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Determination of concentration of basic sites on oxides by IR spectroscopy.
Spectrochim Acta A Mol Biomol Spectrosc
November 2024
Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków, Poland. Electronic address:
As it is commonly known, CO reacts simultaneously with basic O and basic OH sites on oxides forming carbonates and bicarbonates, which can be followed by infrared spectroscopy (IR). However, here, we succeeded to elaborate experimental conditions under which CO reacted solely with O forming CO for ZrO and CeO, and calculated the extinction coefficients of diagnostic bands of carbonate and bicarbonate species. For the first time, the developed IR method enabled the concentrations of O and basic OH for ZrO, CeO, AlO and CuO to be measured separately.
View Article and Find Full Text PDFPreparation, Characterization and Evaluation of Flavonolignan Silymarin Effervescent Floating Matrix Tablets for Enhanced Oral Bioavailability.
Molecules
March 2023
Department of Pharmacy, University of Malakand, Chakdara 18000, KP, Pakistan.
The convenient and highly compliant route for the delivery of active pharmaceutical ingredients is the tablet. A versatile platform of tablets is available for the delivery of therapeutic agents to the gastrointestinal tract. This study aimed to prepare gastro retentive drug delivery floating tablets of silymarin to improve its oral bioavailability and solubility.
View Article and Find Full Text PDFInsight into micropollutant abatement during ultraviolet light-emitting diode combined electrochemical process: Reaction mechanism, contributions of reactive species and degradation routes.
Sci Total Environ
June 2023
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Article Synopsis
- - The study examines how using an electrochemical process combined with ultraviolet light can effectively break down micropollutants in wastewater containing chlorine, focusing on substances like atrazine, primidone, ibuprofen, and carbamazepine.
- - Results showed high degradation efficiencies (up to 99.8%) after just 15 minutes of treatment, with factors like increased current and UV light improving the process, while compounds like bicarbonate and humic acid hindered it.
- - The research also investigates the mechanisms of how these pollutants are degraded, identifying free radicals generated during the process and outlining their contributions, which highlights the potential for this combined method to save energy compared to traditional methods.
Life cycle assessment of a novel tannin-boron association for wood protection.
Sci Total Environ
February 2023
Research Unit BIOWooEB, CIRAD, TA/B 114/16, 34398 Montpellier Cedex 5, France.
In these studies of fix boron compounds, associations between tannins and boron (TB) in the form of boric acid appear to be of interest. These TB associations allow the use of boron at very low levels (in compliance with EU restrictions, 2008/58/EC) and limit boron leaching which maintains biological resistance and fire retardant properties. As a consequence, TB wooden products present an extended service life compared to boron compounds alone and were designed to be environmentally-friendly wood protection systems.
View Article and Find Full Text PDFA europium(III)-based nanooptode for bicarbonate sensing - a multicomponent approach to sensor materials.
Chem Commun (Camb)
August 2022
Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Denmark.
Lanthanide luminescence contains detailed chemical information and can be used to report on several chemical analytes. This has been exploited through elaborate synthesis of responsive lanthanide complexes. Here, we report on a less elaborate approach and assemble four different nanooptodes.
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