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Related Concept Videos

Electrolysis03:00

Electrolysis

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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...
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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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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...
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Electrochemical Cells01:28

Electrochemical Cells

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Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not...
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Osmosis and Osmotic Pressure of Solutions02:40

Osmosis and Osmotic Pressure of Solutions

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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...
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Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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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.
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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Water Desalination with Wires.

S Porada1,2, B B Sales1,3, H V M Hamelers1

  • 1†Wetsus, Centre of Excellence for Sustainable Water Technology, Agora 1, 8934 CJ Leeuwarden, The Netherlands.

The Journal of Physical Chemistry Letters
|August 20, 2015
PubMed
Summary

This study introduces a novel wire-based capacitive desalination technology. This method efficiently removes salt from brackish water, showing potential for large-scale water treatment applications.

Keywords:
electrostatic double layer theoryion-exchange membranesmicroporous carbon electrodessupercapacitorswater desalination

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Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination
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Area of Science:

  • Environmental Science
  • Materials Science
  • Electrochemistry

Background:

  • Growing global demand for freshwater necessitates innovative water desalination solutions.
  • Existing desalination methods face challenges related to energy consumption and cost.
  • Capacitive deionization (CDI) offers a promising alternative for salt removal.

Purpose of the Study:

  • To investigate the potential of a novel capacitive wire-based technology for water desalination.
  • To evaluate the desalination performance of the wire-based CDI system.
  • To explore methods for enhancing desalination efficiency.

Main Methods:

  • Development of anode/cathode wire pairs with porous carbon electrodes on conductive rods.
  • Implementation of an ion adsorption/desorption cycle by alternately dipping electrodes in freshwater and brine.
  • Experimental testing of the system with brackish water (20 mM salinity).
  • Inclusion of a cation exchange membrane on cathode wires to assess performance enhancement.
  • Theoretical modeling to rationalize experimental findings and predict performance improvements.

Main Results:

  • A desalination factor of 3 was achieved for brackish water within six cycles.
  • The use of a cation exchange membrane increased the desalination factor to 4.
  • Theoretical modeling supported the experimental results and suggested avenues for material modification.
  • A "merry-go-round" operational mode was proposed for treating large water volumes.

Conclusions:

  • The novel capacitive wire-based technology demonstrates significant potential for efficient water desalination.
  • Material modifications and system configurations can further enhance desalination performance.
  • The proposed technology is scalable and suitable for treating large volumes of water.