One-Dimensional Silver Tungstate Nanoparticles Photocatalytic Study

Silver tungstate is a new type of semiconductor photocatalytic material. The preparation and properties of silver tungstate have gradually become a hot spot in the field of photocatalysis.

Early research on silver tungstate mainly focused on the preparation and characterization of micron particles, micron short rods and nano short rods. With the deepening of research, a variety of novel one-dimensional nanomaterials such as nanotubes, nanorods, nanowires and nanosheets have been developed one after another. The singular properties of these specific Nanomorphologies have attracted wide attention in the field of photocatalysis.

On the basis of hydrothermal synthesis, the preparation of one-dimensional nano-silver tungstate materials requires the control of temperature, time, reaction precursor, pH and other conditions. The specific steps are as follows:

Step 1: While stirring, add 50 ml silver nitrate solution with 0.01M concentration to 0.005M sodium tungstate solution drop by drop. The molar ratio of sodium tungstate in sodium tungstate solution to silver nitrate solution is 1:2, and then dilute nitric acid (mass percentage concentration is 2%) is adjusted to pH value of 2.5.

Step 2, then placed in the reactor lined with polytetrafluoroethylene, the hydrothermal synthesis reaction was carried out at a set temperature of 150 ℃ for 12 hours.

Step 3. Cooling after hydrothermal reaction, opening the reactor, removing the supernatant from the tank of the reactor, taking sediments, cleaning, and vacuum drying at 60 ℃ for 2 hours, silver tungstate nanowires were obtained. The final morphology of silver tungstate nanowires was obtained.

Catalytic properties of silver tungstate nanowires under ultraviolet irradiation were investigated. Under ultraviolet irradiation, photocatalytic degradation of methylene blue solution at 10 mg/L was over 95% in 40 minutes. The photocatalytic degradation efficiency of silver tungstate microcrystals grown without pH adjustment of precursor solution for methylene blue solution was only about 60% in 40 minutes. It can be seen that the specific surface area of silver tungstate nanowires is large, and the photocatalytic efficiency of silver tungstate nanowires is 58.3% higher than that of silver tungstate microcrystals.

• < Prev
• Next >