Balasubramani Kavitha; Sharumathi Selvam; Sivakumar Subburam
Abstract
The purpose of this study was to determine the adsorptive characteristics of a MnWO4/ZnS nanocomposite for removing Amaranth dye from aqueous solution. A simple chemical precipitation approach was used to make the MnWO4/ZnS nanocomposite. The crystal structure, morphology, and pore size of the resulting ...
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The purpose of this study was to determine the adsorptive characteristics of a MnWO4/ZnS nanocomposite for removing Amaranth dye from aqueous solution. A simple chemical precipitation approach was used to make the MnWO4/ZnS nanocomposite. The crystal structure, morphology, and pore size of the resulting nanocomposites were evaluated by UV-vis-DRS, FT-IR, XRD, SEM, EDAX and BET. In a laboratory batch adsorption experiment, the effect of operational parameters such as adsorbent dose, starting dye concentration, agitation speed, contact time, and temperature was investigated to optimise the conditions for maximum amaranth removal. To reduce the number of trials and the associated costs, an artificial neural network (ANN) was used to forecast dye removal effectiveness. For amaranth dye, a contact time of 180 minutes, an adsorbent dosage of 0.35 g/l, and an initial dye concentration of 10 M resulted in a 96 percent dye removal. Different models were used to fit the equilibrium isotherm data. Langmuir and Temkin models have high R2 and are in good agreement with the experimental data (0.9966 and 0.9927). T and film diffusion may be involved in the sorption process, according to the kinetic analysis. When the experimental data was compared to the dye adsorption efficiency predicted by the artificial neural network model, it was discovered that this model can accurately predict the behaviour of the amaranth dye adsorption process on MnWO4/ZnS under various conditions.
Sheik Mohideen Badhusha M; Kavitha Balasubramani; Rajarajan M; Tharmaraj P; Suganthi Ayyadurai
Abstract
ZnO, single-doped (Co-ZnO, Cu-ZnO), and co-doped ZnO ((Co, Cu)/ZnO) were effectively synthesized by the citrate gel combustion technique. The samples were characterized by UV-visible diffuse reflectance spectroscopy (UV-vis-DRS), Fourier transforms infrared spectroscopy (FT-IR), X-ray powder diffraction ...
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ZnO, single-doped (Co-ZnO, Cu-ZnO), and co-doped ZnO ((Co, Cu)/ZnO) were effectively synthesized by the citrate gel combustion technique. The samples were characterized by UV-visible diffuse reflectance spectroscopy (UV-vis-DRS), Fourier transforms infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and photoluminescence spectroscopy (PL). The average particle size was 30.33 nm as calculated from XRD patterns for (Co, Cu)/ZnO. UV-Vis absorption spectrum indicates that the co-doped ZnO exhibits increased visible light absorption compared to the undoped one. The photoluminescence spectroscopy shows that the separation efficiency of photo-induced electrons and hole is enhanced by the co-doping strategy. (Co, Cu)/ZnO nanoparticles demonstrated a strong visible light response and high photocatalytic activity for Rhodamine B (RhB) degradation under irradiation by visible light (400-500 nm). The visible-light photocatalytic activity of the prepared (Co, Cu)/ZnO may come about because of the incorporation of Co, Cu atoms in ZnO, photo-induced electron-hole pairs and extended the spectral response to the visible region. The antibacterial and antifungal activities of ZnO, Co-ZnO, Cu-ZnO, and (Co, Cu)/ZnO were studied respectively with Staphylococcus aureus (Gram-positive), Escherichia coli (Gram-negative) ( bacterial strain) and Aspergillus flavus, Candida albicans (fungal strain). The (Co, Cu)/ZnO enhanced the antimicrobial activity.