continuatively stirred for
240 min. After that, the mixture solutions were transferred
into the autoclave with 20 mL ethanol in it; at the same time,
TiO2 substrates were added into the reaction systems. Finally,
the reaction systems were kept at 120 1C for 24 h. After
reaction, the autolave cooled down naturally to room temperature,
following by washing with deionized water and
ethanol for 3 times to move ions that possibly remained at the
final products, and then dried at 60 1C for 2 h. The product
obtained with this procedure was called S2. The same
preparation method with S2 using glass instead of TiO2
substrate labeled S0. The procedure continued in the same
way with S2 as the sodium tungstate concentrations changed
from 0.001 M, 0.016 M to 0.024 M labeled S1, S3 and S4.
continuatively stirred for240 min. After that, the mixture solutions were transferredinto the autoclave with 20 mL ethanol in it; at the same time,TiO2 substrates were added into the reaction systems. Finally,the reaction systems were kept at 120 1C for 24 h. Afterreaction, the autolave cooled down naturally to room temperature,following by washing with deionized water andethanol for 3 times to move ions that possibly remained at thefinal products, and then dried at 60 1C for 2 h. The productobtained with this procedure was called S2. The samepreparation method with S2 using glass instead of TiO2substrate labeled S0. The procedure continued in the sameway with S2 as the sodium tungstate concentrations changedfrom 0.001 M, 0.016 M to 0.024 M labeled S1, S3 and S4.
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