【摘要】 在太阳光辐射和pH3.0的条件下,使用草酸铁(Ⅲ)络合物/过氧化氢系统对于水中3种具有双活性基的活性染料进行光催化脱色降解,考察了太阳光的强度和活性染料的浓度对光脱色降解反应的影响,并应用紫外光谱法对染料的光脱色降解反应进行了分析。实验结果表明,太阳光的强度和染料浓度对活性染料脱色降解反应具有决定性的影响作用。太阳光的强度越高,染料浓度越低,越有利于活性染料的脱色降解反应。在晴天(40×103～80×103lux)时,浓度为50mg/L的活性染料在60min几乎完全脱色。活性染料的光催化脱色降解反应属于假一级动力学反应,脱色降解后染料分子中的共轭体系和芳香环结构被破坏。更多还原

【Abstract】 <Abstrcat>Photocatalytic discoloration of three reactive dyes containing two reactive groups in water was carried out at pH 3.0 and ferrous （III）-oxalate complex/H₂O₂ by solar irradiation.The effects of solar irradiance and the initital concentration of reactive dyes on the photocatalytic discoloration of reactive dyes were investigated.The photocatalytic degradation of three reactive dyes was examined by UV-vis spectrum. The results showed that the discoloration of three reactive dyes depend significantly on solar irradiance. The dyes of concentration 50 mg/L were almost completely discolored in less than 60 min on the sunny day （illuminance: 40×10³～80×10³ lux）.The photocatalytic decoloration of three reactive dyes were enhanced by decreasing the initial concentration of reactive dyes. Their degradation reaction followed a pseudo-first order kinetic model at different solar irradiance and the initial concentration of reactive dyes. Finally, UV-vis spectrum showed that the most of conjugate structure and aromatic part of reactive dye are destroyed after being photocatalytic degradation.更多还原