RogueRose
International Hazard
Posts: 1593
Registered: 16-6-2014
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AC filter with H202 solution - always decomp of the H2O2?
I poured some solution that probably had some excess H2O2 in it and I noticed some bubbles being emmited but I can't be sure that it isn't air trapped
in the carbon. It seemed that only the submerged carbon was bubbling but the carbon on top of the carbon wasn't bubbling. What's the deal with AC
and H2O2, some reports show that it is a catalyst and others say it can be filtered.
If it is reacting, is it forming O2 & H2O or could it be forming some CO2 somehow?
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JJay
International Hazard
Posts: 3440
Registered: 15-10-2015
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I'm not sure offhand... you could solve the Gibbs free energy equation of CO2 formation from carbon and hydrogen peroxide and see what temperature is
required.
https://www.khanacademy.org/science/chemistry/thermodynamics...
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happyfooddance
National Hazard
Posts: 530
Registered: 9-11-2017
Location: Los Angeles, Ca.
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It's probably just gas adsorbed on the carbon. Carbon can adsorb a ridiculous amount of gas on its surface. I make carbon boiling chips, and when I
throw them in cold water or alcohol, they release a constant stream of bubbles.
Storing them in the freezer in a not-sealed container greatly increases the amount of air adsorbed, try it.
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AJKOER
Radically Dubious
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At least two perspective on how activated carbon can decompose H2O2.
First, AC can attract dust particles (including metals particles, oxides,..) and organics, where many of the latter impurities could foster a
decomposition of the H2O2 into water and oxygen.
Second, from an electrochemical vantage, the AC can act as an electrode (for example, employable in a metal-air battery) to facilitate the transport
of atmospheric O2 into dissolved oxygen. The latter than can feed electrochemical/standard chemical reactions depending on again metal impurities
present, likely leading to the consumption of H2O2.
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