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首页> 外文期刊>Environmental Science & Technology >Environmental Remediation by an Itegrated Microwave/UV Illumination Technique. 8. Fate of Carboxylic Acids, Aldehydes, Alkoxycarbonyl and Phenolic Substrates in a Microwave Radiation Field in the Presence of TiO{sub}2 Particles under UV Irradiation
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Environmental Remediation by an Itegrated Microwave/UV Illumination Technique. 8. Fate of Carboxylic Acids, Aldehydes, Alkoxycarbonyl and Phenolic Substrates in a Microwave Radiation Field in the Presence of TiO{sub}2 Particles under UV Irradiation

机译：通过集成的微波/紫外线照明技术进行环境修复。 8.紫外线照射下TiO {sub} 2粒子在微波辐射场中羧酸，醛，烷氧羰基和酚醛基质的去向

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Thermal and nonthermal effects originating when a system is subjected to a microwave radiation field in the TiO{sub}2-photocatalyzed transformation of model substances containing various functional groups (e.g., benzoic acid, phthalic acid, o-formylbenzoic acid, phthalaldehyde, succinic acid, dimethyl phthalate, diethyl phthalate, and phenol) have been examined under simultaneous irradiation by ultraviolet (UV) and microwave (MW) radiations. Characteristics of the microwave effects and the fate of each substrate during the microwave-assisted photocatalytic process were monitored by UV absorption spectroscopy, HPLC methods,total organic carbon assays, and identification of intermediates using electrospray mass spectral techniques. Microwave thermal and nonthermal effects were delineated by comparing results from MW-generated internal heat versus conventional external heating, and at constant ambient temperature under a microwave field. Factors involved in the nonthermal component of the microwave radiation were inferred for the initial adsorption of the substrate and its subsequent degradation occurring on the surface of TiO{sub}2 particles. Microwave effects bear on the mechanism through which a model substrate undergoes oxidative degradation. A characteristic feature of these effects was briefly examined by considering the behavior of polar (dipole moments) substrates in a microwave radiation field.
机译：当系统受到TiO {sub} 2-光催化转化含有各种官能团的模型物质（例如苯甲酸，邻苯二甲酸，邻甲酰基苯甲酸，邻苯二甲醛，琥珀酸）的微波辐射场时产生的热和非热效应，邻苯二甲酸二甲酯，邻苯二甲酸二乙酯和苯酚）已在紫外线（UV）和微波（MW）辐射的同时照射下进行了检查。通过紫外吸收光谱，HPLC方法，总有机碳测定以及使用电喷雾质谱技术鉴定中间体来监测微波辅助光催化过程中微波效应的特征和每种底物的命运。通过比较微波产生的内部热量与常规外部加热的结果以及在微波场下恒定的环境温度下，得出微波的热效应和非热效应。推断出与微波辐射的非热成分有关的因素是基材的初始吸附及其随后在TiO {sub} 2颗粒表面发生降解的原因。微波效应影响模型基质发生氧化降解的机理。通过考虑极性（偶极矩）基板在微波辐射场中的行为，简要检查了这些效应的特征。

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