Green synthesis of silver and iron nano composites using aqueous extract of zanthoxylum armatum seeds and their application for removal of acid black 234 dye (original) (raw)
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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.
REMOVAL OF DYES FROM SYNTHETIC WASTEWATERS USING BIOSYNTHESIZED SILVER NANO PARTICLES
The present experiment was carried out using agno3 nano particles for dye decolorization using pterocarpus santilanus leaves by bio synthesis process. The variables effecting the decolorization process are contact time, pH, concentration, dosage and temperature. The characterization studies were carried out using ftir and xrd. The dyes experimented in the present study are methyl orange (mo), phenol red (pr), safarian stain powder (ssp) and bromo cresol green (bcg). The optimum pH for pr-5, mo-4, ssp-3 and for bcg-6 were found. The positive results confirmed that pterocarpus santilanus leaves broth combined with silver dioxide solution formed silver nano particles and it is capable of removing dyes.
2023
Environmental pollution has exacerbated the availability of clean water to mankind. In this study, Azadirachta indica leaf extract was used for sustainable synthesis of Fe-Zn nanocomposites (IZNC). The instrumental techniques of Fourier transformed infrared (FTIR) spectroscopy, energy dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM) were used to determine the structural and chemical composition. The overall surface was mildly acidic in nature, as the pHPZC was observed to be 6.00. The ultrasonicated adsorption experiments were designed by central composite design (CCD). The best responses, which proposed a contaminants removal of 80.39%, were assessed using the response surface methodology (RSM). By repeating experimental runs at the expected optimum operating parameters (OOP), the method was experimentally affirmed with the %mean error and %RSD9 being 2.695% and 1.648%, respectively. The interaction of CV dye and the nanocomposite showed tremendous adsorption efficiency towards crystal violet (CV) dye, as revealed by isotherm studies. Fitting kinetics and isotherm models were affirmed by root mean square error (RMSE), χ2, and a Pearson regression coefficient. Thermodynamic studies proved spontaneity of the CV dye adsorption over the nanocomposites. The values for ΔG o , ΔH o , and ΔS o were observed to be −1.089 kJ/mol, 28.59 kJ/mol, and −3.546 kJ/mol, respectively. Recovery of CV dye was carried out in a variety of media, including NaOH, NaCl, and CH3COOH. The maximum CV recovery was achieved in an acidic media. The robustness of adsorption was affirmed by the interference of various matrix ions, including KCl, LiCl, NaCl, and MgCl2, which did not significantly affect the adsorption process. The maximum adsorption capacity was obtained at a low concentration of LiCl. The results show that a green synthesis approach for nanocomposite synthesis might be an effective and economical way to remove organic contaminants from wastewater. Moreover, it is also effective for effluent treatment plants (ETP) for waste management purposes, in which it may be coupled with chlorine as a disinfectant to purify water that can be used for domestic and irrigation purposes.
Journal of environmental chemical engineering, 2014
This paper focused on the development and application of a novel method for preparation and characterization of soil coated with plant mediated synthesized AgNPs as a novel nanoadsorbent. A cost effective and environment friendly technique was developed for green synthesis of silver nanoparticles from silver nitrate solution through the leaf extract of Azadirachta indica as reducing as well as capping agent and was then used to synthesized soil-AgNP nanocomposite. Response surface methodology (RSM) was employed to investigate the effect of different operating parameters on the uptake of crystal violet (CV) using the novel nanocomposite materials A two level three factor (2 3) factorial central composite design (CCD) was used for the optimization of the process parameters and to evaluate the effects and interactions of process variables: initial solution pH (4.0-9.0), time requirement (30-90 min), and agitation speed (80-180 rpm) were studied. Multiple response optimization was applied to the experimental data to discover the optimal conditions for a set of response, simultaneously, by using a desirability function. The optimum removal efficiency of the Ag-nanocomposite adsorbent for CV adsorption was found as 99.995%.
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.
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.