Constructing a brand-new advanced oxidation process system composed of MgO2 nanoparticles and MgNCN/MgO nanocomposites for organic pollutant degradation?

Environmental Science: Nano Pub Date: 2021-11-30 DOI: 10.1039/D1EN00751C

Abstract

A brand-new advanced oxidation process (AOP) system consisting of MgO2 nanoparticles and MgNCN/MgO nanocomposites was firstly developed for the degradation of organic pollutants. In the novel AOP system, MgO2 nanoparticles as oxidants and MgNCN/MgO nanocomposites as activators were both obtained through a simple one-step process. Batch experiments indicated that the MgO2–MgNCN/MgO system could efficiently degrade organic pollutants in a wide pH range (4–12), and the degradation efficiency was hardly affected by common matrix species (Cl?, NO3?, HCO3?, SO42? and humic acid) and water sources. The high stability and slow-release characteristic of MgO2 endowed the AOP system with a long-term oxidation ability for continuous degradation of organic pollutants. The dominant reactive oxygen species (ROS) responsible for organic degradation was confirmed to be singlet oxygen (1O2), which was attributed to the activation of MgO2 by the bonding effect between MgNCN and MgO in the nanocomposites. Finally, the generated ions, NH4+, NO2? and NO3?, and residual solid in the degradation solution were determined, and the process of organic degradation in the MgO2–MgNCN/MgO system was proposed. This work not only constructed a brand-new AOP system for environmental remediation, but also offered a promising strategy for continuous treatment of organic-polluted wastewater and even soil.

Graphical abstract: Constructing a brand-new advanced oxidation process system composed of MgO2 nanoparticles and MgNCN/MgO nanocomposites for organic pollutant degradation
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