Synthesis of silver nanoparticle from Vigna unguiculata stem as adsorbent for malachite green in a batch system (original) (raw)
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International journal of Pharmacy and Pharmaceutical Sciences, 2014
Objectives: The objectives of the present study were a) to optimize the parameters for the AgNPs synthesis using aqueous leaf extract of Aegle marmelos b) to evaluate the performance of AgNPs as nanosorbents of synthetic dye Malachite Green c) to investigate the performance of AgNPs as nanocatalysts in the reduction of Malachite Green. Methods: The effects of parameters such as leaf extract concentration and pH were studied by varying the leaf extract concentration from 5% to 20 % and reaction pH from 3 to 8 respectively. Under optimized leaf extract concentration and pH, AgNPs were synthesized and subjected to biosorption of Malachite Green from aqueous environment. Influence of pH, sorbent dosage and contact time on sorption of dye was investigated. In addition, the Catalytic activity of AgNPs in reduction of the synthetic dye using aqueous leaf extracts of Aegle marmelos was also investigated. Results: The UV-visible absorption spectra of the AgNPs exhibited distinct band around 400-460 nm. 20% leaf extract concentration and pH 7 were found to be the optimum conditions for synthesis of AgNPs. Sorption studies on influence of pH, sorbent dosage and contact time showed maximum adsorption at pH 5, 0.3 g and 4 h respectively. The UV visible spectra of the reaction mixture containing aqueous leaf extract of Aegle marmelos, Malachite Green and AgNPs confirmed the catalytic degradation of Malachite Green. Conclusion: Our study revealed that AgNPs synthesized using aqueous leaf extract of Aegle marmelos can be used as nanosorbents and nanocatalysts in treatment of dye containing wastewater.
CERN European Organization for Nuclear Research - Zenodo, 2012
The present study deals with the adsorption of Brilliant Green (BG), a cationic d)'e, on alginate stabilized silver nanoparticles beads. Silver nanoparticles were prepared by a simple green method. The microwave irradiation process was applied to the preparation of alginate stabililed silver nanoparticles. The alginate gel is as both reducing and stabilizing agent. The resulting silver nanoparticles were characterized by scanning electron microscope (SEM), UV-Vis spectroscopy and Fourier transform infrared (FTIR) spectroscopy. Batch studies were performed to evaluate the influences of various experimental parameters like initial concentration, contact time and initial pH on the removal of BG. Optimum conditions for BG removal were found to be solution of pH-3 and equilibrium time-40 min for the initial concentration range of 5-30 mg/L. The mathematical description of the bio~orption equilibrium and i~otherm constant were evaluated by Freundlich and Langmuir adsorption isotherm models. Equilibrium data fitted very well with both Freundlich and the Langmuir models. The pseudo first and second order kinetic models were also applied to the experimental data. The maximum sorption capacity of alginate stabilized silver nanoparticles for BG at 5 ppm test level was found to be 99% at room temperature.
Nigerian Journal of Life Sciences, 2023
The study was undertaken to assess the application of myco-fabricated silver nanoparticles in the adsorption of Malachite green and Trypan blue from an aqueous solution. The cell biomass suspensions of fungal endophytes isolated from the leaves of Mannihot esculenta and Carica papaya were used in the silver nanoparticles. The method involved in nanoparticles characterization, decolourization and adsorption treatment efficacy used UV-spectroscopy FT-IR, XRD and SEM, spectrophotometric analysis and phytotoxicity testing. The result revealed that the endophyte strains PDA 1 and PDA 2 were identified as Aspergillus niger and Aspergillus fumigatus. There was colour change from colourless to dark brown revealing the biogenic synthesis of silver nanoparticles due to the formation of clumps after 24 hr. The peaks observed in FT-IR spectra reflect the role of metabolites (functional groups) which act as capping and reducing agents. The UV-Vis spectral result showed the maximum peak of PDA 1 to be 620 nm at 0.933 absorbance while that of PDA 2 were 300 nm and 450 nm at 0.684 absorbance revealing the surface plasmon resonance. The XRD peaks of the nanoparticles were clearly distinguishable and broad indicating an ultra-fine nature. The microscopic characterization of PDA 1 and PDA 2 showed the presence of flake type, a smooth and irregularly shaped granulated compact powder with bright facets. The results of the decolourization profile showed that the adsorption efficiencies of both dyes were significantly concentration and time-dependent (P < 0.05). These findings suggest the potential of these nanoparticles in the environmental remediation of harmful dyes.
Heliyon, 2020
An environmentally benign, one-pot and highly scalable method was presented to produce biogenic silver nanoparticles (Ag NPs) using the solid-state synthetic route. Four plant-derived candidate bio-reductants (i.e., Datura stramonium, Papaver orientale, Mentha piperita, and Cannabis sativa) were investigated to compare the efficiency of solid-state route and typical solution method. M. piperita was selected as the best plant resource to produce totally pure and uniform Ag NPs (average diameter of 15 nm) without any aggregation. The purity and size of biogenic Ag NPs, were tailored by adjusting the M. piperita leaf powder/silver nitrate weight ratio and temperature. The as-synthesized Ag NPs were effectively utilized as an eco-friendly nanoadsorbent in water remediation to remove a model dye (i.e., crystal violet). The key factors affecting on the sorption process (i.e., nanoadsorbent dosage, temperature, pH, dye initial concentration, and shaking time) were investigated. The pseudo-second-order kinetic model was well fitted to the sorption process and at the optimum sorption conditions, based on the Langmuir model, the adsorption capacity was found to be 704.7 mg/g. The current, cost effective and feasible method could be considered as an applicable strategy to produce green, reusable and proficient Ag NPs as nanoadsorbents for removal of dyes from contaminated water.
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.
Journal of Molecular Liquids, 2017
The focus of the present work is on exploiting the excellent structural properties of the nanomaterials. More specifically, it is demonstrated that Ag nanoparticles (AgNPLs) chemically immobilised onto activated carbon (AC-AgNPLs) can act as an effective solid sorbent for removal and/or minimisation of selected crystal violet (CV) dye from aqueous solutions by conducting experiments on water samples. Spectroscopic tools such as FTIR, SEM, TEM and XRD were used in the characterisation of the adsorbent before and after adsorption. The adsorbent dose, pH, contact time, rotation velocity, initial concentration of adsorbate and the temperature effects were examined to evaluate their role in the percentage elimination of crystal violet. Crystal violet uptake was favourable in alkaline media at pH N 7.0, while the Langmuir model revealed CV monolayer adsorption capacity of 87.2 mg/g. The pseudo second-order model fitted the data well and the thermodynamic parameters (ΔH, ΔS, and ΔG) of CV retention revealed that the uptake is endothermic and spontaneous in nature. When AC-AgNPLs was utilised, it removed a greater CV percentage from aqueous solution relative to AC. The mechanism of adsorption was explored using the intra-particle diffusion model and the liquid-film model. Desorption studies were made to elucidate recovery of the adsorbate and adsorbent for the economic competitiveness of the removal system. The AC-AgNPLs was successfully recycled for seven successive adsorption-desorption cycles indicating its high reusability.
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.
Journal of Mountain Research, 2021
Nowadays, silver nano-compounds mediated by plant materials are widely used material in daily life chemistry as well as across the industries, medical, electronics, ceramics, and in all research fields, because it has some specific characteristics such as non-toxic, inexpensive, nature-friendly, heat resistant, catalytic activity, high electric conductivity and so on. In the present work we reported the photo-catalytic dye degradation of green synthesized silver nanoparticles of size 43.75 nm by using the flowers extract of Rhododendron campanulatum tree. Synthesized AgNPs have worked as a strong nano-catalyst for the degradation of toxic dyes such as malachite green (MG), and acridine orange (AO). As a catalyst, synthesized AgNPs degraded the malachite green (MG) dye 47.22 % within 90 min, and acridine orange (AO) dye 66.16 % in 4 h of solar irradiation, while in the absence of nanocatalyst, MG and AO dye degraded upto 22.13 % in 90 min and 46.75 % in 4 h of photo-irradiation respe...