不同纳米过膜的Mg2+-Li+分离的比较
Tingting Li1, Yueyu Liu1, Chandrasekar Srinivasakannan2
1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
Membranes
|September 27, 2023
概括
这项研究探讨了纳米过技术,以从盐水中分离和. 在最佳条件下,可以实现低保留率 (5.17%) 和降低与比率 (0.088) 在透物中.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 盐湖盐水是和等有价值离子的重要来源.
- 有效地分离 (Mg2+) 和 (Li+) 对于资源回收至关重要.
- 现有的分离方法在选择性和效率方面面临挑战.
研究的目的:
- 研究纳米过的应用,从复杂的盐湖盐水中分离Mg2+-Li+.
- 为了评估四种不同的纳米过膜 (DL,DK,NF-270,NF-90) 的性能.
- 确定最佳的操作条件,以最大限度地提高分离效率.
主要方法:
- 使用了四种不同的纳米过膜来处理盐水,其中含有高Mg2+-Li+比率 (61).
- 评估稀释系数,工作压力,循环速率和料pH对离子保留的影响.
- 在不同条件下分析了Mg2+和Li+的保留效率和分离因子.
主要成果:
- (Ca2+) 对Mg2+-Li+的保留有微不足道的影响.
- (Na+) 和 (K+) 离子与Li+竞争,由于它们的水化半径和扩散系数,影响了分离.
- 最佳条件 (稀释系数:40,压力1.2 MPa,流速:500 L/h,pH:7) 导致5.17%的Li+保留和降低了Mg2+-Li比率0.088的透物.
结论:
- 纳米过是一种可行的技术,可以从盐湖盐水中分离Mg2+-Li+.
- 膜性能受到操作参数和其他离子的存在的影响.
- 实现了Mg2+-Li+比率的显著降低,表明回收的潜力.
更多相关视频
相关概念视频
01:09Ion-Exchange Chromatography
573
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
573
01:17Ion Exchange
617
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...
617
00:56Extraction: Advanced Methods
481
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...
481
01:15Dialysis
728
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
728
01:30Capillary Electrophoresis: Applications
427
Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
427
01:08Size-Exclusion Chromatography
635
In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
Silica particles offer advantages such as rigidity,...
635