Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 93, Issue -, Pages 81-85Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2018.06.008
Keywords
Calcium peroxide; Electrochemistry; H2O2 releasing manipulation
Categories
Funding
- US National Institute of Environmental Health Sciences (NIEHS) [P42ES017198, R25 ES025496]
- NATIONAL INSTITUTE OF ENVIRONMENTAL HEALTH SCIENCES [R25ES025496, P42ES017198] Funding Source: NIH RePORTER
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The in situ generation of hydrogen peroxide (H2O2) for water treatment is more practical than the use of liquid H2O2, which is costly to store and transport. Calcium peroxide (CaO2), a solid carrier of H2O2, can release H2O2 on dissolution in water. However, the constant H2O2 release rate of CaO2 has been a bottleneck constraining its wider application. In this study, a practical electrochemical method using a divided cell is developed to control the rate of release of H2O2 from CaO2. The results show that the rate of H2O2 release from CaO2 is enhanced in the anolyte. The increase in H2O2 release is positively correlated with the current. Under a current of 100 mA, the H2O2 concentration was 2.5 times higher after 30 min of electrolysis than in the control experiment in which no current was applied. Water electrolysis in the anodic compartment generates protons that not only: (i) enhance dissolution of CaO2 and release of H2O2, but also (ii) neutralize the alkaline pH resulting from CaO2 dissolution, thus providing new advantages for the use of CaO2. This effective technique may be suitable for the sophisticated control of H2O2 release in environmental applications.
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