Photo- and Electrochemical Water Treatment: For the Removal of Contaminants of Emerging Concern
Chapter 12: Photo- and Electrochemical Generation of Hydrogen Peroxide for Advanced Oxidation Processes
Published:21 Dec 2022
Special Collection: 2022 ebook collectionSeries: Chemistry in the Environment
Laxman Govind Raikar, Shraddha Paniya, Halan Prakash, Gokulakrishnan Subramanian, Kiran Vankayala, 2022. "Photo- and Electrochemical Generation of Hydrogen Peroxide for Advanced Oxidation Processes", Photo- and Electrochemical Water Treatment: For the Removal of Contaminants of Emerging Concern, Halan Prakash, Rita S Dhodapkar, Kevin McGuigan
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Hydrogen peroxide (H2O2) is an environmentally benign oxidant because it generates water as the byproduct. It was reported in 2015 that the annual production of H2O2 is around 3–5 million tons, produced mainly by the anthraquinone process. However, the anthraquinone process suffers from the use of harmful organic solvents, limitations in centralized production, safety hazards in transportation, etc. To mitigate these issues and also to reduce the price, there is great scientific and industrial interest in the synthesis of H2O2 through alternate approaches such as photocatalytic and electrochemical routes. These techniques are preferable to the anthraquinone method, especially for water treatment by the advanced oxidation process that only requires about <1% wt/vol of peroxide dosage. This chapter focuses on recent studies that demonstrated photo- and electrochemical routes for H2O2 generation using various catalysts, and performance metrics like yield rates, apparent quantum efficiency, solar-to-chemical conversion efficiency (for phototcatalytic materials) and faradaic efficiency, and kinetic parameters (for electrocatalytic materials). Various reported methods for the quantification of H2O2 generated during photo/electrochemical processes are discussed. Reactor designs and future scope are also presented.