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Liu, Dong; Li, Chunling; Ni, Tianjun; Gao, Ranpeng; Ge, Jiayu; Zhang, Fengquan; Wu, Weidong; Li, Jinliang; Zhao, Qian
Applied surface science, 07/2021, Volume: 555Journal Article
Display omitted •The FCN hybrids exhibited excellent photo-Fenton oxidation performance.•The Fe2O3 QDs loading improved the charge mobility and catalytic sites.•Enhanced activity mechanism and roles of active species were elucidated. Currently, the photo-Fenton oxidation has been increasingly studied in the domain of contaminant elimination. However, the lack of active sites and the slow charge migration in the catalytic process, still limit its practical application. 3D/0D hybrids offer a better opportunity for improving photo-Fenton activity due to their high charge mobility and increased number of catalytic sites, which is highly desirable but remains a large challenge. Herein, 3D interconnected porous g-C3N4 hybridized with Fe2O3 QDs (FCN) was developed and exhibited a porous structure and large specific areas. A large number of active sites and rapid charge separation/migration were achieved by the loading of ultrasmall Fe2O3 QDs on the surface of g-C3N4. Moreover, the high charge mobility of this material promoted the fast conversion of Fe3+ to Fe2+, resulting in the optimum synergistic effect between the photocatalytic and Fenton oxidation processes. Thus, the FCN catalysts exhibited excellent photo-Fenton oxidation activity towards the decomposition of organic contaminants (such as phenol, 2,4-dibromophenol, 2,4,6-trichlorophenol, rhodamine B and methyl orange). In addition, the roles of active species in the photo-Fenton oxidation reaction were also studied, and the results imply that the hydroxyl radicals played the most important role in the degradation of organic contaminants.
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