چكيده به لاتين
This report describes the results of a study on the synthesis of a novel adsorbent material composed of chitosan, polyethyleneimine, polyvinyl alcohol and pyromellitic dianhydride (CEVP). The main goal of this four-component adsorbent preparation was efficient adsorption of methylene blue (MB) dye from aqueous solutions. The resultant nanocomposite was characterized using Field emission scanning electron microscopy (FE-SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Energy-dispersive X-ray spectroscopy (EDX), Brunauer–Emmett–Teller (BET), Differential scanning calorimetry (DSC), Thermogravimetric analysis (TGA) and UV-Visible spectrophotometer. The results from BET approximately showed that fabricated nanocomposite have surface area of 25.43 m2/g and therefore can be act as an effective adsorbent. The adsorption property of contaminant onto CEVP adsorbent was studied as a function of solution pH and contact time, amount of adsorbent and initial concentration. The obtained qmax of the nanocomposite is equal to 1021.47 mg/g which is an extraordinary value for an adsorbent. The maximum adsorption was observed for initial methylene blue (MB) concentration of 30 mg/L at pH=7, 60 min as contact time and 0.003 g/L of adsorbent dose. It should be highlighted here that the adsorption activity was examined at mild condition ((T = 25ºC and pH = 7.0) with different concentrations and times and the results showed that the nanocomposite were promising adsorbents in the adsorption process of MB from aqueous solutions. Moreover, in this procedure, the nanocomposite could successfully retain methylene blue (MB) after four cycles
