▎ 摘　　要

In this study, graphene oxide (GO) was prepared from graphite powder by modified Hummers' method. Characterization of prepared GO was carried out by FTIR, Raman spectroscopy, SEM, AFM, XRD and elemental analysis. To observe its adsorption capacity, it was applied for adsorption of a synthetic anionic dye, TURQUOISE GN (TGN) used in textile industries. The influence of pH, dosage of adsorbent, time, concentration of the dye on adsorption capacity of GO were studied. The experimental results showed that GO can be used as a promising adsorbent for dye removal from textile effluents. The distribution of TGN on GO was determined by applying Langmuir as well as Freundlich isotherm models and the results match preferably with Langmuir model. The theoretical maximum sorption capacities were determined from Langmuir isotherm which were 565.61 and 294.12 mg/g at pH of 2 and 7, respectively. To find out the mechanism of TGN adsorption on GO, pseudo-first-order as well as pseudo-second order models were applied and the results matched well with second-order model. From thermodynamic effect, it was found that the adsorption process is more spontaneous at lower temperature and it is a physisorption process. The regeneration of the used GO was studied and found that regenerated GO showed about 40% adsorption efficiency with respect to fresh GO up to 4th recycle for the removal of TGN from aqueous solution.