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Ag1.69Sb2.27O6.25 coupled carbon nitride photocatalyst with high redox potential for efficient multifunctional environmental applications
摘要： Most photocatalysts cannot exhibit high efficiency to remove both gaseous and aqueous pollutants due to the limitation of redox potential and chemical property of photocatalyst itself, which will hinder the broad application of the photocatalysts. Herein, silver antimonite (Ag1.69Sb2.27O6.25) is coupled with polymeric carbon nitride (CN) as efficient photocatalyst for various environmental remediation reactions. The UV-visible light adsorption spectra, valence band X-ray photoelectron spectroscopy, and electron spin resonance spectra of different photogenerated radicals have confirmed that the transfer of electrons and holes have high redox potential to produce reactive O2?- and OH?. The Ag1.69Sb2.27O6.25 coupled CN photocatalyst produces much enhanced activity in removing various pollutants in that it exhibits about 15 folds as CN in mineralizing gaseous isopropanol into CO2, 5 folds as Ag1.69Sb2.27O6.25 in destructing aqueous oxytetracycline hydrochloride, and 10 folds as Ag1.69Sb2.27O6.25 in decoloring methylene blue under the irradiation of visible light. Control experiments in presence of scavengers p-benzoquinone and coumarin have revealed that both electrons and holes in heterojunctions participate in degradation reactions, which induce the much enhanced photocatalytic activity in removing pollutants. This study provides a facile strategy to design photocatalysts for efficient multifunctional environmental applications.
关键词： Heterojunction,Photocatalysis,Photodegradation,Silver antimonites,environmental remediation
更新于2025-11-14 17:04:02
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One step fabrication of dual optically/magnetically modulated walnut-like micromotor
摘要： In this paper, we report a novel multi-responsive walnut-like micromotor consisting of polycaprolactone (PCL), iron oxide nanoparticles (Fe3O4NPs) and catalase, which is constructed through a one-step electrospinning method. Based on the catalytic activity and photothermal and magnetic responsiveness originating from catalase and Fe3O4NPs, respectively, the resulting micromotor exhibits autonomous movement in the presence of hydrogen peroxide (H2O2) fuel, controlled motion velocity under light irradiation and guided movement direction upon the application of an external magnetic field. Owing to the hydrophobic nature of the PCL polymer constituent inside the micromotor, the autonomous moving micromotor can collect spilled oil inside a solution once it collides with the oil droplet. Since the micromotor could be separated out using a magnetic field, we believe the current walnut-like micromotor holds great promise in the field of environmental remediation.
关键词： one-step fabrication,micromotor,environmental remediation,motion control,multi-responsive
更新于2025-09-19 17:15:36
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A review on sustainable routes of synthesis and applications of Cuprous Oxide Nanoparticles and their Nanocomposites.
摘要： Nature acts like a “Bio-Laboratory” consisting of plants, algae, fungi, yeast etc. which are composed of bio-molecules. These naturally occurring bio-molecules play a vital role in the synthesis of Cuprous oxide (Cu2O) nanoparticles (NPs) and their nanocomposites (NCs) with distinct shapes and sizes, thereby acting as a driving force for designing safer, greener and sustainable routes using less hazardous chemicals. The present review focuses on the eco-friendly protocols for synthesis of Cu2O NPs and their NCs, characterisation techniques and various applications in organic catalysis, biosensing, environmental remediation and medicinal chemistry. The pivotal role of Cu2O NPs and their NCs in catalysing coupling reactions (C-C and C-N), multicomponent, oxidation-reduction and heterocyclic reactions have been higlighted. It emphasises its role in sustainability of the environment and its range of versatility in heterogenous catalysis. Furthermore, their use in biosensing (electrochemical detection) generates special interest in bioscience and clinical diagnosis. Their significance ensures to build a bridge between academic research and safety of the surroundings.
关键词： green chemistry,medicinal applications,biogenic synthesis,environmental remediation,biosensing,catalysis,Cuprous oxide nanoparticles
更新于2025-09-19 17:15:36
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Cyano-rich mesoporous carbon nitride nanospheres for visible-light-driven photocatalytic degradation of pollutants
摘要： Visible-light-responsive photocatalysis offers exciting opportunities for sustainable environmental pollution control, but the unsatisfactory photoactivity of the existing photocatalysts impedes their practical application. Here, we fabricated a high-activity mesoporous carbon nitride nanosphere (MCNS) photocatalyst by a hard template synthesis method through incomplete polycondensation of the cyanamide precursors during thermal polymerization. The MCNS showed a unique nanosphere structure with a larger specific surface area and possessed more abundant cyano groups than two other graphitic carbon nitride (g-C3N4) materials (i.e., nanosheet and bulk g-C3N4). Experimental results and theoretical calculations indicate important roles of the cyano groups in narrowing the catalyst band gap to favor visible light absorption and accelerating the separation of the electron–hole pairs. With such superior surface properties and improved charge separation efficiency, the MCNS exhibited 14.7 times higher photocatalytic activity for bisphenol A (BPA) degradation than the bulk g-C3N4. The MCNS also showed good stability during repeated use. Therefore, the as-prepared MCNS has great potential for visible-light-responsive photocatalysis in environmental remediation and other photocatalytic applications.
关键词： pollutant degradation,visible-light-driven photocatalysis,bisphenol A,environmental remediation,Cyano-rich mesoporous carbon nitride nanospheres
更新于2025-09-19 17:15:36
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Carbonaceous Biomass-Titania composites with Ti–O–C Bonding Bridge for Efficient Photocatalytic Reduction of Cr(VI) Under Narrow Visible Light
摘要： The aim of this study was to develop carbonaceous materials hybridized with anatase TiO2 composed of Activated Carbon-TiO2 (AC-TiO2), Olive Pits-TiO2 (OP-TiO2) and Wood Shaving-TiO2 (WS-TiO2) by ultrasonic-assisted sol-gel process for the photocatalytic Cr(VI) reduction under UV and narrow visible light. The morphology, crystal structure, surface chemistry and optical properties of the as-prepared and bare-TiO2 were investigated by SEM-EDS, XRD, FTIR, BET, UV-DRS, XPS and photo-current measurements. Unlike bare-TiO2, these composite photocatalysts exhibited an enhanced absorption in visible-light. The band gap energies were found to be 3.20 eV, 2.89 eV, 2.81 eV and 2.95 eV for bare-TiO2, AC-TiO2, OP-TiO2 and WS-TiO2, respectively. On the other hand, as-prepared photocatalysts showed significantly improved photocatalytic Cr(VI) reduction performances under UV and visible light illumination compared to bare-TiO2. A total reduction of 10 ppm of Cr(VI) was obtained after 30 min, 50 min and 130 min under visible light (>420) for AC-TiO2, OP-TiO2 and WS-TiO2, respectively at pH: 3 and in the presence of 10 ppm tartaric acid as hole scavenger, while no reduction was detected for bare-TiO2 under visible light (>420). The efficient photocatalytic reduction of Cr(VI) under visible light by AC-TiO2, OP-TiO2 and WS-TiO2 was mainly due to (i): the narrow band gap of TiO2 nanoparticle deposited in carbonaceous materials, (ii): self-photo-sensitizer role of carbonaceous materials via Ti–O–C bonds and (iii): the electron transfer from TiO2 to carbonaceous materials.
关键词： Cr(VI) Reduction,Environmental remediation.,Visible Light,Photocatalysis,Carbonaceous Biomass-TiO2,Band-gap Narrowing
更新于2025-09-19 17:15:36
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Fabrication of nanoheterostructures of boron doped ZnO-MoS2 with enhanced photostability and photocatalytic activity for environmental remediation applications
摘要： In this work, we have developed two dimensional (2D) nanosheets-nanoparticles (0D) nanoheterostructures of boron-doped ZnO nanoparticles loaded over MoS2 nanosheets with enhanced photocatalytic activity for pollutant removal. A series of nanoheterostructures with varying amount of MoS2 nanosheets were prepared using facile hydrothermal method and characterized by x-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) techniques to confirm there successful synthesis. The optimized nanoheterostructure photocatalyst with 1 wt% of MoS2 nanosheets (BZM1) exhibits superior photocatalytic activity for pollutant removal under visible light illumination. The superior photocatalytic activity of BZM1 nanoheterostructure has been supported by photoluminescence (PL) studies which show the remarkably decreased PL intensity signifying the low recombination rate of photogenerated charge carriers. In addition, the formation of 0D-2D heterojunction plays a significant role in enhancing the photocatalytic activity by accelerated photogenerated charge carriers separation in space and ultimately improved photocatalytic activity. Furthermore, the plausible photocatalytic mechanism has been discussed in detail on the basis of active species trapping experiment which validate the significant role of holes and hydroxyl radicals in degradation process. Overall, this work paves way for the facile fabrication of 0D-2D nanoheterostructures for diverse applications.
关键词： Boron doped ZnO,charge transfer,B-ZnO-MoS2 nanoheterostructures,environmental remediation,photocatalysis
更新于2025-09-19 17:15:36
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Recent advances in carbon quantum dot (CQD)-based two dimensional materials for photocatalytic applications
摘要： CQDs are a new class of carbon material with ultrafine sizes and readily tunable optical properties, which make them extremely intriguing. CQDs have gained widespread attention due to their potential and versatility, and they can be applied in many different fields. One of their many applications is photocatalysis, which has garnered incessant research interest in recent years. State-of-the-art technology utilizes sustainable solar energy, which is both clean and virtually inexhaustible. To date, the photocatalytic performance of CQDs in their raw form is still far from ideal. Nevertheless, they can be substantially enhanced through several modification techniques. In this review, strategies to improve the photocatalytic performance of CQDs, such as size-tuning, surface passivation and functionalization, and elemental doping, are extensively discussed. The review also covers the latest advances in the use of CQDs in photocatalysis to address both environmental and energy-related issues. Particular emphasis is placed on the formation of 0D/2D heterojunction nanocomposites with several 2D materials, such as graphene, graphitic carbon nitride, metal oxides and metallates, metal oxyhalides, transition metal oxides and chalcogenides. The hybridization routes to binary nanocomposites, and their photocatalytic application to carbon dioxide reduction, hydrogen production, and dye and pollutant degradation, are thoroughly reviewed in this paper.
关键词： Two-dimensional materials,Photocatalysis,Energy generation,Carbon quantum dots,Environmental remediation,Heterojunction nanocomposites
更新于2025-09-16 10:30:52
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Visible light-driven water-fueled eco-friendly micromotors based on iron phthalocyanine for highly efficient organic pollutant degradation
摘要： The light-driven micromotor has been demonstrated to have great potential in the environmental remediation field. However, it is still challenging to develop highly efficient, eco-friendly and visible light powered micromotors for organic pollutant degradation. In this paper, we report a eco-friendly micromotor based on iron phthalocyanine (FePc) and gelatin, which exhibits the visible light driven self-propulsion behavior using water fuel based on the photocatalytic reaction and self-diffusiophoresis mechanism. Fast motion behavior is observed which induces the rapid agitation of the solution. This, together with the excellent photocatalytic activity, makes the FePc based micromotor highly efficient when utilized in the degradation of organic pollutants with a normalized reaction rate constant of 2.49×10-2 L m-2 s-1, which is by far the fastest and is far superior than the stationary counterpart. The external fuel-free propulsion and the high efficiency in pollutant degradation make the current micromotor potentially attractive for environmental remediation.
关键词： autonomous movement,micromotor,self-propulsion,environmental remediation
更新于2025-09-16 10:30:52
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Facile Synthesis of Carbon/g-C <sub/>3</sub> N <sub/>4</sub> ?Nanocomposites as Metal-Free Photocatalyst?with Enhanced Visible-Light-Responsive Photocatalytic Properties
摘要： The development of highly effective metal-free photocatalysts in place of traditional photocatalysts is of great significance for environmental remediation by utilization of solar energy. In this work, a new 2D carbon/g-C3N4 metal-free photocatalyst was designed and fabricated via one-step thermal treatment of cyanamide and spent tea leaves (STL). The as-prepared samples were fully characterized and the results revealed that carbon nanosheets are evenly attached on the surface of g-C3N4 by chemical bonds rather than simple physical stacking, which is beneficial to the strong interface interaction. The intimate interfacial bonding of carbon materials with g-C3N4 exhibit enlarged specific surface area, broadened photo-response range, efficient photo-induced electron migration as well as high stability. Thus, the carbon/g-C3N4 photocatalyst showed remarkable enhanced photocatalytic activities in the degradation of antibiotic ciprofloxacin (CIP) in aqueous solution and gaseous benzene than that of pristine g-C3N4 under visible light. Furthermore, a possible photocatalytic mechanism for the improved photocatalytic performance over carbon/g-C3N4 nanocomposites was proposed. This research work can promote the exploration on facile synthesis of total metal-free carbon/g-C3N4 photocatalysts with biomass as the carbon source and its application in environmental pollutants elimination.
关键词： g-C3N4,Environmental remediation,Photocatalysis,Carbon
更新于2025-09-10 09:29:36
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Synthesis of nano-Bi <sub/>2</sub> MoO <sub/>6</sub> /calcined mussel shell composite with enhanced visible light photocatalytic activity
摘要： In this study, a new nano-Bi2MoO6/calcined mussel shell composite photocatalyst was successfully prepared via a facile solvothermal method. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV-vis diffuse reflection spectroscopy (DRS) were employed to investigate the morphology, crystal structure, optical properties. It was shown that the nanometer-scaled Bi2MoO6 crystals was assembled with calcined mussel powder, and forming a similar spheroid structure. The obtained samples were displayed higher photocatalytic activities than pure Bi2MoO6 for the degradation of MB under visible-light irradiation. Among them, the Bi2MoO6/ calcined mussel shell mass ratio of 0.7 exhibited the highest activity, and the MB degradation efficiency reached up to 62.46% within 60 min. As a photocatalytic reactor, its recycling performance showed a good stability and reusability. This new composite photocatalyst material holds great promise in the engineering field for the environmental remediation.
关键词： nano-Bi2MoO6,photocatalytic activity,environmental remediation,calcined mussel shell,visible light
更新于2025-09-10 09:29:36