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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Direct Experimental Evidence for a Heterogeneous Reaction of Ozone with Bromide at the Air-Aqueous Interface
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Direct Experimental Evidence for a Heterogeneous Reaction of Ozone with Bromide at the Air-Aqueous Interface

机译：臭氧与溴化物在气-水界面上的多相反应的直接实验证据

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Recent experimental and theoretical evidence has indicated an enhancement of the heavier halide ions at the air-aqueous interface,relative to their bulk concentrations.This,along with an order of magnitude discrepancy between measured and predicted Br2 production in the reaction of ozone with deliquesced NaBr aerosol,has led to the suggestion that an interface reaction occurs between ozone and bromide.We have used harmine,a beta-carboline alkaloid,as an interface-sensitive fluorescent pH probe in order to measure pH changes associated with the interfacial reaction of ozone and bromide.The rate of pH change depends upon the bulk bromide concentration in a way which is well described by a Langmuir-Hinshelwood kinetic model.In the presence of octanol at the interface,the rate of pH change tracks the octanol adsorption isotherm,as expected if octanol enhances the concentration of ozone at the surface.
机译：最近的实验和理论证据表明，相对于其体积浓度，空气-水界面处的重卤离子有所增强。这与臭氧与潮解性NaBr反应中测量到的和预测的Br2产生之间存在数量级的差异。气雾剂导致了臭氧和溴化物之间发生界面反应的建议。我们使用了β-咔啉生物碱harmine作为界面敏感的荧光pH探针，以测量与臭氧和溴的界面反应有关的pH变化。 pH的变化速率取决于朗格缪尔-辛塞尔伍德动力学模型很好地描述的方式，取决于体积溴化物的浓度。在界面处存在辛醇的情况下，pH的变化速率符合预期的辛醇吸附等温线。辛醇是否会提高表面臭氧的浓度。

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