Iron-immobilized graphene oxide (GO-Fe) were synthesized by directly adsorbing iron salts (Fe(II) and Fe(III)) to graphene oxide (GO) at a moderate temperature. The process is environmentally friendly and convenient compared with previously reported methods. Compared with GO and GO-Fe(II), the GO-Fe(III) exhibited the highest phenol degradation efficiency (97.3%, 600 min) by activating persulfate (PS). A comprehensive study was conducted utilizing particle characterization, iron leaching test, radical scavengers and electron paramagnetic resonance (EPR) to reveal a detailed mechanism of PS activation. For the first time, a nonradical pathway (1O2) accompanied by radical generation (●OH, SO4●- and ●O2-) in phenol oxidation with PS was discovered upon iron heteroatom immobilization on the GO. The findings can be used for the cost-efficient and simple synthesis of GO catalysts for various catalytic oxidation processes.

Simple iron immobilization on graphene oxide for persulfate activation: Radicals and singlet oxygen mediated oxidation

2019 Fall National Meeting

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