Rose Bengal Immobilized on Wool as an Efficiently “Green” Sensitizer for Photooxygenation Reactions

Abstract

A new type of supported photosensitizer derived from renewable wool and Rose Bengal is described. The novel sensitizer could efficiently promote the photooxygenation of furan derivatives to the corresponding 5-hydroxy-2-(5H)-furanone in excellent yields, via singlet oxygen, using visible light as the energy source. The sensitizer could be easily recovered from the reaction mixture by a simple filtration. It is discovered that the recovered sensitizer can be reused four times.

Contributions of photochemistry to bio-based antibacterial polymer materials

“…Xanthene derivatives constitute a well-known family of dyes, including Fluorescein, Eosin Y (EY), Phloxine B and Rose Bengal (RB). The latter is probably the most studied for antibacterial systems [170][171][172][173][174][175] , for various applications requiring singlet oxygen production. EY was also incorporated in coatings 176 or fabrics 177 .…”

Organocatalytic Keratin Sponges for the Chemical Fixation of CO2 into Cyclic Carbonates

“…24 To the best of our knowledge, however, the heterogenization of organocatalysts on natural keratin has been reported in two single studies dealing with the adsorption of Rose Bengal on wool fabric to perform a limited number of photooxidation reactions. 25,26 Overall, excluding keratin composites, researchers have rarely addressed the morphology control in the fabrication of keratinous catalytic materials. 21 However, porous structures may offer higher chemical stability of the protein-based supports and facilitate the mass transfer of reactants, which is a critical phenomenon, especially in gas−liquid−solid reactions.…”

Rose Bengal Immobilized on Cellulose Paper for Sustainable Visible‐Light Photocatalysis

“…[20][21][22][23] For the development of more sustainable processes, the immobilization of Rose Bengal on biopolymers is a more appealing strategy that has surprisingly been mostly overlooked. Wool [24] and natural cotton fibers [25] have been used as biosourced supports for the immobilization of Rose Bengal through physisorption and ionic interactions, respectively. The covalent immobilization of Rose Bengal on chitosan is another strategy which increases the robustness of the photocatalytic material.…”