Ion exchange membrane-assisted electro-activation of aqueous solutions: Effect of the operating parameters on solutions properties and system electric resistance |
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| Institution: | 1. Institute of Nutrition and Functional Foods (INAF), Université Laval, Quebec, QC G1V 0A6, Canada;2. Department of Food Sciences and Nutrition, Université Laval, Quebec, QC G1V 0A6, Canada;3. Natural Resources Canada/CanmetENERGY, 1615 Lionel-Boulet Blvd., P.O. Box 4800, Varennes, QC J3X 1S6, Canada;4. Department of Soil Sciences and Agri-Food Engineering, Université Laval, Quebec, QC G1V 0A6, Canada;1. Department of Electronic Engineering, Industrial Chemistry and, University of Messina, Viale F.S. D’Alcontres 31, 98166, Messina, Italy;2. Department of Mathematics and Computer Science, University of Messina, Viale F.S. D’Alcontres 31, 98166 Messina, Italy;3. Department of Industrial Engineering, University of Padova, via F. Marzolo, 35131 Padova, Italy;1. Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK;2. Centre for Environmental Strategy, The University of Surrey, Guildford, Surrey GU2 7XH, UK;3. DIMA, Sapienza Università di Roma, via Eudossiana 8, 00184 Roma, Italy;1. Center for Process Design, Safety and Loss Prevention (CPSL), Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran, Iran;2. Centre for Economics and Corporate Sustainability, KULeuven, Campus Brussels, 1000 Brussels, Belgium;3. Safety and Security Science Group, Faculty TBM, TU Delft, Jaffalaan 5, 2628 BX Delft, The Netherlands |
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| Abstract: | The properties of electro-activated (EA) aqueous solutions as well as the dynamics of their changes were considered in the current study using aqueous solutions of NaCl and NaHCO3. The concentrations of the salt solutions were 0.5, 0.25, 0.125 and 0.05 M. The tests were performed at the DC current densities of 25, 37.5, and 50 Å/m2. The electro-activation reactor consisted of three individual cells assembled together and separated by anion-exchange (AEM) and cation-exchange (CEM) membranes. During the experiments, four configurations of the membrane placements and solutions concentrations were studied. The obtained results showed the dynamics of the electro-activation process that allows obtaining electro-activated solutions with targeted properties such as pH and oxydo-reduction potential (ORP). It was possible to obtain electro-activated solutions at the anodic side (acid anolyte) with pH of 3.0, 3.5, and 4.0 and ORP of +1100 ± 15 mV when NaCl solution was used as electrolyte. Furthermore, several types of electro-activated solutions with high redox potential (ORP = +921 ± 12 mV) and neutral pH (6.48 ± 0.05) were obtained on the anode side when sodium carbonate was used. At the same time, two types of solutions, one with acid pH (2.14 ± 0.14) and the other one with alkaline pH (10.46 ± 0.03) with ORP = +689 ± 10 and 110 ± 21 mV, respectively, were obtained in the central compartment which considered as electro-activated solutions obtained by means of noncontact electro-activation. |
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| Keywords: | Electro-activation Aqueous solutions Ion exchange membranes Reactor Electrolysis |
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