Photodegradation of gaseous acetaldehyde and methylene blue in aqueous solution with titanium dioxide-loaded activated carbon fiber polymer materials and aquatic plant ecotoxicity tests
2014
Kadirova, Zukhra C. | Hojamberdiev, Mirabbos | Katsumata, Ken-ichi | Isobe, Toshihiro | Matsushita, Nobuhiro | Nakajima, Akira | Okada, Kiyoshi
TiO₂-supported activated carbon felts (TiO₂–ACFTs) were prepared by dip coating of felts composed of activated carbon fibers (ACFs) with either polyester fibers (PS-A20) and/or a polyethylene pulp (PE-W15) in a TiO₂aqueous suspension followed by calcination at 250 °C for 1 h. The as-prepared TiO₂–ACFTs with 29–35 wt.% TiO₂were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and N₂adsorption. The TiO₂–ACFT(PS-A20) samples with 0 and 29 wt.% TiO₂were microporous with specific surface areas (SBET) of 996 and 738 m²/g, respectively, whereas the TiO₂–ACFT(PE-W15) samples with 0 and 35 wt.% TiO₂were mesoporous with SBETof 826 and 586 m²/g, respectively. Adsorption and photocatalytic activity of the as-prepared samples were evaluated by measuring adsorption in the dark and photodegradation of gaseous acetaldehyde (AcH) and methylene blue (MB) in aqueous solution under UV light. The TiO₂loading caused a considerable decrease in the SBETand MB adsorption capacity along with an increase in MB photodegradation and AcH mineralization. Lemna minor was chosen as a representative aquatic plant for ecotoxicity tests measuring detoxification of water obtained from the MB photodegradation reaction with the TiO₂–ACFT samples under UV light.
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