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Related Concept Videos

Coagulation01:06

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
Electrodeposition01:08

Electrodeposition

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.
Electrodeposition can...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Electrolysis03:00

Electrolysis

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...
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential ensures...
Colloidal precipitates01:09

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
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A quantitative comparison between electrocoagulation and chemical coagulation for boron removal from boron-containing

A Erdem Yilmaz1, Recep Boncukcuoğlu, M Muhtar Kocakerim

  • 1Atatürk University, Faculty of Engineering, Department of Environmental Engineering, 25240 Erzurum, Turkey. aerdemy@atauni.edu.tr

Journal of Hazardous Materials
|May 26, 2007
PubMed
Summary

Electrocoagulation significantly outperforms chemical coagulation for boron removal. This study demonstrates electrocoagulation achieves 94% boron removal, while chemical coagulation only reaches 24% efficiency.

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Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Chemical Engineering

Background:

  • Boron contamination in water poses environmental and health risks.
  • Conventional chemical coagulation methods show limited effectiveness for boron removal.
  • Developing efficient boron removal techniques is crucial for water purification.

Purpose of the Study:

  • To quantitatively compare the efficacy of electrocoagulation and chemical coagulation for boron removal.
  • To evaluate the performance of both methods under optimized conditions.
  • To determine the optimal parameters for boron removal using electrocoagulation.

Main Methods:

  • Quantitative comparison of electrocoagulation and chemical coagulation processes.
  • Electrocoagulation utilized in situ coagulant generation via sacrificial anode and flotation.
  • Chemical coagulation performed using jar tests with aluminum chloride and settling.
  • Optimized conditions included pH 8.0 and aluminum dose of 7.45 g/L.

Main Results:

  • Electrocoagulation achieved significantly higher boron removal efficiencies compared to chemical coagulation.
  • At optimum conditions, electrocoagulation yielded 94.0% boron removal.
  • Chemical coagulation, under the same conditions, resulted in only 24.0% boron removal.
  • Chemical coagulation demonstrated minimal effectiveness in removing boron from contaminated solutions.

Conclusions:

  • Electrocoagulation is a superior method for boron removal from water.
  • The in situ coagulant generation and flotation mechanism in electrocoagulation enhance boron removal.
  • Further research into electrocoagulation parameters can optimize boron removal processes.