Study on the mechanism of methylene blue degradation by TiO2 photocatalyst
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摘要: 进行了亚甲基蓝光解、吸附及光催化对比实验,以及OH清除剂叔丁醇、电子空穴对(e- ,h+ )结合抑制剂过氧化氢、空穴(h+ VB)清除剂碘化钾、单线态氧(1O2)清除剂叠氮钠、超氧自由基(O-2)清除剂苯醌对TiO2光催化降解亚甲基蓝降解率的影响实验,同时测定了光催化反应过程中H2O2的生成,证明了TiO2光催化降解亚甲基蓝体系中主要活性氧形态为OH,O-2和1O2 .Abstract: In order to carry out the study, the experiments of photodegradation of methylene blue under different conditions were conducted, using different kinds of free radical scavengers, such as (CH3)3OH, H2O2, KI, NaN3 and C6H4O2. The effects of these free radical scavengers were observed. The concentration of H2O2 generated during the photodegradation of methylene blue by TiO2 was also reported. And the results of these experiments indicated that the main active oxygen substances in the reaction are OH, O-2 and 1O2.
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Key words:
- methylene blue /
- TiO2 /
- photocatalytic degradation /
- free radical scavenging /
- ROS
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