Electrosoption of Aromatic Organic Acids From Aqueous Solutions Onto Granular Activated Carbon Electrodes for Water Purification

Waste water treatment systems have great importance as a result of the increasing population and environmental pollution. In this study, electrosorptive removal of benzoic acid (BA) and nicotinic acid (NA) from aqueous solutions onto activated carbon electrodes (ACEs) were studied. ACEs were fabricated from the industrially available granular activated carbon and polyethylene as binder. During the electrosorption process, the change in concentration of organic molecules was followed by using an online UV–Vis spectrophotometric system. Effects of operational parameters such as applied potential and volumetric flow rate on electrosorption of BA were examined. Optimum parameters for the process were found to be 60 mL.min-1 for volumetric flow rate and 1.5 V for polarization of ACEs. Electrosorption of binary mixtures of BA and NA was also studied. it can be concluded that BA and NA can be effectively removed by electrosorption from aqueous solutions using activated carbon electrodes.

Aromatik Organik Asitlerin Sulu Çözeltilerden Granüllü Aktiflenmiş Karbon Elektrotlar Üzerine Elektrosorpsiyonu

Su arıtma sistemleri, artan insan nüfusu ve çevre kirliliği sonucunda oldukça önemli hale gelmiştir. Bu çalışmada, benzoik asit (BA) ve nikotinik asitin (NA) sulu çözeltilerinden, aktiflenmiş karbon elektrotlar (ACEs) üzerine elektrosorpsiyon yolu ile uzaklaştırılmaları incelenmiştir. ACEs, endüstriyel olarak elde edilebilen granüllü aktiflenmiş karbon ve polietilen bağlayıcı kullanılarak üretilmiştir. Elektrosorpsiyon sırasında organik moleküllerin derişimlerinde oluşan değişimler, online UV–Vis spektrofotometrik sistem kullanılarak takip edilmiştir. BA nın elektrosorsiyonu üzerine uygulanan potansiyel ve çözelti akış hızı gibi sistem parametrelerinin etkileri incelenmiştir. Optimum proses parametrelerinin, çözelti akış hızı için 60 mL.dk-1 ve ACEs polarizasyonu için 1.5 V olduğu bulunmuştur. BA ve NA içeren ikili karışımların elektrosorpsiyon davranışları da incelenmiştir. BA ve NA nın aktiflenmiş karbon elektrotlar kullanılarak sulu çözeltilerinden elektrosorpsiyon ile etkili bir şekilde uzaklaştırılabileceği sonucuna varılmıştır.

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1. I. Ghodbane, L. Nouri, O. Hamdaoui, M. Chiha, Kinetic and equilibrium study for the sorption of cadmium(II) ions from aqueous phase by eucalyptus bark, Journal of Hazardous Materials, 152 (2008) 148-158.
2. R. Michalski, A. Ficek, Environmental pollution by chemical substances used in the shale gas extraction-a review, Desalination and Water Treatment, 57 (2016) 1336-1343.
3. A. Dabrowski, Adsorption - from theory to practice, Advances in Colloid and Interface Science, 93 (2001) 135-224.
4. T.H. Kim, C. Park, E.B. Shin, S. Kim, Decolorization of disperse and reactive dyes by continuous electrocoagulation process, Desalination, 150 (2002) 165-175.
5. I.M. Banat, P. Nigam, D. Singh, R. Marchant, Microbial decolorization of textile-dye-containing effluents: A review, Bioresource Technology, 58 (1996) 217-227.
6. E. Bayram, E. Ayranci, Investigation of changes in properties of activated carbon cloth upon polarization and of electrosorption of the dye basic blue-7, Carbon, 48 (2010) 1718-1730.
7. J.J. Niu, B.E. Conway, Adsorption of organics onto an high-area C-cloth electrode from organic solvents and organic solvent/water mixtures, Journal of Electroanalytical Chemistry, 546 (2003) 59-72.
8. E. Bayram, E. Ayranci, Electrochemically Enhanced Removal of Polycyclic Aromatic Basic Dyes from Dilute Aqueous Solutions by Activated Carbon Cloth Electrodes, Environmental Science & Technology, 44 (2010) 6331-6336.
9. Y. Oren, A. Soffer, Water desalting by means of electrochemical parametric pumping 1. The equilibrium properties of a batch unit-cell, Journal of Applied Electrochemistry, 13 (1983) 473-487.
10. F. Walsh, G. Mills, Electrochemical Techniques for a Cleaner Environment, Chemistry & Industry, 15 (1993) 576-580.
11. D.L. Johnsen, Z.Q. Zhang, H. Emamipour, Z.F. Yan, M.J. Rood, Effect of isobutane adsorption on the electrical resistivity of activated carbon fiber cloth with select physical and chemical properties, Carbon, 76 (2014) 435-445.
12. C.A. Nunes, M.C. Guerreiro, Estimation of Surface Area and Pore Volume of Activated Carbons by Methylene Blue and Iodine Numbers, Quimica Nova, 34 (2011) 472-U309.
13. E. Bayram, E. Ayranci, Structural effects on electrosorptive behavior of aromatic organic acids from aqueous solutions onto activated carbon cloth electrode of a flow-through electrolytic cell, Journal of Electroanalytical Chemistry, 683 (2012) 14-20.
14. E. Bayram, E. Ayranci, A systematic study on the changes in properties of an activated carbon cloth upon polarization, Electrochimica Acta, 56 (2011) 2184-2189.
15. R. Berenquer, J.P. Marco-Lozar, C. Quijada, D. CazorlaAmoros, E Morallon, Effect of electrochemical treatments on the surface chemistry of activated carbon, Carbon, 47 (2009) 1018-1027.
16. N. Schouten, L.G.J. van der Ham, G.J.W. Euverink, A.B. de Haan, Kinetic analysis of anionic surfactant adsorption from aqueous solution onto activated carbon and layered double hydroxide with the zero length column method, Separation and Purification Technology, 68 (2009) 199-207.
17. N. Tekin, M. Cebe, C. Tarimci, Polarizabilities and dipole moments of benzaldehyde, benzoic acid and oxalic acid in polar and nonpolar solvents, Chemical Physics, 300 (2004) 239-246.