چكيده به لاتين
Removal of dyes from Aqueous Solutions Using core-shell nanoparticles
Abstract
Nowadays, one of the environmental problems is the presence of synthetic dyes with organic structures in wastewaters which is highly toxic and carcinogenic for humans. re searchers have always made many attempts to isolate the dyes from waste waters that among these the use of core-shell nanoparticles have been received increasing attention due to the special surface, easy Separation and economic significance. Fe3O4@NiO has shown great ability in removal of dyes from waste watersTherefore, the aim of this study was to evaluate the ability of Fe3O4@NiO in removal of anionic dye Congo red. The full characterization of Fe3O4@NiO was characterized with different techniques such XRD, FTIR, EDS،SEM and TEM. The effect of various parameters, such as the initial pH value in range of (3-11), initial dye concentration (100-500 mg/L), adsorbent dosage (0.05-15 g), contact time (2-150 min) and temperature (20-50 C°) on adsorption process was investigated. The maximum adsorbent efficiency was achieved in pH=7, initial dye concentration 100 mg/L, adsorbent dosage0.5 g/50mL, contact time 90 minutes and temperature 20 C°. The results showed that the adsorption equilibrium data correlates well with Langmuir adsorption isotherm.It was found that the adsorption of Congo red on nano-chitosan followed the pseudo-second order equation which indicates that the adsorption process is chemisorption controlled. Thermodynamic studies also indicated that the adsorption process was a spontaneous and exothermic process. In general, the results indicate that Fe3O4@NiO have can be used as a promising adsorbent for the removal of Congo red from aqueous solutions in terms of lower equilibrium time and higher adsorption capacity.
Key words: dyes, Congo red, core-shell nanoparticles, adsorption,Fe3O4@NiO
