Related Experiment Video
Updated: Mar 21, 2026
07:45
Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
Published on: August 16, 2018
10.5K
Seawater Pervaporation through Zeolitic Imidazolate Framework Membranes: Atomistic Simulation Study.
Krishna M Gupta1, Zhiwei Qiao1, Kang Zhang1
1Department of Chemical and Biomolecular Engineering, National University of Singapore , 117576, Singapore.
ACS Applied Materials & Interfaces
|May 20, 2016
Summary
Atomistic simulations show zeolitic imidazolate framework (ZIF) membranes achieve 100% salt rejection for seawater pervaporation. ZIF-100 exhibits superior water permeability, highlighting its potential for efficient desalination.
Area of Science:
- Materials Science
- Chemical Engineering
- Computational Chemistry
Background:
- Pervaporation is a promising membrane technology for seawater desalination.
- Zeolitic imidazolate frameworks (ZIFs) offer tunable properties for membrane applications.
- Understanding water transport mechanisms in ZIFs is crucial for optimizing desalination performance.
Purpose of the Study:
- To investigate the performance of five ZIF membranes (ZIF-8, -93, -95, -97, -100) for seawater pervaporation using atomistic simulations.
- To elucidate the relationship between ZIF structure, hydrophobicity, and water transport properties.
- To identify key factors governing salt rejection and water permeability.
Main Methods:
- Atomistic simulations were employed to model seawater pervaporation.
- The study analyzed salt rejection, water permeability, and water molecule dynamics within different ZIF structures.
- Framework hydrophobicity/hydrophilicity and aperture size were key parameters investigated.
Main Results:
- All five ZIF membranes demonstrated 100% salt rejection.
- ZIF-100, with the largest aperture, exhibited the highest water permeability (5 × 10⁻⁴ kg m/(m² h bar)).
- Water flux in ZIF-8, -93, -95, and -97 was influenced by framework hydrophobicity, with hydrophobic ZIF-8 and -95 showing higher flux than hydrophilic ZIF-93 and -97.
Conclusions:
- ZIF membranes show excellent potential for seawater desalination with high salt rejection and tunable water permeability.
- Aperture size and framework hydrophobicity/hydrophilicity are critical factors determining water transport in ZIF membranes.
- ZIF-100 is identified as a highly promising membrane candidate for efficient seawater pervaporation due to its superior water permeability.
Related Concept Videos
01:25Aquaporins
6.9K
Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
6.9K
01:15Dialysis
2.1K
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...
2.1K
02:40Osmosis and Osmotic Pressure of Solutions
48.5K
A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
48.5K
01:18Detergent Purification of Membrane Proteins
6.8K
Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
6.8K
01:15Potentiometry: Membrane Electrodes
2.2K
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...
2.2K