Abstract
AbstractUltrafine SnO2 nanocrystals are synthesized through a surfactant‐assisted solvothermal route in water–ethanol mixed media. SnO2 photocatalysts with sizes of about 4, 8, and 12 nm are prepared through controllable annealing of the as‐synthesized nanocrystals. Brunauer–Emmett–Teller (BET) specific surface areas of calcined SnO2 samples increase dramatically as their sizes decrease. Photocatalytic performances of the as‐obtained catalysts for decomposing ppb‐level (parts per billion) acetaldehyde are tested in a continuous glass‐plate reactor. Result shows that SnO2 photocatalysts of about 4 nm with a large BET surface area of 130 m2 g−1 exhibit the best photocatalytic oxidation properties, which is comparable to that of Degussa P25 TiO2. Analysis by using the unimolecular Langmuir–Hinshelwood reaction model indicates that the abilities of adsorption have well synergized with the photocatalytic reaction activities in the as‐obtained SnO2 samples. This synergism finally enhances the photocatalytic performance of the as‐prepared SnO2 photocatalysts.
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