283 publications from this institution
In this paper, copper oxide nanoparticle was synthesized, and its surface was modified using N-(2aminoethyl)-3-(trimethoxysilyl)propylamine.The bi-amino surface functionalized nanoparticle (BASFN) was used to remove anionic dyes from single and binary systems.The scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, energy-dispersive X-ray spectroscopy (EDAX) and X-ray diffraction were used to characterize the nanoparticle.Direct Red 80 (DR80) and Direct Green 6 (DG6) were used as anionic dyes.The effect of adsorbent dosage, dye concentration and pH on dye removal was evaluated.Kinetic of dye adsorption on BASFN followed pseudo-second order.The results showed that the experimental data were correlated reasonably well by Langmuir and Freundlich isotherm in single and binary system, respectively.The maximum dye adsorption capacity (Q 0 ) of BASFN was 217 and 250 mg/g for DR80 and DG6, respectively.
Excessive discharge of synthetic azo dyes into the aquatic ecosystem is a global concern. Here, we develop a green approach to remediate dye pollutants by fabricating an easily separable bio-nanocomposite, based on nanofibrils from whey protein concentrate together with montmorillonite. The nanocomposite was characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction and surface area analysis. Nanofibrils lead to a uniform dispersion of montmorillonite in the matrix and also reinforce the nanocomposite. The adsorption efficacy was monitored using cationic (Chrysoidine-G, Bismarck brown-R), reactive (reactive black-5, reactive orange-16), acidic (acid red-88, acid red-114) and direct (direct violet-51, Congo red) dyes. The nanocomposite adsorbed different dyes with different kinetics, cationic dyes quicker and reactive dyes slower. Greater than 93% of Chrysoidine-G was adsorbed over a wide range of dye concentration and pH. Acidic pH and higher temperature are more favorable for the process. Equilibrium adsorption data were reasonably fitted with a linear (Nernst) isotherm model indicating the existence of an unlimited number of adsorption sites which is consistent with the high experimental uptake of 731 mg/g. Kinetic data were well-described by pseudo-second-order and intra-particle diffusion models. We conclude that this environmentally friendly nanocomposite has good potential for use in wastewater treatment and related purposes.
