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Article Dans Une Revue Journal of Hazardous Materials Année : 2012

Selective oxidation with nanoporous silica supported sensitizers: An environment friendly process using air and visible light

Résumé

Transparent and porous silica xerogels containing various grafted photosensitizers (PSs) such as anthraquinone derivatives, Neutral Red, Acridine Yellow and a laboratory-made dicyano aromatics (DBTP) were prepared. In most cases, the xerogels were shown to be mainly microporous by porosimetry. The PSs were characterized in the powdered monoliths (form, aggregation, concentration) by electronic spectroscopy which also proved to be a useful tool for monitoring the material evolution after irradiation. These nanoporous xerogels were used as microreactors for gas/solid solvent-free photo-oxygenation of dimethylsulfide (DMS) using visible light and air as the sole reactant. All these PSs containing monoliths were efficient for gas-solid DMS oxidation, leading to sulfoxide and sulfone in varying ratios. As these polar oxidation products remained strongly adsorbed on the silica matrix, the gaseous flow at the outlet of the reactor was totally free of sulfide and odorless. The best results in term of yield and initial rate of degradation of DMS were obtained with DBTP containing xerogels. Moreover, as these materials were reusable without loss of efficiency and sensitizer photobleaching after a washing regeneration step, the concept of recyclable sensitizing materials was approved, opening the way to green process.

Domaines

Chimie Catalyse
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Dates et versions

hal-01499771 , version 1 (31-03-2017)

Identifiants

Citer

Philippe Saint-Cricq, Thierry Pigot, Sylvie Blanc, Sylvie Lacombe-Lhoste. Selective oxidation with nanoporous silica supported sensitizers: An environment friendly process using air and visible light. Journal of Hazardous Materials, 2012, 211-212, pp.266-274. ⟨10.1016/j.jhazmat.2011.09.066⟩. ⟨hal-01499771⟩
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