Preparation, characterization and intercalation mechanism of bentonite modified with different organic ammonium

IF 4.1 2区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Science Pub Date : 2024-09-21 DOI:10.1016/j.ces.2024.120758

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Abstract

Three organic ammoniums with different molecular configurations were selected to modify Ca-bentonite and Na-bentonite. The FTIR spectra, SEM images and XRD diagrams of bentonite before and after modification were compared. The adsorption performance of bentonite samples for Hg(II) ions was contrasted. The results indicate that the more complex the molecular configuration of organic ammonium, the greater the steric hindrance, and the more difficult it is to insert into the interlayer space. The chelation between the functional groups contained in organic ammonium and the interlayer cations in bentonite is unfavorable for organic ammonium molecules to enter the interlayer space. Some organic ammonium molecules that cannot enter the interlayer space can adhere to the surface of bentonite particles through interaction with functional groups on the particle surface or through electrostatic interactions and hydrogen bonding forces, forming nanocomposites. Thereby, the adsorption performance of benonite samples modified with organic ammonium for Hg(II) ions improved.

Abstract Image

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不同有机铵改性膨润土的制备、表征和插层机理

选择了三种不同分子结构的有机铵来改性钙基膨润土和钠基膨润土。比较了改性前后膨润土的傅立叶变换红外光谱、扫描电镜图像和 X 射线衍射图。对比了膨润土样品对 Hg(II) 离子的吸附性能。结果表明，有机铵的分子构型越复杂，立体阻碍越大，越难插入层间空间。有机铵所含官能团与膨润土中的层间阳离子之间的螯合作用不利于有机铵分子进入层间空间。一些无法进入层间空间的有机铵分子可以通过与膨润土颗粒表面的官能团相互作用或通过静电作用和氢键作用力附着在膨润土颗粒表面，形成纳米复合材料。因此，用有机铵改性的膨润土样品对 Hg(II) 离子的吸附性能得到了改善。

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来源期刊

Chemical Engineering Science 工程技术-工程：化工

CiteScore

7.50

自引率

8.50%

发文量

1025

审稿时长

50 days

期刊介绍： Chemical engineering enables the transformation of natural resources and energy into useful products for society. It draws on and applies natural sciences, mathematics and economics, and has developed fundamental engineering science that underpins the discipline. Chemical Engineering Science (CES) has been publishing papers on the fundamentals of chemical engineering since 1951. CES is the platform where the most significant advances in the discipline have ever since been published. Chemical Engineering Science has accompanied and sustained chemical engineering through its development into the vibrant and broad scientific discipline it is today.