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Mehdi Ahmadi,Farshid Ghanbari,Alberto Alvarez,Susana Silva Martinez 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.8
The performance of UVA-LEDs assisted peroxymonosulfate (PMS)/Fe2+ system was evaluated on carmoisine (E122) decolorization. Complete color removal was obtained under the conditions of pH=3.0, PMS=1.5mM, Fe2+=1mM and 25 min reaction time. UVA-LEDs were preferable compared to conventional UVA lamp in terms of decolorization. The functions of Co2+, Cu2+, Mn2+ and Fe2+ were compared and their results showed that Co2+ and Fe2+ had the highest efficiencies. Moreover, the presence of chloride ion showed a double role in different concentrations in which promotional effect was observed in 100mM Cl−<, while inhibitory effect occurred in 1-10mM Cl−. However, the high concentration of chloride had no influence on mineralization of E122. The scavenging results demonstrated that the UV irradiation increased the contribution of HO•. In addition, in the presence of chloride ion, HOCl along with sulfate and hydroxyl radicals were the major oxidative agents.
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Aleman-Gama, Elizabeth,Cornejo-Martell, Alan J.,Kamaraj, Sathish Kumar,Juarez, Katy,Silva-Martinez, Susana,Alvarez-Gallegos, Alberto The Korean Electrochemical Society 2022 Journal of electrochemical science and technology Vol.13 No.2
The high internal resistance (R<sub>int</sub>) that develops across the sediment microbial fuel cells (SMFC) limits their power production (~4/10 mW m<sup>-2</sup>) that can be recovered from an initial oil-contaminated sediment (OCS). In the anolyte, R<sub>int</sub> is related to poor biodegradation activity, quality and quantity of contaminant content in the sediment and anode material. While on the catholyte, R<sub>int</sub> depends on the properties of the catholyte, the oxygen reduction reaction (ORR), and the cathode material. In this work, the main factors limiting the power output of the SMFC have been minimized. The power output of the SMFC was increased (47 times from its initial value, ~4 mW m<sup>-2</sup>) minimizing the SMFC R<sub>int</sub> (28 times from its initial value, 5000 ohms), following the main modifications. Anolyte: the initial OCS was amended with several amounts of gasoline and kerosene. The best anaerobic microbial activity of indigenous populations was better adapted (without more culture media) to 3 g of kerosene. Catholyte: ORR was catalyzed in birnessite/carbon fabric (CF)-cathode at pH 2, 0.8M Na<sub>2</sub>SO<sub>4</sub>. At the class level, the main microbial groups (Gammaproteobacteria, Coriobacteriia, Actinobacteria, Alphaproteobacteria) with electroactive members were found at C-anode and were associated with the high-power densities obtained. Gasoline is more difficult to biodegrade than kerosene. However, in both cases, SMFC biodegradation activity and power output are increased when ORR is performed on birnessite/CF in 0.8 M Na<sub>2</sub>SO<sub>4</sub> at pH 2. The work discussed here can focus on bioremediation (in heavy OCS) or energy production in future work.
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