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HPW/PDMAEMA-b-PMAA/ZIF-8 ternary lamellar composites and its photocatalytic degradation of methylene blue
摘要： PDMAEMA-b-PMAA block copolymers were prepared by sequential RAFT of DMAEMA and tBMA and followed by hydrolyzation. The phosphotungstic acid (HPW) was anchored to the PDMAEMA blocks via the electrostatic interaction. Then the obtained HPW-PDMAEMA-b-PMAA was added to the synthesis system of ZIF-8. During the formation of ZIF-8, the PMAA blocks with carboxyl groups can coordinate with Zn2+. The HPW anchored to the PDMAEMA blocks also interact with Zn2+. So the block copolymer can consolidate the interaction with HPW and ZIF-8 and prevent the leaking of HPW. At last, the HPW/PDMAEMA-b-PMAA/ZIF-8 ternary lamellar composites were obtained. The structure of HPW/PDMAEMA-b-PMAA/ZIF-8 hybrid material was characterized by powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). As a photocatalyst, the HPW/PDMAEMA-b-PMAA/ZIF-8 ternary lamellar composites showed the excellent photoactivity toward the degradation of methylene blue. The rate of degradation of MB is 0.0240 min-1, which is 7.5 times that of the commercially available P25 (0.0032 min-1). In the presence of H2O2, the kinetic degradation parameters of the composites achieved to 0.0634 min?1, which is about 19.8 times of P25.
关键词： ternary composite,photocatalysis,HPW/PDMAEMA-b-PMAA/ZIF-8
更新于2025-09-19 17:15:36
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Multiple charge carrier transfer pathways in BiOBr/Bi2O3/BiO0.67F1.66 ternary composite with high adsorption and photocatalytic performance
摘要： BiOBr/Bi2O3/BiO0.67F1.66 ternary composites were designed and prepared via a facile chemical precipitation method and their photocatalytic performances were assessed by degradation of rhodamine B (RhB) under visible light illumination. The highest activity was achieved over BiOBr/Bi2O3/BiO0.67F1.66 ternary composite with Br/F molar ratio of 1:1, which approximately degraded 98.61% of RhB after just 15min irradiation. Contrast to pure BiOBr, the enhanced photocatalytic performances of the ternary composites could be attributed to their larger specific surface areas and multiple charge carrier transfer pathways, which efficiently promoted separation of charge carriers. Besides, the formation mechanism of the composites was discussed in detail as well.
关键词： Bi2O3,Charge carrier transfer pathway,BiOBr,Ternary composite,BiO0.67F1.66
更新于2025-09-10 09:29:36
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Specific electron-transfer and surface plasmon resonance integrated boosting visible-light photoelectrochemical sensor for 4-chlorophenol
摘要： Emerging analytical technologies are being developed to provide advanced methods for monitoring 4-chlorophenol (4-CP) in the environment. Herein, a label-free, sensitive, and rapid photoelectrochemical (PEC) 4-CP detection system was constructed based on ternary composites of Ag nanoparticles, graphitic carbon nitride (GCN) and carbon spheres (CS) (Ag/GCN/CS). The proposed ternary composites were synthesized by a simple hydrothermal method. In this process, ascorbic acid (AA) played a crucial role in reducing Ag+ to metallic Ag, and provided a carbon source for CS. Due to synergistic promotion by the surface plasmon resonance (SPR) effect of Ag nanoparticles and electron-transfer behavior of CS, the ternary composites exhibited a broad visible light response and fast charge transfer, leading to a tremendously enhanced PEC response. Based on the promotion of the PEC response, a PEC sensor for 4-CP was designed by detecting the photocurrent signals of the PEC electrode after adding 4-CP to solution. Under optimal conditions, the PEC sensor exhibited a wide linear range for 4-CP from 16 to 1104 ng mL–1, with a limit of detection (LOD) of 5.33 ng mL–1. In particular, the present work may provide assist in better understanding the synergistic effect between the SPR effect of Ag nanoparticles and electron-transfer properties of CS. The results can also be applied to other PEC and photocatalytic systems in conjunction with high-performance photoactive materials.
关键词： PEC sensor,Carbon materials,Electron-transfer,SPR,Ternary composite
更新于2025-09-04 15:30:14