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首页> 外文期刊>Journal of Photochemistry and Photobiology, A. Chemistry >Environmental remediation by an integrated microwave/UV illumination technique IX.Peculiar hydrolytic and co-catalytic effects of platinum on the TiO2 photocatalyzed degradation of the 4-chlorophenol toxin in a microwave radiation field
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Environmental remediation by an integrated microwave/UV illumination technique IX.Peculiar hydrolytic and co-catalytic effects of platinum on the TiO2 photocatalyzed degradation of the 4-chlorophenol toxin in a microwave radiation field

机译：集成的微波/紫外线照明技术对环境的修复IX。铂在微波辐射场中对TiO2光催化降解4-氯苯酚毒素的特殊水解和助催化作用

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摘要

The photocatalyzed degradation of the 4-chlorophenol toxin (4-CP) in aqueous naked TiO_2 and platinized TiO_2 suspensions simultaneously subjected to UV light and microwave radiation was revisited to examine the fate of this toxin in the microwave-assisted photocatalytic process by monitoring loss of total organic carbon (TOC;mineralization),formation of chloride ions (dechlorination of 4-CP),and identification of intermediates using HPLC and electrospray mass spectral (LC-MSD) techniques.Attempts are made to delineate microwave thermal and nonthermal factors that impinge on the degradation by comparing experimental results from microwave-generated heat versus results from a conventional (externally heated) thermally-assisted process,and from results in which the thermal factors were minimized by examining the degradative process at constant ambient temperature (25 deg C).Possible microwave radiation effects on the Pt co-catalyst supported on TiO_2 were also probed through comparison of the degradation of 4-CP occurring on Pt/TiO_2 and on naked TiO2 photocatalysts.Results suggest that,in a microwave radiation field,naked TiO_2 and Pt/TiO_2 particle surfaces interact with the microwaves.The degradation pathway exhibited characteristics of hydrolysis of reactants and intermediates.Nonthermal microwave effects play a role in the overall degradative process occurring in platinized TiO_2 dispersions.The possible nature of these unusual microwave effects is briefly discussed.
机译：考察了同时暴露于紫外光和微波辐射下的裸露TiO_2水溶液和镀铂TiO_2悬浮液中4-氯苯酚毒素（4-CP）的光催化降解，以监测该毒素在微波辅助光催化过程中的命运。总有机碳（TOC;矿化），氯离子的形成（4-CP的脱氯）以及使用HPLC和电喷雾质谱（LC-MSD）技术鉴定中间体的方法。尝试描绘影响微波的热和非热因素比较微波产生的热实验结果与常规（外部加热）热辅助过程的实验结果，并通过在恒定的环境温度（25摄氏度）下检查降解过程使热因子最小化的结果通过比较，还探讨了微波辐射对负载在TiO_2上的Pt助催化剂的影响。结果表明，在微波辐射场中，裸露的TiO_2和Pt / TiO_2粒子表面与微波相互作用，降解途径表现出反应物的水解特性。结果表明，Pt / TiO_2和裸露的TiO2光催化剂上发生的4-CP降解。非热微波效应在镀铂的TiO_2分散体的整个降解过程中起作用。简要讨论了这些异常微波效应的可能性质。

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