相关实验视频
Updated: Jul 2, 2025
06:00
Determination of the Settling Rate of Clay/Cyanobacterial Floccules
Published on: June 11, 2018
6.9K
在混合溶液条件下粘土的膜行为
Zhihong Zhang1, Haowen Yang1, Zhaoyang Song1
1Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China.
The Science of the total environment
|February 25, 2024
概括
压缩的粘土粘土.
科学领域:
- 地质技术工程 地质技术工程
- 环境科学 环境科学
- 土壤科学 土壤科学
背景情况:
- 压缩的粘土作为一个重要的缓冲材料在垃圾填埋场,管理水离子迁移.
- 目前的膜测试通常使用单溶液溶液,不反映复杂的液条件.
- 在混合离子溶液下评估压缩粘土的屏障特性对于垃圾填埋安全至关重要.
研究的目的:
- 在各种混合离子溶液下评估本托尼特修改土壤的膜效率.
- 通过核磁共振 (NMR) 测试来研究影响膜行为的微机制.
- 了解不同的阴离子混合比如何影响压缩粘土的屏障性能.
主要方法:
- 使用KCl-NaCl,KCl-CaCl2和KCl-AlCl3混合溶液 (总度为20毫米) 进行了13次膜试验.
- 在土壤样本上利用核磁共振 (NMR) 测试进行了后膜测试.
- 分析了不同阴离子混合比对膜效率和土壤微观结构的影响.
主要成果:
- 膜效率随着较高的Na+比率而增加,但随着较高的Ca2+或Al3+比率而下降.
- 纯AlCl3溶液在所有测试条件中产生了最低的膜效率.
- 核磁共振试验证实,增加的离子价值与减少的扩散双层厚度和增加的宏孔比例相关.
结论:
- 液的阳离子组成显著影响压缩粘土的膜效率.
- 单价离子 (Na+) 增强了屏障特性,而双价 (Ca2+) 和三价 (Al3+) 离子降低了它们.
- 微观结构的变化,包括扩散的双层厚度和巨孔含量,解释了观察到的膜行为.
相关概念视频
01:23Membrane Fluidity
152.3K
Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
152.3K
02:42Aqueous Solutions and Heats of Hydration
14.7K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
14.7K
03:24Common Ion Effect
41.7K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
41.7K
03:00Solubility
17.5K
Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
17.5K
03:13Intermolecular Forces
58.3K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.3K
01:17Colloids and Suspensions
1.8K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
1.8K