Investigation of Catalytic Property of Plant Mediated Silver Nanoparticles as Degradation of Toxic Dyes in Water (original) (raw)
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Oriental Journal of Chemistry, 2020
Green synthesis of nanoparticles is more preferable because of its flexibility in preparation as well as its capability to avoid utilization of toxic chemicals. This study was designed to synthesize silver nanoparticles from plant leaves of Calendula officinalis for utilizing it for the degradation of commonly used dyes. The maximum absorption of UV-Vis light at 436nm ensured the synthesis of silver nanoparticle. The various reducing agent present in plant leaves extract cause the formation of silver nanoparticles as ensured by the FTIR. The morphology study showed that the synthesized nanoparticles were 50-60 nm and 140-150 nm in size for 1mM and 2mM silver nanoparticles (Ag NPs) respectively. It has also been observed that the synthesized nanoparticles possess a high catalytic activity for the degradation of both methylene blue and methyl orange. The degradation data ensured that the reaction rate of degradation is size dependent and the highest degradation percentage (69.79% within 5 minutes), degradation rate (0.18 ± 0.03 min-1), half-life (T 50 = 3.85 min) and 80% degradation (T 80 = 8.94 min) was observed for 1mM Ag NPs in case of methyl orange.
Degradation Of Synthetic Dyes By Green Synthesis Of Silver Nanoparticles Using Leaf Extract
International Journal of Engineering Technology and Management Sciences, 2023
The Textile effluent toxicity is currently a worldwide concern. To address this issue, this study introduced a low-cost, environmentally friendly technique for toxic dye adsorption. Green synthesis has gotten a lot of attention in materials science as a reliable, sustainable, and environmentally friendly method for making a variety of materials/Nano-materials, such as metal/metal oxide nanomaterial's, hybrid materials, and bio inspired materials. As a result, green synthesis is seen as an important tool for reducing the harmful effects of traditional method. When the aqueous leaf extract was added to the silver nitrate solution, the reaction medium's color changed from pale yellow to brown, indicating that the silver ions were reduced to silver nanoparticles. The UV-Vis spectrophotometer was used to identify the synthesized silver nanoparticles. Scanning electron microscope (SEM) was used to examine dispersion and morphology. The effective functional molecules responsible for the reduction and stabilization of silver nanoparticles synthesized by leaf extract were identified using the FESEM and FTIR spectrum. The present experimentation carried out in a batch process using sorption method. The optimization studies are pH, concentration, temperature and the green synthesized silver nanoparticles effectively degraded the dye by nearly 95 percent.
Degradation of AZO dye using plants based silver nanoparticles through ultraviolet radiation
Journal of King Saud University - Science, 2019
The present study evaluates the different plant mediated green synthesis of silver nanoparticles which was used to degrade the AZO dye through UV light. The degraded dye was analyzed by UV/Vis spectrophotometer. The AZO dye was highly degraded by the coconut tree inflorescence extract based Ag-NPs, was performing as an excellent catalyst under UV photo catalytic dye degradation method.
2021
In this study, green synthesis of silver /silver oxide nanoparticles was successfully prepared from Phoenix Dactylifera L aqueous leaves extract. The effect of different volume ratio (% v/v) (Plant extract / Precursor) on the nanoparticles silver /silver oxide nanoparticles formation, optical properties, and catalytic activity for dye degradation was studied. The obtained Ag/Ag2O nanoparticles were characterized using various techniques, such as UV-Visible, FT-IR, XRD, SEM for this purpose. The UV-Vis spectrum shows the absorption at 430 nm associated with Ag/Ag2O NPs. The optical bandgap values were found to be in the range of 3.22 to 4.47 eV for the direct bandgap and 3.73 to 5.23 eV for the indirect bandgap. The functional groups present in plant extracts were studied by FTIR. XRD confirmed the crystalline nature of Ag / Ag2O NP, and its average particle size was between 28.66-39.40 nm. SEM showed that the green synthesized silver/silver oxide nanoparticles have a spherical shape...
Sustainable Environment Research, 2017
Green synthesis processes are regarded as safer alternative to usual physical, chemical and microbial methods due to their cost effectiveness, environmental friendly nature and easy handling. In the present study, an eco-friendly and facile method for biogenic synthesis of silver nanoparticles (AgNPs) has been developed using fruit extract of Gmelina arborea, an abundantly available medicinal plant in North Eastern region of India. The prepared AgNPs were characterized by UVeVis spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction pattern and energy dispersive X-ray spectrum. TEM studies showed the as-synthesized AgNPs were stable, almost spherical and crystalline with the particles size varying from 8 to 32 nm. The average diameter of the particles was 17.0 ± 1.6 nm. The catalytic effectiveness of the prepared green catalyst, AgNP, was also investigated in catalytic degradation of Methylene Blue (MB) dye. The catalytic degradation reaction was completed within 10 min, signifying excellent catalytic properties of silver nanoparticles in reduction of MB.
Journal of Molecular Liquids, 2020
The preparation of nanoparticles from biological materials is an economic and environmentally friendly strategy with several advantages. The current study is focused to synthesize silver nanoparticles using Petroselinum crispum plant extract. Various characteristics of biologically synthesized AgNPs were determined with UV-Visible (UV/Vis) Spectroscopy, X-ray Diffraction (XRD), Fourier Transform Infrared (FTIR) Spectroscopy, and High-Resolution Transmission Electron Microscopy (HRTEM). The plasmonic resonance peak at 425 nm ensured the formation of AgNPs. The FTIR analysis showed that the as-synthesized particles contain alcoholic and polyphenolic constituents, which are responsible for their capping and reduction. The HRTEM results revealed spherical shape of AgNPs with size ranging from 25 to 90 nm. The as-synthesized particles demonstrated excellent antibacterial properties against Gram positive and Gram-negative bacteria. The antioxidant applications of the particles were determined with 2,2-diphenyle-1-picrylhydrazyl (DPPH). Moreover, the photocatalytic application of the synthesized AgNPs was evaluated for brilliant green dye (BG). The results demonstrated high degradation of BG due to small size and well-dispersed nature of AgNPs. Degradation products of BG were identified to suggest degradation pathways. The eco-toxicity of the BG and constituents derived from the dye were studied with Ecological Structure Activity Relationship (ECOSAR) software.
Applied Nanoscience, 2020
The development of effective photocatalyst through green and eco-friendly approach has become a great concern for the light-induced degradation of organic pollutant dyes. This article reports a simple, cost-effective, and a benign environmental biosynthesis of Ag nanoparticles (NPs) using Cyperus pangorei, a plant extract with three different concentrations of AgNO 3 in aqueous media. The synthesized silver nanoparticles were performed ultraviolet-visible spectroscopy (UV-Vis), Fouriertransform infrared spectroscopy (FTIR), X-ray diffraction (XRD), photoluminescence (PL), transmission electron microscope (TEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS). The surface plasmon resonance (SPR) peak at 437 nm in UV-Vis spectroscopy confirmed the reduction of Ag + ions into Ag nanoparticles. FTIR spectra revealed that plant extract could reduce/stabilize/capping to form Ag nanoparticles, and strong PL emission spectra tend to exhibit higher photocatalytic activity. The structural information is derived from XRD and TEM, which can exhibit the FCC structure and polydisperse with the spherical shape. EDX addresses the presence of Ag constitute. XPS confirmed the Ag nanoparticles in characteristic silver peaks, plant extract derivatives, and their oxidative states' binding energy. The photocatalytic activity of Ag nanoparticles against dye Rhodamine B (Rh-B) under ultraviolet irradiation with periodic interval and pseudo-first-order kinetics were also studied. The obtained results show that the synthesized Ag nanoparticles can degrade dye (Rh-B) up to 86% within 2 h of irradiation time. Furthermore, the present study suggests that the biosynthesized Ag nanoparticles could be potential photocatalysts against various industrial dyes as well as C. pangorei; plant extract can be usto modify and develop more efficient nano-photocatalyst for other application.
MATEC Web of Conferences, 2016
Biosynthesis of metal nanoparticles is gaining more importance owing to its simplicity, economical, sustainable route of synthesis of nanoparticles and ecofriendliness. Based on the search to improve and protect the environment by decreasing the use of toxic chemicals and eliminating biological risks in biomedical applications, the present article reports an environment friendly and unexploited methods for biofabrication of silver nanoparticles (AgNPs) using Raphanus sativus leaf extract. The synthesized AgNPs were characterized by UV-vis spectroscopy and transmission electron microscopy (TEM). The absorption spectrum of the dark brown color silver colloids showed a single and prominent peak at 431nm, indicating the presence of AgNPs. Further, catalytic degradation of methylene blue (organic dye) by using AgNPs was measured spectrophotometrically. The results revealed that biosynthesized AgNPs was found to be impressive in degrading methylene blue and can be used in water purification systems.
Shape, size and dispersion of plant-driven silver nanoparticles for removal of methylene blue dyes
Journal of Physics: Conference Series, 2019
Silver nanoparticles (AgNPs) were synthesized by green biological technique utilising kyllinga brevifolia extract (KBE) as reducing agents. The KBE was also found to be a good capping as well as stabilizing agent. The size, shape and dispersion of AgNPs were evaluated and compared with the results from the literature survey. The TEM image showed that KBE-driven AgNPs have quasi-spherical shape are highly dispersed with an average particle size ~17.64 nm. The catalytic activity of KBE-driven AgNPs on reduction of methylene blue (MB) using sodium borohydride (SB) was analysed using UV-vis spectroscopy. The MB removal was achieved 100% at pH 8-10. The efficient removal is proposed to be due to the process of reduction via electron relay effect.
Silver nanoparticles for enhanced dye degradation
Current Research in Green and Sustainable Chemistry, 2021
Dye wastewater discharged after improper treatment is very harmful for environment and living creatures. As per mandate, the dye wastewater should be treated well in order to prevent any negative effects after discharge. Although there are various methods which are in use, however most of these methods have some or the other associated disadvantages i.e., high cost, generation of secondary pollutants, low efficiency, complexity etc. The objective of this study is to identify the dye degradation (orange and blue dye-individually/mixture) potential of chemically synthesized silver nanoparticles (CH-AgNPs) along with NaBH 4. Literature studies highlighted the efficacy of AgNPs for individual dye degradation, however it is very important to study the degradation potential of nanoparticles in presence of dye mixture (to mimic the natural wastewater condition). In the present study, the rapid synthesis of silver nanoparticles (CH-AgNPs) was obtained by using trisodium citrate solution. The developed CH-AgNPs were examined for UV-vis Spectrophotometry (maxima-422 nm), Zeta Potential (À6.70 mV), and Transmission Electron Microscopy (spherical shape with size range of 8-40 nm), highlighting the nano-size and stability of synthesized CH-AgNPs. For catalytic activity, CH-AgNPs and NaBH 4 were tested for dye degradation potential for Orange and Blue dyes individually and in mixture (orange þ blue dye). It was observed that with increase in dye concentration from 50 ppm to 200 ppm, NaBH 4 showed 28% and 25% removal for blue and orange dyes, respectively. However, when CH-AgNPs þ NaBH 4 was used, up to 100% degradation was obtained from blue dye, however the degradation of orange dye has shown 97.4% degradation. Further, as the wastewater contains multiple dyes, therefore in dye mixture studies (orange þ blue dye-50 ppm), 100% degradation was achieved with NaBH 4 þCH-AgNPs in just 5 min, highlighting the efficient catalytic ability of NaBH 4 þAgNPs. The results clearly highlighted the potential of CH-AgNPs in enhancing the dye degradation of orange and blue dyesindividually and in mixture, therefore the present study is relevant for further research to identify the best dye degradation agents, especially in presence of dyes mixture.