Evaluating the detection efficacy of advanced bimetallic plasmonic nanoparticles for heavy metals, hazardous materials and pesticides of leachate in contaminated groundwater

• Published in: Environmental research Vol. 201; p. 111590
• Main Authors: Aarthi, A., Bindhu, M.R., Umadevi, M., Parimaladevi, R., Sathe, G.V., Al-Mohaimeed, Amal M., Elshikh, Mohamed Soliman, Balasubramanian, Balamuralikrishnan
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.10.2021
• Subjects: Bimetals; Groundwater; Leachate; Photocatalyst; Pollution; SERS; Bimetals; Pollution; Groundwater; SERS; Leachate; Photocatalyst
• ISSN: 0013-9351; 1096-0953
• DOI: 10.1016/j.envres.2021.111590

During the decomposition of trashes, leachate is created and leaching is gradually pollutes the surface and groundwater. Thus, the most severe ecological impact is the risk of ground water pollution because of collection of leachate from unlined insecure landfills. Due to the low biodegradable organic strength, irregular productivity and composition, the environmentally neglected landfill leachate treatment is challenging. This work was conducted on a synthetically effective bimetallic surface enhanced Raman spectroscopic (SERS) nanosensor by gold/silver-bimetallic nanoparticles (Au/Ag-NPs), and used for the specific detection of municipal solid waste (MSW) landfill leachate in groundwater. The optical study of Au/Ag-NPs led to reflections from Ag cores and small Au shells. The structural studies represent the FCC structure of Au/Ag-NPs. The core-shell nanocrevice NPs with particle size of 23 nm played an important role with plasmonic behaviour enhances the electromagnetic excitation to achieve SERS detection and plasmonic photocatalysis. Thus, obtained results clearly show that Au was successfully added to Ag-NPs, and its existence can also be confirmed by energy dispersive spectroscopy (EDAX). The prepared SERS based sensors have the potential to detect aromatic hydrocarbon, pesticides and heavy metals from environmentally ignored MSW landfill leachate. In general, the application of this new synergetic strategy of the photocatalytic degradation of leachate was irradiated by visible wavelength with the rate constant of 0.0036/min, 0.0047/min and 0.005/min by Ag-NPs, Au-NPs and Au/Ag-NPs respectively. Overall, this is the only study achieved efficiently with photocatalytic degradation and SERS detection of environmentally ignored real sample (leachate) to make pollutant free homeland aquifers. •Ag and Au nanoparticles detected landfill leachate.•Leachate degrades in the visible region.•Solid profiles and COD ranges were achieved for crosslinked membrane.•UV/Vis spectrophometer confirms the efficiency of each process.