Photocatalytic waste-to-renewable energy nexus using solar light induced quantum dots. (1st May 2023)

• Record Type: Journal Article
• Authors: Roshan, R.; Nahak, B.K.; Mahata, D.; Yadav, P.; Panda, S.; Patra, Santanu; Mahato, S.S.; Tiwari, Ashutosh; Mahata, S.
• Is Part Of: Energy conversion and management. Volume 283(2023)
• Publication Date: 2023-05-01
• Subjects: Circular energy technology -- Waste utility -- Photocatalysis -- Hydrogen generation -- Net-zero protocols; MV Methylene violet -- QDs Quantum dots -- FTIR Fourier Transform Infrared Spectroscopy -- TGA Thioglycolic acid -- TMA Thiomallic Aid -- EDTA Ethylenediaminetetraacetic acid -- DFT Density Functional Theory -- TD-DFT Time-Dependent Density Functional Theory -- GHG Greenhouse gas -- UNEP United Nations Environmental Programme -- IPCC Intergovernmental Panel on Climate Change -- H2 Hydrogen -- SMR Steam methane reforming -- PPCPs Pharmaceuticals and personal care products -- VB Valance Band -- CB Conduction Band -- CdS Cadmium Sulphide -- LEDs Light Emitting Devices -- CA Carboxylic acid -- XRD X-ray diffraction -- FWHM Full width at half-maxima -- SEM Scanning Electron Microscope -- FESEM Field Emission Scanning Electron Microscope -- NPs Nanoparticles -- HOMO Highest Occupied Molecular Orbital -- LUMO Lowest Unoccupied Molecular Orbital -- ESR Electron Spin Resonance -- XPS Xray Photoelectron Spectroscopy -- EDAX Energy Dispersive Spectroscopy; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2023.116917
• Languages: English
• ISSNs: 0196-8904

Abstract

Graphical abstract: Highlights: The cadmium sulfide quantum dots were used as a photocatalyst to efficiently demineralize the dyes for hydrogen evolution. The sulfur vacancy in CdS quantum dots surface demonstrated a viable strategy for improving charge separation and photocatalytic performance. The influence of sulfur vacancy on photocatalytic hydrogen production was systematically investigated. Optimized nanocluster geometry, stability, and band gap were examined by implementing density functional theory and time-dependent density functional theory. The solar light-driven mineralization of dyes treats water can be used for the generation of hydrogen. The reusability of CdS quantum dots makes it significant for a net-zero energy approach. Abstract: Modern green transition obligations support a circular economy to maximize the use of existing resources, where climate-neutral net-zero energy goals argue for a hydrogen economy to minimize the energy dependence on fossil fuels. In this study, the surface functionalized cadmium sulfide nanoparticles were used as a photocatalyst to efficiently demineralize the methylene violet (MV) and rhodamine B (RhB) for hydrogen evolution. The influence of sulfur vacancy on photocatalytic hydrogen production was systematically investigated. The sulfur vacancy in CdS quantum dots (QDs) surface demonstrated a viable strategy for improving charge separation and photocatalytic performance. The impact of vacancy formation on the QDs properties, including the band gap, crystallite size, average strain, photoluminescence, dislocation density, electrostatic repulsion, and texture coefficient were thoroughly examined. The growth kinetics of CdS in the presence of different capping agents was analyzed using UV–Vis, Fourier transform infrared, and photoluminescence spectra. The results of experiments and theoretical calculations were used to examine the interactions of the CdS-ligand and its structural and optoelectronic properties. The thioglycolic acid functionalization effectively passivates surfaces, which gives desirable optical and textural properties and potential circular applications. Optimized nanocluster geometry, stability, and band gap were examined by implementing density functional theory and time-dependent density functional theory. The solar light-driven mineralization of MV and RhB was done, further, the treated water was used for the generation of hydrogen making circular use of CdS quantum dots for a net-zero energy approach.