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CaO

Yue Pan¹, Hanrui Su¹, Yitong Zhu¹

¹School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.

|September 15, 2018

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Calcium peroxide (CaO2) significantly accelerates Fenton-like reactions at neutral pH by enhancing ferric ion (FeIII) reduction. This novel approach rapidly degrades phenol, overcoming limitations of traditional hydrogen peroxide (H2O2) systems.

Area of Science:

Environmental Chemistry
Advanced Oxidation Processes
Catalysis

Background:

Fenton-like reactions are crucial for pollutant degradation but limited by slow ferric ion (FeIII) reduction.
Achieving efficient degradation at neutral pH remains a significant challenge.

Purpose of the Study:

To dramatically accelerate Fenton-like reactions at neutral pH.
To investigate the use of calcium peroxide (CaO2) as an alternative hydrogen peroxide (H2O2) source.
To elucidate the mechanism behind the accelerated reaction.

Main Methods:

Utilized calcium peroxide (CaO2) as the H2O2 source and EDTA as a ferric ion chelator.
Performed phenol degradation experiments comparing CaO2 and H2O2 systems.
Employed Visual MINTEQ for speciation analysis and chloroform as a probe for superoxide radical (O2·-) detection.

Keywords:

Calcium peroxide Fenton-like reaction Hydrogen peroxide Superoxide radicals

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Analyzed reaction kinetics and proposed a mechanistic pathway.

Main Results:

Phenol degradation was immediate and complete in 30 min with CaO2, compared to a 60 min lag phase in H2O2 systems.
Fe-EDTA- was identified as the active species.
Superoxide radical (O2·-) production was four orders of magnitude higher in the CaO2 system.
A mechanism involving two-electron transfer from CaO2 to FeIII-EDTA was proposed.

Conclusions:

Calcium peroxide (CaO2) offers a superior alternative to H2O2 for Fenton-like reactions at neutral pH.
The enhanced reaction rate is attributed to efficient FeIII reduction facilitated by CaO2.
This study presents a promising strategy for organic pollutant removal and a novel source of superoxide radicals (O2·-).