Understanding ozone generation in electrochemical cells at mild pHs

In this work, the production of ozone at mild pH conditions using a commercial electrochemical PEM cell CONDIAPURE (R) is evaluated, at once a phenomenological model is proposed to understand the basis of the processes that occur inside the cell. At these pH conditions, the production of ozone can be explained from the oxidation of water, while the decomposition of ozone is found to be extremely important to explain the global experimental behavior observed. Not only is this decomposition a chemical but also an electrochemically assisted process which, in turn, can be related to the production of other oxidants in the cell which interact with ozone behaving as predators. The model formulated explains and satisfactorily reproduces the influence of the operation mode, the current intensity applied and presence and destruction of organics, with regression coefficients (r(2)) ranging from 0.88 to 0.99, helping to understand how the production of ozone should be promoted during electrochemical processes. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

This study evaluates the production of ozone at mild pH conditions using a commercial electrochemical PEM cell CONDIAPURE (R) and proposes a phenomenological model to understand the processes inside the cell. It is found that ozone production can be explained by the oxidation of water, while ozone decomposition plays a crucial role. The model successfully explains the impact of operation mode, current intensity, and presence of organics on ozone production.