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研究了 可见光（ ≥４２ ０ ｎ ｍ ） 照射下 染料茜素 红在空气 饱和 的 Ｔｉ Ｏ２ 水溶 液中 发生 的光 催化降解过 程． 借 助紫外 、核磁、顺 磁、红外 、色质 联用等手 段，发现 染料茜素 红的光 催化 降解 过程 符合 Ｌａｎｇ ｍ ｕｉｒ Ｈｉｎｓｈｅｌｗ ｏｏｄ 模型，在 降解过程 中产 生了 过氧 化 物． 核磁 、红 外和 色质联 用等 结 果证 实，主要降解 中间产 物为邻苯 二甲酸 ． Ｃ Ｏ Ｄ 测试 结 果表 明， 其矿 化产 率 达３ ０ ％ ， Ｅ Ｓ Ｒ 结 果证 实， 在降解过程 中有 ⒒ Ｏ Ｈ 自由基 生成，说 明其与 染料的降 解机理有 密切联 系．
The photocatalytic degradation of alizarin red in air saturated Ti O2 aqueous solution under visible light (≥42 0 n m) irradiation was studied. By means of UV, NMR, paramagnetic, infrared, color-mass spectrometry and other means, it was found that the photocatalytic degradation process of alizarin red in dye accords with Langmuir-Hinshelwod model and produces peroxide in the process of degradation. The results of NMR, IR and color-mass spectrometry confirmed that the major intermediate product of degradation was phthalic acid. The C O D test results showed that the mineralization yield was 30%. The E S R results confirmed that ⒒ O H radical was generated during the degradation process, indicating that it is closely related to the degradation mechanism of the dye.