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Electrolysis03:00

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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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Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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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...
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Spontaneous Chemical Reactions
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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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A zero-liquid-discharge scheme for vanadium extraction process by electrodialysis-based technology.

Meng Wang1, Hong-Bo Xing1, Yu-Xiang Jia1

  • 1Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.

Journal of Hazardous Materials
|July 25, 2015
PubMed
Summary

This study introduces a hybrid electrodialysis and cooling crystallization process for zero-discharge vanadium extraction wastewater treatment. The method effectively recovers water and produces high-purity sodium sulfate crystals.

Keywords:
Concentration ratioIndustrial saline waterVanadium extractionWater transportZero-liquid-discharge

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Area of Science:

  • Environmental Chemistry
  • Chemical Engineering
  • Materials Science

Background:

  • Rising vanadium demand necessitates efficient wastewater treatment from extraction processes.
  • Conventional methods struggle with environmental discharge regulations.
  • Zero-discharge solutions are critical for sustainable vanadium production.

Purpose of the Study:

  • To evaluate the feasibility of a hybrid electrodialysis-cooling crystallization process for zero-discharge vanadium extraction.
  • To investigate the impact of membrane types and operating parameters on electrodialysis performance.
  • To optimize water recovery and sodium sulfate byproduct concentration.

Main Methods:

  • A hybrid process combining electrodialysis (ED) and cooling crystallization.
  • Systematic study of ED performance under varying membrane types and operating conditions.
  • Analysis of water transport mechanisms (osmosis, electro-osmosis) and their relation to current density.

Main Results:

  • Electrodialysis performance is significantly influenced by membrane selection and operating parameters.
  • Water transport mechanisms are dependent on applied current density.
  • Increased current density and reduced water-to-salt flux ratio enhance concentration.
  • High concentration ratios can decrease current efficiency and increase energy consumption.

Conclusions:

  • The hybrid ED-crystallization scheme offers a viable zero-discharge solution for vanadium extraction wastewater.
  • Recovered water exhibits low salt content, suitable for reuse.
  • Highly concentrated sodium sulfate solutions (up to 300 g/L) are achievable, facilitating high-purity crystal production.