Competitive adsorption and photodegradation of salicylate and oxalate on goethite

0359745 - ÚFCH JH 2012 RIV NL eng J - Journal Article
Krýsa, J. - Jirkovský, Jaromír - Bajt, O. - Mailhot, G.
Competitive adsorption and photodegradation of salicylate and oxalate on goethite.
Catalysis Today. Roč. 161, č. 1 (2011), s. 221-227. ISSN 0920-5861. E-ISSN 1873-4308
R&D Projects: GA MŠMT 1M0577
Institutional research plan: CEZ:AV0Z40400503
Keywords : goethite * oxalate * salicylate
Subject RIV: CG - Electrochemistry
Impact factor: 3.407, year: 2011

This work deals with the competitive adsorption and photodegradation of salicylate and oxalate on alpha-FeOOH (goethite) which is a predominant crystalline modification of iron oxide present in sea sediment. pH is a crucial parameter in goethite photodissolution; therefore, by means of a pH stat titration, pH was kept constant during all experiments. For either acidic (pH 3) or neutral (pH 6) pH values oxalate is preferentially adsorbed on the goethite surface. Thus, in the presence of oxalate, adsorption of salicylate is suppressed and for oxalate concentration 2 mM is even negligible. Without oxalate the photodegradation of salicylate on goethite is negligible due to the short circuiting effect of photo-generated h(+) and e(-). When oxalate is present in the system photodissolution of goethite takes place, which results in the formation of OH radicals and photodegradation of salicylate.
Permanent Link: http://hdl.handle.net/11104/0197467