Highly Efficient Fe<sup>III</sup>‐initiated Self‐cycled Fenton System in Piezo‐catalytic Process for Organic Pollutants Degradation
Jing Xu, Qiang Zhang, Xin Gao, Peifang Wang, Huinan Che, Chunmei Tang, Yanhui Ao
Abstract
Abstract Piezo‐catalytic self‐Fenton (PSF) system has been emerging as a promising technique for wastewater treatment, while the competing O 2 reductive hydrogen peroxide (H 2 O 2 ) production and Fe III reduction seriously limited the reaction kinetics. Here, we develop a two‐electron water oxidative H 2 O 2 production (WOR−H 2 O 2 ) coupled with Fe III reduction over a Fe III /BiOIO 3 piezo‐catalyst for highly efficient PSF. It is found that the presence of Fe III can simultaneously initiate the WOR−H 2 O 2 and reduction of Fe III to Fe II , thereby enabling a rapid reaction kinetics towards subsequent Fenton reaction of H 2 O 2 /Fe II . The Fe III initiating PSF system offers exceptional self‐recyclable degradation of pollutants with a degradation rate constant for sulfamethoxazole (SMZ) over 3.5 times as that of the classic Fe II ‐PSF system. This study offers a new perspective for constructing efficient PSF systems and shatters the preconceived notion of Fe III in the Fenton reaction.