Abstract
The promotion of pollutant oxidation degradation efficiency by adding organic catalysts has obtained widespread attention in recent years. Studies have shown that organic substances promote the process of traditional oxidation reactions by accelerating the redox cycle of transition metals, chelating transition metals, activating oxidants directly to generate reactive oxygen species such as hydroxyl and sulfate radical, or changing the electron distribution of the target pollutant. Based on the promotion of typical organic functional groups on the chemical oxidative process, a metal-organic framework has been developed and applied in the field of chemical catalytic oxidation. This manuscript reviewed the types, relative merits, and action mechanisms of common organics which promoted oxidation reactions so as to deepen the understanding of chemical oxidation mechanisms and enhance the practical application of oxidation technology.
Highlights
The recent research advances on the types of organic substances, their environmental affinity, and action mechanisms that can effectively improve the efficiency of oxidative degradation of pollutants were summarized in this manuscript, which means to provide a reference for the further study on chemical oxidation kinetics, application conditions, and mechanisms
Garcia et al studied the difference in the effect of tartaric acid (TA) and hydroxylamine hydrochloride added into the Fe2+ /PDS system on the degradation process of bisphenol A [18,19]; the results showed that they both accelerated the efficiency of free radical generation and broadened the pH range of the reaction
The oxidative degradation of pollutants in the water can be enhanced by adding organic substances or preparing solid materials with organic substances
Summary
A significant amount of research has begun to focus on exploring the technical means to improve the efficiency of chemical oxidation or broaden the pH scope of application. The Fe3+ , Cu2+ , Co2+ , and Mn2+ were used to replace Fe2+ to active H2 O2 , which were feasible for broadening the oxidative pH but would often decrease the oxidation rate [4,5], and solid Fe0 or ores could activate H2 O2 or PDS in near-neutral condition [6,7]. The recent research advances on the types of organic substances, their environmental affinity, and action mechanisms that can effectively improve the efficiency of oxidative degradation of pollutants were summarized in this manuscript, which means to provide a reference for the further study on chemical oxidation kinetics, application conditions, and mechanisms.
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