Various Metal Oxide Additions Based on TiO2 and Adsorption Characteristics of Hollow Fiber Adsorbent on Arsenic

In this study, the hollow fibers from TiO2 and various metal oxides additives were fabricated and characterized in order to remove the arsenic substance from a contaminated water. Experimental results showed the best arsenic adsorption performance from pristine TiO2 hollow fibers. When metal oxides were added, the metal oxides reduced the acid sites on the surface of TiO2 and the arsenic adsorption performance decreased. However, the long term arsenic adsorption performance was enhanced and showed better performance than that of using pristine TiO2 hollow fibers when Al2O3 was added during the hollow fiber fabrication. In addition, the arsenic adsorption performance showed a high dependency on the specific surface area of hollow fibers. It was confirmed that the abundancy of Lewis and Bronsted acid sites provided was favorable for the arsenic adsorption. It was also demonstrated that commercially available TiO2 powders can be an attractive candidate material for manufacturing hollow fibers for a small scale water treatment plant.