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Related Concept Videos

Ion Exchange01:17

Ion Exchange

546
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...
546
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.3K
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...
14.3K
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

62.2K
Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
62.2K
Precipitation of Ions03:11

Precipitation of Ions

27.6K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
27.6K
Ionic Strength: Overview01:12

Ionic Strength: Overview

1.3K
The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
1.3K
Electrolysis03:00

Electrolysis

26.0K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.0K

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Updated: Jun 4, 2025

Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Polyanionic Electrolyte Ionization Desalination Empowers Continuous Solar Evaporation Performance.

Fengyong Lv1, Jie Miao1,2, Zhongyu Wang1

  • 1School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai, 201418, China.

Advanced Materials (Deerfield Beach, Fla.)
|December 18, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a new graphene oxide solar evaporator with polyanionic electrolyte functionalization for efficient and durable freshwater production from saline water. The innovative design enhances salt resistance and prevents crystallization, enabling long-term, high-performance desalination.

Keywords:
Donnan equilibrium effectionization desalinationpolyanionic electrolyte functionalizationsolar interfacial evaporationsuperhydrophilic hierarchical metal copper foam evaporator

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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Chemical Engineering

Background:

  • Solar evaporation offers a sustainable method for freshwater production from seawater and wastewater.
  • Traditional solar evaporators suffer from poor salt resistance and corrosion, limiting their practical application in high-salinity environments.
  • Developing durable and efficient solar desalination technologies is crucial for addressing global water scarcity.

Purpose of the Study:

  • To develop a novel solar evaporator with enhanced salt resistance and long-term stability for efficient desalination.
  • To investigate the effectiveness of polyanionic electrolyte functionalization in preventing salt crystallization and improving evaporator performance.
  • To demonstrate a sustainable and cost-effective solution for producing freshwater from saline sources.

Main Methods:

  • Fabrication of a 3D superhydrophilic graphene oxide solar evaporator.
  • Functionalization of the evaporator using a layer-by-layer static deposition of polystyrene sodium sulfonate (a polyanionic electrolyte).
  • Utilizing the Donnan equilibrium effect to regulate ion flux and minimize salt crystallization.
  • Testing the evaporator's performance in brine (15‰ salinity) and natural seawater (9‰ salinity) under solar irradiation.

Main Results:

  • Achieved stable evaporation rates of up to 1.68 kg m⁻² h⁻¹.
  • Demonstrated long-term operation: up to 10 days in brine and 3 days in seawater.
  • Maintained high evaporation efficiencies of approximately 90%.
  • Successfully hindered local salt crystallization through polyanionic electrolyte functionalization.

Conclusions:

  • Polyanionic electrolyte functionalization is a highly effective strategy for enhancing the salt resistance and durability of solar evaporators.
  • The developed graphene oxide evaporator offers excellent and stable desalination performance, paving the way for practical solar-powered water purification.
  • This approach holds significant potential for advancing sustainable seawater desalination and wastewater treatment technologies.