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

Abstract

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

Keywords

• Activated carbon electrode,electrosorption,aromatic organic acids,water treatment

Aromatik Organik Asitlerin Sulu Çözeltilerden Granüllü Aktiflenmiş Karbon Elektrotlar Üzerine Elektrosorpsiyonu

Abstract

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

Keywords

• Aktiflenmiş karbon elektrot,elektrosorpsiyon,aromatik organik asitler,su arıtma

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