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َAbdolraouf Samadi-Maybodi

Academic rank: Professor
ORCID:
Education: PhD.
ScopusId:
Faculty: Faculty of Chemistry
Address:
Phone: 011-35302396

Research

Title
Dual Cocatalysts Loaded Reverse Type-I Core/Shell Quantum Dots for Photocatalytic Antibacterial Applications
Type
JournalPaper
Keywords
determination of MIC and MBC, disc diffusion assays, detection of OHc radicals, detection of O2c using a chemiluminescence technique, monitoring of lipid peroxidation, and monitoring of protein carbonyl
Year
2018
Journal Journal of Materials Chemistry A
DOI
Researchers Mohammad Reza Shariati ، َAbdolraouf Samadi-Maybodi ، Abasalt Hosseinzadeh Colagar

Abstract

Here, we combined the benefits of reverse type-I core/shell quantum dots (CSQDs) and co-catalysts to improve both the performance and durability of reverse type-I CSQDs in photocatalytic antibacterial applications. For this purpose, co-catalysts of Ag and PdS were loaded on the surface of ZnS/CdS CSQDs to facilitate the spatial separation and transfer of photogenerated electrons and holes in the assynthesized CSQDs. Time-resolved and steady-state emission spectroscopy in the presence and absence of quenchers (electron quenching: NO3 and hole quenching: 4-methoxyphenol) was exploited to map out the distribution of the electron/hole wave functions in Ag-PdS/ZnS/CdS nanohybrids. The antibacterial activities of the as-synthesized samples were also studied using broth tube dilution and paper disc diffusion approaches against S. saprophyticus and E. coli as model strains of Gram-positive and Gramnegative microbes. The as-synthesized Ag-PdS/ZnS/CdS nanohybrid showed enhanced efficiencies in the photodecomposition of both Gram-negative and Gram-positive microorganisms compared to ZnS/CdS, ZnS and CdS. The roles of O2c and OHc in the bactericidal action of Ag-PdS/ZnS/CdS were investigated through chemiluminescence and fluorescence approaches, respectively. Finally, the simultaneous effects of radical species on lipid peroxidation and on the proteome were investigated