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高岭土对十二烷基苯磺酸钠的吸附行为及高岭土的结构变化

The adsorptive behaviour of kaolinite to sodium dodecyl benzene sulphonate and the structural variation of kaolinite.

作者信息

Ni Xiaoming, Zhao Zheng, Li Zhiheng, Li Quanzhong

机构信息

School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454000, China.

Mining Engineering Department, Shanxi Institute of Technology, Yangquan, 045000, China.

出版信息

Sci Rep. 2021 Jan 19;11(1):1796. doi: 10.1038/s41598-021-81283-8.

DOI:10.1038/s41598-021-81283-8
PMID:33469086
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7815721/
Abstract

Analysis of the adsorptive behaviour of kaolinite to sodium dodecyl benzene sulphonate (SDBS) at different concentrations can provides a basis for selecting the best concentration. The adsorptive capacity and adsorptive behaviour of kaolinite to SDBS at different concentrations were studied using ultraviolet spectrophotometer, pseudo-first-order adsorption kinetics model, and pseudo-second-order adsorption kinetics model. Scanning electron microscopy with energy dispersive spectrometry (SEM-EDS), X-ray diffraction (XRD), and infrared spectroscopy (FTIR) were used to study the variation characteristics of surface structure, crystallinity indices, and main functional groups on kaolinite before, and after, adsorption. The results show that as the SDBS concentration increase, the adsorptive capacity of kaolinite to SDBS increase. The adsorption process can be accurately fitted by the pseudo-secondary adsorption kinetic model, which means the adsorptive behaviour was mainly chemical in origin. The adsorption of SDBS by kaolinite mainly occurs on the surface. The solidification, lamellar aggregation, and crystallinity index of kaolinite are more obvious after the adsorption of SDBS, but the interlayer spacing of kaolinite did not change to any significant. After the adsorption of SDBS, the intensity ratio of 1000-1008 cm bands changed significantly, indicating the change of the chemical environment, and the adsorptive behaviour was chemical.

摘要

分析不同浓度下高岭土对十二烷基苯磺酸钠（SDBS）的吸附行为可为选择最佳浓度提供依据。利用紫外分光光度计、准一级吸附动力学模型和准二级吸附动力学模型研究了不同浓度下高岭土对SDBS的吸附容量和吸附行为。采用扫描电子显微镜-能谱仪（SEM-EDS）、X射线衍射（XRD）和红外光谱（FTIR）研究了高岭土吸附前后表面结构、结晶度指数和主要官能团的变化特征。结果表明，随着SDBS浓度的增加，高岭土对SDBS的吸附容量增加。吸附过程可用准二级吸附动力学模型精确拟合，这意味着吸附行为主要源于化学作用。高岭土对SDBS的吸附主要发生在表面。SDBS吸附后，高岭土的固化、层状聚集和结晶度指数更为明显，但高岭土的层间距没有明显变化。SDBS吸附后，1000 - 1008 cm波段的强度比发生显著变化，表明化学环境发生了变化，吸附行为是化学性的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/cbfd749d6fd6/41598_2021_81283_Fig8_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/7671400ab611/41598_2021_81283_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/2ef7c9947d01/41598_2021_81283_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/aea12b559aff/41598_2021_81283_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/cbfd749d6fd6/41598_2021_81283_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/a599442172f1/41598_2021_81283_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/d870a087014e/41598_2021_81283_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/52033c2f0f07/41598_2021_81283_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/dbb9bfb63e0e/41598_2021_81283_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/7671400ab611/41598_2021_81283_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/2ef7c9947d01/41598_2021_81283_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/aea12b559aff/41598_2021_81283_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab65/7815721/cbfd749d6fd6/41598_2021_81283_Fig8_HTML.jpg

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