The
proton-coupled electron transfer (PCET) reaction of a quinone
has been used to create a pH gradient capable of the active pumping
of CO2 through a liquid membrane. The quinone redox couples,
hydroquinone/benzoquinone and 2,6-dimethylbenzoquinone/2,6-dimethylhydroquinone,
have been investigated in the proton transfer mechanisms associated
with electron transfer in sodium bicarbonate solutions. These same
conditions have then been applied to an active liquid membrane for
proton pumping across a membrane electrode assembly under potential
bias, acting as an active membrane for CO2 separation.
Qualitative results are reported toward the development of an active
redox membrane for CO2 separation from flue gas.
The production of excess sludge by biological wastewater treatment processes has been a serious issue for the operation of wastewater treatment plants (WWTP) on both the economic and environmental sides.
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