摘要
Seeking an effective strategy to develop inexpensive and highly stable photocatalyst materials for dye degradation is of great significance to resolve the global environmental problems caused by dye abuse. Herein, we have reported the environmental-friendly synthesis of exceptionally efficient and highly sustainable hematite nanoparticles (α-Fe 2 O 3 NPs) using Punica granatum seed extract biomolecules. The morphology and phase purity of the synthesized α-Fe 2 O 3 NPs were executed through a series of characterization techniques. FESEM and TEM analysis exhibited that the synthesized α-Fe 2 O 3 NPs were irregular-shaped with an average size of 26.53 nm, while the BET surface area of nanoparticles was estimated to be 31.52 m 2 /g with an average pore diameter of 5.54 nm. α-Fe 2 O 3 NPs exhibited typical ferromagnetic behavior at room temperature. The oxidation states of elements in α-Fe 2 O 3 NPs were confirmed through X-ray photoelectron spectroscopy (XPS) analysis, while the charge on α-Fe 2 O 3 NPs was found to be −10.6 mV. The as-prepared α-Fe 2 O 3 NPs were utilized in solar-light driven photocatalytic degradation of anionic Congo red (CR) and Bromophenol blue (BPB) dye. Experimental results indicated the remarkable photocatalytic activity of α-Fe 2 O 3 NPs, and approximately 89.42% of CR and 87.96% of BPB was degraded in 240 min under sunlight irradiation at ambient conditions. The photocatalytic degradation experiments were also performed under different reaction conditions which followed the pseudo-first-order kinetics. The presence of reactive species generated in the reaction system liable for the CR and BPB degradation were corroborated through radical quenching experiments and further confirmed by EPR analysis. The excellent photocatalytic potential of α-Fe 2 O 3 NPs suggested that the synthesized nanoparticles could effectually be applied to remove organic dyes from the wastewater.
危险品化学品经营许可证（带存储）