Abstract
In this paper, a multifield coupled system of synergistic adsorption and photo-Fenton degradation was constructed, and BiFeO3-modified nonmetallic element-doped graphene aerogel composites (BiFeO3/X-rGA) were prepared to realize the advanced treatment of phenol and coking wastewater by utilizing consistent adsorption and catalytic degradation sites. Nonmetallic element-doped graphene formed more defective active sites and changed the planar carbon layer structure, which enhanced the adsorption performance of pollutants on the basis of graphene face adsorption and π-π adsorption. Moreover, element doping also modulated the localized electronic structure of graphene and promoted carrier separation, which in turn enhanced the photo-Fenton degradation activity. The phenol degradation rate constant of BiFeO3/P-rGA was 3.29 times greater than that of BiFeO3/rGA, and the removal efficiency in coking wastewater was also greatly improved. In coupled systems, hydroxyl radicals are the predominant active species, and the mechanism by which nonmetallic modifications promote the synergistic performance of graphene aerogel adsorption and catalytic degradation systems was refined based on experimental and DFT results, providing a new idea for the advanced treatment of wastewater.
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