In situ synthesis of Tree-branch-like Copper-manganese oxides nanoarrays supported on copper foam as a superior efficiency Fenton-like catalyst for enhanced degradation of 4-chlorophenol

Recently, considerable attention has been paid to develop novel Fenton-like oxidation systems for environmental remediation. The activation of periodate (NaIO4) is a desirable oxidation process that drive redox reactions to produce abundant reactive oxygen species (ROS) by a suitable activator. This study reports a simple hydrothermal-calcination route for forming novel tree-branch-like copper-manganese oxides (CuMnOx@MnOx, CMM) nanoarrays, and the production of radical species from NaIO4 induced by CMM for the removal of rhodamine B and 4-chlorophenol from wastewater. The synergistic effects of Cu oxides and Mn oxides composite significantly elevated the activation of periodate, exhibited excellent degradation performance in the CMM/ NaIO4. Furthermore, reduced copper species and mixed-valence manganese species play a major role in reaction via XPS analysis. Additionally, the underlying degradation mechanism of this work was systematically researched by radical quenching tests and EPR analysis. Superoxide anion radical (center dot & nbsp;O-2-) was the major free radicals in this system, simultaneously the production of non-radical singlet oxygen (O-1(2)) via the electron transfer, which are contributed to remove organic pollutants. This work provides a facile way for fabricating monolithic multi-component metal oxides, and new insights into understand activation mechanism of manganese-based periodate activator.

Automated summary

This study presents a hydrothermal-calcination route to fabricate novel copper-manganese oxide nanoarrays for environmental remediation. The synergistic effects of copper and manganese oxides significantly enhance the activation of periodate and the production of reactive oxygen species (ROS). The produced superoxide anion radicals and singlet oxygen contribute to the degradation of organic pollutants in wastewater.