Abstract
Microbial fuel cells (MFCs) are a green and efficient approach to treat wastewater and generate energy. According to the present research, a novel MFC fabricate based on graphite rod electrodes (GRE). The surface of this cathode was modified with iron-functionalized ZSM-5 nanozeolite. The characterization of Iron doping in nanozeolite structure and electrode surface modification were obtained by XRD and EDX analyzes, respectively. Chemical analysis of square wave (Sqw) and cyclic voltammetry (CV) determined for all of three graphite electrodes (G, G-Z and G-Z/Fe) with higher efficiency. Morover, the comparison of experimental results from 72-hour fuel cell steering was evaluated and showed that the G-Z/Fe graphite electrodes has maximum efficiency and effectiveness. Thus, the efficiency of fuel cell output current and residual chemical oxygen demand removal with this electrode increased up to 21.8% and 36.9%, respectively. The effiucient recovery for the modification of the graphite electrode was achieved due to increasing of the specific surface area, the active sites of functionalized nanozeolite and the elevation in the electrical conductivity through the presence of iron particles doped in the ZSM-5/Fe nanocatalyst structure. Therefore, the G-Z/Fe cathode can be used as a favorite electrode for the construction of MFCs based on GRE .
Highlights
Microbial fuel cell (MFC) has different approach for wastewater treatment because the wastewater treatment process generates electricity or hydrogen gas instead of consuming electricity [1]
The results of this study revealed an increase in the specific surface area and the active sites for oxygen uptake, so that the maximum current output density produced was 15.16 mW m-2 and the chemical oxygen demand (COD) removal efficiency was reported between 54-71%, which was related to the presence of active reaction sites on the electrode [14]
Energy dispersive X-ray spectroscopy (EDX) analysis The curves of EDX analyzes for the surface of G-Z and G-Z/Fe electrodes compared as Figure 5a and 5b
Summary
Microbial fuel cell (MFC) has different approach for wastewater treatment because the wastewater treatment process generates electricity or hydrogen gas instead of consuming electricity [1]. The researchers were developed a triple nanocomposite cathode containing graphene oxide, polyethylene dioxythiophene and iron oxide nanorods to increase the current efficiency of MFCs. Due to the large specific surface area of the electrode, high electrical conductivity as well as large sites for oxygen uptake in this electrode, the oxidation-reduction reaction occurs very quickly; as far as the power output density of the cell could be maintained for more than 600 hours [13]. The results showed us, the specific surface area is a very effective factor in increasing the efficiency of MFCs. In this study, the graphite rod as a high stability and electrical conductivity was used for wastewater treatment. In this study the graphite rod electrodes were modified with iron particles (Fe) as a doping agent on ZSM-5 nanozeolite (G-Z/Fe/ ZSM-5) for increasing of MFC efficiency for wastewater treatment
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