Abstract
This study examined the electrocatalytic activity of multi-walled carbon nanotube (CNT) filters for remediation of aqueous phenol in a sodium sulfate electrolyte. CNT filters were loaded with antimony-doped tin oxide (Sb-SnO2; SS) and bismuth- and antimony-codoped tin oxide (Bi-Sb-SnO2; BSS) via electrosorption at 2 V for 1 h and then assembled into a flow-through batch reactor as anode–cathode couples with perforated titanium foils. The as-synthesized pristine CNT filters were composed of 50–60-nm-thick tubular carbons with smooth surfaces, whereas the tubes composing the SS-CNT and BSS-CNT filters were slightly thicker and bumpy, because they were coated with SS and BSS particles ~50 nm in size. Electrochemical characterization of the samples indicated a positive shift in the onset potential and a decrease in the current magnitude in the modified CNT filters due to passivation and oxidation inhibition of the bare CNT filters. These filters exhibited a similar adsorption capacity for phenol (5–8%), whereas loadings of SS and BSS enhanced the degradation rate of phenol by ~1.5 and 2.1 times, respectively. In particular, the total organic carbon removal performance and mineralization efficiency of the BSS-CNT filters were approximately twice those of the bare CNT filters. The BSS-CNT filters also exhibited an enhanced oxidation of ferrocyanide [FeII(CN)64−], which was not adsorbed onto the CNT filters. The enhanced electrocatalytic performance of the modified CNT filters was attributed to an effective generation of OH radicals. The surfaces of the filters were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy.
Similar content being viewed by others
References
Ahn YY, Yang SY, Choi C, Choi W, Kim S, Park H (2017) Electrocatalytic activities of Sb-SnO2 and Bi-TiO2 anodes for water treatment: effects of electrocatalyst composition and electrolyte. Catal Today 282:57–64
Ajmani GS, Goodwin D, Marsh K, Fairbrother DH, Schwab KJ, Jacangelo JG, Huang H (2012) Modification of low pressure membranes with carbon nanotube layers for fouling control. Water Res 46:5645–5654
Baek Y, Kim C, Seo DK, Kim T, Lee JS, Kim YH, Ahn KH, Bae SS, Lee SC, Lim J, Lee K, Yoon J (2014) High performance and antifouling vertically aligned carbon nanotube membrane for water purification. J Membr Sci 460:171–177
Balasubramanian K, Burghard M (2005) Chemically functionalized carbon nanotubes. Small 1:180–192
de Lannoy C-F, Jassby D, Gloe K, Gordon AD, Wiesner MR (2013) Aquatic biofouling prevention by electrically charged nanocomposite polymer thin film membranes. Environ. Sci. Technol. 47:2760–2768
Deng S, Zhang Q, Nie Y, Wei H, Wang B, Huang J, Yu G, Xing B (2012) Sorption mechanisms of perfluorinated compounds on carbon nanotubes. Environ Pollut 168:138–144
Gao G, Vecitis CD (2011) Electrochemical carbon nanotube filter oxidative performance as a function of surface chemistry. Environ. Sci. Technol. 45:9726–9734
Hu F, Cui X, Chen W (2010) Pulse electro-codeposition of Ti/SnO2-Sb2O4-CNT electrode for phenol oxidation. Electrochem Solid State Lett 13:F20–F23
Jame SA, Zhou Z (2016) Electrochemical carbon nanotube filters for water and wastewater treatment. Nanotech Rev 5:41–50
Kim YK, Park H (2011) Light-harvesting multi-walled carbon nanotubes and CdS hybrids: application to photocatalytic hydrogen production from water. Energy Environ Sci 4:685–694
Kim YK, Park H (2012) How and to what extent do carbon materials catalyze solar hydrogen production from water? Appl. Catal. B-Environ. 125:530–537
Kim S, Choi SK, Yoon BY, Lim SK, Park H (2010) Effects of electrolyte on the electrocatalytic activities of RuO2/Ti and Sb-SnO2/Ti anodes for water treatment. Appl. Catal. B-Environ. 97:135–141
Kim J, Choi WJK, Choi J, Hoffmann MR, Park H (2013) Electrolysis of urea and urine for solar hydrogen. Catal Today 199:2–7
Liu H, Vajpayee A, Vecitis CD (2013a) Bismuth-doped tin oxide-coated carbon nanotube network: improved anode stability and efficiency for flow-through organic electrooxidation. ACS Appl Mater Interfaces 5:10054–10066
Liu X, Wang M, Zhang S, Pan B (2013b) Application potential of carbon nanotubes in water treatment: a review. J Environ Sci 25:1263–1280
Liu YB, Lee JHD, Xia Q, Ma Y, Yu Y, Yung LYL, Xie JP, Ong CN, Vecitis CD, Zhou Z (2014) A graphene-based electrochemical filter for water purification. J Mater Chem A 2:16554–16562
Liu Y, Liu H, Zhou Z, Wang T, Ong CN, Vecitis CD (2015) Degradation of the common aqueous antibiotic tetracycline using a carbon nanotube electrochemical filter. Environ. Sci. Technol. 49:7974–7980
Maas M (2016) Carbon nanomaterials as antibacterial colloids. Materials 9:617
Pan B, Xing B (2008) Adsorption mechanisms of organic chemicals on carbon nanotubes. Environ. Sci. Technol. 42:9005–9013
Park H, Bak A, Ahn YY, Choi J, Hoffmannn MR (2012) Photoelectrochemical performance of multi-layered BiOx-TiO2/Ti electrodes for degradation of phenol and production of molecular hydrogen in water. J Hazard Mater 211:47–54
Schnoor MH, Vecitis CD (2013) Quantitative examination of aqueous ferrocyanide oxidation in a carbon nanotube electrochemical filter: effects of flow rate, ionic strength, and cathode material. J Phys Chem C 117:2855–2867
Vecitis CD, Gao G, Liu H (2011a) Electrochemical carbon nanotube filter for adsorption, desorption, and oxidation of aqueous dyes and anions. J Phys Chem C 115:3621–3629
Vecitis CD, Schnoor MH, Rahaman MS, Schiffman JD, Elimelech M (2011b) Electrochemical multiwalled carbon nanotube filter for viral and bacterial removal and inactivation. Environ. Sci. Technol. 45:3672–3679
Yang SY, Choo YS, Kim S, Lim SK, Lee J, Park H (2012) Boosting the electrocatalytic activities of SnO2 electrodes for remediation of aqueous pollutants by doping with various metals. Appl Catal B-Environ 111:317–325
Yang SY, Kim D, Park H (2014) Shift of the reactive species in the Sb-SnO2-electrocatalyzed inactivation of E-coli and degradation of phenol: effects of nickel doping and electrolytes. Environ Sci Technol 48:2877–2884
Yang SY, Choi W, Park H (2015) TiO2 nanotube array photoelectrocatalyst and Ni-Sb-SnO2 electrocatalyst bifacial electrodes: a new type of bifunctional hybrid platform for water treatment. ACS Appl Mater Interfaces 7:1907–1914
Acknowledgements
This research was supported by the Global Research Network Program (2014S1A2A2027802), the Basic Science Research Program (2016R1A2B4007366), and the Nano Material Technology Development Program (2016M3A7B4908169) through the National Research Foundation, Korea.
Author information
Authors and Affiliations
Corresponding author
Additional information
Responsible editor: Bingcai Pan
Electronic Supplementary Materials
ESM 1
(DOCX 790 kb)
Rights and permissions
About this article
Cite this article
Yang, S.Y., Vecitis, C.D. & Park, H. Electrocatalytic water treatment using carbon nanotube filters modified with metal oxides. Environ Sci Pollut Res 26, 1036–1043 (2019). https://doi.org/10.1007/s11356-017-8495-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11356-017-8495-6