消除pH的影响:双矩阵调制吸收剂可从缩的海水中有效地提取
Yu Han1, Liuqian An1, Yan Yang1
1State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
Water research
|October 9, 2024
概括
这项研究引入了一种新型的双矩阵吸附剂,可以增强从液体资源中提取的效果. 这种新材料有效地克服了与pH值相关的挑战,提高了离子的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 离子的吸附剂对于从液体资源中提取至关重要,因为它们的效率和成本效益.
- 这些材料的吸附性能受到环境pH值变化的显著阻碍,影响了杂质离子竞争和表面电荷.
- 现有的吸附剂经常在不同的pH条件下与性能波动作斗争.
研究的目的:
- 为离子网开发一种新的双矩阵调制吸附剂.
- 为了减轻pH对吸附效率和选择性的负面影响.
- 在不同的环境条件下提高离子的稳定性和性能.
主要方法:
- 合成了一种双矩阵吸附剂,将载体矩阵与zwitterionic四分位氨基基基结合,并将吸附矩阵与炭化.
- 采用Zwitterionic四级基来通过酸反应中和竞争的杂质离子.
- 加入了碳基组以最大限度地降低表面泽塔电位差异,稳定了跨pH范围的吸附.
主要成果:
- 双矩阵调制吸附剂在自然条件下显著提高了吸附能力 (28 mg/g) 和选择性 (α(Li+/Mg2+) =24.23),表现优于基于的吸附剂 (HMO).
- 与HMO相比,在自然条件下的性能在和吸附能力上是6.3倍高,在选择性上是7.8倍高.
- 吸附剂在性条件下与HMO保持一致的性能,表明pH值独立的效率.
结论:
- 开发的双矩阵调制有效地消除了pH对离子网吸附过程的有害影响.
- 这种方法为提高提取效率和在各种液体资源中的选择性提供了一个强大的解决方案.
- 通过双矩阵调制优化吸附条件为更可靠,更高效的回收技术铺平了道路.
相关概念视频
00:56Extraction: Advanced Methods
429
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
429
01:17Ion Exchange
560
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
560
04:01Factors Affecting Solubility
33.2K
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 Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.2K
01:15Potentiometry: Membrane Electrodes
476
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
476
01:17Controlled-Potential Coulometry: Electrolytic Methods
145
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
The chosen potential...
145
01:09Analyte Adsorption and Distribution
613
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
613