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We present a sustainable and safe method for synthesizing aromatic ketones and biphenyls using quartz sand as a green medium. Quartz sand replaces traditional solvents, providing a safer, eco-friendly alternative in Suzuki-Miyaura coupling and decarbonylative coupling reactions. The Suzuki-Miyaura coupling reactions occur under mild, solvent-free conditions with efficient synthesis and easy purification. Both quartz sand and catalyst are reusable, highlighting the method's resource efficiency and environmental sustainability. Biphenyls are produced via ligand- and copper salt-assisted decarbonylative coupling.
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http://dx.doi.org/10.1021/acs.joc.5c00293 | DOI Listing |
Environ Sci Pollut Res Int
August 2025
Civil Engineering Department, Federal Rural University of Pernambuco, Recife, Pernambuco, 50740-530, Brazil.
In recent years, the use of supplementary cementitious materials (SCMs) in building materials has increased due to concerns about CO emissions from the cement industry. On the other hand, the scarcity of traditional sources of SCMs in certain regions exacerbates the issue of high demand for these materials in concrete production. In this context, this article explores the chemical, mineralogical, morphological, and physical properties and pozzolanic activity of two types of diatomaceous earth (DE) obtained from industrial waste and by-products.
View Article and Find Full Text PDFACS Appl Mater Interfaces
September 2025
University of Maine, Civil and Environmental Engineering, Orono, Maine 04469, United States.
This article reports the effect of spherical particle size (4-30 nm) on magnetic properties and microwave (MW) reactivity of superparamagnetic iron oxide nanoparticles (SPIONs) toward environmental hyperthermia-based applications. For this, silica-coated, single domain iron oxide nanoparticles (IONPs@silica) were precisely synthesized via thermal decomposition and subsequently coated by a reverse microemulsion. Transmission electron microscopy and X-ray diffraction confirmed the formation of spherical, monodisperse, single continuous layer silica-coated magnetite nanoparticles.
View Article and Find Full Text PDFJ Environ Manage
August 2025
Hebei University of Environmental Engineering, Qinhuangdao, 066102, China.
The horizontal transport of microplastics on soil surfaces represents a crucial pathway for their distribution in the environment. This study systematically investigated the horizontal transport characteristics of microplastics under simulated hydrodynamic conditions to understand their behavior during surface runoff scouring. Experiments were conducted using 1 μm polystyrene particles and quartz sand (250-425 μm) to examine the effects of runoff velocity (10, 16, 23 cm/s) and slope gradient (0 %, 3 %, 5 %) on microplastic transport.
View Article and Find Full Text PDFEnviron Geochem Health
August 2025
School of Municipal and Environmental Engineering, Shandong Jianzhu University, No.1000 Fengming Road, Licheng District, Jinan City, 250101, Shandong Province, China.
Microplastics (MPs) as an emerging environmental contaminant pose significant ecological and health risks. This study investigated polystyrene microplastics (PS-MPs) transport and release in saturated heterogeneous porous media using quartz sand columns (eight configurations: homogeneous and heterogeneous) and Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Experimental results showed increased PS-MPs retention in homogeneous media with smaller medium particles, larger PS-MPs (PS100, PS1000, PS5000), and higher ionic strength (1-10 mM NaCl/CaCl).
View Article and Find Full Text PDFSci Rep
August 2025
Department of Geosciences, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Kingdom of Saudi Arabia.
This study presents an analysis of the morphology of sand particles and their contacts using high-resolution microcomputer tomography (CT) and scanning electron microscopy (SEM). Raw 3D images are filtered, binarized, and smoothed to distinguish the granular space from the void space. The 3D granular space is segmented via an advanced adaptive watershed algorithm.
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