Removal of benzoie acid in aqueous solution by Fe(Ⅲ) homogeneous photocatalysis

摘要

The behaviour of the system Fe(Ⅲ)/Air/UV-benzoic acid is investigated in the pH range 2.0-5.5 and Fe(Ⅲ) concentration up to 60 μM. The oxidation process develops through the establishment of an iron cycle in which HO radicals are produced by Fe(OH)~(2+) photolysis and the resulting Fe(Ⅱ) photo-oxidized to Fe(Ⅲ) by dissolved oxygen. A kinetic model is developed and used to simulate the behaviour of the system.