Figure - available from: Clean Technologies and Environmental Policy
This content is subject to copyright. Terms and conditions apply.
Source publication
An economical and easy one-step method for the biosynthesis of highly stable molybdenum trioxide (MoO3) nanoparticles was developed using gum arabic as a bio-template; ensuing nanoparticles (NP) were characterized by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, UV–visible spectroscopy, transmission el...
Citations
... ln (A t /A 0 ) = ln (C t /C 0 ) = -K app t where K app is the observed rate constant and A 0 and A t are the beginning and temporal concentrations of dyes at time t [29]. The reaction of decomposition rate could be observed by the pseudo-first order kinetics and the deterioration rate constant evaluated from the linear conversion 9(j-l)). ...
The exceptional photocatalytic characteristics of transition metal oxides, mostly linked to reversible redox processes, have drawn significant interest to combinatorial techniques in their preparation as nanostructures. The purpose of this work is to describe an environmentally prudent method of producing α-MoO3 nanorods utilizing Rhinacanthus nasutus leaf extract. A detailed analysis of the products as XRD, micro-Raman spectroscopy revealed that they have orthorhombic structure and utterly pure. The bioinspired α-MoO3 BNRs (bio-nanorods)
exhibit great photodegradation process in UV–vis light and reflect an optical bandgap of 2.5 eV. Morphology and
existence of functional groups were studied by SEM, FT-IR and EDAX spectral analysis. Tests on the antimicrobial activity of α-MoO3 BNRs reveal remarkable action against gram positive, gram negative and fungal strains. The detection of reactive oxygen species (ROS) produced by nanorods and the determination of hazardous dyes photodegradation inhibition owing to the presence of ROS scavengers were used to explore the α-MoO3 BNRs decolouration mechanism. The photodegradation of triple cationic dyes makes it clear that, when exposed to UV–vis light, α-MoO3 BNRs demonstrates a significantly higher degradation efficiency. From an energy and cost saving perspective, this study presents a novel idea for environmental cleanup.
... The O-Mo-O scissoring and bending mode of MoO 3 occur at 360 cm −1 [28]. The peak at 286 cm −1 (B 2g , B 3g ) occurs due to the wagging modes of the terminal oxygen atoms [29]. The peak at 381 cm −1 represents the A g mode [30]. ...
The main objective of the present work is to investigate the role Mo thickness in growth of nanostructured MoO3 and their application for optical sensors like photodetectors. The devices were fabricated using standard scalable microfabrication techniques. MoO3 was synthesized by Mo thin film deposition using sputtering followed by dry oxidation at 550oC. Further, these samples were tested as photodetectors for visible regions. The test results confirm that the devices are more sensitive towards 450 nm. The photodetector made on 80 nm Mo thickness exhibited a higher responsivity of 730 mA/W, higher detectivity of 2.47×1011 Jones, and higher photo to dark current ratio (PDCR) of 1.33×102 compared to other tested samples. Moreover, the optimized photodetector showed higher repeatability and a faster speed of 13/11 ms. These developed photodetectors could be vital for the visible light optical sensing era.
... Various chemical methods have been used to synthesize nanomaterials [13]; however, the chemicals used in these synthesis routes are absorbed on the photocatalyst surface, enhancing the toxicity of the nanomaterials [14] to the environment, which overshadows their great success in the degradation of organic pollutants [15]. To enhance the properties of nanomaterials without using chemicals, extracts of plants and plant materials [16] provide a cost-effective, ecofriendly, less toxic, and safe source for the synthesis of nanomaterials [17,18], including phenolic compounds, tannins, and flavonoids, which play a critical role in treatment [19]. ...
The development of environmental remedies using ecofriendly and green technologies is attracting increasing research attention. Herein, the green synthesis of molybdenum oxide (MoO3) nanoparticles (NPs) using extract of selected Asteraceous flora species is reported for the first time along with the investigation of the degradation ability for organic pollutants and pollen morphological characteristics of wetland species of the family Asteraceae. An X-ray diffraction analysis confirmed the formation and crystalline structure of the MoO3 NPs. Fourier transform infrared spectra of Lactuca Serriola extract indicated the presence of capping agents, reducing agents, and phytochemicals. Scanning electron microscopy images revealed the almost spherical shape of the MoO3 NPs. A qualitative and quantitative palynological investigation of 21 species belonging to 12 genera of the Asteraceae from different wetlands of Azad Jammu and Kashmir is also reported. The MoO3 NPs degraded 99% of crystal violet dye within 30 minutes with a degradation rate of 0.022 min −1. The cost-efficient and green synthesis method for MoO3 NPs with high catalytic activity provides a new platform for the development of photocatalysts. ARTICLE HISTORY
... Various chemical methods have been used to synthesize nanomaterials [13]; however, the chemicals used in these synthesis routes are absorbed on the photocatalyst surface, enhancing the toxicity of the nanomaterials [14] to the environment, which overshadows their great success in the degradation of organic pollutants [15]. To enhance the properties of nanomaterials without using chemicals, extracts of plants and plant materials [16] provide a cost-effective, ecofriendly, less toxic, and safe source for the synthesis of nanomaterials [17,18], including phenolic compounds, tannins, and flavonoids, which play a critical role in treatment [19]. ...
... For instance, Rana and coworkers investigated the greener synthesis of nature-inspired metal NPs [29,30]; other studies based on the greener alternatives have been evaluated [31,32]. The importance of greener synthesis for sustainable fabrication of various metal NPs in terms of cleaner production encouraged us to comprehensively deliberate the recent progress in this domain using locally available abundant plant materials [33,34]. In recent years, a huge number of metal NPs of diverse sizes and shapes have already been synthesized via the greener synthesis approach using plant materials. ...
... These peak assignments agree with the spectra reported in the literature. [50][51][52]. ...
Vehicular SOx emissions have a huge detrimental impact on public health, catalytic converters, and the environment. Developing strategies to remove sulfur from diesel and thus safeguard the above is imperative. A series of SnO2–MoO3 mixed oxides and mono oxides MoO3 and SnO2 were prepared by soft template method, calcined at 450 °C and successfully tested in model diesel oxidative desulfurisation (ODS). The impact of the SnO2/MoO3 mole ratio (hereinafter denoted as Sn/Mo) on catalytic efficiency was investigated, among other catalytic parameters. The obtained samples were analyzed using X-ray diffraction (XRD), Raman spectrocscopy, scanning electron microscopy (SEM), N2-physisorption and titration method for acidic properties. The study demonstrates that mixing SnO2 and MoO3 improves acidic sites, crystallinity, and morphological properties of pure SnO2. The addition of MoO3 increased oxygen vacancies and the surface area of SnO2. High acidic site densities of 49.3, 47.4, and 46.7 mEqg−1 were observed for the catalysts with 2:1, 1:1, and 1:2 Sn/Mo mole ratio, respectively. The catalytic efficiency increased with an increase in Sn content with the highest catalytic efficiency of 99.8% for the dibenzothiophene (DBT) oxidation achieved in 30 min for Sn/Mo (2:1) catalyst compared to 92 and 70% for Sn/Mo 1:1 and 1:2 catalysts, respectively. The rate constant for the reaction was 0.057 min−1, which is eight times that of MoO3; 0.007 min−1 and three times that of SnO2; 0.017 min−1. The ODS mechanism utilizing the SnO2–MoO3 catalyst was proposed. The prepared SnO2–MoO3 catalyst demonstrated a high potential for industrial desulfurisation applications.
... The Raman spectrum of MoO 3 is shown in Fig. 1f. The Raman peaks were found to be consistent with previously reported values [30]. The Raman band between 600 and 1000 cm -1 primarily originates owing to the stretching vibrations of the MoO 6 octahedron. ...
In this study, WO 3 nanoparticles and MoO 3 nanoribbons were prepared using a microwave-assisted hy-drothermal method. Following a grinding treatment, a stable WO 3 /MoO 3 suspension having a nanoheter-ojunction structure was obtained. Moreover, oxygen vacancies were introduced in the MoO 3 nanoribbons (MoO x) during the grinding process. Consequently, the ground WO 3 /MoO x composite film exhibited an enhanced electrochromic (EC) performance compared to the ground WO 3 and MoO 3 films not only due to its favorable morphology for ion transport but also the enhanced intervalence electron transfer. To further evaluate the potential of ground WO 3 /MoO x electrodes for practical applications, a complementary elec-trochromic device (ECD) was constructed using ground WO 3 /MoO x and polyaniline:poly(4-styr-enesulfonate) (PANI:PSS) as cathodic and anodic coloring materials, respectively. This complementary ECD yielded a transmittance modulation of 55.4% at 650 nm with rapid switching times of 7.4 s (bleaching) and 3.6 s (coloring). The ECD also exhibited a high coloration efficiency of 154 cm 2 /C and a high cycling stability with an 80.6% transmittance retention after 2000 cycles. These results demonstrate that ground WO 3 /MoO x composites are attractive materials for fabricating high-performance ECDs.
... MoO 3−x , for Au NPs, which has not been reported in the literature yet. The semiconducting oxides MoO 3−x [28,29] with a median bandgap are widely used in optics, electronics, photocatalysis [30,31], sensor [32], and energy storage [33] due to their unique layered structure, variable valence states, and specific electronic structure. Most importantly, MoO 3−x was found to be a surface plasmon-active material with useful light−matter interactions [34]. ...
Using solar energy to enhance the transformation rate of organic molecules is a promising strategy to advance chemical synthesis and environmental remediation. Plasmonic nanoparticles responsive to sunlight show great promise in the catalysis of chemical reactions. In this work, we used a straightforward wet-chemistry method to synthesize plasmonic octahedral gold nanoparticles (NPs) coated with thin molybdenum oxide (MoO3-x), Au@MoO3-x NPs, which exhibited strong surface plasmon resonance in a broad wavelength range. The synthesized Au@MoO3-x NPs were characterized by UV-Vis, SEM, TEM, EDS, XPS, and the electrochemical technique of cyclic voltammetry (CV). The catalytic performance of Au@MoO3-x NPs under visible light irradiation was investigated using the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) as a model reaction. The presence of a thin capping layer of MoO3-x on our Au NPs contributed to the broadening of their range of absorption of visible light, resulting in a stronger intra-particle plasmonic resonance and the modulation of surface energy and electronic state. Accordingly, the kinetics of plasmon photocatalytic transformation of 4-NP to 4-AP was significantly accelerated (by a factor of 8.1) under visible light, compared to uncapped Au NPs in the dark. Our as-synthesized Au@MoO3-x NPs is an example that the range of plasmonic wavelengths of NPs can be effectively broadened by coating them with another plasmon-active (semiconducting) material, which substantially improves their plasmonic photocatalytic performance. Meanwhile, the synthesized Au@MoO3-x NPs can be used to accelerate the transformation of organic molecules under visible light irradiation.
... The cytotoxic effects of the NP were measured using 2,3-bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide assays in Hep G2 (human liver cancer) and HEK293 (human embryonic kidney) cell lines. MoO 3 nanoparticles are benign to Hep G2 cell lines and have low toxicity even at extremely high concentrations (1000 ppm), but have significant toxicity to HEK293 cells, according to the findings of this study [15]. ...
Recently, there have been various chemical carriers and routines for treatment of infections. Plant gum nanoparticles are being used greatly for this purpose. They have several advantages over chemical drug carriers including being biodegradable, biocompatible, nontoxic, providing better tolerance to the patient, and having fewer side effects. They also do not cause allergies in humans, do not irritate the skin or eyes, and have low production costs. The use of plant gums as drug carriers is limited due to a series of disadvantages. They may have microbial contamination because of the moisture in their content. Also, in storage, their viscosity decreases due to contact with water. By green nanoparticle synthesis of these plant gums as drug carriers, the disadvantages can be limited. There are several studies showing that plant gum drug carriers can have a great combination with various drugs and nanoparticles, thus they could be extremely effective against multi-resistant bacteria and even systemic illness like cancer. These days, the need for green synthesis of medicine and drug carriers has become quite popular and it will be even more essential in the future because of emerging antibiotic-resistant bacteria and climate change.
... TEM analysis clearly indicates formation of spherical shaped NPs with few nanometers in thickness. ED x-ray spectroscopy was used to confirm the elemental composition of the nanostructure and no impurities were found in the structure [66]. Abbbasifer, ValizadehKaji and Iravani reported fabrication of Mo-NPs by vermicompost extract that causes reduction of Mo-ions. ...
... The prepared MoO 3 NPs were analyzed showing the stretching and bending of CeO and NeH bonds corresponds to the existence of gum arabic. XRD results showed an orthorhombic crystal system of MoO 3 along with sharp distinctive peaks in specified regions [66]. ...
In the scope of the rapid technological advancements, nanoparticles (NPs) have gained prominence due to their excellent and tunable biological, and physicochemical properties. Nowadays, different methods are used for their synthesis. In particular, the green synthesis of metal precursors for the synthesis of NPs, represents a cost-effective, environmentally friendly, and hazardous chemical-free method for developing a large variety of NPs. By exploiting plant extracts, the production rate of NPs is relatively faster. Due to fossil reserves and high fuel consumption, renewable and clean energy materials are urgently needed to improve environmental sustainability. With outstanding electrochemical and physicochemical characteristics, molybdenum-based NPs (Mo-NPs) are gaining increasing attention in the fields of energy conversion and storage. Considering the significance of Mo-NPs synthesized from greener routes and their energy applications, it is necessary to review recent trends and developments in this field. This review summarizes important research studies and future research guidelines for the preparation of Mo-NPs through green routes and their applications to meet global energy and environmental demands. Moreover, future research directions are also highlighted to achieve sustainable greener precursors and Mo-NPs based energy storage devices.
