Titania (TiO) nanoparticles are active photocatalysts, and isoprene (CH) is a biogenic volatile organic compound that contributes crucially to global particulate matter generation. Herein, the direct photooxidation of isoprene by titanium oxide cluster anions with dimensions up to a nanosize by both ultraviolet (UV) and visible (Vis) light excitations has been successfully identified through mass spectrometric experiments combined with quantum chemistry calculations. The potential role of "dry" titania in atmospheric isoprene oxidation has been revealed, and a clear picture of the photooxidation mechanism on titanium oxide nanoparticles has been provided explicitly at the molecular level. The adsorption of isoprene on the atomic oxygen radicals (O) of titanium oxide clusters leads to the formation of the crucial interfacial state (IS) within the band gap of titanium oxides. This IS is demonstrated to be the significant factor in delivering the electron from the π orbital of CH to the Ti orbital in the photooxidation process (CH + Ti-O → CHO + Ti) and creating photoactivity in the Vis region. It is revealed that after the photogeneration of the O radicals by UV excitation on the TiO particle surface, the subsequent reactions can be induced by Vis excitation through the IS. This strategy in both the UV and Vis regions can enhance the efficiency of solar energy harvesting and improve the product yield of the photocatalysis on TiO nanoparticles. New insights have been provided into both the atmospheric chemistry of isoprene and the photochemistry of TiO nanoparticles.
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http://dx.doi.org/10.1021/jacs.1c00326 | DOI Listing |
Luminescence
December 2024
Department of Chemistry, Faculty of Science, Umm Al-Qura University, Makkah, Saudi Arabia.
This study investigates the optical, mechanical, and antimicrobial properties of polypropylene (PP) fibers enhanced with titanium dioxide (TiO) and zinc oxide (ZnO) nanoparticles. Using a Mach-Zehnder interferometric system, we examined the refractive indices, birefringence, and opto-mechanical behavior of blank PP, PP/TiO, and PP/ZnO nanocomposite fibers under various conditions, including different polarization orientations and during cold drawing processes. The 2D Fourier transform algorithm is employed to analyze interferometric data, enabling precise measurements of refractive index profiles and birefringence.
View Article and Find Full Text PDFMicrob Cell Fact
December 2024
Botany and Microbiology Department, Faculty of Science, Suez Canal University, Ismailia, 41522, Egypt.
This comprehensive review explores the emergence of titanium dioxide nanoparticles (TiO-NPs) as versatile nanomaterials, particularly exploring their biogenic synthesis methods through different biological entities such as plants, bacteria, fungi, viruses, and algae. These biological entities provide eco-friendly, cost-effective, biocompatible, and rapid methods for TiO-NP synthesis to overcome the disadvantages of traditional approaches. TiO-NPs have distinctive properties, including high surface area, stability, UV protection, and photocatalytic activity, which enable diverse applications.
View Article and Find Full Text PDFEnviron Pollut
December 2024
Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy; NBFC, National Biodiversity Future Center, Piazza Marina 61, 90133 Palermo, Italy; Department of Life Sciences, University of Trieste, Via Licio Giorgieri, 34127 Trieste, Italy. Electronic address:
Nowadays, ENMs/NPLs particles have not yet been extensively measured in the environment, but there is increased concern that this size fraction may be more widely distributed and hazardous than larger-sized particles. This study aimed to examine the bioaccumulation potential of engineered nanomaterials and nanoplastics (ENMs/NPLs) across marine food webs, focusing on plankton communities and commercial fish species (Engraulis encrasicolus and Scomber colias) from the Gulf of Naples. Laboratory experiments on plankton assemblages exposed to fluorescent polystyrene nanoplastics (PS-NPs, 100 nm) for 24h at concentrations ranging from 0.
View Article and Find Full Text PDFEcotoxicol Environ Saf
December 2024
Department of Environmental Health Sciences, Graduate School of Public Health, Seoul National University, Seoul, South Korea; Institute of Health and Environment, Seoul National University, Seoul, South Korea. Electronic address:
In recent years, concerns regarding the toxicity of organic UV filters in sunscreen products have increased. While sunscreen products contain multiple UV filters in combination, current understanding on their co-occurrence patterns and mixture toxicities is still limited. This study utilized a public database, "Hwahae", and analyzed 2183 sunscreen products marketed in South Korea as of 2019, using an association rule mining (ARM) to elucidate their co-occurrence patterns.
View Article and Find Full Text PDFJ Environ Manage
December 2024
Institute of Urology, Zhong Da Hospital, Southeast University School of Medicine, Nanjing, China. Electronic address:
Titanium dioxide nanoparticles (TiO NPs) are among the most prevalent nanomaterials utilized in industrial and medical fields. However, their impact on spermatogenesis and male fertility remains insufficiently characterized. This study addresses the reproductive toxicity of TiO NPs and elucidates the underlying molecular mechanisms involved.
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