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Ultraviolet-light-assisted heterogeneous Fenton reaction of Ag-Fe3O4/graphene composites for the degradation of organic dyes
摘要： In this study, Fe3O4/graphene and Ag-Fe3O4/graphene composites with varying content of graphene and Ag were prepared and used as a heterogeneous Fenton catalyst for the degradation of MO and MB under UV-light irradiation. The physicochemical properties of the obtained catalysts were used for the Fenton reaction. In addition, the effects of graphene and Ag content, pH, H2O2 concentration, catalyst loading, and initial MO and MB concentrations on the degradation by the UV-Fenton process were evaluated. Results revealed that the highest removal efficiency of MO and MB is achieved at graphene and Ag concentrations of 10 and 25 wt%, respectively. Furthermore, Ag-Fe3O4/graphene composites were used to assess the degradation of a mixture of MO and MB and other anionic and cationic dyes. Results revealed that Ag-Fe3O4/graphene composites can be used as a broad-spectrum catalyst with good efficiency for the removal of several dye contaminants in water. Moreover, the effect of the addition of ascorbic acid (AA) on dye degradation was investigated. AA accelerated the degradation of organic dyes compared to that without AA. The obtained results revealed that Ag-Fe3O4/graphene composites exhibit stable catalytic activity and reusability after four successive runs.
关键词： Heterogeneous Fenton reaction,Organic dyes,Ag/Fe3O4/graphene
更新于2025-09-23 15:23:52
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Novel up-conversion carbon quantum dots/α-FeOOH nanohybrids eliminate tetracycline and its related drug resistance in visible-light responsive Fenton system
摘要： In this study, novel up-converted carbon quantum dots (CQD) incorporated goethite (α-FeOOH) nanohybrids (CQDs/α-FeOOH) were fabricated via a facile hydrolysis method. CQDs/α-FeOOH exhibited remarkably degradation efficiency towards tetracycline (TC, 0.1503 min-1), approximately 3.7 times than pristine α-FeOOH with much lower amount of H2O2 (0.5 mM) under visible light irradiation (λ＞420 nm). The quenching and electron spin resonance (ESR) tests proved ·OH, O2·- and 1O2 were involved in TC degradation in CQDs/α-FeOOH catalyzed Fenton system. The potential Ultraviolet-Visible-Infrared (UV–vis-IR) broad-spectrum responsive properties of CQDs/α-FeOOH were proved in degradation various surface charged organic contaminants regarding the function of coupling up-conversion CQDs. CQDs/α-FeOOH also exhibited wide application pH, excellent durability, fairly good catalytic performance within different practical water matrices and completely eliminated related drug resistance of TC even under real solar-light conditions. The good biocompatibility makes CQDs/α-FeOOH served as a promising photocatalyst for remediation of water contamination with efficient utilization of solar energy.
关键词： Up-conversion effect,Goethite,Heterogeneous Fenton reaction,Carbon quantum dots,Tetracycline
更新于2025-09-12 10:27:22