Síntese e caracterização de óxido de grafeno funcionalizado com BPEI para remoção de cobre em meio aquoso

Abstract

Water consumption has increased considerably all over the world, due to population growth and industrial demand. This consumption is of concern since only 3⁒ of the world's water is fresh and suitable for consumption. One of the major consumers of water are industries that often generate effluents contaminated with toxic metals that need treatment so that the water used can be reused, treated or even disposed of correctly. Studies indicate that one of the best methods for this decontamination is to use the adsorption method for this, choosing a good adsorbent is essential. Graphene oxide (GO) appears as a promising material in the application of removal of toxic cations, being possible to perform modifications on its surface, improving its adsorption properties. Thus, GO was synthesized using the modified Hummers method followed by surface functionalization using polyethyleneimine polymer (BPEI). The techniques of Vibrational Transmittance Spectroscopy in the Infrared Region by Fourier Transform (FTIR), Raman Spectroscopy and X-Ray Difractometry (XRD) demonstrated that the synthesis and functionalization were successful, making it possible to manufacture filters to evaluate the adsorption capacity of the material against a 3g/L copper chloride solution. The filtrate was analyzed using Spectroscopy in the Ultraviolet-Visible Region (UV-Vis) revealing the adsorptive capacity of the filters composed of GO and GO@BPEI, however, new tests are necessary in order to improve the functionality of the generated products.