Fabrication Of Nitro-organic Compounds Modified Graphene Oxide-based Materials For The Adsorption Of Rhenium

In this study,graphene oxide preparing by natural graphite was used as raw materials to prerare two types graphene oxide-based adsorbents containg nitro-organic compounds via amination modification.Adsorption behaviors of the adsorbents towards rhenium were systematically investigated in aqueous phase.The experimental results were as follows:First of all,we synthesized diisobutylamine-functionalized graphene oxide as adsorbent(GO-DEA-DIBA)by adjusting synthetic conditions to prevent the loss of oxygen in the synthetic process of functional graphene oxide.SEM?FTIR?EDX?BET and XRD could prove that diisobutylamine successfully grafted on the 2D layer structure of the graphene oxide.The GO-DEA-DIBA has the maximum uptake of Re(VII)about 140.82 mg·g-1 at pH=2,and the adsorption behavior obeys the Langmuir model.And,Re(VII)was adsorbed on the GO-DEA-DIBA via charge interactions between tertiary amine groups and ReO4-.By studying the regeneration and application performance of GO-DEA-DIBA,indicated GO-DEA-DIBA not only has brilliant cycle performance,but also can separate Re(VII)from ReO4-,Cu2+,Zn2+,Mn2+,quaternary mixtures.Secondly,we obtained four types ionic liquids by making 1-methylimidazole,trimethylamine,trioctylamine,N235 reacting with epichlorohydrin,and grafted them onto graphene oxide(GO),which named GO-EDA-IM,GO-EDA-TEA,GO-EDA-TOA,GO-EDA-N235.SEM?FTIR?EDX?BET and XRD could prove that imidazolium-based ionic liquid successfully grafted on the 2D layer structure of the graphene oxide.And,this method resolved the loss of ILs to aqueous phase and the higher viscosity.The GO-EDA-IM has maximum adsorption ability on Re(VII)at various acidity due its conjugative effect and high nitrogen content.The experiments showed that the saturated adsorption capacity of GO-EDA-IM for rhenium is 210.87 mg·g-1 at pH=2,and the adsorption behavior obeys the Langmuir model.And,XPS tests and FTIR results deduced that the ReO4-uptake was a typical ion exchange between Cl– and ReO4-and charge interactions.At pH=1-3.5,the GO-EDA-IM can effectively separate Re(VII)from Cu2+,Zn2+,Mn2+.By studying the application performance and six times cycles of GO-EDA-IM,indicated GO-EDA-IM possessed brilliant selectivity and cycling performance.