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Electrodeposition01:08

Electrodeposition

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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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Precipitation and Co-precipitation01:17

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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...
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Controlled-Current Coulometry: Overview01:27

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Coagulation01:06

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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...
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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.
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Updated: Dec 25, 2025

Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability
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Copper (II) removal in a column reactor using electrocoagulation: Parametric optimization by response surface

Qazi Shabihul Mateen1, Saif Ullah Khan1, Dar Tafazul Islam2

  • 1Department of Civil Engineering, Zakir Husain College of Engineering & Technology, Aligarh Muslim University, Aligarh, UP, India.

Water Environment Research : a Research Publication of the Water Environment Federation
|March 22, 2020
PubMed
Summary

Electrocoagulation using iron electrodes effectively removes copper (Cu II) from water. Optimization achieved 95% removal efficiency with reduced energy consumption, offering a cost-effective water treatment solution.

Keywords:
central composite designcopper removalelectrocoagulation processenergy consumptionresponse surface methodology

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Electrochemistry

Background:

  • Copper (Cu II) contamination in aqueous solutions poses environmental and health risks.
  • Conventional water treatment methods for heavy metal removal can be inefficient or costly.
  • Electrocoagulation (EC) presents a potential alternative for effective heavy metal remediation.

Purpose of the Study:

  • To investigate the efficiency of electrocoagulation for copper removal from aqueous solutions.
  • To optimize process parameters influencing copper removal efficiency and energy consumption.
  • To evaluate the kinetics and practical applicability of the electrocoagulation process for copper remediation.

Main Methods:

  • Application of electrocoagulation using iron electrodes in a cylindrical reactor.
  • Utilizing a four-factorial central composite design (CCD) based on response surface methodology (RSM) for process optimization.
  • Kinetic studies to determine the best-fit model for copper removal rate.

Main Results:

  • Maximum removal efficiency of 95% for Cu (II) was achieved.
  • Optimized energy consumption was 0.903 W-hour per gram of Cu (II) removed.
  • Optimal conditions included a current of 0.26 A, initial concentration of 27.8 ppm, pH 7, and application time of 5.4 min.
  • Pseudo-first-order kinetics best described the Cu (II) removal rate.

Conclusions:

  • Electrocoagulation is an efficient and low-cost method for removing copper from aqueous solutions.
  • Process optimization using RSM significantly reduced energy consumption.
  • The adsorption of Cu (II) onto iron hydroxide/polyhydroxide complexes is a key removal mechanism.