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Related Concept Videos

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...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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 formed in...
Microbial Leaching01:27

Microbial Leaching

Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
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...
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides and...

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Related Experiment Video

Updated: May 31, 2026

[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
09:12

[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

Self-Driven UV/Periodate Process for Cu-EDTA Decomplexation and In Situ Copper Recovery.

Leliang Wu1, Dunyu Sun2, Chenyu Yan1

  • 1School of Environment, Jiangsu Engineering Lab of Water and Soil Eco-Remediation, Jiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response Technology, Nanjing Normal University, Nanjing 210023, China.

Environmental Science & Technology
|May 29, 2026
PubMed
Summary

A novel ultraviolet/periodate (UV/PI) process efficiently degrades copper-ethylenediaminetetraacetic acid (Cu-EDTA) and recovers copper via precipitation. This self-driven method offers a sustainable solution for treating metal-EDTA wastewater.

Keywords:
Cu-EDTADecomplexationIn situ copper recoverySelf-driven processUV/periodate process

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Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution
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Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution

Published on: March 20, 2019

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Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution
07:00

Accumulation and Analysis of Cuprous Ions in a Copper Sulfate Plating Solution

Published on: March 20, 2019

Area of Science:

  • Environmental Chemistry
  • Advanced Oxidation Processes
  • Wastewater Treatment

Background:

  • Stable metal-ethylenediaminetetraacetic acid (metal-EDTA) complexes present challenges for simultaneous ligand degradation and metal recovery.
  • Conventional methods often require pH adjustment or external reductants, increasing complexity and cost.

Purpose of the Study:

  • To develop a self-driven ultraviolet/periodate (UV/PI) process for efficient copper-EDTA (Cu-EDTA) decomplexation and in situ copper recovery.
  • To elucidate the underlying mechanisms of the UV/PI process for simultaneous ligand removal and metal recovery.

Main Methods:

  • A self-driven UV/PI process was employed to treat Cu-EDTA solutions.
  • Mechanistic investigations involved identifying reactive species (e.g., IO3•, 1O2) and analyzing copper redox cycling (Cu(I)/Cu(II)/Cu(III)).
  • Copper recovery was achieved through pH-driven precipitation.

Main Results:

  • The UV/PI process achieved 94.50% EDTA decomplexation and 68.94% copper recovery within 90 minutes without pH adjustment.
  • The process generates reactive iodine species and singlet oxygen, driving EDTA decarboxylation and Cu2+ release.
  • A gradual pH increase to ~7.5, due to proton consumption and IO3- formation, triggered efficient Cu2+ precipitation.

Conclusions:

  • The UV/PI process provides an intrinsically coupled, self-sustained pathway for simultaneous ligand removal and copper recovery from Cu-EDTA wastewater.
  • This method demonstrates lower energy consumption per mass of copper recovered compared to other UV/oxidant processes and exhibits resistance to water matrix interference.
  • The UV/PI process offers a mechanistically informed, environmentally benign, and broadly applicable strategy for treating various heavy metal complexes in wastewater.