PHOTOCHEMICAL DISCOLORATION OF AQUEOUS DYE SOLUTIONS IN UVlFe(III) SYSTEM: INORGANIC ANIONS' EFFECTS

摘要

Effect of four inorganic anions on photochemical discoloration rates of five dyes C.I. reactive red 2, C.I. reactive blue 4, C.I. reactive black 8, C.I. basic red l3 and C.I. basic yellow 2, were studied in aqueous solutions containing Fe(III) salts. With identica1 Fe(III) concentration and pH = 3.0, different inorganic anions coexisting with Fe~3+ resulted in different photochemical discoloration rates in the order NO_3 > Cl~- ≈ C1O~-1_4 > SO~2-_4. The effect of NO_3 which also has significant photoactivity was detailedly investigated.