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三价铁离子对TiO2 光催化降解X3B活性艳红染料具有明显的促进作用 .但是 ,当Fe(III)全部转化为Fe(II)离子以后 ,X3B的降解不再加快 .研究表明 ,Fe(III)捕获表面光生电子是导致X3B降解速率增加的主要原因 ,而Fe(III)光解产生羟基自由基使降解X3B的贡献则相对较小 .由于体系缺乏Fe(III) /Fe(II)循环 ,(Photo) Fenton反应参与X3B降解过程的可能性极小 .X3B和Fe(III)竞争吸附催化剂表面 ,促进了光生电子 -空穴对的分离和转移 .Fe(II)吸附相当微弱 ,这可能是导致Fe(II)难以被表面空穴或其它活性物质重新氧化的原因之一
Ferric ions promoted the photocatalytic degradation of X3B reactive brilliant red dye by TiO2, however, the degradation of X3B did not accelerate after all of Fe (III) was converted to Fe (II) ions. The results showed that Fe ) Capture of surface photogenerated electrons is the main reason for the increase of the rate of degradation of X3B, while the photochemical production of hydroxyl radical by Fe (III) contributes a little to the degradation of X3B.Because of the lack of Fe (III) / Fe (II) (Photo) The Fenton reaction is less likely to participate in the X3B degradation process.X3B and Fe (III) competed with the Fe (III) on the surface of the catalyst to promote the separation and transfer of photogenerated electron-hole pairs. Fe (II) One of the reasons that Fe (II) is hard to be re-oxidized by surface holes or other active materials