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

Abstract

Ö Z E T S u 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. Anahtar KelimelerAktiflenmiş karbon elektrot, elektrosorpsiyon, aromatik organik asitler, su arıtma. A B S T R A C TW aste 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.

A critical review on the electrosorption of organic compounds in aqueous effluent – Influencing factors and engineering considerations

“…Similar trends have been observed with 2,4-dichlorophenoxyacetic acid (Fig. 8f) (Bayram et al, 2018), acilan blau dye (Koparal et al, 2002), burdem orange II (Gerçel, 2016), BA and NA (Bayram, 2016), metribuzin (Kitous et al, 2009) and BA (Bayram and Ayranci, 2012b) electrosorptions. It was assumed that the EDL thickness at the polarized adsorbent surface decreased with an increasing flow regime (Bayram et al, 2018).…”

“…It constitutes the basis to determine and predict the performance of systems during the optimization step in batch mode and for the subsequent scale-up phase. The kinetic data for electrosorption of many organic species onto carbon electrodes fit quite well with the pseudo-first-order kinetic model (Ayranci and Conway, 2001;Bayram andAyranci, 2012b, 2012a;Han et al, 2006b). Since high surface areas of the electrodes (e.g., porous carbon materials) are used most of the time in electrosorption, the kinetic rate is often limited by the electric current and not by diffusion.…”

“…Since high surface areas of the electrodes (e.g., porous carbon materials) are used most of the time in electrosorption, the kinetic rate is often limited by the electric current and not by diffusion. This could explain the good fitting with the pseudo-first order model (Ayranci and Conway, 2001;Bayram andAyranci, 2012b, 2012a;Han et al, 2006b).…”