Gum katira-silver nanoparticle-based bionanocomposite for the removal of methyl red dye (original) (raw)
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In this paper, we report use of guar gum-g-poly (methyl methacrylate) superabsorbent nanocomposite for the removal of crystal violet dye. The adsorption experiments were carried out using batch technique at different pH values. UV-Visible spectrophotometry was used for determination of dye concentration. Result indicates that prepared composite showed highest percentage removal of 78% at pH value of 8. The effect of various variables such as adsorbent dose, initial crystal violet dye concentration, time of contact and pH on percentage removal of dye was investigated. The adsorption isotherms were studied to evaluate adsorption characteristics of nanocomposite used. The study of adsorption isotherm shows that adsorption process of crystal violet follow both Freundlich and Langmuir isotherm. The kinetics of adsorption was also studied and result shows that it follows pseudo second order reaction kinetics.
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In this work, removal of methylene blue cationic dye was carried out from an aqueous solution using guar gum-g-poly (methyl methacrylate) superabsorbent nanocomposite. The batch experiments were carried out for adsorption of methylene blue at different pH values. The concentration of dye before and after adsorption was analyzed by UV-Vis Spectrophotometry. Effect of various parameters like pH, contact time, initial dye concentration and adsorbent dose on percentage removal of methylene blue was investigated.
CERN European Organization for Nuclear Research - Zenodo, 2012
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Polymer Composites, 2014
Organophilic montmorillonite (OMMT) was synthesized by cationic exchange reaction of Na 1 -MMT and vinyl benzyl triethyl ammonium chloride (VBTAC) as a reactive organic modifier in an aqueous solution. A series of styrene (St)/acrylic acid (AA)/OMMT nanocomposite hydrogel containing different wt % of OMMT was synthesized through in situ polymerization using g-ray. The samples were characterized using Fourier transform infrared (FTIR), X-ray powder diffraction (XRD), and transmission electron microscope (TEM), whereas thermal stability was examined by thermogravimetric analysis (TGA). The adsorption capacity and rate for both Acid Green B (anionic) and Maxilon C.I. Basic (cationic) dye including adsorption kinetics and isotherm were investigated at 30 C. TEM measurements showed spherical nanosized particles of average diameter 30-40 nm and XRD suggested the formation of exfoliated nanocomposite. TGA measurements showed that the addition of OMMT did not enhance the thermal stability where the onset temperature of the degradation for all samples was around 125 C. The effect of some important parameters on dye adsorption such as solution pH, initial dye concentration, and contact time was investigated. The equilibrium data obtained in batch experiments were correlated to Langmuir and Freundlich isotherm equations. Results showed that the adsorption of Acid Green B fitted well to the Langmuir model while the adsorption pattern of Maxilon C.I. Basic followed the Freundlich isotherm, which suggests heterogeneity of the adsorption sites on the nanocomposite. POLYM. COMPOS., 00:000-000, 2014.
Green synthesis of clay/silver nanocomposite materials for adsorption of hazardous dyestuffs
DESALINATION AND WATER TREATMENT, 2017
In this study, clay/silver nanocomposite material (clay/AgNCs) was biosynthesized using Acacia cyanophylla extract, and the synthesized clay/AgNCs material was used as an adsorbent for adsorption of the Methylene Blue (MB) and Telon Blue AGLF (TB) dyes, known as hazardous dyestuffs. The optimum initial pH, temperature, and adsorbent concentration were determined to be 8.0, 45°C, and 1.0 g/L for MB adsorption and 8.0, 55°C, and 1.0 g/L for TB adsorption, respectively. The experimental equilibrium data for MB and TB adsorption were fitted well to the Freundlich and Langmuir isotherm models, respectively. The studied adsorption process followed the pseudo second order kinetic model. Weber-Morris model results showed that both intraparticle and film diffusion were effective on the studied adsorption systems. The thermodynamic parameters showed that MB and TB adsorption on clay/AgNCs were endothermic, increasing in randomness of adsorbed species and spontaneous for MB adsorption, induced for TB adsorption. Moreover, clay/AgNCs were characterized by DLS, FT-IR, XRD, SEM and EDX analysis methods.
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.
Journal of Industrial and Engineering Chemistry, 2015
In the present work, adsorption of basic red 46 (BR46) by nano-sized montmorillonite (MMT)/calcium alginate (CA) composite was optimized using central composite design. The maximum dye removal of 85.07% was obtained at an initial dye concentration of 30 mg L À1 , adsorbent dosage of 2 g L À1 , contact time of 60 min and temperature of 25 8C. The adsorption capacity decreased with decreasing both initial pH and mixing speed. The pseudo-second order kinetic model had the highest correlation coefficient (R 2 = 1.00). Based on the Langmuir isotherm model, the maximum adsorption capacity of MMT/CA was about 35 mg g À1 .