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Kinetics and Mechanism of Photoactivated Periodate Reaction with 4-Chlorophenol in Acidic Solution

机译：酸性溶液中4-氯酚与光敏高碘酸盐反应的动力学及机理

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摘要

The application of photo activated periodate (UV/(IO{sub}){sup}-4) to the degradation of 4-chlorophenol (4-CP) was explored in this study. Under low irradiation intensities (23 μW/cm{sup}2), wavelength of 266 nm, and pH 3, 4-CP was observed to degrade by pseudo-first-order reaction kinetics. The small reduction in 4-CP degradation in the presence of tert-butyl alcohol (f-BuOH) suggests that degradation of 4-CP by UV/(IO{sub}4){sup}- was not dominated by an OH{sub}· pathway. O{sub}3 production was suppressed in the presence of f-BuOH under O{sub}2-limited environments and in the presence of 4-CP. Faster degradation of 4-CP in the presence of an OH{sub}· scavenger under nitrogen purging as compared to air-saturated conditions indicates that O(3{sup left}P) is an important reactive species with 4-CP in this system. When 4-CP is added to the system, (IO{sub}3){sup}- production is enhanced. On the basis of the elimination of potential reaction pathways, O(3{sup left}P) and (IO{sub}3)· are suspected reactive species with 4-CP in this system.
机译：本研究探讨了光活化高碘酸盐（UV /（IO {sub}）{sup} -4）在降解4-氯苯酚（4-CP）中的应用。在低辐照强度（23μW/ cm {sup} 2），266 nm的波长和pH 3的情况下，观察到4-CP通过拟一级反应动力学降解。在叔丁醇（f-BuOH）存在下4-CP降解的小幅降低表明，UV /（IO {sub} 4）{sup}-降解4-CP的过程不是OH {sub }·途径。在O {sub} 2受限的环境下，在f-BuOH存在下，在4-CP存在下，O {sub} 3的产生受到抑制。与空气饱和条件相比，在氮吹扫下存在OH {sub}·清除剂的情况下，4-CP的降解速度更快，这表明O（3 {sup left} P）是该系统中4-CP的重要反应物种。将4-CP添加到系统后，（IO {sub} 3）{sup}-的生产将得到增强。在消除潜在的反应途径的基础上，O（3 {sup left} P）和（IO {sub} 3）·被怀疑是该系统中带有4-CP的反应性物种。

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