Graphene Composites And Adsorption Purification Behavior Research

Chromium?VI? is highly toxic, bioaccumulative, biodegradable, stable chemical properties and biological carcinogens could easily lead to mutations and other characteristics of the human health and ecological security, showing a serious threat.The feature of highly porous 3D structure reduction of graphene oxide hydrogel?RGH?had been retained after chemical reduction, the maximum adsorption capacity of RGH for Cr?VI? obtained from a Langmuir isotherm was 139.6 mg g^-1.The thermodynamic studies indicated that the adsorption reaction was a spontaneous and endothermic process. Furthermore, the presence of calcium ions can promote adsorption,and acidic p H and high temperature conditions have contributed to the removal of Cr?VI?ions, while RGH reused five times still has a high adsorption performance. Moreover, we have measured the performance of RGH in removing Cr?VI? under dynamic condition,the adsorption of RGH in removing Cr?VI? with different initial solution concentration and different flow rate are found to be high.This study uses a simple one-step method to prepare the three-dimensional structure and a large specific surface area of Ti O₂-graphene composite hydrogel?Ti O₂-r GH? and measures the absorption-photocatalysis synergistic effect of Ti O₂-r GH in Cr?VI?purification. The removal rate of relatively low Cr?VI? concentration can reach at 99.5%with the absorption-photocatalysis synergistic effect on Ti O₂-r GH. Meanwhile, the adsorption-photocatalysis synergistic efficiency only displays slight decrease without significant loss of activities after the reaction is performed consecutively five times and the removal rate of Cr?VI? can still be maintained at about 90%, showing high activity and good stability. Moreover, we have measured the performance of Ti O₂-r GH in removing Cr?VI? under dynamic condition, the adsorption-photocatalytic synergies efficiency of Ti O₂-r GH in removing Cr?VI? is found to be 99%^-100%, resolving most adsorbent material in the actual existence of dynamic applications with easy loss, difficult to separate issues.