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A Novel approach for synthesis of LaFeO3/Bentonite Nanocomposite for degradation of methylene blue with enhanced photocatalytic activity” for publication in your esteemed Journal “Materials research express
摘要： Bentonite supported LaFeO3, an active photo catalyst nanocomposite(NC) was synthesized by citric acid assisted sol-gel method and the photocatalytic activity of synthesized NC is conversed. From the TG-DSC studies, it is prominent that the NC exhibited a little mass gain after600°C from which the calcination temperature for preparing NC was decided. The characterization process of photocatalysts was estimated through Fourier transform infrared (FTIR) spectroscopy, Powder X-ray diffraction (PXRD) studies and Scanning electron Microscopy (SEM). The energy band gap studies were carried out for all the synthesized samples using UV-Vis diffuse reflectance spectroscopy. The photocatalytic activities of all the synthesized samples were evaluated by degrading Methylene Blue (MB) under visible light irradiation. The synthesized LaFeO3/Bentonite (2.5) NC exhibited remarkable and excellent photocatalytic activity with the overall removal rate of MB upto95% for 60 min. The abundant hydroxyl groups of Bentonite and the combination of photocatalytic and photo-Fenton like mechanism of LaFeO3/Bentonite (2.5) could enhance the photocatalytic degradation. Therefore, the LaFeO3/Bentonite is a very promising photocatalyst in future industrial application to treat the dye wastewater.
关键词： Methylene blue,phototocatalytic,Nanocomposite,Photo-Fenton
更新于2025-09-09 09:28:46
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Ag modified ZnS for photocatalytic water pollutants degradation: influence of metal loading and preparation method
摘要： In this paper, the photocatalytic degradation of organic pollutants was investigated using Ag/ZnS nanoparticles at different noble metal loadings. The photocatalysts were prepared at room temperature by two different methods: photodeposition and chemical reduction. The obtained samples were characterized by Specific surface area measurement, X-ray photoelectron spectroscopy, X-ray Powder diffraction, ultraviolet-visible diffuse reflectance and Raman spectroscopy. The X-ray photoelectron spectroscopy spectra showed that Ag is present on ZnS surface as intermediate state between nanostructured Ag0 and Ag2O. Moreover, the addition of silver caused a significant change of the absorption spectrum of bare ZnS, resulting in higher absorbance in the visible region, due to the Ag surface plasmon band. Methylene blue (MB) was used to evaluate the photocatalytic activity of the prepared samples. The best photocatalytic activity was observed using the sample at 0.1 wt% Ag loading prepared by chemical reduction method. In particular, the almost complete MB degradation was achieved using UV-LEDs as light sources and 6 g L-1 of catalyst dosage. Finally, the optimized photocatalyst was also effective in the degradation of phenol in aqueous solution under UV irradiation.
关键词： Ag/ZnS,methylene blue,silver loading,UV irradiation,phenol
更新于2025-09-09 09:28:46
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Adsorption and Photocatalytic Degradation of Methylene Blue Using Potassium Polytitanate and Solar Simulator
摘要： Solar photocatalytic degradation of organic water pollutants can be used to degrade toxic organic pollutants in water. In this study, potassium titanate nanofibres were synthesized by an aqueous peroxide route at high pH and examined as photocatalysts for photodegradation of methylene blue (MB) using a solar simulator. Initially, MB was adsorbed on the surface of potassium polytitanates to achieve adsorption equilibrium before the photocatalysts were illuminated using solar simulator. The results showed that potassium polytitanate nanofibres were effective adsorbents of MB and also facilitated its photocatalytic degradation. Sulphate ion evolution during photocatalysis confirmed that some mineralisation occurred and hence photo-oxidative degradation of MB took place. The optimum operational conditions for the photocatalytic degradation of MB were found at 0.05 g/L of photocatalyst load, 10 mg/L MB and pH 7. The stability and regeneration of the photocatalyst specimen was also studied for 3 degradation cycles using adsorption/photocatalysis model. Morphological structure analysis of potassium titanate showed nanocrystallines structure of longitudinally-oriented isolated fibre with a length up to several micrometres with diameters ranging from 10 to 20 nanometres.
关键词： Methylene Blue,Photocatalysis,Adsorption,Potassium Polytitanate
更新于2025-09-09 09:28:46
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Preparation and Photocatalytic Properties of ZnO Deposited TiO <sub/>2</sub> Nanotube Arrays by Anodization
摘要： ZnO doped TiO2 nanotube arrays (ZnO-TNTs) with an average diameter of 60～80 nm and an average length of 2～4 μm were prepared on the Ti substrate by a one-step anodizing method using NH4F/ethylene glycol as the electrolyte. The phase structure, morphology, chemical composition, photocatalytic property and mechanism of TNTs were studied by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy, UV-vis diffuse reflectance spectra, photoluminescence and photocatalytic degradation of methylene blue under visible light. The results showed that highly ordered ZnO doped TNTs were successfully prepared by anodization. ZnO nanoparticles were dispersively distributed inside the walls of TNTs. ZnO-TNTs having a different amount of ZnO was prepared by adjusting the concentration of Zn(NO3)2·6H2O in the electrolyte. It was found that by changing doping amount of ZnO, the width of the TiO2 band gap and the recombination rate of photo-generated electron–hole pairs also changed. The TNTs which doped with 1 mM ZnO showed the best degradation rate of methylene blue (MB). At the concentration of 1 cm2·mL?1 of ZnO-TNTs, the degradation rate reached at the level of 81.9% with 8 mg·L?1 methylene blue aqueous solution. Compared with undoped TNTs, the band gap of ZnO-TNTs reduced from 3.25 eV to 2.75 eV, and the recombination rate of photo-generated electron–hole pairs decreased significantly. The film of ZnO-TNTs prepared by the one-step anodizing method depicted excellent photocatalytic properties under visible light.
关键词： ZnO-TNTs,Anodization,Methylene Blue,Band Gap,Photocatalytic
更新于2025-09-09 09:28:46
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Green Synthesis of High Temperature Stable Anatase Titanium Dioxide Nanoparticles Using Gum Kondagogu: Characterization and Solar Driven Photocatalytic Degradation of Organic Dye
摘要： The present study reports a green and sustainable method for the synthesis of titanium dioxide (TiO2) nanoparticles (NPs) from titanium oxysulfate solution using Kondagogu gum (Cochlospermum gossypium), a carbohydrate polymer, as the NPs formation agent. The synthesized TiO2 NPs were categorized by techniques such as X-Ray Diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy analysis, Raman spectroscopy, scanning electron microscope- Energy-dispersive X-ray spectroscopy (SEM-EDX), Transmission electron microscopy (TEM), High-resolution transmission electron microscopy (HR-TEM), UV-visible spectroscopy, Brunauer-Emmett-Teller (BET) surface area and particle size analysis. Additionally, the photocatalytic actions of TiO2 NPs were assessed with regard to their ability to degrade an organic dye (methylene blue) from aqueous solution in the presence of solar light. Various parameters affecting the photocatalytic activity of the TiO2 NPs were examined, including catalyst loading, reaction time, pH value and calcination temperature of the aforementioned particles. This green synthesis method involving TiO2 NPs explores the advantages of inexpensive and non-toxic precursors, the TiO2 NPs themselves exhibiting excellent photocatalytic activity against dye molecules.
关键词： methylene blue,titanium dioxide nanoparticles,gum kondagogu,green synthesis,photocatalysis
更新于2025-09-09 09:28:46
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Photocatalytic Degradation of Methylene Blue using Biosynthesized Zinc Oxide Nanoparticles from Bark extract of Kalopanax septemlobus
摘要： In this study, we applied Kalopanax septemlobus-ZnO nanoparticles (Ks-ZnO NPs) with green approach one-pot synthesis. Further, the extracts were used as capping agent and Zn (OAc)2 as the metal precursor to synthesize ZnO nanoparticles. The formation of ZnO NPs, the surface plasmon resonance were observed at 372 nm in UV-Vis spectroscopy. The presence of functional groups which as a capping agent and formation of ZnO nanoparticles were confirmed in Fourier Transform Infrared Spectroscopy (FTIR) result. The crystallization, elemental mapping and morphology showed by X-ray diffraction (XRD), Field-Emission Transmission Electron Microscopy (FE-TEM), and Energy dispersive X-ray spectroscopy (EDX) respectively. The photocatalytic activity of Ks-ZnO nanoparticles, was determined using Methylene blue dye degradation percentage under UV light irradiation (365nm), which resulted rate constant (k) was found 0.1215 with 97.5% of degradation in 30 minutes. In summary, phytochemicals in K. septemlobus extract have a potential as a reducing agent to form Ks-ZnO nanoparticles. The Ks-ZnO NPs are capable to degrade Methylene blue in brief time due to its extract-capped zinc oxide nanoparticles. Accordingly, the use of K. septemlobus for biosynthesis of nanoparticles may have an advance for many applications as a cost-effective and eco-friendly photocatalyst.
关键词： methylene blue,Kalopanax septemlobus,photocatalysis,nanoparticles,zinc oxide
更新于2025-09-04 15:30:14
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Green synthesis, characterization and antifungal and photocatalytic activity of Pithecellobium dulce peel–mediated ZnO nanoparticles
摘要： Zinc oxide (ZnO) nanoparticles (NPs) were synthesized by a conventional method using Pithecellobium dulce peel extract. The phytochemicals present in the peel act as stabilizing agents. The ZnO NPs were characterized by UV-vis spectroscopy, X-ray diffraction (XRD), scanning electron microscopy, and transmission electron microscopy. The XRD pattern confirmed the formation of crystals, which exactly matched with JCPDS card no.36-1451. The nondestructive XRD pattern showed a hexagonal crystalline nature, and scanning electron microscopy revealed a spherical shape. Further, the ZnO NPs exhibited excellent photodegradation efficiency with regard to the dye methyleneblue (MB), a major water pollutant released by the textile industry. A kinetic study of photodegradation of MB showed 63% degradation and a rate constant of 0.00812 min-1. The antifungal activity of the ZnO NPs resulted in 37.81% and 63.57% inhibition of the growth of Aspergillus flavus and 40.21% and 43.04% of growth inhibition of Aspergillus niger at 500 and 1000ppm of ZnO NPs, respectively.
关键词： Photocatalytic activity,Methylene blue,Antifungal,Pithecellobium dulce,ZnO nanoparticles
更新于2025-09-04 15:30:14
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Photocatalytic Performance on Visible Light Induced ZnS QDs-MgAl Layered Double Hydroxides Hybrids for Methylene Blue Dye Degradation
摘要： Semiconductor hybrids based photocatalytic reaction is one of the prominent methods to treat wastewater, containing the organic pollutants. In the present work, we report the development of ZnS QDs-LDH hybrid structure for the photocatalytic treatment of methylene blue (MB) dye. The as-synthesized ZnS QDs-LDH hybrid structure was characterized by XRD, FESEM, HRTEM, EDX, XPS, and FTIR to analyze the formation, morphology and chemical structure. The UV-Vis DRS was used to investigate the optical absorption characteristics of the ZnS QDs-LDH hybrid. The photocatalytic performance of the as-prepared samples was investigated against the methylene blue dye molecule under UV-Vis light irradiation. The scavenging experiments were carried out in order to probe the radical formation by using EDTA, benzoquinone, and 2-proponal. The cycling experiments were performed to check the stability of the ZnS QDs-LDH hybrid photocatalyst after repeated photodegradation experiments.
关键词： ZnS Quantum dots,Layered double hydroxides,Photocatalytic activity,Methylene blue dye degradation,Water treatment
更新于2025-09-04 15:30:14
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Synthesis of Mesoporous Molybdenum Disulfide (MoS <sub/>2</sub> ): A Photocatalyst for Removal of Methylene Blue
摘要： Mesoporous molybdenum disulfide (MoS2) nanostructures were synthesized successfully by hydrothermal method. Their physicochemical properties were studied by X-ray diffraction analysis, scanning electron microscopy and Brunauer–Emmett–Teller surface area analysis. These nanostructures were used as adsorbent and heterogeneous nanocatalyst for removal of methylene blue (MB) as an environmental pollutant organic dye. MoS2 mesoporous nanostructure showed excellent activity for removal of methylene blue under visible light at room temperature. The removal yields of methylene blue by mesoporous nanostructure was 99.6% in 15 minutes which is high enough in comparison with bulk MoS2.
关键词： Methylene Blue,Photocatalyst,Molybdenum Sulfide,Hydrothermal Method,Mesoporous,Heterogeneous Nanocatalyst
更新于2025-09-04 15:30:14
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Kinetic spectrophotometric method for real-time monitoring of ultraviolet photoreactions: A mini-photoreactor
摘要： Photoreactors in research laboratories generally consist of UV-C or UV-A mercury lamps and vessels of volume ranging up to about 1.0 L of solutions (suspensions, solvents, reactants and catalysts). This photoreactor’s design implies in large amounts of chemicals - cost problems, considerable amount of co-generated waste - environmental issues, safety problems and the need of large laboratory space. Currently, there is an effort by the scientific community to apply the principles of “green chemistry”, tending to miniaturize reactors and formats [1-8] and use modern sources of radiation such as light-emitting diodes (UV-LEDs), which are much more environmentally friendly than mercury lamps [9-13]. Another disadvantage of classical photochemical reactors is the withdrawal of aliquots at several times intervals. This procedure modifies the total volume of solutions and, consequently, the total number of absorbed photons per chromophore. Besides that, this methodology is time and labor consuming, and sometimes it is unsafe. In this way, a low amount of experimental points can limit the full kinetic description and lead to misinterpretations in kinetic parameters such as reaction order and rate constants. Accurate determinations are also limited by temperature control, which is not commonly effective in classical photoreactors. Here in it is proposed an interesting mini-photoreactor constituted by one UV-LED and a traditional quartz cuvette of 1.00 cm optical length that allows the reaction execution and, simultaneously, continuous monitoring via UV-Vis spectrophotometry (real-time kinetic analysis). In order to validate the use of this new mini-photoreactor we employed the photodegradation of methylene blue (MB) and salicylic acid (SA) in homogeneous and heterogeneous systems. For the proposition, it is necessary a specific spectrophotometer apparatus with a detection system that is not influenced by external light [14] and a Peltier system for controlling temperature with a mini-bar magnetic agitation. Continuous kinetic monitoring was performed in a spectrophotometer with a xenon flash lamp and silicon diode detectors, which emit flashes only during data collection, which prevents extra photodegradation for very photosensitive samples. Another spectrophotometer’s type that can be employed is that one based on diode-array system, whose external light also does not affect the spectrophotometric measurement.
关键词： methylene blue,mini-photoreactor,UV-LED,real-time monitoring,salicylic acid,ZnO,photodegradation
更新于2025-09-04 15:30:14