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PtO/Pt4+-BiOCl with enhanced photocatalytic activity: Insight into the defect-filled mechanism
摘要： Photocatalyst performance largely depends on the arrangement of surface atoms, especially nanomaterials. Herein, we proposed a novel defect-filled strategy by filling Bi defects on BiOCl surface with Pt4+ to achieve the controlled arrangement of BiOCl-surface atoms. The resulting PtO/Pt4+-BiOCl photocatalyst showed higher sulfamethoxazole (SMZ) degradation and photocatalytic nitrogen-fixation efficiency than PtO/BiOCl. The first-order kinetic constant of SMZ degradation over PtO/Pt4+-BiOCl (0.1312 min?1) was nearly twofold higher than that of PtO/BiOCl (0.0776 min?1). The photocatalytic nitrogen fixation activities of PtO/BiOCl and PtO/Pt4+-BiOCl were 244.2 mol·L?1·h?1 and 375.6 mol·L?1·h?1, respectively. The enhanced photocatalytic activity mainly attributed to the increased light absorption ability and separation efficiency of electron-hole pairs by Pt4+ doping. The defect-filled mechanism was confirmed by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), Electron spin resonance(ESR), and Positron annihilation spectrometry. All these results indicated that the electrostatic interaction between Pt4+ in the precursor and Bi defects on the BiOCl surface was the key step in the defect-filled process. This work provides a new strategy for controlling the surface atom arrangement of nanomaterials.
关键词： sulfamethoxazole,photocatalysis,PtO/Pt4+-BiOCl,defects-filled mechanism
更新于2025-09-12 10:27:22
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Band alignment of BiOCl/ZnO core shell nanosheets by X-ray photoelectron spectroscopy measurements
摘要： To improve optoelectronic properties of bismuth oxyhalides, hybrid BiOX photocatalytic materials have draw a great attention, because of the separation of photogenerated electron-hole pairs. The band offset and band alignments are considered as the key parameters to elaborate carrier transport properties in heterojunction. In this paper, to determine the band alignment of BiOCl and ZnO heterostructure, BiOCl/ZnO core shell nanosheets with different thickness of shell layer were synthesized. The valence band offset (VBO or DEV) of BiOCl/ZnO heterostructure was determined using X-ray Photoelectron Spectroscopy measurements. The DEV value of 0.294 § 0.10 eV was calculated by using the Zn 2p3/2, Bi 4f5/2 binding energies as references. Taking the band gaps of 3.37 eV and 3.4 eV for ZnO and BiOCl samples into consideration, respectively, we obtained the type-II band alignment of BiOCl/ZnO heterostructure with a conduction band offset (CBO or DEc) of 0.324 § 0.10 eV.
关键词： X-ray photoelectron spectroscopy (XPS),band offset,BiOCl,ZnO,atomic layer deposition (ALD)
更新于2025-09-09 09:28:46
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Improved photocatalytic performance of flower-like BiOBr/BiOCl heterojuctions prepared by an ionic liquid assisted one-step hydrothermal method
摘要： Construction of heterojuctions is a promising and solid strategy to tune the photocatalytic performance of BiOCl. In this work, flower-like BiOBr/BiOCl heterojuctions (IL-BiOCl) was in-situ prepared by N-ethylpyridinium bromide ([BPy]Br) assisted one-step hydrothermal method. The samples were studied by a serials method. The results exhibit that [BPy]Br promotes the specific surface area and the separation rate of photoinduced carriers. Energy dispersive spectrometer (EDS) and high resolution transmission electron microscopy (HRTEM) results firmly reveal that BiOBr/BiOCl heterojuctions were successfully constructed. [BPy]Br provides Br source for BiOBr and influences the shape of the IL-BiOCl. Photocatalytic activity of the samples were evaluated, the results reveal that IL-BiOCl possesses higher photocatalytic activity than BiOCl toward decomposition of rhodamine B (RhB) under simulated sunlight irradiation.
关键词： Semiconductors,surfaces,crystal growth,ionic liquid,BiOCl
更新于2025-09-04 15:30:14
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Citric acid-modulated in situ synthesis of 3D hierarchical Bi@BiOCl microsphere photocatalysts with enhanced photocatalytic performance
摘要： 3D hierarchical Bi@BiOCl microspheres were successfully synthesized by a facile solvothermal method using citric acid as a modulating agent and the growth process was revealed. The modulation of citric acid not only reduced the size of BiOCl nanosheets, finally transforming BiOCl microflowers into microspheres, but also induced the in situ reductive deposition of metallic Bi on the surface of the microspheres. Consequently, Bi@BiOCl microspheres showed larger specific surface areas and total pore volumes, higher absorptivity to the visible light and better charge transfer ability than BiOCl microflowers. As a result, Bi@BiOCl microspheres exhibited much better photocatalytic performance than BiOCl microflowers. Bi@BiOCl microspheres modulated by 2.8 g citric acid showed the highest photocatalytic activity, which was 4.4 and 2.5 times higher than BiOCl microflowers in degrading RhB under visible light and salicylic acid under UV light, respectively. This work may provide a new insight into simultaneous size control and in situ metal deposition for Bi-containing photocatalysts and other materials.
关键词： solvothermal method,Bi@BiOCl microspheres,photocatalytic performance,citric acid modulation,in situ reductive deposition
更新于2025-09-04 15:30:14
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Enhanced visible-light-driven photocatalysis of Bi2YO4Cl heterostructures functionallized by bimetallic RhNi nanoparticles
摘要： Bismuth-based Sillen-Aurivillius compounds are being explored as efficient photocatalyst materials for the degradation of organic pollutants due to their unique layered structure that favours effective separation of electron-hole pairs. In this work, we synthesized Sillen-Aurivillius-related Bi2YO4Cl with the bandgap of 2.5 eV by a simple solid-state reaction and sensitized with rhodium nickel (RhNi) nanoparticles (NPs) to form the RhNi/Bi2YO4Cl heterostructure. Photocatalytic activities of BiOCl, Bi2YO4Cl and the RhNi/Bi2YO4Cl heterostructure were examined for the degradation of rhodamine-6G under visible-light illumination. Results demonstrated that the photocatalytic dye degradation efficiency of RhNi/Bi2YO4Cl heterostructures is higher than those of BiOCl and Bi2YO4Cl, attributed to the synergistic molecular-scale alloying effect of bimetallic RhNi NPs. The plausible mechanism for the degradation of rhodamine-6G and the effective electron-hole pair utilization mechanism were discussed.
关键词： Bi2YO4Cl,RhNi catalyst,rhodamine-6G,photocatalysis,BiOCl
更新于2025-09-04 15:30:14