Membrane-free electrochemical deoxygenation of aqueous solutions using symmetric activated carbon electrodes in flow-through cells

The aim of the work was to evaluate the possibility of using commercial and modified activated carbons for the removal of oxytetracycline from aqueous solutions. The kinetics and statics of adsorption as well as the effect of the activated carbon dose and solution pH on the efficiency of the oxytetracycline adsorption were analyzed. Based on the study of oxytetracycline adsorption isotherms, the activated carbons were ranked in the following order: F-300 > WG-12 > Picabiol > ROW08 > WACC 8 × 30 > F-100 > WAZ 0.6–2.4. The most effective activated carbons were characterized by large specific surfaces. The best matching results were obtained for: Redlich–Peterson, Thot and Jovanovic models, and lower for the most frequently used Freundlich and Langmuir models. The adsorption proceeded better from solutions with pH = 6 than with pH = 3 and 10. Two ways of modifying activated carbon were also assessed. A proprietary method of activated carbon modification was proposed. It uses the heating of activated carbon as a result of current flow through its bed. Both carbons modified at 400 °C in the rotary kiln and on the proprietary SEOW (Joule-heat) modification stand enabled to obtain adsorbents with higher and comparable monolayer capacities. The advantage of the proposed modification method is low electricity consumption.

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Kinetic and isotherm studies on the electrosorption of NaCl from aqueous solutions by activated carbon electrodes

Desalination ◽

10.1016/j.desal.2010.09.033 ◽

2011 ◽

Vol 267 (2-3) ◽

pp. 239-243 ◽

Cited By ~ 111

Author(s):

Zhaolin Chen ◽

Cunyi Song ◽

Xiaowei Sun ◽

Hongfei Guo ◽

Guangdong Zhu

Keyword(s):

Activated Carbon ◽

Aqueous Solutions ◽

Carbon Electrodes

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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 ◽

10.1016/j.jelechem.2012.07.028 ◽

2012 ◽

Vol 683 ◽

pp. 14-20 ◽

Cited By ~ 6

Author(s):

Edip Bayram ◽

Erol Ayranci

Keyword(s):

Activated Carbon ◽

Organic Acids ◽

Aqueous Solutions ◽

Electrolytic Cell ◽

Carbon Cloth ◽

Structural Effects ◽

Activated Carbon Cloth ◽

Flow Through

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Flow-through electrosorption process for removal of 2,4-D pesticide from aqueous solutions onto activated carbon cloth fixed-bed electrodes

Water Science & Technology ◽

10.2166/wst.2017.598 ◽

2017 ◽

Vol 77 (3) ◽

pp. 848-854 ◽

Cited By ~ 4

Author(s):

Edip Bayram ◽

Çağdaş Kızıl ◽

Erol Ayrancı

Keyword(s):

Activated Carbon ◽

Aqueous Solutions ◽

Flow Rate ◽

Fixed Bed ◽

Volumetric Flow Rate ◽

Carbon Cloth ◽

Applied Potential ◽

Operational Parameters ◽

Activated Carbon Cloth ◽

Flow Through

Abstract Wastewater treatment systems have great importance in dealing with increasing environmental pollution. In this study, a specially designed and constructed flow-through electrochemical cell was used to enhance the electrosorptive removal capacity of 2,4-Dichlorofenoxyacetic acid (2,4-D) pesticide from aqueous solutions onto high area activated carbon cloth (ACC) fixed-bed electrodes. The change in concentration of 2,4-D during the electrosorption process was followed by an online UV–Vis spectrophotometric system. Effects of operational parameters such as volumetric flow rate, applied potential and existence of Na2SO4 salt on electrosorption of 2,4-D were examined. Optimum values were found to be 10 mL·min−1 for volumetric flow rate and +900 mV for the applied potential to polarize ACC. Maximum capacity of 729 mg·gACC−1 has been achieved for removal of 2,4-D pesticides.

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