氧化剂和金属离子对刚果红光化学反应的影响

Effects of Oxidants and Metal Ions on the Photochemical Reaction of Congo Red

在紫外光作用下,采用静态方法研究了氧化剂和金属离子对刚果红光化学反应的影响.结果表明,氧化剂对刚果红光化学反应的影响较大,其加速降解顺序为KIO4>K2S2O8>KBrO3>H2O2,加速脱色顺序为KIO4>K2S2O8≈KBrO3>H2O2;金属离子对刚果红光化学反应的影响较小,Fe2+/Cu2+/Al3+/Y3+/La3+易与刚果红生成配合物,Mn2+/Zn2+能够稍微加速刚果红光化学脱色且作用相似;HO·是导致刚果红发生光化学脱色的一个重要因素.

Under the UV-light, effects of oxidants and metal ions on the photochemical reaction of congo red were studied by static method. The results showed that the effects of oxidants on the photochemical reaction of congo red were bigger than that of metal ions. The sequence of their accelerating degradation was KIO_4>K_2S_2O_8>KBrO_3>H_2O_2, and that of accelerating decolorization was KIO_4>K_2S_2O_8≈KBrO_3>H_2O_2. Fe^(2+)/Cu^(2+)/Al^(3+)/Y^(3+)/La^(3+) easily formed coordination compounds with congo red, Mn^(2+)/Zn^(2+) slightly accelerated the photochemical decolorization of congo red and their extents were similar. HO·may be an important factor to cause photochemical decolorization of congo red.