An Approach in EME: Development of Thermal and Electrical Conductivities of Membrane and Disable the Chemical Carrier in Transport Process

Abstract

In this study, amine functional reduced graphene oxide (rGO-fNH2) and modified membrane was synthesized in an attempt to provide a thermal and mechanical contribution to their present performances by achieving more productive and stable membranes with the improvement of the membrane systems. So, the transport of the metal cation Cr(VI) was realized. The productivity of the membrane was increased by the transport process being realized without using a carrier on the membrane phase by modifying the membrane with rGO-fNH2. Thus, it was proved that a more productive division can be applied on a wider temperature range.When the conductivity values of the membrane were measured between 265-330 K and compared by adding different rGO-fNH2values (18.52-15.38-12.00%-8.33% w/w) to the membrane, it was seen that the conductivity values of all except for the one with the lowest compound was extremely high between these temperature ranges. Another point is that the membrane prepared as 8.33% w/w had a semi conductive feature. By applying electrical current to the membranes with polymer content (PIM) which are examples of liquid applications, the process transport time duration known as electromembrane extraction (EME) was reduced to minutes from hours. The optimized membrane includes 51.85% 2-nitrophenyl octyl ether (2-NPOE), 29.63% cellulose triacetate (CTA), 18.52% rGO-fNH2. Besides, in the experiment in which the membrane compound was 18.52 w/w; 0.5 A and 60 V was applied and within 90 min 97.41% Cr(VI) was removed from the donor phase. For a more stable process, we performed experiments with constant current instead of constant voltage. The fact that the membrane stability was over 90% even after 30 repetitions obviously showed the positive effect of the rGO-fNH2 added to the membrane. © 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.