| 摘要 |
A titanium-dioxide photocatalyst that excels in both photocatalytic activity and solid-liquid separation performance is applied to water treatment to provide a method for treating an arsenic-containing aqueous solution. This method is provided with the following steps: a step in which catalyst particles are added to the aforementioned aqueous solution; a step in which the aqueous solution is exposed to light having a wavelength of 200-400 nm while the catalyst particles are agitated within the aqueous solution, thereby oxidizing trivalent arsenic; and a step in which the agitation is stopped and the catalyst particles are separated out from the aqueous solution via precipitation. The catalyst particles consist of titanium-dioxide particles and zeolite particles. The titanium-dioxide particles are adsorbed to the outer surfaces of the zeolite particles. The molar ratio of silica to alumina in the zeolite is greater than or equal to 10:1, and the concentration of the catalyst particles in the aqueous solution is 0.4-16 g/L. |
