Photocatalytic degradation of atrazine by porphyrin and phthalocyanine complexes.
This study principally focused on a new kind of photochemical reaction catalyst: porphyrin and phthalocyanine complexes. In a first step, the preparation of the catalysts was optimized. A resin has been chosen to be the support of the complexes. Efficiency of catalytic activity is performed on the degradation of a pesticide: atrazine. The best atrazine degradation occurs with 4.6% of complexes versus substrate. The role of the surface has also been shown to be important. Then, their performances were demonstrated in terms of kinetics and degradation routes, compared to a classical catalyst: titanium dioxide. This study seeks to assess the efficiency of these systems both in a mercury lamp reactor and under solar irradiation which reduces energy costs. The best atrazine degradation half-life found for the complexes is about 200 min with the iron phthalocyanine. These catalysts exhibit particular oxidation activities. Indeed, the degradation routes have been found different between the semi-conductor and the metallic complexes. These complexes are able to cleave the triazinic ring more efficiently than the titanium dioxide.
Héquet
V
V
Ecole des Mines de Nantes, Département Systèmes Energétiques et Environnement, France.
Le Cloirec
P
P
Gonzalez
C
C
Meunier
B
B
D001280:Atrazine / Q000737:chemistry*; D002384:Catalysis; D006801:Humans; D007211:Indoles; D054833:Isoindoles; D010575:Pesticides / Q000737:chemistry*; D010777:Photochemistry; D011166:Porphyrins; D012116:Resins, Plant; D013472:Sunlight; D014874:Water Pollutants, Chemical; D018508:Water Purification
D007211:Indoles; D054833:Isoindoles; D010575:Pesticides; D011166:Porphyrins; D012116:Resins, Plant; D014874:Water Pollutants, Chemical; D001280:Atrazine; C013647:phthalocyanine