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Application of thermal lens microscopy (TLM) for measurement of Cr(VI) traces in wastewater
摘要： In this work, we demonstrate for the ?rst time that Thermal Lens Microscopy technique (TLM) can be applied to monitor the dynamics of a photocatalytic process in-situ. The photocatalytic reduction of hexavalent chromium -Cr(VI)- in aqueous solution using CdS and irradiated with visible light is monitored by TLM. Since the values of Cr(VI) concentration obtained after the photocatalytic process were close to those imposed by the international regulations for drinking water, the use of TLM allowed its measurement with a better reliability than with UV spectroscopy, usually used in this kind of analysis.
关键词： Cr(VI),Photocatalysis,Photoreduction,Thermal lens microscopy,Photothermal,CdS photocatalyst
更新于2025-09-10 09:29:36
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Highly efficient solar light-assisted TiO2 nanocrystalline for photodegradation of ibuprofen drug
摘要： Pure anatase, pure brookite, and anatase/brookite heterojunction (ABH) TiO2 with tunable anatase/brookite ratios were prepared via a facile hydrothermal process using Titanium (III) sulfate, as precursor and different glycine/NaOH ratios, as pH adjusting reagents. The obtained samples were characterized by XRD, Raman, FT-IR, FE-SEM, TEM, EDX, BET surface area, UV-vis-DRS, XPS, and PL. The photocatalytic performance of as-synthesized catalysts was evaluated by photodegradation of ibuprofen under simulated solar light. The photodegradation rate of A/B heterojunction TiO2 photocatalysts was greater 12.5, 8.5 and 1.6 times than that the pure brookite, pure anatase, and the commercial P-25, respectively. The complete ibuprofen mineralization (100%) was performed under simulated solar light within 5 h using the photocatalyst obtained at pH 10 (i.e. 1:3 glycine/NaOH volume ratio), however, the commercial P-25 is 75%. The optimum sample containing 61.8%A/38.2%B exhibits the best photocatalytic activity due to it has a mesoporous structure, high surface area, and the low PL intensity.
关键词： Ibuprofen,Solar light,Photodegradation,Anatase-brookiteTiO2,Photocatalyst
更新于2025-09-10 09:29:36
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Synthesis Optimization and Characterization of Visible-light Responsive Ce-doped Titanate Nanotubes for Enhanced Degradation of Polluting Dyes in Aqueous Environment
摘要： For the decomposition organic substrates in the reaction container, we developed Ce-doped titanate nanotubes as visible light responsive photo catalyst. Anatase titania and titanate nanotubes were prepared using the sol-gel method and hydrothermal method. The photoactivity of Ce-doped titanate nanotubes under visible light were dramatically improved than anatase titania and titanate nanotubes. All titania and titanate nanotubes were characterized using X-ray diffraction, field emission scanning electron microscopy, inductively coupled plasma-atomic emission spectroscopy and UV-Vis absorption spectroscopy. Their’s photocatalytic activities were investigated by the degradation rate of methylene blue solution under UV and visible light condition. The crystalinity of the titanate nanotubes were increased by Ce-doping compared with that of pure titania nanotube. In addition, the UV-Vis absorption ranges of Ce-doped anatase titania and Ce-doped titania nanotube were red shifted by Ce-doping. These morphology changes to nanotubes with Ce-doping will be very useful for practical application for decomposing color dyes included amino group in the wasted water.
关键词： visible light photoactivity,titanate nanotubes,Ce doping,photocatalyst,TiO2
更新于2025-09-10 09:29:36
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Synthesis and characterization of TiO2/ZnCr2O4 core-shell structure and its photocatalytic and antibacterial activity
摘要： A shell of ZnCr2O4 spinel was facilely covered on the surface of TiO2 nanoparticles to synthesize TiO2/ZnCr2O4 core-shell structure using TiO2 seed particles and heterogeneous precipitation. The as-prepared nanocomposite was characterized in terms of crystal structure, morphology and surface area, light absorption and band gap. After coupling TiO2 with ZnCr2O4, a heterojunction formed between the two semiconductor materials. UV–vis absorption spectra showed a red shift of the absorption edges and lower band gap of 3.0 eV for the composite system compared to the single phase TiO2 (3.4 eV) due to the formation of new energy level at the core-shell interface. Photocatalytic activity of the nanocomposites was evaluated by degradation of methylen blue under UV-light irradiation, revealing that the core-shell nanocomosite exhibits superior photocatalytic activity (99% yield) compared to the single phase TiO2 (40% yield) even after 4 consecutive reaction runs. In fact, this enhancement was attributed to the efficient separation and migration of the photogenerated electron–hole pairs at the core-shell interface due to the formation of energy bands heterojunction at the interface. Also, it was found that the synthesized core-shell structure is a highly effective antibacterial material against E. coli bacteria.
关键词： Heterogeneous precipitation,TiO2,ZnCr2O4,Antibacterial,Photocatalyst
更新于2025-09-10 09:29:36
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Central Composite Design (CCD) Optimized Synthesis of Fe3O4@SiO2@AgCl/Ag/Ag2S as a Novel Magnetic Nano-Photocatalyst for Catalytic Degradation of Organic Pollutants
摘要： In this study, we formulated and synthesized an efficient visible light-active magnetic nano-photocatalyst, Fe3O4@SiO2@AgCl/Ag/Ag2S, to decompose methyl orange (MO) as a model organic pollutant. XRD, SEM, TEM, EDS, DRS, and VSM analyses were used to characterize the developed magnetic nano-photocatalyst. Moreover, central composite design (CCD) modeling, which is based on response surface methodology (RSM) modeling, is utilized to optimize the synthetic and operating conditions to maximize the photocataytic performance. The CCD-optimized values for molar ratio of AgCl to Fe3O4, molar ratio of Ag2S to Fe3O4, and the photocatalyst dosage are found to be 0.8, 0.27, and 1.27 g/L, respectively. The developed Fe3O4@SiO2@AgCl/Ag/Ag2S nano-photocatalyst shows a superior photocatalytic activity in decomposition of MO, degrading around 90% and 99% of MO in 30 min and one hour, respectively, under visible light illumination, at which the predicted values are in a good agreement with the experimental values (R2=0.971 and Adj-R2=0.945). Meanwhile, the morphological, physicochemical, and magnetic properties of the developed nano-photocatalyst are largely retained over ten successive cycles of photocatalytic reactions, and no significant decline in the photocatalytic activity is observed.
关键词： Magnetic Nano-Photocatalyst,Central Composite Design (CCD),Organic Pollutant,AgCl/Ag/Ag2S,Water Treatment
更新于2025-09-10 09:29:36
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Synthesis and characterization of Poly (azomethine)/ ZnO nanocomposite towards photocatalytic degradation of Methylene blue, Malachite green and Bismarck brown
摘要： This research was carried out based on the significance of protecting the environment by preventing the contamination of water caused from effluents discharge from dyeing industries, effective nanocomposite were prepared to solve this problem. The poly(azomethine), ZnO and poly(azomethine)/ZnO nanocomposites were prepared and characterized by Fourier Transform-Infra red spectroscopy, UV-Visible spectroscopy, Powder X-ray diffraction, EDAX, SEM and TEM techniques. Methylene blue, malachite green and Bismarck brown were degraded from water using poly (azomethine) (PAZ), Zinc oxide (ZnO), PAZ/ZnO (PNZ) nano composites as photocatalyst in presence of natural sunlight. The degradation efficiency and reaction kinetics was calculated and the outcome of the photocatalytic experiments proved that the PAZ/ZnO nanocomposites reveals excellent photocatalytic activity and effective for decolorisation of dye containing waste water than PAZ and ZnO in presence of natural sunlight. The maximum degradation efficiency 97%, 96% and 95% was obtained for PNZ nanocomposites at optimum dosage of catalyst as 500 mg and 50 ppm of methylene blue, malachite green and Bismarck brown dye concentration respectively. The maximum degradation time was 5 h. After photocatalytic study the samples were characterized by FT-IR and UV-Visible spectroscopy.
关键词： degradation efficiency,advanced oxidation process,Poly(azomethine),ZnO,Nanocomposites,Photocatalyst
更新于2025-09-10 09:29:36
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Titanate-based perovskites for photochemical and photoelectrochemical water splitting applications: A review
摘要： Recently, perovskites have been intensively studied for effective hydrogen production through photocatalytic water splitting reactions. The unique properties of perovskite materials are their tunable bandgap and high photocorrosion stability. Titanate-based perovskites are the most widely studied perovskites for activation under visible light and improvement in the hydrogen gas production rate by sunlight. Beneficial modifications were achieved through element doping, catalyst loading, heterojunction formation with other materials and surface modification. This review presents the progress over the last ten years in titanate perovskite modification and the increases achieved in the H2 production rate.
关键词： Water splitting,Photocatalyst,Hydrogen production,Titanate,Perovskite
更新于2025-09-10 09:29:36
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MoS2/ZnO nanocomposites for efficient photocatalytic degradation of industrial pollutants
摘要： In the present work, molybdenum disulphide-zinc oxide (MoS2/ZnO) nanocomposites were synthesized via a simple dual step hydrothermal reduction method using hydrazine hydrate as a reducing agent. The as prepared nanocomposites have been characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), Raman and photoluminescence (PL) spectroscopy. The structural and morphological analysis showed that particles are crystalline in nature and cubical in shape with an average size of ~22.5 nm.The nanocomposites were evaluated for photocatalytic property. The degradation analysis of industrial pollutants such as Novacron red Hunts- man (NRH) and methylene blue (MB) dye reveals that MoS2/ZnO nanocomposite is an efficient catalyst.
关键词： XPS,Novacron red Huntsman dye,Photocatalyst,Methylene blue,MoS2/ZnO
更新于2025-09-10 09:29:36
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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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Evaluation of the reaction mechanism for photocatalytic degradation of organic pollutants with MIL-88A/BiOI structure under visible light irradiation
摘要： In this study, we synthesized novel visible light photocatalyst MIL-88A/BiOI using depositing BiOI particles on the surface of a metal–organic framework (MIL-88A). Photocatalytic application of binary composite MIL-88A/BiOI was obtained by discoloration of Methylene Blue (MB) and Acid Blue 92 (AB92) in aqueous solution under visible light source. The photodegradation experiments for treating organic dyes show that the MIL-88A/BiOI heterojunction structure possess a higher rate for decomposition of dyes due to the decreased aggregation of the BiOI nanoparticles, effective charge carrier separation and the synergistic effect between MIL-88A and BiOI samples as a heterojunction. Also, the MIL-88A/BiOI structure shows better photocatalytic degradation performance for anionic dyes (AB92) than for a cationic dye (MB). It was further found that ?OH and ?O2? radicals were the most important species responsible for the photodegradation test.
关键词： Visible light-driven,Photocatalyst,BiOI,MIL-88A metal organic framework
更新于2025-09-10 09:29:36