Advantages of TiO 2 /carbon nanotube modified photocatalytic membranes in the purification of oil-in-water emulsions

Gábor Veréb, Viktória Kálmán, Tamás Gyulavári, Szabolcs Kertész, Sándor Beszédes, Gábor Kovács, K. Hernádi, Zsolt Pap, Cecilia Hodúr, Zsuzsanna László

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4 Citations (Scopus)

Abstract

For the effective purification of emulsified oil contaminated waters advanced treatment methods have to be applied, such as membrane filtration, which is able to eliminate macro-, and even nanoscale oil droplets, however, membrane fouling is still a major problem, which prevents economic utilization. Therefore, fouling mitigation is one of the most important aspects in the field of membrane separation developments. In the present study, solely TiO 2 and TiO 2 /carbon nanotubes (CNT) composite modified PVDF membranes were prepared and used to purify oil-in-water emulsions. Achievable fluxes, reversible and irreversible filtration resistances, fouling models, filtration efficiencies and photocatalytic activities were compared in case of different nanomaterial covered and unmodified PVDF membranes. Applying either solely TiO 2 or solely CNT coating resulted in the significant reduction of total filtration resistance in both cases, but the combination of the two components (TiO 2 with 1 wt% CNT) resulted in by far the highest flux and lowest resistance, meanwhile, the enhanced photocatalytic efficiency of the composite was also achieved. To the best of our knowledge, this study demonstrates the beneficial effects of the combination of TiO 2 and CNT nanomaterials for the first time in the field of membrane separation of oil-in-water emulsions.

Original languageEnglish
Pages (from-to)1167-1174
Number of pages8
JournalWater Science and Technology: Water Supply
Volume19
Issue number4
DOIs
Publication statusPublished - Jun 1 2019

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Keywords

  • Carbon nanotube
  • Composite
  • Enhanced flux
  • Membrane
  • Oil-in-water emulsion
  • Titanium dioxide

ASJC Scopus subject areas

  • Water Science and Technology

Cite this

Veréb, G., Kálmán, V., Gyulavári, T., Kertész, S., Beszédes, S., Kovács, G., Hernádi, K., Pap, Z., Hodúr, C., & László, Z. (2019). Advantages of TiO 2 /carbon nanotube modified photocatalytic membranes in the purification of oil-in-water emulsions Water Science and Technology: Water Supply, 19(4), 1167-1174. https://doi.org/10.2166/ws.2018.172