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Photocatalytic Degradation of Acidic Blue Black 10B Using SrFe0.5Co0.5O3-d
摘要： The perovskite-type oxides SrFe0.5Co0.5O3-δ is prepared by citrate method using strontium nitrate, iron nitrate, cobalt nitrate as raw materials. The structure of SrFe0.5Co0.5O3-δ is characterized by X-ray diffraction, scanning electron microscopy (SEM), Brunner-Emmet-Teller (BET) measurements. The photocatalytic properties of perovskite oxides SrFe0.5Co0.5O3-δ were evaluated by photocatalytic degradation of acid blue black 10B under the irradiation of UV. Several operational parameters effecting the photocatalytic degradation of acidic blue black 10B (AB) was studied systematically, including irradiation time, photocatalyst dose, acidic blue black 10B initial concentration and amount of H2O2 (1 %). The results showed that perovskite-type oxides SrFe0.5Co0.5O3-δ exhibited excellent photocatalytic properties and the degradation of acidic blue black 10B followed the pseudo-first-order kinetics.
关键词： Acidic blue black 10B,Photocatalytic degradation,SrFe0.5Co0.5O3-δ
更新于2025-09-11 14:15:04
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Preparation of Nb2O5-decorated hierarchical porous ZnO microspheres with enhanced photocatalytic degradation of palm oil mill effluent
摘要： In the present work, Nb2O5-decorated hierarchical porous ZnO microspheres (ZnO/Nb2O5) were successfully prepared through a facile surfactant-free method. The as-prepared samples were characterized by X-ray diffraction, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, UV–Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy and Brunauer–Emmett–Teller surface area analyses. Under UV light irradiation, the ZnO/Nb2O5 composites degraded palm oil mill effluent (POME) efficiently and demonstrated much higher photocatalytic activity compared to those of pure ZnO and Nb2O5. The enhanced photocatalytic degradation performance of ZnO/Nb2O5 composites was attributed to the high charge separation efficiency and hydroxyl radical generation ability as verified by the photoluminescence spectra. Phytotoxicity test upon the POME degradation over ZnO/Nb2O5 photocatalysis considerably decreased through the measurement of radicle lengths of Vigna radiata. Moreover, the ZnO/Nb2O5 composites were reused several times without appreciable loss of activity. This work revealed that the as-prepared ZnO/Nb2O5 composites have great potential for practical applications in the field of wastewater treatment.
关键词： Nb2O5-decorated hierarchical porous ZnO microspheres,Photocatalytic degradation,Charge separation efficiency,Palm oil mill effluent,Hydroxyl radical generation
更新于2025-09-10 09:29:36
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Nigella sativa seed based nanocomposite-MnO2/BC: An antibacterial material for photocatalytic degradation, and adsorptive removal of dye from water
摘要： Antimicrobial Nigella sativa seed-based nanocomposite, MnO2/BC, was synthesized and utilized for water purification through adsorption and photocatalytic degradation. MnO2/BC was prepared by co-precipitation method, and characterized using FT-IR, XRD, SEM, TEM, TGA, and DSC techniques. The composite was investigated for inhibition of bacterial cells growth. FT-IR spectrum indicated the presence of oxygenous groups on the surface; TGA and DSC showed thermal degradation; and XRD, SEM, and TEM investigations indicated amorphous, and porous nature of MnO2/BC having particle size of 190-220 nm. The nanocomposite inhibited the growth of both Gram-positive and Gram-negative bacteria cells in water. The adsorption of Methylene blue (MB) from water was investigated in batch method in terms of amount of MnO2/BC, MB concentration, pH, time, and temperature. 1.0 gL-1 of MnO2/BC removed more than 98% of MB from aqueous solution having concentration of 10 mgL-1 and pH 7.0 at 27°C. The maximum Langmuir adsorption capacity of MnO2/BC was 185.185 mgg-1 at 45°C. The adsorption was an endothermic process which obeyed Freundlich isotherm, and pseudo-second order kinetics. Therefore, the MB binding onto MnO2/BC surface was site-specific partially through weak hydrogen bonding and electrostatic interactions. The photocatalytic activity of MnO2/BC has been investigated by degrading the MB molecules/ions in water under the sunlight and 85% of degradation was achieved during 120 min irradiation. The dye was desorbed at lower pH and regenerated MnO2/BC was used for second cycle of MB adsorption. The results obtained for this study are much better than the previous MB adsorption studies with acid washed Black cumin seeds and MnFe2O4/BC for which the capacities were 73.529 mgg-1 and 10.070 mgg-1 at 27°C, respectively (J. Mol. liq. 2018a, 264, 275-284; J. Clean. Prod. 2018a, 200, 996-1008).
关键词： MnO2/BC,Antibacterial activity,Photocatalytic degradation,Adsorption,Nigella sativa plant seeds,Methylene blue
更新于2025-09-10 09:29:36
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Visible-light-driven CeO2/black phosphorus heterostructure with enhanced photocatalytic performance
摘要： CeO2/black phosphorus (BP) heterostructure nanocomposite was synthesized via a two-step assembly method. The structure and optical property of the prepared composites were characterized by X-ray diffraction, transmission electron microscopy, UV–Vis diffuse reflectance spectroscopy (UV–Vis), Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Photocatalytic degradation of bisphenol A (BPA) in simulated waste water was performed by using CeO2/BP nanocomposite as catalyst. Results indicated that the degradation rate of BPA reached 82.3% within 180 min, which was remarkably improved compared with pure CeO2 and BP due to the formation of indirect Z-scheme heterostructure intermediated by oxygen vacancies originated from CeO2. The unique heterostructure facilitated the charge transfer and preserved the high redox potential leading to improve the photocatalytic degradation performance.
关键词： photocatalytic degradation,heterostructure,bisphenol A,oxygen vacancies,CeO2/black phosphorus
更新于2025-09-10 09:29:36
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Preparation of amine functionalized g-C3N4@H/SMOF NCs with visible light photocatalytic characteristic for 4-nitrophenol degradation from aqueous solution
摘要： At ambience temperature, a facile and large-scale sonochemical synthesis route was used to synthesize graphitic carbon nitride@[Ti4C24H39N3O29] metal-organic framework nanocomposites (g-C3N4-X@YTi-MIL125-NH2 NCs, where X and Y stood for the weight percentages of g?C3N4 and the synthesis method of Ti-MIL125-NH2, respectively) having 2-Amino-1,4-benzenedicarboxylic acid (2-ATA) ligand with amine functional free groups. The obtained NCs were characterized by FT-IR, PXRD, FE-SEM, BET, UV-DRS, PL, EIS, and zeta potential. Moreover, g-C3N4-X@YTi-MIL125-NH2 capability to eliminate 4-nitrophenol (4-NP) contaminant from water via visible light illumination was explored. Our synthesized NCs under a facile, green ultrasonic technique (i.e. g-C3N4-30@STi-MIL125-NH2) had a higher percentage of degradation than those from hydrothermal technique (i.e. g-C3N4-30@HTi-MIL125-NH2) with degradation percentages of 75% and 57%, respectively, which resulted in effective mass transfer and separation of photo?generated charge carriers. Additionally, this higher percentage of degradation could be attributed to the larger surface area and unique morphology of the ultrasonically synthesized particles with higher homogeneity and better and non-agglomerated distribution. Furthermore, excellent reusability and stability were observed for g-C3N4-30@STi-MIL125-NH2. We also explored the role of some scavengers in the degradation procedures to investigate the effect of active species. The experimental results were used to describe the suggested mechanism capability for improved photocatalysis.
关键词： Sonochemistry,Photocatalytic degradation,4-Nitrophenol,Metal-organic Framework,g-C3N4@Ti-MIL125-NH2 NCs
更新于2025-09-10 09:29:36
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Rapid Visible Light Induced Photocatalytic Degradation of Orange-II Using H2O2 Sensitized Cu2O
摘要： Photocatalytic degradation of orange II has been studied using H2O2 sensitized Cu2O and visible light. Complete degradation of orange II is achieved for 90 min of irradiation. Addition of external oxidant H2O2 is found to be enhancing the rate of degradation. Formation of ?OH free radicals during irradiation is ascertained with photoluminescence studies using terephthalic acid as probe molecule.
关键词： Orange II,Photocatalytic degradation,Synergetic effect,Cu2O
更新于2025-09-10 09:29:36
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Preparation and Photocatalytic Performance of Bamboo-Charcoal-Supported Nano-ZnO Composites
摘要： Nano-ZnO/bamboo charcoal composites were prepared by precipitation with bamboo charcoal as support. Nano-ZnO/bamboo charcoal composites were characterized by XRD, SEM and EDS. Photocatalytic degradation processes of methyl orange were studied. The results indicate that the structure of nano-ZnO is of the wurtzite type and the grain size is about 19 – 54 nm. The best preparation temperature for these composites is 500 ℃. The composites have better photocatalytic degradation ability than pure ZnO under UV irradiation. Photocatalytic degradation of methyl orange with the composites obeys first-order kinetics, and the composites can be recycled.
关键词： methyl orange,precipitation,photocatalytic degradation,charcoal,Nano-ZnO
更新于2025-09-10 09:29:36
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The effect of manganese doping on structural, optical, and photocatalytic activity of zinc oxide nanoparticles
摘要： In this work, polyethylene glycol-6000 (PEG-6000) capped ZnO nanoparticles (NPs) were synthesized by doping with varying levels of Mn (0, 1, 2, 3, and 4 wt.%; 0% implies no doping). The crystalline sizes of the hexagonal wurtzite-structured nanoparticles, when measured with (4%) and without Mn doping (0%), were 30 and 28 nm, respectively. The Mn doping led to a shift of the ZnO optical band gap from 3.36 to 3.51 eV. The Mn2+ ions from the doping agent caused tail states in the absorbance spectrum of ZnO NPs, allowing them to be used as effectual UV photocatalysts for the degradation of organic contaminants (e.g., methyl orange (MO), methylene blue (MB), and congo red (CR)). This effect was optimized when doped with 4% Mn. When comparing 0 and 4% Mn doping, the degradation efficiency of the three contaminants was approximately 87/93.5 (MO), 85/88 (MB), and 86/93 (CR)%, respectively. Accordingly, Mn doping on ZnO NPs was found to significantly enhance their photo-degradation efficiency.
关键词： Mn-ZnO,photocatalytic degradation,organic contaminants,UV irradiation,semiconductor nanoparticles
更新于2025-09-10 09:29:36
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Synthesis and characterization of Al-Fe-Cu tri-doped TiO <sub/>2</sub> by in-situ hydrothermal for degradation of methylene blue dyes
摘要： Pure TiO2 and a series of Al-Fe-Cu tri-doped TiO2 were synthesized by using in-situ hydrothermal method. The synthesized materials were characterized using X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) and Scanning Electron Microscope (SEM). The photocatalytic activity of the samples was evaluated for degradation of methylene blue (5mgL-1) in aqueous solution under uv-visible light (λ= <420 nm). The XRD pattern showed that all samples exhibited anatase phase after calcined at temperature 500°C with crystallite size in the range of 10.00-13.23 nm. The FTIR spectra showed three important vibrational modes for vOH, δOH and vTiO that were assigned at range 3411.75-3399.27 cm-1, 1626.91-1630.53 cm-1 and 503.30- 530.93 cm-1, respectively. The degradation rate of Al(1mmol)-Fe-Cu tri-doped TiO2 showed the highest photocatalytic degradation with 93% compared to pure TiO2, Al(2 mmol)-Fe-Cu tri-doped TiO2 and Al(3mmol)-Fe-Cu tri-doped TiO2 were calculated as 76%, 85% and 80%, respectively. Hence, it can be seen that, the amount of Al ion-doping have influence on the photocatalytic degradation.
关键词： Al-Fe-Cu tri-doped TiO2,methylene blue,photocatalytic degradation,in-situ hydrothermal
更新于2025-09-10 09:29:36
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Insight into photocatalytic activity, universality and mechanism of copper/chlorine surface dual-doped graphitic carbon nitride for degrading various organic pollutants in water
摘要： It is still a challenging work to realize the universality of photocatalytic materials for unselective removing various organic pollutants in water. Here a surface dual-doped Cu/Cl-g-C3N4 photocatalyst is firstly prepared, which exhibits much more superior photocatalytic performance for degrading multifarious persistent organic pollutants including tetracycline hydrochloride (TC-HCl), o-chlorophenol, bisphenol A and 2-mercaptobenzothiazole in water than pure g-C3N4. The high-efficiency and unselective photocatalytic degradation performance derives from the surface dual-doped effect of Cu/Cl elements on g-C3N4, which results in the extended visible light harvest range, elevated CB potential and improved the separation efficiency of charge carriers. The intermediate products, degradation pathway, degree of mineralization and reaction mechanism of representative TC-HCl pollutant over the surface dual-doped Cu/Cl-g-C3N4 photocatalyst are revealed in depth. This work makes an important development for treating the persistent organic pollutants in the water environments by exploiting new, low-cost and high-efficiency photocatalytic materials.
关键词： reaction mechanism,photocatalytic degradation,dual-doped Cu/Cl-g-C3N4,various organic pollutants,universality
更新于2025-09-10 09:29:36