铁(Ⅲ)-羧酸配合物对水溶性染料的光化学脱色动力学的比较研究

Kinetics study of the coomparison on the discoloration of dyes in aqueous solutions induced by photolysis of Fe(Ⅲ)-carboxylate complexes

铁-柠檬酸，铁-酒石酸，铁-丁二酸，铁-草酸配合物在高压汞灯（λmax＝313nm，250W）的照射下，能使活性艳红X－3B染料水溶液脱色。染料初始浓度在10mg／L～50mg／L时，染料脱色为动力学一级反应，脱色速率随初始浓度增大而降低。在pH2．0～3．0时铁-柠檬酸，铁-滴石酸，铁-丁二酸的染料溶液脱色效果较佳，在pH4．0时铁-草酸的染料溶液脱色效果最好。铁／羧酸盐配比对染料脱色速率也有影响。

The discoloration of dye C. I. reactive red 2 can be accelerated in aqueous solutions containing Fe (Ⅱ )-carboxylate complexes )citrate, oxalate, succinate and tartarate) under near-UV light irradiation 313 m,250W). The discoloration of dye solutions in concentration range 10 mg/L-50 mg/L is pseudo-first order reaction,and the discoloration rate decrease with increasing the initial dye concentration. Optimum pH for photochemical discoloration of dye solutions by Fe(Ⅲ)-citrate,succinate and tartarate respectively is 2.0-3. 0,while 4. 0 by Fe (Ⅱ)-oxalato complex. The Fe3+/Carboxylate ratio have effects on the,discoloration efficiency.