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Synthesis?of?MgTiO <sub/>3</sub> ?Nanoparticles?for?Photocatalytic?Applications
摘要： Magnesium titanate (MgTiO3) has been successfully synthesized via the sonochemical method by using TiO2 (P25) and Magnesium nitrate (MgNO3)2.6H2O as precursors without any additional phases such as MgTi2O5 and Mg2TiO4. The synthesized nanoparticles were well characterized by optical methods using UV-Vis diffuse reflectance spectroscopy (DRS) and Photoluminescence spectroscopy (PL). The morphology of MgTiO3 nanoparticles is irregular in shape with serious agglomerations were confirmed through SEM analysis. XRD confirms crystal structure and phase purity of MgTiO3 nanoparticles calcined at 700 °C for 2 hours. The calculated band gap energy of MgTiO3 nanoparticles has been found to be 3.05 eV. Using the prepared MgTiO3 nanoparticles, the photocatalytic activities were evaluated by following the degradation of Congo red dye under visible light. Moreover, the influence of various scavengers on the photocatalytic reaction were studied.
关键词： MgTiO3,Scavengers,Congo red,Nanoparticles,Photocatalytic degradation,Sonochemical
更新于2025-09-19 17:15:36
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Photocatalytic Dye and Cr(VI) Degradation Using a Metal-Free Polymeric g-C3N4 Synthesized from Solvent-Treated Urea
摘要： The development of visible-light-driven polymeric g-C3N4 is in response to an emerging demand for the photocatalytic dye degradation and reduction of hexavalent chromium ions. We report the synthesis of g-C3N4 from urea treated with various solvents such as methanol, ethanol, and ethylene glycol. The samples were characterized and the Williamson–Hall method was applied to investigate the lattice strain of the samples. The activity of the samples was evaluated by observing the degradation of methyl orange and K2Cr2O7 solution under light irradiation. Photocatalytic reaction kinetics were determined as pseudo-first-order and zero-order for the degradation of methyl orange and reduction of hexavalent chromium, respectively. Due to the inhibited charge separation resulting from the small lattice strain, reduced crystal imperfection, and sheet-like structure, g-C3N4 obtained from ethanol-treated urea exhibited the highest activity among the evaluated samples.
关键词： solvent-treated urea,Cr(VI) reduction,g-C3N4,photocatalytic degradation
更新于2025-09-19 17:15:36
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Sonochemical synthesis of novel ZnFe2O4/CeO2 heterojunction with highly enhanced visible light photocatalytic activity
摘要： An eco-friendly ZnFe2O4/CeO2 nanocomposites as visible light photocatalysts with different mole ratios were successfully fabricated by sonochemical method. The nanocomposites material was characterized various analytical techniques such as X-ray diffraction (XRD), UV–vis diffuse reflectance spectroscopy (DRS), fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller surface area analysis (BET). The synthesized ZnFe2O4/CeO2 nanocomposites were used to remove malachite green (MG) as a model organic pollution under visible light irradiation. The enhanced photocatalytic activity was described with the term was increased a light absorption intensity enable too appeared a bandgap present in the electron transfer, scavengers of the reactive species and charge prolonged photogenerated carriers. Results showed that the ZnFe2O4/CeO2 nanocomposite in a 0.5:0.5 mol ratio exhibited the superior photocatalytic activity towards wastewater treatment. The synthesized catalyst having capability for enhance photoactive nanocomposites open up a new opportunities in various areas in photocatalysis.
关键词： Photocatalytic degradation,Visible light,ZnFe2O4/CeO2 nanocomposites
更新于2025-09-19 17:15:36
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Ferrocene Linkage Facilitated Charge Separation in Conjugated Microporous Polymers
摘要： Conjugated microporous polymers (CMPs) have full access to the organic synthesis toolbox and feature-rich functionality, structural diversity, and high surface area. We incorporated ferrocene (Fc) into the backbones of CMPs and systematically engineered their optical energy gaps. Compared with the CMPs without Fc units yet adopting similar molecular orbital level, Fc-based CMPs can sufficiently generate reactive oxygen species (ROS) under visible light. The resultant ROS are able to effectively decompose the absorbed pollutants, including organic dyes and chemical warfare agents. Specifically, Fc-based CMPs significantly outperform commercial TiO2 (P25) in the degradation of methylene blue and are capable of converting 2-chloroethyl ethyl sulfide (a mustard gas simulant) into completely nontoxic product.
关键词： conjugated microporous polymer,charge separation,photocatalytic degradation,ferrocene,reactive oxygen species
更新于2025-09-19 17:15:36
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ZIF-8 derived ZnO/Zn6Al2O9/Al2O3 nanocomposite with excellent photocatalytic performance under simulated sunlight irradiation
摘要： In this contribution, ternary ZnO/Zn6Al2O9/Al2O3 nanocomposite was obtained by in situ incorporation of Al3+ during the synthesis of ZIF-8, aiming to improve the adsorption and photocatalytic performance of ZIF-8-derived ZnO under simulated sunlight irradiation. XRD, SEM, TEM, HRTEM, XPS, UV-Vis DRS, BET and PL techniques were employed for the analysis of the crystalline structure, composition, morphology, light absorption and charge separation of the samples. The photocatalytic activity of the samples was evaluated by the degradation of Methyl orange (MO) under simulated sunlight irradiation. Compared to ZIF-8-derived ZnO, the formation of ZnO/Zn6Al2O9/Al2O3 nanocomposite can provide with high BET specific surface area, reduce the band gap, inhibit the recombination of the electron-hole pairs, and hence greatly improve the photocatalytic activity. The maximum photocatalytic degradation rate of 97.5% for a high initial MO concentration of 150 mg/L-1 was obtained over ZnO/Zn6Al2O9/Al2O3 nanocomposite with molar ratio of Al/Zn as 1:1 under simulated sunlight irradiation for 60 min, which is 3.18 times higher than that of ZIF-8-derived ZnO.
关键词： Zn6Al2O9,Simulated sunlight irradiation,Al2O3,ZIF-8,ZnO,Photocatalytic degradation
更新于2025-09-19 17:15:36
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Photocatalytic and adsorption property of ZnS–TiO <sub/>2</sub> /RGO ternary composites for methylene blue degradation
摘要： The visible light–driven ZnS–TiO2/RGO nanocomposites, with good visible light–driven photocatalytic activity, utilizing graphene oxide as precursor, were successfully synthesized via a facile solvothermal thermal method with graphene oxide as precursor. Ti4+ ions were derived from titanium dioxide powder (TiO2, P25) and tetrabutyl titanate. S2- ions were provided by sodium sulfide and zinc acetate, respectively. The photocatalytic and absorbance activity of the nanocomposites was investigated through the photocatalytic degradation of methylene blue in aqueous solution. The results showed that the ZnS–TiO2/RGO nanocomposite prepared by tetrabutyl titanate exhibited better photocatalytic and adsorbance activity for methylene blue under visible light irradiation and its photocatalytic efficiency reached 90% in 60-min light irradiation, almost 1.5 times that of the synthesized ZnS–TiO2/RGO by P25, which was attributed to a cooperative reaction because of an increase of photo-absorption effect of graphene sheets and photocatalytic effect of ZnS nanoparticles. The adsorbance activity for ZnS–TiO2/RGO–tetrabutyl titanate) reached 48%, which was almost 1.7 times higher than that of ZnS–TiO2/RGO-P25 and almost 3.7 times higher than that of ZnS/RGO.
关键词： nanocomposites,graphene,Solvothermal method,adsorptance,TiO2,photocatalytic degradation
更新于2025-09-19 17:15:36
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Dual Functional S-Doped g-C3N4 Pinhole Porous Nanosheets for Selective Fluorescence Sensing of Ag+ and Visible-Light Photocatalysis of Dyes
摘要： This study explores the facile, template-free synthesis of S-doped g-C3N4 pinhole nanosheets (SCNPNS) with porous structure for fluorescence sensing of Ag+ ions and visible-light photocatalysis of dyes. As-synthesized SCNPNS samples were characterized by various analytical tools such as XRD, FT-IR, TEM, BET, XPS, and UV–vis spectroscopy. At optimal conditions, the detection linear range for Ag+ was found to be from 0 to 1000 nM, showing the limit of detection (LOD) of 57 nM. The SCNPNS exhibited highly sensitive and selective detection of Ag+ due to a significant fluorescence quenching via photo-induced electron transfer through Ag+–SCNPNS complex. Moreover, the SCNPNS exhibited 90% degradation for cationic methylene blue (MB) dye within 180 min under visible light. The enhanced photocatalytic activity of the SCNPNS was attributed to its negative zeta potential for electrostatic interaction with cationic dyes, and the pinhole porous structure can provide more active sites which can induce faster transport of the charge carrier over the surface. Our SCNPNS is proposed as an environmental safety tool due to several advantages, such as low cost, facile preparation, selective recognition of Ag+ ions, and efficient photocatalytic degradation of cationic dyes under visible light.
关键词： cationic dyes,pinhole porous nanosheet,photocatalytic degradation,visible light,Ag+ ions,S-doped g-C3N4,fluorescence sensing
更新于2025-09-19 17:15:36
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Sunlight-induced photocatalytic degradation of acetaminophen over efficient carbon doped TiO2 (CTiO2) nanoparticles
摘要： Carbon doped titanium oxide (CTiO2) photocatalyst was successfully synthesized by the sol–gel method. The crystal structure, surface morphology, and optical properties of CTiO2 have been characterized by X-ray diffraction, Brunauer–Emmett–Teller surface area (SBET), scanning electron microscope, UV–Vis, X-ray spectroscopy (EDS), Fourier transform infrared and X-ray photoelectron spectroscopy. The photocatalytic degradation of acetaminophen (AMP) in aqueous solution, seawater, and polluted seawater has been investigated by using the synthesized photocatalyst under irradiation of UV and natural sunlight. The effectiveness of CTiO2 compared to pure TiO2 toward the photocatalytic removal of AMP was significantly observed. The optimized conditions including catalyst dose, initial concentration of AMP and solution pH were also studied for effective photocatalytic removal. The highest degradation rate was obtained when 2.0 g L?1 of the catalyst was used at pH 7. The kinetic results revealed that the photocatalytic degradation of AMP using CTiO2 obeyed a pseudo-first-order reaction kinetics.
关键词： Photocatalytic degradation,Seawater,CTiO2,Nanoparticles,Acetaminophen,Sunlight
更新于2025-09-19 17:15:36
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One-step <i>in situ</i> synthesis of BiOCl/(BiO) <sub/>2</sub> CO <sub/>3</sub> composite photocatalysts with exposed high-energy {001} facets
摘要： Tailoring the chemical composition and morphology of a composite photocatalyst is a key way to achieve superior photocatalytic activity. In this work, a simple method has been developed to controllably prepare BiOCl/(BiO)2CO3 composite photocatalysts with exposed {001} facets. The chemical composition and morphology of the BiOCl/(BiO)2CO3 composites can be easily tuned by simply changing the ethanol/water volume ratio in the initial reaction system. The precursor of guanidine hydrochloride not only acts as the source of chloride and carbonate ions to form the BiOCl/(BiO)2CO3 composites, but also acts as the crystal growth inhibitor to control the growth of BiOCl nanosheets. The composites exhibit superior photocatalytic activity towards the degradation of rhodamine B under visible light irradiation, which can be ascribed to the type-II band alignment and intimate interfacial contacts between BiOCl nanosheets and (BiO)2CO3 nanoparticles, as well as their exposed high-energy facets. Both the formation mechanism of the BiOCl/(BiO)2CO3 composite and the photocatalytic degradation mechanism have been investigated and proposed.
关键词： BiOCl/(BiO)2CO3 composite,solvothermal synthesis,exposed {001} facets,photocatalytic degradation,photocatalyst
更新于2025-09-19 17:15:36
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Enhanced photocatalytic degradation of ciprofloxacin by black Ti3+/N-TiO2 under visible LED light irradiation: Kinetic, energy consumption, degradation pathway, and toxicity assessment
摘要： In this work, the photocatalytic degradation of ciprofloxacin (CIP) by black Ti3+/N-TiO2 under visible LED light irradiation (b-N-TiO2/LED) was studied for the first time. Characterization of the prepared photocatalyst was performed by XRD, UV–Vis DRS, FE-SEM, EDS, HRTEM, and BET techniques. The b-N-TiO2 nanoparticles with high surface area of near 100 m2 g?1 and narrow band gap of 2.0 eV, exhibited a remarkable photocatalytic performance on the degradation (100 %) and mineralization (82 %) of CIP under visible LED light irradiation. The maximum degradation was found at reaction time = 70 min, initial CIP concentration = 0.5 mg L?1, pH = 6.7, and catalyst dosage = 0.43 g L?1. Based on the results, both the hole (h+) and hydroxyl radical (?OH) played a major role than the superoxide radical (?O2?) in CIP degradation. Although common coexisting anions in water had a slight negative effect on CIP degradation; humic acid (HA), especially in higher amounts, showed a considerable inhibitory effect on degradation process. Besides, the intermediates of CIP degradation were ultimately transformed into simple compounds. Accordingly, toxicity assessments revealed that the treatment of CIP solution by b-N-TiO2/LED process remarkably resulted in diminished toxicity compared to the untreated controls. The energy utilized in this study was far less than that used in other studies. Moreover, we found that b-N-TiO2 had desirable stability and can be reused for more than five runs of experiments. Collectively, based on our findings, the b-N-TiO2/LED process is a promising, low cost and feasible candidate can be used for degradation and mineralization of antibiotics like CIP in real water samples.
关键词： Photocatalytic degradation,Mineralization,Visible LED,Black Ti3+/N-TiO2,Reusability,Ciprofloxacin
更新于2025-09-19 17:13:59