Tuning the crystallinity of MnO_(2) oxidant to achieve highly efficient pollutant degradation

摘要

Manganese dioxide(MnO_(2)), a commonly find oxidant in both natural environment and industrial application, plays a crucial role for various organic compound degradation. Tuning the MnO_(2) crystal structure is a cost-effective strategy to boost the oxidation reactions, where the challenge remains due to lacking indepth investigation of the crystal properties. Herein, MnO_(2) with different crystalline structures(x-MnO_(2))including α-, β-and δ-was prepared through the hydrothermal synthesis for a typical organic pollutant removal. The structural and degradation analysis indicated that the oxidation capacity was originated from Mn^(3+) and oxygen vacancies(OVs). The intrinsic relationships between oxidation performance and other physiochemical properties such as morphology and electrochemistry were thoroughly discussed,and positive correlations between oxidation capacity and electrochemical properties were found which eventually led to excellent oxidation performance via modulating the above-mentioned properties. Moreover, the K^(+) content was determined to be the most crucial role in manipulating the structure properties.This work offers a crystal-level insight into the relationship between the crystal structure and oxidative property, promoting rational design of highly efficient oxidant.