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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Adsorption of Iodine Species (I-3(-), I-, and IO3-) at the Nuclear Paint Monolayer-Water Interface and Its Relevance to a Nuclear Accident Scenario
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Adsorption of Iodine Species (I-3(-), I-, and IO3-) at the Nuclear Paint Monolayer-Water Interface and Its Relevance to a Nuclear Accident Scenario

机译：在核涂料单层水界面的碘类（I-3（ - ），I-和IO3-）的吸附及其与核事故情景的相关性

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摘要

Following a nuclear accident, radioactive iodine causes great concern to public health and safety. Organic iodide, because of its ability to escape reactor containment building and high environmental mobility, constitutes a predominant fraction of airborne radioiodine at places far away from the accident site. As the iodine released from a reactor core is inorganic iodine, it is vital to understand the mechanism of organic iodide formation inside reactor containment. In this context, we investigated the surface prevalence and adsorption of various inorganic iodines, I-, I-3(-), and IO3-, at a nuclear paint (used in nuclear installations) monolayer-water interface, mimicking the painted inner walls of an accident-affected containment building that are exposed to the iodine-containing condensed water layer. Vibrational sum frequency generation (VSFG) measurements in the OH and CH stretch regions reveal that the paint-water interface changes its charge characteristics with the pH of the water that affects the degree of interaction with the iodine species. At the acidic condition (bulk pH < 7), the paint becomes positively charged and strongly adsorbs the negatively charged iodine species dissolved in the aqueous phase, whereas at the alkaline condition (bulk pH > 9.5), the paint becomes net neutral and weakly interacts with the iodine species. These interactions change the conformation of the paint such that its hydrophobic alkyl groups orient increasingly away from the aqueous phase. The order of adsorption increases as IO3- < I- < I-3(-) for the different iodine species studied.
机译：在核事故之后，放射性碘对公共卫生和安全产生了极大的关注。有机碘化物，由于其逃避反应堆遏制建筑和高环境流动性的能力，构成了远离事故部位的地方的空气载体放射性碘的主要部分。由于从反应器核释放的碘是无机碘的碘，因此了解反应器壳内有机碘化物形成的机理至关重要。在这种情况下，我们调查了各种无机碘，I-，I-3（ - ）和IO3 - ，在核涂料（用于核设施）单层水界面，模仿涂漆的内壁的表面普及和吸附发生在含碘冷凝水层的意外受影响的容器建筑物。 OH和CH拉伸区域中的振动和频率产生（VSFG）测量揭示了涂料 - 水界面随着影响与碘类相互作用的水的pH改变其电荷特性。在酸性条件下（体积pH <7），涂料变得带正电荷，强烈地吸附溶解在水相中的带负电荷的碘物质，而在碱性条件下（散装pH> 9.5），涂料变为净中性，弱相互作用含碘物种。这些相互作用改变了涂料的构象，使得其疏水性烷基越来越远离水相。吸附顺序随着所研究的不同碘类物种的IO3-

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