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Removal of Trace As(V) from Water with the Titanium Dioxide/ACF Composite Electrode

Peng, Liang, Chen, Yaping, Dong, Hong, Zeng, Qingru, Song, Huijuan, Chai, Liyuan, Gu, Ji-dong
Water, air, and soil pollution 2015 v.226 no.7 pp. 203
Fourier transform infrared spectroscopy, X-ray diffraction, aqueous solutions, arsenic, carbon, drinking water, electrodes, iron oxides, manganese oxides, temperature, titanium, titanium dioxide, transmission electron microscopy
The novel titanium oxide/active carbon fiber (TiO₂/ACF) electrode was prepared, and electrosorptive properties for As(V) in aqueous solution were investigated. The structure of TiO₂/ACF was characterized with transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Furthermore, the As(V) electrosorptive properties of TiO₂/ACF electrodes with calcination temperature, ionic species, and loaded amount of TiO₂ were measured, and the electrosorption isotherm and kinetics were investigated at the applied voltage of 1.5 V. The optimal load quality of TiO₂ was 0.80 g per ACF electrode (length × width × height = 2 cm × 1 cm × 0.4 cm, 0.30 g), and optimum calcination temperature was 450 °C. The maximum electrosorption capacity of TiO₂/ACF was 8.09 mg/g, about 200 % higher than that of ACF. Moreover, the electrode performance was stable than other materials such as pure ACF, manganese oxide/ACF, and iron oxides/ACF. It can process 100 ppb As(V) of water to 6 ppb (reach the drinking water standards of WHO), demonstrating that our novel electrode is with potential practical application.