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Ternary photocatalyst based on conducting polymer doped functionalized multiwall carbon nanotubes decorated with nanorods of metal oxide
摘要： The ternary photocatalyst PEDOT@ZnO@MWCNTs was fabricated using chemical oxidative method of polymerization. The fabrication of the catalyst was further investigated using spectroscopic techniques namely UV–Visible, FT-IR, XRD and the surface morphology was explored by SEM and TEM. The photodegradation kinetics of the azo dye MO followed pseudo first order kinetics at different pH. The photodegradation of the dye was studied in presence of PEDOT@ZnO@MWCNTs on irradiation with visible source of light. The redox activity of the photocatalyst was investigated by cyclic voltammetric technique and the mechanism of the photocatalysis was established via electronic impedance study. The evaluated value of rate constant, half life time period and the degradation efficiency sustenance the competence of the photocatalyst for the photodegradation of MO at the optimum pH value of 3.5. The chemical oxygen demand (COD) analysis was also favored the mineralization of the dye in presence of photocatalyst.
关键词： Photocatalyst,Methyl orange,Kinetics,Photodegradation,Electronic impedance study
更新于2025-11-21 11:18:25
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Laser-induced synthesis and photocatalytic properties of hybrid organic–inorganic composite layers
摘要： A laser-based method was developed for the synthesis and simultaneous deposition of multicomponent hybrid thin layers consisting of nanoentities, graphene oxide (GO) platelets, transition metal oxide nanoparticles, urea, and graphitic carbon nitride (g-C3N4) for environmental applications. The photocatalytic properties of the layers were tested through the degradation of methyl orange organic dye probing molecule. It was further demonstrated that the synthesized hybrid compounds are suitable for the photodegradation of chloramphenicol, a widely used broad-spectrum antibiotic, active against Gram-positive and Gram-negative bacteria. However, released in aquatic media represents a serious environmental hazard, especially owing to the formation of antibiotic-resistant bacteria. The obtained results revealed that organic, urea molecules can become an alternative to noble metals co-catalysts, promoting the separation and transfer of photoinduced charge carriers in catalytic composite systems. Laser radiation induces the reduction of GO platelets and the formation of graphene-like material. During the same synthesis process, g-C3N4 was produced, by laser pyrolysis of urea molecules, without any additional heat treatment. The layers exhibit high photocatalytic activity, being a promising material for photodegradation of organic pollutants in wastewater.
关键词： transition metal oxide nanoparticles,urea,photocatalytic properties,hybrid organic–inorganic composite layers,graphene oxide,graphitic carbon nitride,methyl orange,laser-based synthesis,chloramphenicol
更新于2025-11-14 17:04:02
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Application of chemometric methods to resolve intermediates formed during photo- catalytic degradation of methyl orange and textile wastewater from Ethiopia
摘要： The efficiency of two catalysts (TiO2 and TiO2 supported on zeolite) for the photocatalytic degradation of methyl orange dye and wastewaters from Ethiopian textile industry was evaluated by chemometric methods from UV/Vis data of the reaction mixtures at different times. Multivariate curve resolution statistical analysis combined with an alternating least squares algorithm (MCR-ALS) proved to be an efficient method to resolve the different intermediates present during the photocatalytic degradation of the pollutants and to provide information about their evolution with time. Methyl orange photodegradation at pH = 3 showed different intermediate and concentration profiles than at pH = 6. The evolution of intermediates from textile wastewater photodegradation could also be resolved by this method. From the concentration profile or the reactants, a kinetic study was done. Results revealed that all the photodegradation reactions followed a first order kinetics. When TiO2 supported in Zeolite is used, reactions are in general slower, probably due to a mechanism of adsorption/desorption.
关键词： Wastewater,Chemometrics,Dye photodegradation,Methyl Orange,MCR-ALS
更新于2025-09-23 15:23:52
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Cu-Zn and Cu-Ni Bimetallic Particles Fabricated Using Ascorbic Acid and Its Role in Photodegradation of Methyl Orange
摘要： Chemical reduction of metal salts using ascorbic acid (vitamin C) is a new and green approach in which ascorbic acid serve dual role of reducing and capping agent. Copper, zinc and nickel salts were reduced by ascorbic acid to give bimetallic nanoparticles. SEM images highlight the aggregation of nanoparticles, which is due to the high surface energy of the particles in nano range. Bimetallic particles fabricated are in the weight ratio of 4:1. Subsequent shift of surface plasma resonance band and XRD peaks indicate that the particles are not just a physical mixture of mono metallic particles. UV-visible spectra and XRD result rule out the alloy nature of the particles. Average size of the particles were calculated using XRD data and are in nano scaled. Size of the Cu, Cu-Zn and Cu-Ni particles as calculated by using Scherrer’s equation are 43.47, 38.4 and 43.5 nm, respectively. In this work photo degradation of methyl orange has been studied to demonstrate the catalytic properties of mono and bimetallic particles. Bimetallic particles have superior catalytic application as compared to monometallic particles. These alloying of metals might have result in change of certain electronic configuration, which significantly increase the catalytic application of bimetallic nanoparticles.
关键词： Methyl orange,Ascorbic acid,Bimetallic,Catalytic properties
更新于2025-09-23 15:23:52
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Synthesis and characterization of Fe-doped CdWO <sub/>4</sub> nanoparticles with enhanced photocatalytic activity
摘要： The Fe-doped CdWO4 nanoparticles were successfully synthesized via a hydrothermal method. The morphology, crystal structure and photocatalytic activity of the products were characterized and investigated. The results show that the Fe-doping can enhance the photocatalytic efficiency of CdWO4 for degradation of methyl orange toxic dye. The optimal Fe/Cd atomic ratio of Fe-doped CdWO4 is identified to be 0.10. The high activity of the Fe-doped CdWO4 catalyst would be attributed to the decrease of grain size and the doped Fe ions can trap and transfer the electron–hole pairs.
关键词： doping,photocatalytic,CdWO4,methyl orange,Fe ion
更新于2025-09-23 15:23:52
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The Comparison of the Photocatalytic Performance Shown by TiO <sub/>2</sub> and TiO <sub/>2</sub> /WO <sub/>3</sub> Composites— A Parametric and Kinetic Study
摘要： Kinetic and mechanistic related approaches for mostly titania were intensively studied in the literature. However, combined modelling and kinetic studies are few. Therefore, the present work focuses on modelling the dependence of the degradation kinetics of two model compounds (salicylic acid—SA and methyl orange—MO) on Evonik Aeroxide P25, hydrothermally prepared hierarchical TiO2 and P25/WO3 nanostars, obtained also by hydrothermal crystallization. The obtained individual semiconductors and the composites were characterized using XRD, DRS, SEM, while the photocatalytic degradation of the model pollutants were carried out varying the catalyst load, the initial pollutant concentration and incident light intensity. It was found that the degradation kinetics were independent from the hierarchical nature of the material, while significant dependencies of the degradation efficiency was found from the previously mentioned investigation parameters. All these parametric interdependences were successfully studied and a kinetic model was proposed for both bare TiO2 and TiO2/WO3 composite systems.
关键词： Degradation,Salicylic Acid,Methyl Orange,Kinetic Modelling,Composite Materials
更新于2025-09-23 15:22:29
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Visible Light Driven Catalytic Properties Over Methyl Orange by Novel PtSe2/Graphene Nanocomposites
摘要： High efficient graphene based platinum selenide composite photocatalyst were synthesized by ultrasonic assisted method. The “as-prepared” nanocomposites are further characterized by X-ray diffraction, scanning electron microscopy with an energy dispersive X-ray analysis, transmission electron microscopy, UV-visible absorbance spectra analysis and diffuse reflectance spectra analysis. The photocatalytic activities of the composites are investigated by the degradation of methyl orange as a standard dye. The results showed that the photocatalytic activity of PtSe2 was significantly enhanced by the loading of graphene in the composites.
关键词： Graphene,Ultrasonics,Nanocomposites,Photocatalysis,Methyl orange
更新于2025-09-23 15:21:01
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Synergy of adsorption and photocatalysis on removal of high-concentration dye by Ag/AgCl/Bi6O4(OH)4(NO3)6·H2O nanocomposite using Bi12O17Cl2 as bismuth source
摘要： Novel basic bismuth nitrite nanocomposite-Ag/AgCl/Bi6O4(OH)4(NO3)6·H2O has been applied to remove high-concentration methyl orange (MO). The nanocomposite was prepared by a two-step method with Bi12O17Cl2 as bismuth source. XRD, TEM, HRTEM and IR analyses were performed to clarify the composition and microstructure. TEM and HRTEM images reveal that the nanocomposite is consisted of plate-stacking Bi6O4(OH)4(NO3)6·H2O ultrathin nanosheets, where monodispersed AgCl (3-7 nm) and Ag (10-120 nm) nanoparticles are uniformly distributed. Influences of contact time, MO concentration and solution pH on adsorption capacity have been studied. Adsorption capacity is 349 mg g-1 at natural state, 740 mg g-1 at pH=3, and 141 mg g-1 at pH=9. Visible-light photocatalytic performance was evaluated by degradating high-concentration MO of 500 mg L-1 at natural state, 1500 mg L-1 at acidic condition, and 300 mg L-1 at the alkaline condition. Combining with distinct composition and structure of the nanocomposite, removal mechanism is proposed based on the synergy of adsorption and photocatalysis.
关键词： Adsorption,Photocatalysis,Synergy,High-concentration methyl orange,Ag/AgCl/Bi6O4(OH)4(NO3)6·H2O
更新于2025-09-23 15:19:57
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Hydrothermal synthesis of manganese oxide and nitrogen doped graphene (NG-MnO <sub/>2</sub> ) nanohybrid for visible light degradation of methyl orange dye
摘要： MnO2 nanoparticles and its nanocomposite with nitrogen-doped graphene (NG) have been fabricated via simple hydrothermal synthesis procedure using water as a solvent. X-ray diffraction (XRD) analysis of the as-prepared samples was used to ascertain the phase purity and crystallite size. Field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) were employed to study the surface features and particle size of the synthesised samples. The photocatalytic ability of the methyl orange (MO) dye with bare MnO2 and its hybrid with nitrogen-doped graphene (NG-MnO2) wer compared with visible light prompted degradation of the dye in absence of these catalysts. The prepared nanohybrid (NG-MnO2) showed improved photocatalytic efficacy as compared to the pure MnO2 nanoparticles. The strong ferromagnetic character of nanohybrid helps in easy separation of catalyst even with a bar magnet.
关键词： photodegradation,MnO2 nanoparticles,nitrogen-doped graphene,Methyl orange,visible light
更新于2025-09-19 17:15:36
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Photocatalytic activity of Cu2O/ZnO nanocomposite for the decomposition of methyl orange under visible light irradiation
摘要： ZnO is modified by Cu2O by the process of precipitation and calcination. X-ray diffraction has shown that Cu2O/ZnO catalysts are made of highly purified cubic Cu2O and hexagonal ZnO. Scanning electron microscopy and transmission electron microscopy have shown that ZnO adhered to the surface of Cu2O. Due to the doping of Cu2O, the absorption range of the Cu2O/ZnO catalyst is shifted from the ultraviolet to the visible region due to diffuse reflection. X-ray photoelectron spectroscopy and photoluminescence spectra have confirmed that there is a substantial interaction between the two phases of the resultant catalyst. The degradation efficiency of Cu2O/ZnO on methyl orange solution is obviously enhanced compared to Cu2O and ZnO. The maximum degradation efficiency is 98%. The degradation efficiency is affected by the pH of the solution and initial concentration. After three rounds of recycling, the degradation rate is almost same. This shows a consistent performance of Cu2O/ZnO. The increase in catalytic ability is related to the lattice interaction caused by the doping of Cu2O.
关键词： lattice interaction,Cu2O/ZnO,methyl orange,visible photocatalysis
更新于2025-09-10 09:29:36