Abstract
In this paper, graphene oxide–bismuth tungstate (GO–Bi2WO6) nanocomposite was synthesized and used as an efficient and green adsorbent for the removal of Pb2+. Bi2WO6 nanoplates were synthesized by the co-precipitation method and then used for modifying of graphene oxide. To characterize of the synthesized adsorbent, Fourier-transform infrared spectrophotometry (FT-IR), field emission scanning electron microscopy (FESEM), electron-dispersive X-ray spectroscopy (EDX) and X-ray diffraction spectroscopy (XRD) were used. By optimization of critical parameters including pH of sample solution, amounts of adsorbent and contact time, it was revealed that pH = 5.0, 20 mg adsorbent and 20 min contact time provide above 94% removal percentage for 50 mg L−1 Pb2+. Different adsorption isotherms including Langmuir, Freundlich, Temkin and Dubinin–Radushkevich were investigated, and the results show that the adsorption of Pb2+ followed by the Freundlich isotherm with a maximum adsorption capacity of 128 mg g−1. Also, interpretation of different kinetic models shows that adsorption of Pb2+ is followed by the pseudo-second-order kinetic model. Finally, the results of thermodynamic analysis show that adsorption of Pb2+ onto the GO–Bi2WO6 nanocomposite is endothermic and spontaneous process (ΔH ˃ 0, ΔG < 0) and desirable at higher temperatures.
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Authors wish to thank the University of Neyshabur for its financial support (Grant Number: 25783).
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Saadati, T., Eftekhari, M., Rezazadeh, N. et al. Graphene oxide–bismuth tungstate (GO–Bi2WO6) nanocomposite as a green adsorbent for lead removal: isotherm, kinetics and thermodynamic study. Int. J. Environ. Sci. Technol. 20, 1301–1314 (2023). https://doi.org/10.1007/s13762-022-04627-5
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DOI: https://doi.org/10.1007/s13762-022-04627-5