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Boosting visible light photocatalytic activity via impregnation-induced RhB-sensitized MIL-125(Ti)
摘要： The visible light driven pollutant degradation by photocatalysis is one of the most effective and environmentally friendly strategies, which urgently requires the highly efficient catalysis. In this study, the RhB-sensitized MIL-125(Ti) photocatalyst (RhB/MIL-125) was obtained by post-impregnation strategy in dark, owing to its remarkable adsorption and structure properties of MIL-125(Ti). The nanostructure, morphology and optical properties of as-prepared RhB/MIL-125 catalyst were characterized by various physicochemical methods in detail. It was found that the RhB was successfully incorporated into the MIL-125(Ti) matrix. Excitingly, the obtained RhB-sensitized MIL-125(Ti) showed a boosted photocatalytic performance with the removal rate of MO beyond 90% in 60 minutes under visible light (λ > 420 nm) and exhibited the well stability during recycle tests. The hole (h+) and superoxide free radical (O2??) were the key reactive species during the photodegradation process and the possible photocatalytic mechanism of RhB/MIL-125 for MO degradation was proposed. Our new photocatalyst can inspire the in-depth understanding in the visible light driven process and accelerate the nanoporous materials for real-life energy and environmental applications.
关键词： RhB-sensitized MIL-125,MIL-125(Ti),photocatalytic mechanism,photocatalytic performance
更新于2025-09-19 17:15:36
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Preparation and Photocatalytic Properties of a Bagasse Cellulose-Supported Nano-TiO2 Photocatalytic-Coupled Microbial Carrier
摘要： Intimate coupling of photocatalysis and biodegradation (ICPB) has shown promise in removing unwanted organic compounds from water. In this study, bagasse cellulose titanium dioxide composite carrier (SBC-TiO2) was prepared by low-temperature foaming methods. The optimum preparation conditions, material characterization and photocatalytic performance of the composite carrier were then explored. By conducting a single factor test, we found that bagasse cellulose with a mass fraction of 4%, a polyvinyl alcohol solution (PVA) with a mass fraction of 5% and 20 g of a pore-forming agent were optimum conditions for the composite carrier. Under these conditions, good wet density, porosity, water absorption and retention could be realized. Scanning electron microscopy (SEM) results showed that the composite carrier exhibited good biologic adhesion. X-ray spectroscopy (EDS) results confirmed the successful incorporation of nano-TiO2 dioxide into the composite carrier. When the mass concentration of methylene blue (MB) was 10 mg L?1 at 200 mL, 2 g of the composite carrier was added and the initial pH value of the reaction was maintained at 6, the catalytic effect was best under these conditions and the degradation rate reached 78.91% after 6 h. The method of preparing the composite carrier can aid in the degradation of hard-to-degrade organic compounds via ICPB. These results provide a solid platform for technical research and development in the field of wastewater treatment.
关键词： photocatalytic performance,bagasse cellulose–nano TiO2 composite carrier,characterization,intimate coupling of photocatalysis and biodegradation
更新于2025-09-19 17:13:59
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Unique 1D/3D K <sub/>2</sub> Ti <sub/>6</sub> O <sub/>13</sub> /TiO <sub/>2</sub> micro-nano heteroarchitectures: controlled hydrothermal crystal growth and enhanced photocatalytic performance for water purification
摘要： Semiconductor photocatalysis towards pollutant degradation driven by solar energy is regarded as a promising technology to solve global energy and environmental problems. In this work, three-dimensional (3D) TiO2 microflowers (MFs) were hybridized with one-dimensional (1D) K2Ti6O13 nanobelts (NBs) to construct novel hierarchical Ti–O-based micro-nano heteroarchitectures (HAs) using a controlled hydrothermal route. The well-developed TiO2 MFs were featured with their petals consisting of several 1D nanostructures with the width of around 100–200 nm. Particularly, the crystal growth mechanism of the unique 1D/3D K2Ti6O13/TiO2 HAs was proposed based on the time-dependent experiments combined with structural and morphological characterizations. Unexpectedly, the optimized K2Ti6O13/TiO2 composites exhibited much higher photocatalytic performance for the degradation of organic dyes and antibiotics under simulated sunlight irradiation, which was more than 2-folds higher than that of single K2Ti6O13 and TiO2 catalysts. Moreover, the photocatalytic activity of K2Ti6O13/TiO2 composites for dye degradation was higher than that of commercial P25 under visible light irradiation (λ > 400 nm). Apart from the advantages of hierarchical micro-nano HAs in improving light adsorption and surface area, the enhanced photocatalytic properties could be particularly attributed to the formation of K2Ti6O13/TiO2 heterojunctions that offered available interfacial channels for charge transfer and separation, as proved by the photoluminescence and photoelectrochemical measurements. Furthermore, good stability and long-term durability of the composite photocatalysts were also determined by cycling tests, mainly resulting from the tightly combined K2Ti6O13/TiO2 heterostructures. This work can be extended to design other hierarchical TiO2-based micro-nano hybrids with superior photocatalytic properties for environmental purification and solar energy conversion.
关键词： photocatalytic performance,K2Ti6O13 nanobelts,water purification,Semiconductor photocatalysis,TiO2 microflowers,micro-nano heteroarchitectures,hydrothermal route
更新于2025-09-16 10:30:52
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Plasmon Ag and CdS quantum dot co-decorated 3D hierarchical ball-flower-like Bi <sub/>5</sub> O <sub/>7</sub> I nanosheets as tandem heterojunctions for enhanced photothermal–photocatalytic performance
摘要： Plasmon Ag and CdS quantum dot co-decorated three-dimensional (3D) hierarchical ball-flower-like Bi5O7I nanosheets as tandem heterojunction photocatalysts are synthesized by oil bath, photoreduction and hydrothermal processes. The formation of a tandem heterojunction structure facilitates the migration and spatial separation of photogenerated electron–hole pairs. Plasmon Ag nanoparticles can generate hot electrons to enhance the photothermal performance due to the surface plasmon resonance (SPR) effect. The unique 3D hierarchical ball-flower-like Bi5O7I nanosheets can provide a number of surface active sites and allow incident light to be reflected multiple times within the Bi5O7I nanosheets, thus improving the light utilization. Under the protection of Bi5O7I nanosheets, CdS quantum dots which are deposited by a hydrothermal strategy can effectively avoid photocorrosion. In addition, the introduction of Ag nanoparticles and CdS quantum dots extends the photoresponse to the near infrared (NIR) region. The photocatalytic degradation rate of Bi5O7I/Ag/CdS composites with a CdS content of 5.76 wt% exhibits the best photocatalytic activity, which is several times higher than that of pristine Bi5O7I. The photocatalytic hydrogen evolution is about 10 times higher than that over Bi5O7I nanosheets. Moreover, the photothermal efficiency of Bi5O7I/Ag/CdS is also improved obviously. The results of cyclic experiments show that the composite photocatalysts have high stability. The outstanding photocatalytic and photothermal performance is attributed to the formation of tandem heterojunctions favoring the separation of charge carriers, the 3D hierarchical structure of Bi5O7I offering adequate surface active sites, and the SPR effect of Ag promoting the photothermal effect. These novel Bi5O7I/Ag/CdS tandem heterojunctions may provide a new insight into the synthesis of other photocatalysts with synergistic photocatalytic–photothermal effects.
关键词： tandem heterojunctions,photothermal–photocatalytic performance,Bi5O7I nanosheets,CdS quantum dot,Plasmon Ag
更新于2025-09-16 10:30:52
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Dynamic growth of rhombic dodecahedral Cu <sub/>2</sub> O crystals controlled by reaction temperature and their size-dependent photocatalytic performance
摘要： Compared with low-index {100} or {111} planes of Cu2O crystals, rhombic dodecahedra (RD) Cu2O crystals exposing 12 {110} facets exhibit the most superior photodegradation of organic pollutants. Herein, a series of RD Cu2O crystals with different sizes were successfully synthesized by precisely adjusting the reaction temperature ranging from 40 °C to 100 °C. The results revealed that truncated rhombic dodecahedra (TRD) Cu2O crystals were fabricated when the temperatures was 40 °C. More importantly, on raising the temperature to above 40 °C, Cu2O architectures dynamically evolved from TRD to RD. Meanwhile, the sizes gradually decreased with elevation of the temperature, while the RD morphology of Cu2O crystals remained, demonstrating the importance of temperature for determining the morphology and size of Cu2O crystals. In addition, we also carefully investigated the visible-light photodegradation performance of Cu2O crystals for methyl orange (MO). RD Cu2O crystals exhibited superior photocatalytic activity compared with TRD, and showed size-dependent photocatalytic activity for MO. The photocatalytic activity of RD Cu2O crystals can be greatly improved by decreasing the size. In particular, RD-60 with the minimum size achieved the best photocatalytic properties compared to the other RD and TRD Cu2O crystals, and still displayed high photocatalytic efficiency even after three cycles. Such results advance the understanding that temperature modulation serves as an effective means to fabricate RD Cu2O crystals.
关键词： size-dependent photocatalytic performance,photodegradation,reaction temperature,Cu2O crystals,rhombic dodecahedra
更新于2025-09-16 10:30:52
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Surface Modification for Improving the Photocatalytic Polymerization of 3,4-Ethylenedioxythiophene over Inorganic Lead Halide Perovskite Quantum Dots
摘要： Inorganic lead halide perovskite quantum dots (iLHP-QDs) have recently been used in the photocatalytic reaction. However, the factors that influence the photocatalytic performance of the iLHP-QDs has not been fully investigated. Herein, we synthesised a series of iLHP-QDs with varied halide ratio (CsPbX3, X=I, I0.67Br0.33, I0.5Br0.5, I0.33Br0.67, Br) and studied its influence on the photocatalytic performance by monitoring the polymerization of TerEDOT. The CsPbI3 QDs showed the best performance owing to its narrow bandgap and low exciton binding energy. Moreover, the photocatalytic performance of the iLHP-QDs could be simply improved by being treated with methyl acetate, which can be attributed to the replacement of the oleic acid by the short acetate acid, and the introduction of the traps on the surface of QDs in the post-treatment. These results could help design more efficient photocatalytic system and further promote the application of iLHP-QDs.
关键词： photocatalytic performance,quantum dots,exciton binding energy,charge transport efficiency,halide perovskite
更新于2025-09-11 14:15:04
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Preparation and Photocatalytic Properties of Sr2-xAxFeMoO6 (X = 0, 0.1; A = Li, Na, K)
摘要： In this paper, the sol-gel method is used to synthesize a series of double perovskite oxides Sr2FeMoO6 and Sr1.9A0.1FeMoO6 (A = Li, Na, K). The crystal structure was investigated by X-ray powder diffraction. The results show that all the as-synthesized samples have tetragonal crystal structure, small amount of substitution has little effect to the structure of Sr2FeMoO6 and they can keep double perovskite structure. Their photocatalytic activities were evaluated by degradation of dye acid black 10 B. The effects of the dosage of photocatalyst, irradiation time, irradiation source, initial concentration of dye solutions and alkali metal ions doping on the photocatalytic activity of samples were investigated. The results show that all the samples present high photocatalytic activities. In the dye concentration range of 20-150 mg/L, the decolorizing rate of acid black 10 B can reach above 95 % when the dosage of photocatalyst Sr2FeMoO6 is 100 mg under UV irradiation for 40 min. Moreover, the photocatalytic activity of Li-doped sample is lower than that of the un-doped sample, but the photocatalytic activity of the Na- or K-doped samples are much better than the un-doped sample and the decolorizing rate is nearly 100 %.
关键词： Photocatalytic performance,Sr2FeMoO6,Alkali metal doping,Sol-gel method,Decolorizing rate
更新于2025-09-11 14:15:04
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One step to prepare CNTs modified porous g-C3N4 with excellent visible-light photocatalytic performance
摘要： A kind of carbon nanotubes (CNTs) modified porous graphitic carbon nitride (CNTs/pg-C3N4) photocatalyst was successfully synthesized via one step thermal polycondensation and completely measured by some instruments, such as XRD, FTIR, TEM, BET, DRS, PL, etc. And the relevant experimental data indicated that loaded CNTs could be beneficial to the photoinduced charges transfer, facilitating photoinduced charge separation rate. Meanwhile, surface area and visible light adsorption of CNTs/pg-C3N4 photocatalyst could be increased and improved. These synergetic effects resulted in the as-synthesized CNTs/pg-C3N4 photocatalyst exhibiting better visible-light-induced photocatalytic performance for organic pollutant degradation and the product of clean energy than bulk g-C3N4, pg-C3N4 and CNTs modified bulk g-C3N4, and excellent stable photocatalytic performance was also observed after several recycling experiments. Finally, a reasonable improved photocatalytic reaction mechanism for CNTs/pg-C3N4 photocatalyst is presented.
关键词： Porous graphitic carbon nitride,Photocatalytic performance,Carbon nanotubes,Photocatalyst,Visible-light
更新于2025-09-10 09:29:36
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Recyclable Visible Light-driven O-g-C3N4/GO/N-CNT Membrane for Efficient Removal of Organic Pollutants
摘要： Organic pollutants are harmful to human health, which creates a global need for the development of novel and effective materials for efficiently removing contaminants. Accordingly, the efficient visible light-driven heterostructured membrane combined with oxygen-modified monolayer g-C3N4, graphene oxide, and nitrogen-doped CNT (O-g-C3N4/GO/N-CNT) was successfully fabricated through electrostatic interactions and subsequent vacuum filtration. The results suggested that the O-g-C3N4/GO/N-CNT membrane exhibited higher degradation rate than that of O-g-C3N4/GO and pure O-g-C3N4 under visible-light exposure. This enhanced photocatalytic performance was attributed to the introduction of GO and N-CNT, which acted as electronic acceptors for monolayer O-g-C3N4 that effectively inhibited recombination of photogenerated electron-hole pairs, thus enhancing visible light photocatalytic activity. Furthermore, the enrichment and degradation rate of O-g-C3N4/GO/N-CNT membranes were demonstrated for tetracycline hydrochloride, which was found up to 96.64% and 94.30%, respectively, and no distinct enrichment or catalytic activity reduction was observed when their reusability was measured. These results suggested that these recyclable O-g-C3N4/GO/N-CNT membranes provide a new strategy for the highly efficient removal of environmental pollutants.
关键词： O-g-C3N4/GO/N-CNT heterostructured membrane,Organic contaminants,Recyclable,Enhanced Photocatalytic performance,Enrichment
更新于2025-09-10 09:29:36
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Effects of Au nanoparticles and ZnO morphology on the photocatalytic performance of Au doped ZnO/TiO<sub>2</sub> films
摘要： Au doped ZnO nanocomposite films on TiO2 seeding layer (AuZ/T) were fabricated by hydrothermal processing and their photocatalytic performance was investigated. It could be found that the AuZ/T with micrometer(μm)-sized, lying ZnO bulks revealed optimal photocatalytic performance toward methyl orange (MO) under simulated sunlight, whose apparent degradation rate constant Kapp of 1.31 was about 20% higher compared to that of ZnO/TiO2 and 3 times higher compared to that of ZnO. The Au nanoparticles, TiO2 seeding layer and hydrothermal processing time imposed vital influence on the morphology of ZnO nanostructures, which played key roles in the formation of ZnO/TiO2 heterojunction and charge transfer(CT) inside it, as demonstrated by kinetics of transient photoluminescence (PL) decaying. The incorporation of Au nanoparticles not only induced the variations of ZnO crystallinity and reduction of ZnO band gap (Eg), but also generated the Schottky heterojunction of metal-semiconductor, which would be beneficial to the CT inside nanocomposite films and separation of photo-generated electron-hole pairs, as verified by the remarkable PL suppression. The mechanism responsible for photocatalysis enhancement, which was resulted from the hybrid effects of Au nanoparticles and the ZnO morphology was discussed in details.
关键词： photocatalytic performance,Au doped ZnO,heterojunction,TiO2
更新于2025-09-09 09:28:46