) modified with a plasmonic metal (silver, Ag) nanoparticles (NPs)-based nanofluid (NF) formulation for environmental remediation purposes. Firstly, we prepared the Al₂O₃ and SiO₂ NFs of different concentrations (0.2 to 2.0 weight %) by ultrasonic-assisted dispersion of Al₂O₃ and SiO₂ NPs with water as the base fluid. The thermo-physical (viscosity, activation energy, and thermal conductivity), electrical (AC conductivity and dielectric constant) and physical (ultrasonic velocity, density, refractive index) and stability characteristics were comparatively evaluated. The Al₂O₃ and SiO₂ NPs were then catalytically activated by loading silver NPs to obtain Al₂O₃/SiO₂@Ag composite NPs. The catalytic reduction of 4-nitrophenol (4-NP) with Al₂O₃/SiO₂@Ag based NFs was followed. The catalytic efficiency of Al₂O₃@Ag NF and SiO₂@Ag NF, for the 4-NP catalysis, is compared. Based on the catalytic rate constant evaluation, the catalytic reduction efficiency for 4-NP is found to be superior for 2% weight Al₂O₃@Ag NF (92.9 × 10⁻³ s⁻¹) as compared to the SiO₂@Ag NF (29.3 × 10⁻³ s⁻¹). Importantly, the enhanced catalytic efficiency of 2% weight Al₂O₃@Ag NF for 4-NP removal is much higher than other metal NPs based catalysts reported in the literature, signifying the importance of NF formulation-based catalysis.
- Subject
- nanofluids; metal oxides; silver nanoparticles; thermo-physical properties; catalytic reduction; 4-nitrophenol; SDG 3; SDG 6; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1452567
- Identifier
- uon:44455
- Identifier
- ISSN:1660-4601
- Rights
- © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
- Language
- eng
- Full Text
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