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Metal‐Free and Heterogeneous Photocatalytic Reduction of 4‐Nitroaniline by a Poly(Ethylene Glycol)‐Supported Eosin Dye under Visible‐Light Exposure
Author(s) -
Chibac Andreea L.,
Melinte Violeta,
Brezová Vlasta,
Renard Estelle,
Brosseau Arnaud,
Langlois Valerie,
Versace DavyLouis
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201900040
Subject(s) - ethylene glycol , eosin , photochemistry , eosin y , chemistry , nitroaniline , photocatalysis , catalysis , organic chemistry , medicine , staining , pathology
A new feasible approach for the photoreduction of a chemical pollutant, 4‐nitroaniline, to p ‐phenylenediamine was developed. We highlighted the crucial roles of a polymer backbone and the atmosphere for the efficient heterogeneous reduction of 4‐nitroaniline. The novel synthesized poly(ethylene glycol)‐derived film containing immobilized eosin dye revealed a high photoreduction rate of 4‐nitroaniline. According to laser flash photolysis results the first step of this photoinduced process represents a single electron transfer from eosin radical anion to the 4‐nitroaniline to form a nitroaniline radical anion. The in‐situ electron paramagnetic resonance spin‐trapping experiments evidenced the generation of superoxide radical anion serving as catalyst in the p‐ phenylenediamine production according to a photoreduction process. The main roles play by poly(ethylene glycol) matrix as efficient reducing agent and hydrogen‐donor molecule was also pointed out. A mechanism was proposed to explain the heterogeneous photoreduction of 4‐nitroaniline to p ‐phenylenediamine in the presence of eosin dye‐based poly(ethylene glycol) system under air.