In situ H₂O₂ Generation and Corresponding Pollutant Removal Applications: A Review

Abstract

Catalytic hydrogen peroxide (H2O2) generation from oxygen and water enables a sustainable environment to operate in an effective and green energy‐to‐chemical conversion way, which has attracted increasing interest in the fields of energy production and environment treatment. In light of this, tremendous progresses and developments have been made during the past decades in catalytic H2O2 production for pollutant removal from three perspectives including photocatalysis, electrocatalysis or chemical activation. Herein, we critically review the state‐of‐the‐art developments over various procedures of H2O2 generation and its further application, with the existence of photocatalysts, electrocatalysts, and catalysts, respectively. Benefiting from extensively experimental and theoretical investigations, the performance and stability of H2O2 generation and its utilization can be maneuvered by devising catalytic platform based on numerous catalysts with predominant electronic, chemical and physical properties, which endow the catalysts with efficient electrons transportation, abundant active sites, and sufficient oxygen adsorption for H2O2 generation. Furthermore, this review also discusses the formation mechanism of H2O2 by 2e‐ORR and 2e‐WOR, as well as its functional process of activating and removing pollutants, and summarizes the design principles of various catalysts by focusing on the formation of H2O2. We finally highlight the specific challenges and prospects related to the utilization of catalysts and envision the possible future development trends in the fields of pollutant removal.

Structural Modulation of Covalent Organic Frameworks for Efficient Hydrogen Peroxide Electrocatalysis

“…[61] The electro-Fenton reaction is integral to advancing water purification techniques, with the in-situ electro-synthesis of H2O2 under acidic conditions being a key component in facilitating this reaction. [62][63] The remarkable efficacy of JUC-660 in the electro-synthesis of H2O2 suggests its potential as a superior electro-Fenton catalyst, particularly for the degradation of organic dye pollutants in acidic media. Subsequently, a high-concentration solution of Coomassie Brilliant Blue (200 ppm) was employed as a representative dye contaminant.…”

Green and alcohol-free H2O2 generation paired with simultaneous contaminant treatment enabled by sulfur/cyano-modified g-C3N4 with efficient oxygen activation and proton adsorption

“…As a high-value and environmentally friendly chemical for social development and industrial application, hydrogen peroxide (H 2 O 2 ) has been widely utilized in medical disinfection, chemical smelting, environmental treatment, materials bleaching, etc . 1–5 However, the current anthraquinone (AQ) method for the industrial production of H 2 O 2 in large scale still faces some disadvantages, like the consumption of energy and unavoidable environmental pollution caused by toxic by-products. 6–9 The photocatalytic reduction of oxygen for H 2 O 2 generation seems to be an energy-saving and sustainable strategy when considering synchronous solar-to-chemical conversion and environmental protection.…”

A wheel-like polyoxometalate for haloperoxidase-inspired antibiofouling with H2O2in situ provided by electrocatalysis

“…22 To reverse this situation, additional H 2 O 2 supply is a requisite. 23 However, the operation cost and danger of secondary pollution increase after massive H 2 O 2 injection. 24,25 So, a cheap and safe H 2 O 2 source is very important for haloperoxidase mimic nanozymes involved in antibiofouling.…”