The addition of bases or acids in wastewater treatment can be a viable strategy to convert chemical energy into useful work. So, this chapter discourses on an acid–base machine that operates in cycles of four stages: two of them are buffered isothermal steps, and the other two stages constitute the passage of matter from acid and basic reservoirs. This machine is an electrochemical system, a Neutralization Battery, which carries out work converted from partial change in entropy associated with change in the activity of proton, hydroxyl and/or alkaline ion from the neutralization reactions. Nanomaterials have been investigated and used as proof of concept in these acid–base machines with electrolytic solutions at several pH values. Thermodynamic approach provides efficiency and maximum work of the batteries performed after the full cycle. Additionally, kinetics studies on the ion insertion/deinsertion in the nanomaterials enable a better understanding on the practical irreversibility, and the choice of nanomaterials with suitable properties to be used in the neutralization batteries, aiming to achieve profitable wastewater treatment and environmental preservation, contributing for the sustainable growth.
KeywordsNeutralization battery Mixing entropy battery Energy harvesting CAPMIX Insertion electrode
We are grateful to FAPESP (Project 2015/ 16867-9) for financial support.
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