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342 results on '"Tiwari, Diwakar"'

29. Greener synthesis of novel nanocomposite material for efficient and selective trace detection of Pb2+: Insights of stability and real implications of fabricated electrode.

Author

Sarikokba, Lalhmunsiama, Lalmalsawmi, Jongte, Tiwari, Diwakar, Seung Mok Lee, and Jae-Kyu Yang

Subjects
NANOCOMPOSITE materials, CARBON electrodes, COMPOSITE materials, ELECTRODES, OXALIC acid, WATER analysis
Abstract

This work reports the use of highly efficient nanocomposite material fabricated glassy carbon electrode (Ag(NPs)/ChS/GC) in the trace detection of Pb2+ using differential pulse voltammetry (DPV). A facile method yielded the silane-grafted chitosan (ChS) using 3-trimethoxyoctylsilane, and the bioderived Ag(NPs) was in situ decorated on the ChS composite to obtain Ag(NPs)/ChS. X-ray Diffraction (XRD) results showed the presence of Ag(NPs) within the composite material. Spherical-shaped and uniform distribution of Ag(NPs) were observed in SEM and TEM images of the nanocomposite solid. The cyclic voltammetric studies revealed a significant increase in redox peak currents (i.e., 0.1283 mA), which was obtained using the Ag(NP)/ChS/GC compared to the bare glassy carbon electrode. Further, the electrochemical determination of Pb2+ showed good linearity in anodic peak current and Pb2+ concentrations (5.0-80.0 μg/L), and the limit of detection was 1.97 μg/L. With 10-fold increase in several cationic and anionic interfering ions, oxalic acid and glycine only show interference in determination of Pb2+. The reproducibility study showed a %RSD of 2.43%, and the electrode could be efficiently used for prolonged and repetitive detection having reasonably low %RSD of 2.55%. The real water analysis showed almost 100% recovery of Pb2+ in two different real water samples. [ABSTRACT FROM AUTHOR]

Published
2024
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42. Novel nanocomposite thin films for efficient degradation of Rhodamine B and Rhodamine 6G under visible light irradiation: Reaction Mechanism and Pathway studi.

Author

Vanlalhmingmawia, Chhakchhuak, Sreenivasa, Swamy, Tiwari, Diwakar, and Lee, Seung Mok

Subjects
RHODAMINE B, VISIBLE spectra, THIN films, CATALYST selectivity, GOLD nanoparticles, COMPOSITE membranes (Chemistry)
Abstract

The present investigation aims to synthesize the novel nanocomposite thin film and utilize the material to remove emerging dyes efficiently (i.e., Rhodamine B (R-B) and Rhodamine 6G (R-6G)), in an aqueous solution using LED visible light and UV-A light. A facile synthetic route was adopted to obtain the TiO2-supported bentonite and in situ decorated with Au nanoparticles (NPs) thin film. The advanced analytical techniques characterizes the materials. The laboratory scale reactor was utilized for efficient degradation of R-B and R-6G using thin film catalysts. The percentage removal of R-B was 54.13% (visible light) and 76.26% (UV-A light) and the R-6G, was removed 60.37% (visible light) and 84.68% (UV-A light) at the initial pollutant concentration of 0.5 mg/L and at pH 6.0 using the thin film photocatalyst. The parametric studies demonstrated the insights of degradation mechanisms in photocatalytic operations. A significant mineralization of these dyes is achieved, and the repeated use in reactor operations indicated the catalysts' stability. After six repeated cycles of photocatalytic reaction, the efficacy of catalyst was decreased by 1.02% only (for R-G) and 0.93% only (for R-6G). A plausible reaction pathway was proposed, and the real implications showed higher selectivity of the catalyst. [ABSTRACT FROM AUTHOR]

Published
2023
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