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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Interaction of Cr~(3+) with Silica Gel at the Aqueous Interface Using Fluorescence in Sodium Dodecyf Sulfate Micelles and Confocal Fluorescence Microscopy
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Interaction of Cr~(3+) with Silica Gel at the Aqueous Interface Using Fluorescence in Sodium Dodecyf Sulfate Micelles and Confocal Fluorescence Microscopy

机译：十二烷基硫酸钠胶束中荧光和共聚焦荧光显微镜观察Cr〜（3+）与硅胶在水界面上的相互作用

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摘要

Chemical composition and species distribution in clay surfaces are key factors which control sorption and desorption processes of Cr~(3+) between sediment and water. Adsorption of Cr~(3+) on silica gel has been studied by following the quenching of naphthalene fluorescence in aqueous sodium dodecyl sulfate (SDS) micelles, which concentrate naphthalene and Cr~(3+) in the micellar surface. Adsorption for pH < 5 follows a Langmuir model, and experimental data fitting is successRilly described by a model based on discrete sites on the surface with variablecharge as a function of pH. Probably the mechanism of Cr~(3+) adsorption at the silica gel surface is predominantly electrostatic, with outer-sphere complexation and ion exchange with adsorbed H~+ ions. Confocal laser-scanning fluorescence microscopy measurements reveal the Cr~(3+) spatial distribution in three dimensions. Specifically, both images and spectra measured with confocal microscopy indicate that Cr~(3+) is distributed across the entire particle, not just adsorption at the surface.
机译：粘土表面的化学组成和物种分布是控制沉积物与水之间Cr〜（3+）吸附和解吸过程的关键因素。通过在十二烷基硫酸钠（SDS）胶束中萘荧光的猝灭研究了Cr〜（3+）在硅胶上的吸附，该胶束使萘和Cr〜（3+）集中在胶束表面。 pH <5的吸附遵循Langmuir模型，实验数据拟合成功，Rilly通过基于表面上离散位点的模型描述了该模型，其中可变电荷是pH的函数。 Cr〜（3+）吸附在硅胶表面的机理可能主要是静电，外层络合以及与吸附的H〜+离子发生离子交换。共聚焦激光扫描荧光显微镜测量揭示了Cr〜（3+）在三个维度上的空间分布。具体地说，用共聚焦显微镜测量的图像和光谱都表明Cr〜（3+）分布在整个粒子上，而不仅仅是在表面的吸附。

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