Schematic Diagram of the Preparation Process and Structural Characterization Spectra of the Photocatalyst 5%Fe-4PEI-CN (IMAGE)
Caption
First, graphene-like carbon nitride material (CN) was prepared using a two-step calcination method. Next, an electrostatic self-assembly strategy was employed to form covalent bonds between polyethyleneimine (PEI) and the NH2 groups on the surface of CN. Finally, Fe ions coordinated with the NH2 groups linked to PEI through covalent bonds. The XRD spectra showed that the pristine CN had two diffraction peaks at 2θ = 12.8o and 27.3o, corresponding to the (100) and (002) crystal planes of CN, respectively. After PEI modification, the characteristic peaks of 4PEI-CN almost remained unchanged. However, the introduction of Fe ions significantly weakened the two characteristic peaks of 5% Fe-4PEI-CN, indicating that the introduction of Fe ions disrupted the layered stacking structure. Meanwhile, no characteristic peaks related to iron compounds were observed, suggesting that the low-content iron was highly dispersed on CN and 4PEI-CN. In the FT-IR spectra, CN, 5% Fe-CN, 4PEI-CN, and 5% Fe-4PEI-CN all exhibited characteristic peaks of C-N bonds, triazine rings, or heptazine rings. The disappearance of the N-H bending vibration at 1651 cm-1 in both 5% Fe-CN and 5% Fe-PEI-CN confirmed the coordination relationship between Fe ions and NH2 groups.
Credit
Beijing Zhongke Journal Publising Co. Ltd.
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