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首页> 美国卫生研究院文献>Frontiers in Chemistry >Adsorption Characteristics of Anionic Surfactant Sodium Dodecylbenzene Sulfonate on the Surface of Montmorillonite Minerals
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Adsorption Characteristics of Anionic Surfactant Sodium Dodecylbenzene Sulfonate on the Surface of Montmorillonite Minerals

机译：阴离子表面活性剂十二烷基苯磺酸钠在蒙脱石矿物表面的吸附特性

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The adsorption characteristics of sodium dodecylbenzene sulfonate (SDBS) on the surface of montmorillonite can lay a foundation for obtaining the optimum concentration of the anionic surfactant. The best absorption wavelength of SDBS was determined using an ultraviolet spectrophotometer. The standard curves of concentration and absorbance of SDBS were established. The amount of SDBS adsorbed on the surface of montmorillonite at various concentrations was calculated by stirring adsorption method. Scanning electron microscopy–energy dispersive X-ray spectrometry (SEM-EDS), X-ray diffraction (XRD), zeta potentiometer, and Fourier transform infrared (FTIR) spectroscopy were used to observe the changes of the structure, main ions, interlayer spacing, potential, and main functional groups on the montmorillonite surface before, and after, adsorption. The test results of SEM with EDS (SEM–EDS) showed that the surface of the montmorillonite after SDBS adsorption was rougher, and the adsorption capacity of the surface was enhanced as the SDBS concentration increased. The XRD results indicated that SDBS adsorbed on the interlayer of montmorillonite repulsed interlayer water and reduced the interlayer water content. With the increase of SDBS concentration, the interlayer spacing of the montmorillonite available for adsorbing SDBS decreased further. Additionally, interlayer adsorption and surface adsorption exist simultaneously in montmorillonite in SDBS solution. The distribution of total adsorption capacity of SDBS in the layers and on the surface of montmorillonite accords with the adsorption result simulated by a pseudo-second-order kinetic model. The increase in concentration of SDBS adsorbed by montmorillonite is the main reason for the decreased initial adsorption rate. The zeta potential test showed that the addition of H+ to the SDBS solution could reduce electrostatic repulsion and promote the adsorption of SDBS on montmorillonite. The results of this study provide an experimental basis for the study of the mechanism of SDBS adsorption on montmorillonite.
机译：十二烷基苯磺酸钠（SDBS）在蒙脱土表面的吸附特性可为获得最佳阴离子表面活性剂浓度奠定基础。 SDBS的最佳吸收波长是用紫外分光光度计测定的。建立了SDBS浓度和吸光度的标准曲线。通过搅拌吸附法算出各种浓度的蒙脱石表面吸附的SDBS量。扫描电子显微镜-能量色散X射线光谱法（SEM-EDS），X射线衍射（XRD），ζ电位计和傅里叶变换红外（FTIR）光谱用于观察结构，主离子，层间距的变化，吸附前后蒙脱石表面的电位，主要官能团和主要官能团。用EDS进行的SEM测试结果（SEM–EDS）表明，SDBS吸附后的蒙脱土表面较粗糙，且随着SDBS浓度的增加，蒙脱土的吸附能力增强。 XRD结果表明，SDBS吸附在蒙脱土层间，排斥层间水，降低了层间水含量。随着SDBS浓度的增加，可用于吸附SDBS的蒙脱土的层间间距进一步减小。此外，蒙脱石在SDBS溶液中同时存在层间吸附和表面吸附。 SDBS在蒙脱土层中和表面的总吸附容量分布与拟二级动力学模型模拟的吸附结果吻合。蒙脱石吸附的SDBS浓度增加是初始吸附速率降低的主要原因。 Zeta电位测试表明，向SDBS溶液中添加H + 可以减少静电排斥，并促进SDBS在蒙脱土上的吸附。研究结果为SDBS吸附蒙脱土的机理提供了实验依据。

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