Nachhaltiger Eisen‐Photokatalysator auf Holzbasis für vielfältige Anwendungen mit Sonnenlicht: Wasseraufbereitung und radikalische Photopolymerisation

Abstract

Durch Behandlung von Holz und Eisenoxid wurde ein nachhaltiger Photokatalysator für vielfältige Verwendungzwecke hergestellt, welcher demethyliertes Lignin (Fe3O4@D‐wood) enthält. Die Charakterisierung erfolgte mittels XRD, UV/Vis, Photostromunterschungen und elektrochemischen Messungen. Dieses Material wurde zum Gegenstand photokatalytischer Untersuchungen für die Wasseraufbereitung und die Materialsynthese mittels radikalischer Photopolymerisation. Die Bestrahlung von Fe3O4@D‐wood mit künstlichem Sonnenlicht zeigte eine verbesserte Aktivität bei der photochemischen Oxidation von organischen Schadstoffen in Gegenwart von H2O2. Die effiziente Erzeugung reaktiver Radikale ermöglichte bei diesem System auch die Photopolymerisation. Hier können Radikale, die auf reaktiven Sauerstoffspezies (ROS) basieren und in dem katalytischen Zyklus erzeugt werden, als die dominierenden Spezies zur Initiierung der radikalischen Polymerisation angesehen werden. Eine Mischung aus UDMA und TPGDA zeigte eine gute Reaktivität mit Cumolhydroperoxid (CHP). Der für die Wasseraufbereitung verwendete Photokatalysator ermöglicht die Wiederverwendung für die Photopolymerisation.

Light‐Mediated Polymerization Catalyzed by Carbon Nanomaterials

“…Transmission Electron Microscopy (TEM), Field Emission Scanning Electron Microscopy (FESEM), High-Resolution TEM (HR-TEM), Dynamic Light Scattering (DLS), and X-Ray diffraction (XRD) techniques gave information regarding size and morphology. [35,62,83,141,142,148,215] ii) Elements and surficial moieties. Energy Dispersive X-Ray Spectroscopy (EDS, also abbreviated as EDX or XEDS), and X-Ray Photoelectron Spectroscopy (XPS) reported on elemental composition on the surface.…”

“…Fourier Transform Infrared Spectroscopy (FTIR), and Raman spectroscopy gave information about the availability of some functional groups. [35,62,83,141,142,148,215] iii) Optical properties. UV/Vis spectra, stationary and timeresolved emission spectroscopy from 30 ps to seconds, and transient absorption spectroscopy reported about electronic transitions in carbon nanomaterials.…”

“…The oxygen tolerance of this system appears highly advantageous for practical applications, particularly in the chemical solidification of coatings [229] requesting inconvenient purging with CO 2 as inert gas would benefit from such systems. [62,66,68] The capability of carbon nitrides to generate ROS has also been utilized in emulsion polymerization systems [76] in a surfactant-free environment for photopolymerization. Fig- Cellulose available in waste based on wood can be converted into CDs.…”

In situ single iron atom doping on Bi2WO6 monolayers triggers efficient photo-fenton reaction

“…Particularly, the presence of persistent organic pollutants poses serious risks to aquatic life and public health. In response, there is a pressing need to develop effective catalytic systems capable of degrading these stubborn contaminants, thus contributing to environmental cleanup efforts [ [7] , [8] , [9] , [10] , [11] , [12] , [13] ]. The photo-Fenton process has been regarded as a green and sustainable catalytic process.…”

NHC-catalyzed enantioselective radical reactions of enal and pyridinium salt: mechanism and origin of regio- and stereoselectivities

“…Radical reactions have become increasingly popular due to their numerous advantages, such as relatively mild reaction conditions, excellent functional group tolerance, and the ability to efficiently and quickly assemble complex molecules and functions. [1][2][3] As a result, these kinds of reactions have been widely applied across various fields, including organic synthesis, 4,5 drug design, [6][7][8] materials science, [9][10][11] and more. In recent years, a variety of effective radical generation strategies and highly selective radical reactions have been developed using photochemistry, [12][13][14] electrochemistry, [15][16][17] organic superelectron donors, 18,19 and transition metal catalysis.…”