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Bio-inspired green synthesis of zinc oxide nanoparticles using Abelmoschus esculentus mucilage and selective degradation of cationic dye pollutants
摘要： In this study, biogenic zinc oxide nanoparticles (ZnO NPs) were fabricated via a green synthetic strategy using Abelmoschus esculentus (okra) mucilage. The NPs were characterized by Fourier transform infrared spectroscopy, Fourier transform-Raman, X-ray photoelectron spectroscopy, ultraviolet-visible spectroscopy, X-ray diffraction (XRD), thermogravimetry, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, high resolution transmission electron microscopy, and zeta potential analyses. The XRD pattern confirmed the hexagonal wurtzite structure of ZnO. The morphology of the NPs was uneven where they comprised heterogeneous particles with uniform spheres that had an average size of 29 nm, and elongated and rod-like structures measuring 70 nm. We proposed a possible mechanism for the formation of Zn5(OH)6(CO3)2 micro-flakes and ZnO. The photocatalytic activities of the synthesized ZnO NPs was tested during the degradation of organic dyes comprising methylene blue, rhodamine B, Congo red, and methyl orange in aqueous solutions. The ZnO NPs were capable of the selective photodegradation of the target cationic dyes, where 125 mg of the catalyst removed 100% of the methylene blue solution (32 mg/L) within 60 min and 100 mg was required for the complete removal of rhodamine B (9.5 mg/L) within 50 min. Liquid chromatography-mass spectrometry analysis was conducted to confirm the photodegradation results. Thus, we developed a facile, economic, and green method for the production of ZnO for use as a photocatalyst.
关键词： Abelmoschus esculentus,Photocatalytic study,ZnO nanoparticle
更新于2025-11-14 15:16:37
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Photoactive ZnO nanosuspension for intensification of organics contaminations decomposition
摘要： In this work the photoactive properties of the aqueous suspension containing ZnO nanoparticles and zinc nitrate have been studied. The mechanism of organics photodecomposition at the presence of prepared suspension was studied by the measurements of spectral dependencies of Chicago Sky Blue dye photodecomposition. It was found that dye photodecomposition proceeds in three different photochemical processes: 1) the direct photodecomposition of organic molecules; 2) oxidation of dye molecules by reactive oxygen species which are the product of nitrate anions photodecomposition; 3) photocatalytic action of ZnO nanoparticles.
关键词： ZnO,Nanoparticle,Photocatalytic properties,Zinc nitrate
更新于2025-09-23 15:21:01
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Nano-to-Microporous Networks via Inkjet Printing of ZnO Nanoparticles/Graphene Hybrid for Ultraviolet Photodetectors
摘要： Inkjet-printed photodetectors have gained enormous attention over the last decade. However, device performance is limited without post-processing, such as annealing and UV exposure. In addition, it is difficult to manipulate the surface morphology of the printed film using an inkjet printer due to the limited options of low viscosity ink solutions. Here, we employ a concept involving the control of the inkjet-printed film morphology via modulation of co-solvent vapor pressure and surface tension for the creation of a high-performance ZnO-based photodetector on a flexible substrate. The solvent boiling point across different co-solvent systems is found to affect the film morphology, which results in not only distinct photo-response time but also photo-detectivity. ZnO-based photodetectors were printed using different solvents which display a fast photo-response in low-boiling point solvents due to the low carbon residue and larger photo-detectivity in high-boiling point solvent systems due to the porous structure. The porous structure is obtained using both gas-liquid surface tension differences and solid-liquid surface differences, and the size of porosity is modulated from nano-size to micro-size depending on the ratio between two solvents or two nanomaterials. Moreover, the conductive nature of graphene enhances the transport behavior of the photocarrier, which enables a high-performance photodetector with high photo-responsivity (7.5*102 AW-1) and fast photo-response (0.18 s) to be achieved without the use of high-boiling point solvents.
关键词： Inkjet print,photodetector,ZnO nanoparticle (NP),flexible devices,microporous
更新于2025-09-23 15:19:57
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Effect of tiny amount of zinc oxide on morphological and thermal properties of nanocomposite PEBA thin films
摘要： Novel PEBA-based nanocomposite thin films were prepared with different low concentrations of ZnO and characterized by AFM, FTIR, FESEM, DSC and TGA. AFM images indicated that the surface roughness of films increased by ZnO loading. FTIR spectroscopy revealed interaction between PEBA polymer and ZnO nanoparticles: The results presence of physical showed that ZnO nanoparticle undergoes an interaction with the CAOAC groups of the PEBA soft segments. DSC analysis showed that incorporation of ZnO caused substantial influence upon the thermal transition of the polyether domain of polymer. TGA showed a significant enhancement of the film thermal properties with ZnO loading. The loading of 0.5 wt% ZnO showed much better dispersion than 1.0 wt% ZnO, while the nanoparticle agglomeration for the latter was observed.
关键词： Nanocomposite thin film,ZnO nanoparticle,Thermal properties,PEBA
更新于2025-09-19 17:15:36
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ZnO-CNT Nanostructures as Potential Materials for Non-Enzymatic H <sub/>2</sub> O <sub/>2</sub> Sensing
摘要： Hydrogen peroxide (H2O2) is widely used as an antibacterial, bleaching, decoloring, and oxidizing agent in various industrial fields. However, the exposure to and accumulation of high levels of H2O2 can cause oxidative stress to humans, leading to caducity and diseases due to its unstable and toxic nature. Moreover, H2O2 is a useful indicator for monitoring reactive oxygen species-related diseases in humans because it is generated as an intermediate product of many enzymatic reactions in normal aerobic metabolism. It is therefore essential to develop accurate and reliable methods of detecting H2O2 for industrial and biological purposes. Among the recently established methodologies, non-enzymatic amperometric detection of H2O2 has raised considerable attention owing to its high sensitivity, low cost, ease of operation, and quick response. To improve the electrochemical performance of this method, various redox mediators, especially noble-metal-containing substrates, have been used to fabricate chemically modified electrodes for the non-enzymatic amperometric detection of H2O2. Recently, we have reported many applications of metal oxide-decorated sp2-hybridized carbon nanostructures. Building on our previous studies, we describe herein the use of zinc oxide–carbon nanotubes (ZnO-CNT) for the preparation of modified electrodes exhibiting enhanced electrocatalytic activity for H2O2 reduction.
关键词： Amperometry,H2O2 reduction,ZnO nanoparticle,CNT,Biosensor
更新于2025-09-10 09:29:36
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Facile fabrication and optimization of bowl-like ZnO/CdS nano-composite thin films with hierarchical nanopores and nano-cracks for high-performance photoelectrochemistry
摘要： A special nano-structured composite ZnO/CdS thin film with hierarchical nanopores and nano-cracks has been synthesized by a facile two-step method for the first time, in which both loadings of ZnO and CdS are optimized. We first fabricated the hierarchical nano-porous ZnO thin film through rapid gas/liquid interface assembly and layer-by-layer transfers of bowl-like ZnO nanoparticles for thirteen times. The ZnO nanobowls are prepared by a simple solution chemical reaction without using any templates. After annealing, the assembled ZnO film is sensitized with CdS nanoparticles by successive ionic layer adsorption and reactions for six cycles. Nano-cracks form for the ZnO/CdS nano-composite film by calcination, which is due to the different thermal expansion behavior between the ZnO film and the CdS layer. The facilely optimized ZnO/CdS films can serve as a promising photoanode in a photoelectrochemical cell, and it can generate a saturated photocurrent density as high as 7.8 mA cm?2 at ?0.9 V (vs. Hg|Hg2SO4|saturated K2SO4) under visible light illumination of 100 mW cm?2 in an aqueous solution of 0.5 M Na2S, corresponding to a solar-to-electricity conversion efficiency of 6.6%.
关键词： Nano-crack,CdS,Bowl-like ZnO nanoparticle,Gas/liquid interface assembly,Hierarchical nanopores,Photoelectrochemistry
更新于2025-09-10 09:29:36