丙酮酸钠光解引发染料水溶液的脱色  

Discoloration of dye solution induced by the photolysis of pyruvate

作　　者：封享华[1] 丁世敏[1] 吴峰[2] 邓南圣[2] 

机构地区：[1]长江师范学院化学及环境科学系,重庆408003 [2]武汉大学资源与环境科学学院,武汉430072

出　　处：《环境工程学报》2007年第11期41-45,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(20177017)

摘　　要：对丙酮酸钠紫外光解所引发的染料橙黄Ⅱ的脱色进行了研究，讨论了pH值、丙酮酸钠初始浓度、染料初始浓度及外加Fe（Ⅲ）对橙黄Ⅱ光致脱色的影响，比较了4种染料的脱色效果，并对反应机理进行了初步探讨。实验表明，丙酮酸盐对染料有较高的光降解脱色效率；pH为3．0～8．0的范围内，橙黄Ⅱ都有很高的脱色率；丙酮酸盐的初始浓度越大，橙黄Ⅱ脱色率和反应初始速率越大；橙黄Ⅱ浓度越大，其脱色率越低，但反应初始速率变化不大；外加Fe（Ⅲ）会抑制橙黄Ⅱ脱色；Fe（Ⅲ）-丙酮酸在水体中也能产生·OH；橙黄Ⅱ的脱色是由丙酮酸钠光解产生的活性自由基等所致，但不是·OH。Discoloration of dye Orange Ⅱ , induced by pyruvate under UV irradiation was preliminarily investigated. The effects of pH value, initial concentration of sodium pyruvate, dye and Fe（ Ⅲ ） on the discoloration were studied in detail. Comparison of the discoloration of four dyes was conducted and the discoloration mechanism was preliminarily studied. A higher discoloration rate of dye in present of pyruvate was obtained. Over the pH range of 3.0 - 8.0, Orange Ⅱ had very high discoloration rate. The higher initial concentration of pyruvate, the higher discoloration rate and initial discoloration reaction rate were. The higher initial concentration of Orange Ⅱ, the lower discoloration rate was, but the change of initial discoloration reaction rate was small. Adseititious Fe （Ⅲ） could restrain the discoloration of Orange Ⅱ. The result showed that iron （ Ⅲ） pyruvate complex could produce · OH, and the discoloration of Orange Ⅱ was induced by active radicals produced by the photolysis of sodium pyruvate instead of · OH.

关 键 词：丙酮酸盐 染料 橙黄Ⅱ 光降解 Fe(Ⅲ) 

分 类 号：X781[环境科学与工程—环境工程]