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Recently, researchers from the Institute of Chemistry of the Chinese Academy of Sciences discovered that hematite nano-photocatalytic materials can activate water molecules with high efficiency and high selectivity.
Value oxidation conversion provides a new strategy
.
According to industry insiders, this research breaks through the bottleneck of traditional free radical-type photo (electro) catalysis and provides new ideas for highly selective photo (electro) catalysis
.
In previous studies, researchers used kinetic isotope effects, electrochemical impedance spectroscopy, in-situ electrochemical infrared spectroscopy and other methods to prove that the photoelectrocatalytic oxidation of water molecules on the surface of hematite is carried out by the mechanism of water molecules nucleophilic attack on surface species.
, Where the oxygen-hydrogen bond breaking process of water molecules is coupled proton/hole transfer, which belongs to the rate-determining step of the reaction
.
Further studies have shown that the surface of hematite nano-electrocatalytic materials can activate water molecules efficiently and selectively, and transfer oxygen atoms in water to a series of organic and inorganic reactants through non-radical pathways, realizing their highly selective oxidation , For example, the highly toxic nitrite, arsenous acid and other inorganic pollutants in the water are oxidized to nitrate and arsenic acid with relatively low toxicity
.
It comprises the central atom lone pair of electrons organics such as organic sulfur, phosphine and the like, a high selectivity can be achieved oxide
Optical (electric) catalysis has broad application prospects in the degradation of pollutants
.
At present, the widely used optical (electro) catalysts mainly oxidize and degrade pollutants through the interface single charge transfer and the free radical species generated