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pH-Controlled photocatalytic abatement of RhB by an FeWO <sub/>4</sub> /BiPO <sub/>4</sub> p–n heterojunction under visible light irradiation
摘要： A novel p–n heterostructure of an FeWO4/BiPO4 nanocomposite was designed and synthesized through a simple hydrothermal method. Among all the nanocomposites prepared with different weight percentages of FeWO4, 30% FeWO4/BiPO4 (S3) showed the highest photocatalytic performance for the degradation of Rhodamine B and tetracycline under visible light irradiation. The degradation efficiency of RhB for the S3 sample was 87% under neutral conditions within 300 min but interestingly, at pH 3, 99% degradation efficiency was observed within 30 min with good recyclability. The enhanced photocatalytic performance should be due to the maximum electron–hole pair decoupling efficiency of the S3 catalyst. The mineralization of RhB during the catalytic process was detected by GC-MS. Consequently, based on the experimental results, a possible photocatalytic mechanism over the FeWO4/BiPO4 composite was anticipated, which indicated the substantial potential of the composite for the treatment of textile and pharmaceutical wastewater.
关键词： p–n heterojunction,Rhodamine B,tetracycline,visible light irradiation,FeWO4/BiPO4,photocatalytic degradation
更新于2025-09-16 10:30:52
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A facile heterogeneous system for persulfate activation by CuFe <sub/>2</sub> O <sub/>4</sub> under LED light irradiation
摘要： In this study, the removal performance for rhodamine B (RB) by persulfate (PS) activated by the CuFe2O4 catalyst in a heterogeneous catalytic system under LED light irradiation was investigated. The effect of vital experimental factors, including initial solution pH, CuFe2O4 dosage, PS concentration, co-existing anion and initial RB concentration on the removal of RB was systematically studied. The removal of RB was in accordance with the pseudo first-order reaction kinetics. Over 96% of 20 mg L?1 RB was removed in 60 min using 0.5 g L?1 CuFe2O4 catalyst and 0.2 mM PS at neutral pH. In addition, free radical quenching experiments and electron spin resonance (EPR) experiments were performed, which demonstrated the dominant role of sulfate radical, photogenerated holes and superoxide radical in the CuFe2O4/PS/LED system. The morphology and physicochemical properties of the catalyst were characterized by XRD, SEM-EDS, TEM, N2 adsorption–desorption isotherm, UV-vis DRS, and XPS measurements. Moreover, 18.23% and 38.79% total organic carbon (TOC) removal efficiency was reached in 30 min and 60 min, respectively. The catalyst revealed good performance during the reusability experiments with limited iron and copper leaching. Eventually, the major intermediates in the reaction were detected by GC/MS, and the possible photocatalytic pathway for the degradation of RB in the CuFe2O4/PS/LED system was proposed. The results suggest that the CuFe2O4/PS/LED system has good application for further wastewater treatment.
关键词： LED light,persulfate,wastewater treatment,rhodamine B,CuFe2O4
更新于2025-09-16 10:30:52
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[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - Polymer Fiber Lasers
摘要： Polymers doped with laser dyes are promising materials for solid state dye lasers. The development of dye doped polymer optical fibers is presented. Furthermore, experimental results from polymer bulk and fiber lasers based on these optical materials are reported.
关键词： rhodamine B,fiber laser,fiber amplifier,polymer fiber,laser dye
更新于2025-09-16 10:30:52
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The Role Played by Graphene Oxide in the Photodeposition and SERS Activity of Plasmonic Ag Nanoparticles Substrates
摘要： Ag nanoparticles substrates deposited by a photocatalytic method display SERS activity for rhodamine B, which is enhanced further by the fluorescence quenching promoted by graphene oxide.
关键词： SERS effect,rhodamine B,graphene oxide,Ag nanoparticles,photodeposition
更新于2025-09-16 10:30:52
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Hierarchically assembled porous TiO2 nanoparticles with enhanced photocatalytic activity towards Rhodamine-B degradation
摘要： Despite tremendous advances in the development of photocatalysts for waste water treatment, the harmful chemicals used in the synthesis reaching the water bodies add up new environmental issues. In this work, hierarchically assembled porous TiO2 nanoparticles (TiO2 NPs) were prepared by an acid-free eco-friendly hydrothermal approach via condensation of alkoxide precursor (titanium (IV) tert-butoxide). Fine tuning of textural properties was facilitated by change in the hydrothermal treatment time. The structure, morphology and the physicochemical properties of the synthesized samples were characterized by XRD, TGA, N2 adsorption-desorption, FE-SEM, and FE-TEM analysis. N2 adsorption-desorption displays a unique double-slit model isotherms for all the samples. The BJH mesopore distribution curves exhibit intense peak at 6.9 nm and slightly broad peak at 46.1 nm in all the samples with further broad peaks in the range of 80-95 nm. The results showed that the photocatalytic activity is highly depend on the textural properties especially pore diameter. The activity and pore diameter were found to follow the trend: TiO2-12h > TiO2-48h > TiO2-24h > TiO2-6h whereas the surface area and crystallite size follows the trend: TiO2-48h > TiO2-12h > TiO2-24h > TiO2-6h. Overall, a simple strategy is presented and could be extended to produce various metal oxides for photocatalytic degradation of various other pollutants and microorganisms.
关键词： Synergistic effect,Rhodamine B degradation,Hierarchical pore structure,TiO2 nanoparticles
更新于2025-09-12 10:27:22
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Synthesis and characterization of poly(methyl methacrylate) co-doped with Tb(tmhd)3 – Rhodamine B for luminescent optical fiber applications
摘要： Currently, there is a growing interest in the development of multi-colored materials based on the combination of two or more systems (organic or inorganic) as a strategy to take advantage of their combined physical or chemical properties. These multi-colored materials have found potential applications as sensors, amplifiers, and optical fibers. In this work, the physical characteristics of poly(methyl methacrylate) (PMMA) doped with Terbium(III)-tris-(2,2,6,6-tetramethyl-3,5-heptanedionate) (Tb(tmhd)3) at 1.57–1.58 mmol and Rhodamine B (RhB) at different concentrations were analyzed. The emission obtained from these samples (multichromophoric samples) varied as function of RhB concentration due to an efficient energy transfer process (33–65%). The role of PMMA as inert matrix that assists in the recombination process was confirmed by FTIR and Raman spectra analysis. Moreover, an improvement in thermal resistance of the materials was observed due to the presence of the dopants during the polymerization process.
关键词： Poly(methyl methacrylate),Rhodamine B,Tb(tmhd)3,Energy transfer,Luminescent optical fiber
更新于2025-09-12 10:27:22
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Silver Quantum Dot Decorated 2D-SnO2 Nanoflakes for Photocatalytic Degradation of the Water Pollutant Rhodamine B
摘要： Decoration of 2D semiconductor structures with heterogeneous metal quantum dots has attracted considerable attention due to advanced optical, electrical, and catalytic properties that result from the large surface-to-volume ratio associated with these structures. Herein, we report on silver quantum dot decorated 2D SnO2 nano?akes for the photocatalytic abatement of water e?uents, the synthesis of which was achieved through a straightforward and mild hydrothermal procedure. The photocatalysts were systematically investigated using UV–Vis, XRD, electron microscopy (SEM, HR-TEM), EDX, XPS and FTIR. The photocatalytic activity of the nanostructures was evaluated for the abatement of water pollutant rhodamine B (RhB), under light irradiation. The mild hydrothermal synthesis (100°C) proved highly e?cient for the production of large scale Ag quantum dot (QD)/SnO2 nano?akes for a novel photocatalytic application. The decoration of SnO2 with Ag QDs signi?cantly enhances the synergetic charge transfer, which diminishes the photo-induced electron-hole reunion. Moreover, the plasmonic e?ect from Ag QDs and 2D-SnO2 structures acts as an electron tank to collect the photo-induced electrons, generating a Schottky barrier between the SnO2 structures and quantum dots. Overall, this resulted in a facile and e?cient degradation of RhB, with a rate double that of pristine SnO2.
关键词： silver quantum dots,2D-SnO2 nano?akes,rhodamine B,photocatalytic activity
更新于2025-09-12 10:27:22
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Optical linearity and bandgap analysis of RhB-doped PMMA/FTO polymeric composites films: A new designed optical system for laser power attenuation
摘要： Thin films of PMMA doped with Rhodamine B-dye have deposited successfully on a fluorine-doped tin oxide (FTO) glass substrate as a new optical system by using a spin coating method. This new system is promising to be used in various technological applications as solar energy cells, electronic apparatuses, devices of optical filter properties and optoelectronic tools. X-ray diffraction (XRD) illustrates a uniform and semicrystalline structure in nature for the obtained thin films. A spectrophotometric investigation was applied on the prepared thin films at the range of (300–2500 nm) for the wavelength. Both linear refractive index and absorption index values were measured to be reduced as the wavelength was raised. Tauc’s plot indicated that direct and indirect transitions were displayed by the thin film. Both direct and indirect bandgaps were calculated and analyzed. Continuous waves of the green laser beam (operating at 532), and He-Ne laser beam (operating at 632.8 nm) were used to study the optical properties of the prepared thin films with different dye concentrations. The results illustrated that the polymeric composites films are highly attenuated for the laser beam of 532 nm. The designed RhB-doped PMMA/FTO composites can be extensively appropriate to the optoelectronic applications.
关键词： Laser power attenuations,Polymeric composite films,Direct and indirect bandgap,Rhodamine B dye,PMMA/FTO films
更新于2025-09-11 14:15:04
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Role of reactive oxygen species in the visible light photocatalytic mineralization of rhodamine B dye by P25–carbon dot photocatalyst
摘要： An undoped carbon dot (C-dot) with very high photoluminescence quantum yield (PLQY) (25%) and the P25/C-dot composite photocatalyst with improved visible light (VL) photocatalytic activity is reported. The composite exhibits superior VL photodegradation (PD) towards the dyes (RhB) and methyl orange compared to that of control P25. The effect of reactive oxygen species (ROS) is studied in the VL PD of the dye RhB using scavengers. Our study suggests that the ROS responsible for the mineralization of RhB is hydroxyl radical (?OH) and the combination of ?OH and singlet oxygen (1O2) has a synergistic effect on the mineralization of RhB. The ?OH formation is thought to be through the secondary reactions of ROS. Enhancement in the VL PD and the formation of ?OH are attributed to the presence of C-dot. The results suggest that C-dot assists the formation of ?OH through secondary reactions.
关键词： photocatalytic activity,mineralization,reactive oxygen species,visible light,rhodamine B,carbon dot
更新于2025-09-10 09:29:36
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Applications of polystyrene/graphite composites in water purification as a semiconductor visible-light photocatalyst for organic pollutant degradation
摘要： The aim of this study was to prepare a polymer/graphite composite thin film as a cheap, and nontoxic photocatalyst that could be activated by visible light. It was characterized using ultraviolet/visible spectrophotometry and X-ray diffraction. Scanning electron microscopy was used to examine the photocatalyst surface before and after a photodegradation process. The photocatalyst showed activity under visible light and was used for the photodegradation of methylene blue (MB) and rhodamine B (Rh-B) as target pollutants. The process was studied with different pH values, initial dye concentrations, and light intensities from the radiation source to evaluate their effects. The results revealed that the photodegradation was affected by the initial dye concentration, and also showed that the best conditions for the photodegradation reactions of both dyes were an alkaline medium and a light intensity of 80 wt. The films prepared under the conditions reported herein could be promising materials in water purification.
关键词： Rhodamine B,Methylene blue,Photocatalyst,Photodegradation
更新于2025-09-10 09:29:36