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Published on: June 14, 2018
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Analysis of a complex produced in the Fenton oxidation process
Chang Wang1, Siyue Zhang1, Sakai Yuji2
1College of Marine Science and Engineering, Tianjin University of Science & Technology, Tianjin 300457, China
Summary
Researchers identified a novel iron complex in Fenton reactions using UV-visible spectrophotometry. This discovery, linked to hydrogen peroxide concentration, advances understanding of the Fenton reaction mechanism beyond hydroxyl radicals.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
Background:
- The Fenton reaction is crucial for wastewater treatment.
- Its mechanism, particularly the role of iron species and hydroxyl radicals, requires further elucidation.
Purpose of the Study:
- To investigate the formation of iron complexes during the Fenton reaction.
- To characterize the spectral properties of these complexes.
- To explore the relationship between complex formation and hydrogen peroxide concentration.
Main Methods:
- UV-visible spectrophotometry was employed to analyze mixtures of Fe(2+), Fe(3+), and H2O2.
- Spectral changes were monitored without prior separation of the components.
- The influence of the substrate was accounted for to isolate the complex's absorbance.
Main Results:
- An iron-based complex was detected in the Fenton reaction, exhibiting significant absorbance between 190 and 500 nm.
- The presence and concentration of this complex were directly correlated with hydrogen peroxide levels.
- The study confirmed an unknown complex contributing to the Fenton process.
Conclusions:
- The existence of a distinct iron complex in the Fenton reaction is verified.
- This complex's concentration is dependent on hydrogen peroxide.
- The findings offer a new perspective on the Fenton reaction mechanism, potentially complementing the hydroxyl radical theory.
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