2.2.3. Photocatalytic activity test
Photocatalytic reactions were performed in the photoreactor (Fig. 1) fabricated from a 5-L cylindrical borosilicate glass of 3 mm thick with the working volume of 4.5 L. The reactor was irradiated with three 15 W black-light bulbs. Black-light bulbs, i.e. UV-A bulbs, were selected as the light source in this study as they are less hazardous and produce less heat in comparison with the mercury and xenon lamps. In addition, the stoichiometric requirements for formate are reported for both TiO2 and Ag–TiO2 thin films. After filling the reactor with the synthetic solutions, the average UV light intensity in the photoreactor was 125 μW/m2. The light intensity was measured by UV-light meter (Model UV-340) at the center of the rector. The top and the bottom parts of the reactor were made of acrylic. Inside the reactor, twelve coated stainless steel sheets were mounted at three locations, with four sheets at each location, along the shaft that was powered by a motor (Fig. 1). The coated stainless steel sheets acted as the photocatalyst surfaces as well as mixing paddles. Throughout the experiment, the motor velocity was maintained at 60 rpm. The top cover contained two gas valves and two sampling ports. The first gas valve was used to feed nitrogen gas to displace oxygen while the second gas valve was used to release gases out of the reactor. The water samples were collected from the two sampling ports that withdraw water from two different depths. The analytical results of the water samples from both levels were averaged and used as the representative results of the entire reactor.
2.2.3 การทดสอบกิจกรรมกระPhotocatalytic reactions were performed in the photoreactor (Fig. 1) fabricated from a 5-L cylindrical borosilicate glass of 3 mm thick with the working volume of 4.5 L. The reactor was irradiated with three 15 W black-light bulbs. Black-light bulbs, i.e. UV-A bulbs, were selected as the light source in this study as they are less hazardous and produce less heat in comparison with the mercury and xenon lamps. In addition, the stoichiometric requirements for formate are reported for both TiO2 and Ag–TiO2 thin films. After filling the reactor with the synthetic solutions, the average UV light intensity in the photoreactor was 125 μW/m2. The light intensity was measured by UV-light meter (Model UV-340) at the center of the rector. The top and the bottom parts of the reactor were made of acrylic. Inside the reactor, twelve coated stainless steel sheets were mounted at three locations, with four sheets at each location, along the shaft that was powered by a motor (Fig. 1). The coated stainless steel sheets acted as the photocatalyst surfaces as well as mixing paddles. Throughout the experiment, the motor velocity was maintained at 60 rpm. The top cover contained two gas valves and two sampling ports. The first gas valve was used to feed nitrogen gas to displace oxygen while the second gas valve was used to release gases out of the reactor. The water samples were collected from the two sampling ports that withdraw water from two different depths. The analytical results of the water samples from both levels were averaged and used as the representative results of the entire reactor.
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