Počet záznamů: 1

Competitive adsorption and photodegradation of salicylate and oxalate on goethite

  1. 1.
    0359745 - UFCH-W 2012 RIV NL eng J - Článek v odborném periodiku
    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
    Grant CEP: GA MŠk 1M0577
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: goethite * oxalate * salicylate
    Kód oboru RIV: CG - Elektrochemie
    Impakt faktor: 3.407, rok: 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.
    Trvalý link: http://hdl.handle.net/11104/0197467